A continuous series operation and circulating saturated ion exchange system

Abstract

The present invention discloses a continuous series operation and circulating saturated ion exchange system. The present invention realizes regeneration after the resin is fully saturated by setting up a series continuous operation of exchange columns and a countercurrent circulation saturation system. At the same time, through the design of multiple pipelines and multiple valves, the resin columns can form a series continuous operation with each other, so that uninterrupted separation, regeneration, cleaning and other operations can be achieved. The automatic operation and control of the system can be achieved through the design of multiple online detection devices. The present invention can be used for surface treatment such as electroplating, metallurgy, electronics, new energy, new materials, chemical industry, pharmaceuticals and other industrial fields. The present invention can achieve the separation, recovery, enrichment, purification, etc. of metal ions and other substances. While realizing the separation and enrichment of target objects by ion exchange method and obtaining high-purity and high-content target solution, it can also ensure the recovery rate or removal rate of the target object and the automatic and continuous operation of the system.

Description

Technical Field

[0001] The invention belongs to the technical field, and particularly relates to a continuous series operation and circulating saturated ion exchange system. Background Art

[0002] Ion exchange resin technology is widely used in industrial wastewater treatment, metallurgy, chemical industry, metal processing, electronics, electricity, food, pharmaceutical and other industries. Ion exchange is often used to deeply remove pollutants or recycle pollutants in industrial wastewater treatment, enrich and recycle resources in metallurgy and other industries, or remove impurities and purify liquid. However, in the process of continuous ion exchange, how to make the resin adsorb the target object to full saturation and then regenerate, while making the target object be recovered or removed as much as possible, and when using ion exchange to remove impurities and purify liquid, while removing impurities as cleanly as possible, it is an urgent problem to ensure that the content of the target object in the liquid remains unchanged and reduce the loss of the liquid.

[0003] In order to avoid premature breakthrough, traditional fixed bed ion exchange systems generally adopt the method of downstream operation. However, when the aqueous solution passes through the resin bed in the exchange column, due to the formation of channel flow, wall effect and dead corners in the resin bed, the target object begins to break through when the adsorption layer reaches more than 50%. Even if the target object breaks through 100%, it is difficult for the resin to fully saturate with the target object. Therefore, it is difficult to obtain a regeneration solution with a high content and high purity of the target object. In addition, there is a lack of precise control means during the resin regeneration and cleaning process, and it is also difficult to obtain a regeneration solution with a high content and high purity.

[0004] The saturation of the resin will affect the content of the target in the regeneration liquid, that is, the higher the saturation of the resin, the higher the content of the target in the obtained regeneration liquid. For the selective adsorption of the target, the higher the saturation of the resin, the fewer impurity ions in the obtained regeneration liquid, which is beneficial to improve the purity of the target. Therefore, when the present invention is used to recover the target in water, a regeneration liquid with a high content and high purity of the target can be obtained, and the recovery rate of the target can be improved. At the same time, the utilization rate of the resin is also improved. When the present invention is used to purify the target solution, impurities can be deeply removed without reducing or reducing the content of the target in the solution as little as possible.

[0005] The information disclosed in this background technology section is only intended to enhance the understanding of the overall background of the invention and should not be regarded as an acknowledgment or any form of suggestion that the information constitutes the prior art already known to a person skilled in the art. Summary of the invention

[0006] The object of the present invention is to provide a continuous series operation and circulating saturated ion exchange system to overcome the above-mentioned defects in the prior art.

[0007] To achieve the above objectives, 1. A continuous series operation and circulating saturated ion exchange system (see attached Figure 1 ), which is mainly composed of a raw water tank, two groups of pumps, a TI-T6 online detector, the 1st valve to the 33rd valve and three ion exchange columns (containing ion exchange resin, hereinafter referred to as resin) connected by pipelines, and is characterized in that: the raw water tank is connected to the upper part of the ion exchange first column (hereinafter referred to as the first column) through the 1st pump, the T1 online detector (hereinafter referred to as T1), the pipeline, the 1st valve and the 1st upper pipe, the bottom of the 1st column is connected to the upper part of the ion exchange second column (hereinafter referred to as the second column) through the 1st lower pipe, the 2nd valve, the T2 online detector (hereinafter referred to as T2), the pipeline, the 11th valve and the 2nd upper pipe, and the bottom of the 2nd column is connected to the post-exchange water treatment system through the 2nd lower pipe, the 6th valve, the T4 online detector (hereinafter referred to as T4) and the pipeline;

[0008] The raw water pool is connected to the upper part of the second column through the first pump, T1, pipeline, the fourth valve and the second upper pipe; the bottom of the second column is connected to the upper part of the third ion exchange column (hereinafter referred to as the third column) through the second lower pipe, the fifth valve, T2, pipeline, the twelfth valve and the third upper pipe, and the bottom of the third column is connected to the post-exchange water treatment system through the third lower pipe, the ninth valve, T4 and pipeline;

[0009] The raw water tank is connected to the upper part of the third column through the first pump, T1, pipeline, the seventh valve and the third upper pipe; the bottom of the third column is connected to the upper part of the first column through the third lower pipe, the eighth valve, T2, pipeline, the tenth valve and the first upper pipe, and the bottom of the first column is connected to the post-delivery water treatment system through the first lower pipe, valve 3, T4 and pipeline;

[0010] The raw water tank is connected to the bottom of the first column through pump 2, pipeline, valve 14 and the first lower pipe, and the upper part of the first column is connected to the raw water tank through the first upper pipe, valve 13, T3 and pipeline;

[0011] The raw water tank is connected to the bottom of the second column through pump 2, pipeline, valve 16 and the second lower connecting pipe, and the upper part of the second column is connected to the raw water tank through the second upper connecting pipe, valve 15, T3 and pipeline;

[0012] The raw water tank is connected to the bottom of the third column through pump 2, pipelines, the 18th valve and the 3rd lower connecting pipe, and the upper part of the third column is connected to the raw water tank through the 3rd upper connecting pipe, the 17th valve, T3 and pipelines.

[0013] The regeneration agent, transformation agent or countercurrent column washing water is connected to the first column through the pipeline, the 20th valve and the first lower pipe, the downstream column washing water is connected to the first column through the pipeline, the 19th valve and the first upper pipe, the resin regeneration liquid (referred to as the regeneration liquid, the same below) passes through the first upper pipe, the 21st valve, the pipeline and the T6 de-regeneration liquid treatment system, the resin transformation liquid (referred to as the transformation liquid, the same below) and the countercurrent column washing wastewater pass through the first upper pipe, the 23rd valve, the pipeline and the T5 de-washing column wastewater treatment system, and the downstream column washing wastewater passes through the first lower pipe, the 22nd valve, the pipeline and the T5 de-washing column wastewater treatment system;

[0014] The regeneration agent, transformation agent or countercurrent column washing water is connected to the second column through the pipeline, the 25th valve and the second lower connecting pipe, the downstream column washing water is connected to the second column through the pipeline, the 24th valve and the second upper connecting pipe, the resin regeneration liquid passes through the second upper connecting pipe, the 26th valve, the pipeline and the T6 de-regeneration liquid treatment system, the resin transformation liquid and the countercurrent column washing wastewater pass through the second upper connecting pipe, the 28th valve, the pipeline and the T5 de-washing column wastewater treatment system, and the downstream column washing wastewater passes through the second lower connecting pipe, the 27th valve, the pipeline and the T5 de-washing column wastewater treatment system;

[0015] The regeneration agent, transformation agent or countercurrent column washing water is connected to the third column through the pipeline, the 30th valve and the 3rd lower connecting pipe, the downstream column washing water is connected to the third column through the pipeline, the 29th valve and the 3rd upper connecting pipe, the resin regeneration liquid passes through the 3rd upper connecting pipe, the 31st valve, the pipeline and the T6 regeneration liquid treatment system, the resin transformation liquid and countercurrent column washing wastewater pass through the 3rd upper connecting pipe, the 33rd valve, the pipeline and the T5 column washing wastewater treatment system, and the downstream column washing wastewater passes through the 3rd lower connecting pipe, the 32nd valve, the pipeline and the T5 column washing wastewater treatment system.

[0016] Further, the pipeline connecting the 1st valve, the 10th valve, the 13th valve, the 19th valve, the 21st valve and the 23rd valve to the upper part of the 1st column is the 1st upper connecting pipe, and the pipeline connecting the 2nd valve, the 3rd valve, the 14th valve, the 20th valve and the 22nd valve to the bottom of the 1st column is the 1st lower connecting pipe;

[0017] The pipeline connecting the 4th valve, the 11th valve, the 15th valve, the 24th valve, the 26th valve and the 28th valve to the upper part of the second column is the second upper connecting pipe, and the pipeline connecting the 5th valve, the 6th valve, the 16th valve, the 25th valve and the 27th valve to the bottom of the second column is the second lower connecting pipe;

[0018] The pipeline connecting the 7th valve, the 12th valve, the 17th valve, the 29th valve, the 31st valve and the 33rd valve to the upper part of the 3rd column is the 3rd upper connecting pipe, and the pipeline connecting the 8th valve, the 9th valve, the 18th valve, the 30th valve and the 32nd valve to the bottom of the 3rd column is the 3rd lower connecting pipe;

[0019] Further, the raw water in the raw water pool enters the upper part of the first column through the first pump, pipeline, T1, the first valve and the first upper pipe; enters the upper part of the second column through the resin layer in the first column, the first lower pipe connected to the bottom of the first column, the second valve, T2, pipeline, the 11th valve and the upper pipe 2, and then passes through the resin layer in the second column, the second lower pipe connected to the bottom of the second column, the sixth valve, T4 and the pipeline to be discharged to the post-handling water treatment system;

[0020] The raw water in the raw water pool enters the upper part of the second column through the first pump, pipeline, T1, the fourth valve and the second upper pipe, passes through the resin layer in the second column, and enters the upper part of the third column through the second lower pipe connected to the bottom of the second column, the fifth valve, T2, pipeline, the twelfth valve and the third upper pipe, and then passes through the resin layer in the third column, and is discharged to the post-handling water treatment system through the third lower pipe connected to the bottom of the third column, the ninth valve, T4 and pipeline;

[0021] The raw water in the raw water pool enters the upper part of the third column through the first pump, pipeline, T1, the seventh valve and the third upper pipe, passes through the resin layer in the third column, and enters the upper part of the first column through the third lower pipe connected to the bottom of the third column, the eighth valve, T2, pipeline, the tenth valve and the first upper pipe, and then passes through the resin layer in the first column, and is discharged to the post-handling water treatment system through the first lower pipe connected to the bottom of the first column, the third valve, T4 and pipeline;

[0022] The raw water from the raw water pool enters the bottom of the first column through pump 2, pipeline, valve 14 and the first lower pipe, passes through the resin layer in the first column, and enters the raw water pool through the first upper pipe, valve 13, T3 and pipeline;

[0023] The raw water from the raw water pool enters the bottom of the second column through pump 2, pipeline, valve 16 and the second lower pipe, passes through the resin layer in the second column, and enters the raw water pool through the second upper pipe, valve 15, T3 and pipeline;

[0024] The raw water from the raw water pool enters the bottom of the third column through pump 2, pipeline, the 18th valve and the 3rd lower connecting pipe, passes through the resin layer in the 3rd column, and enters the raw water pool through the 3rd upper connecting pipe, the 17th valve, T3 and the pipeline.

[0025] The regeneration agent enters the first column through the pipeline, the 20th valve and the 1st lower pipe, and the resin regeneration liquid passes through the 1st upper pipe, the 21st valve, the pipeline and the T6 de-regeneration liquid treatment system; the transformation agent enters the first column through the pipeline, the 20th valve and the 1st lower pipe, and the resin transformation liquid passes through the 1st upper pipe, the 23rd valve, the pipeline and the T5 de-washing column wastewater treatment system; the countercurrent column washing water enters the first column through the pipeline, the 20th valve and the 1st lower pipe, and the countercurrent column washing wastewater passes through the 1st upper pipe, the 23rd valve, the pipeline and the T5 de-washing column wastewater treatment system; the downstream column washing water enters the first column through the pipeline, the 19th valve and the 1st upper pipe, and the downstream column washing wastewater passes through the 1st lower pipe, the 22nd valve, the pipeline and the T5 de-washing column wastewater treatment system;

[0026] The regeneration agent enters the second column through the pipeline, the 25th valve and the 2nd lower pipe, and the resin regeneration liquid passes through the 2nd upper pipe, the 26th valve, the pipeline and the T6 de-regeneration liquid treatment system; the transformation agent enters the second column through the pipeline, the 25th valve and the 2nd lower pipe, and the resin transformation liquid passes through the 2nd upper pipe, the 28th valve, the pipeline and the T5 de-washing column wastewater treatment system; the countercurrent column washing water enters the second column through the pipeline, the 25th valve and the 2nd lower pipe, and the countercurrent column washing wastewater passes through the 2nd upper pipe, the 28th valve, the pipeline and the T5 de-washing column wastewater treatment system; the downstream column washing water enters the second column through the pipeline, the 24th valve and the 2nd upper pipe, and the downstream column washing wastewater passes through the 2nd lower pipe, the 27th valve, the pipeline and the T5 de-washing column wastewater treatment system;

[0027] The regeneration agent enters the third column through the pipeline, the 30th valve and the 3rd lower connecting pipe, and the resin regeneration liquid passes through the 3rd upper connecting pipe, the 31st valve, the pipeline and the T6 regeneration liquid treatment system; the transformation agent enters the third column through the pipeline, the 30th valve and the 3rd lower connecting pipe, and the resin transformation liquid passes through the 3rd upper connecting pipe, the 33rd valve, the pipeline and the T5 de-washing column wastewater treatment system; the countercurrent column washing water enters the third column through the pipeline, the 30th valve and the 3rd lower connecting pipe, and the countercurrent column washing wastewater passes through the 3rd upper connecting pipe, the 33rd valve, the pipeline and the T5 de-washing column wastewater treatment system; the downstream column washing water enters the third column through the pipeline, the 29th valve and the 3rd upper connecting pipe, and the downstream column washing wastewater passes through the 3rd lower connecting pipe, the 32nd valve, the pipeline and the T5 de-washing column wastewater treatment system.

[0028] 4. The continuous series operation and circulating saturated ion exchange system according to claim 1 is characterized in that the system consists of four subsystems: (1) a double-column alternating series continuous operation system consisting of the first pump, the first valve to the ninth valve and corresponding pipelines; (2) an online detection system consisting of online detectors T1 to T6, the tenth valve to the twelfth valve and corresponding pipelines; (3) a countercurrent circulation saturation system consisting of the second pump, the thirteenth valve to the eighteenth valve and corresponding pipelines; (4) a resin regeneration and cleaning system consisting of the nineteenth valve to the thirty-third valve and corresponding pipelines.

[0029] A continuous series operation and circulating saturated ion exchange system, wherein the first column, the second column and the third column are equipped with different resins according to the different target substances contained in the raw water to be recovered or removed, and the operation principle and steps are as follows:

[0030] (1) Step 1 starts operation: the first pump starts, the first valve, the second valve, the eleventh valve, and the sixth valve are opened, and the raw water from the raw water pool enters the first column at a set flow rate through the first pump, T1, the first valve, and the first upper pipe, and then passes through the resin layer in the first column, and then enters the second column through the first lower pipe, the second valve, T2, the eleventh valve, and the second upper pipe; after passing through the resin layer of the second column, it is discharged through the second lower pipe, the sixth valve, and T4 to become the post-transfer water to the post-transfer water treatment system. At this time, the system is a series of columns 1 and 2 running downstream.

[0031] The target substances in the raw water (including but not limited to metal ions, inorganic and organic ions, metal complexes, etc., and the target substances can be one or more) are first adsorbed by the resin in the first column. The target substances that are not completely adsorbed by the resin in the first column or the target substances that leak out of the first column are continuously adsorbed by the resin in the second column to ensure that the content of the target substances in the water after delivery does not exceed the set value, and to ensure its recovery or removal rate. During operation, the target substance content in the raw water is first detected by the online detector T1 (referred to as T1). After the raw water passes through the first column, the target substance content in the raw water is detected by the online monitor T2 (referred to as T2) and then enters the second column. As more and more target substances are adsorbed by the resin in the first column, its saturation gradually increases, and the target substances that are not adsorbed or leaked out of the raw water also gradually increase. Therefore, the detection value C of T2 2 Rising and gradually approaching T1 detection value C 1 , when C 2 / C 1 or (C 1 -C 2 ) / C 1 The ratio reaches the set value M 1 (M 1 The value is between 0-1 or 1-0) indicating that the resin in the first column is close to saturation, M 1 The setting of the value needs to be determined based on the target content in the raw water, the time required for resin cycle saturation, the time required for resin regeneration and cleaning, etc. The online detection and control principles for the series operation of the second and third columns, and the third and first columns in the subsequent steps are the same;

[0032] (2) Step 2 Series Column Switching 1: When the first column and the second column in step 1 are running in series until M 1 When the value reaches the set value, it indicates that the target substance in the raw water adsorbed by the resin in the first column is close to saturation. The first valve, the second valve, the eleventh valve and the sixth valve are closed, and the fourth valve, the fifth valve, the twelfth valve and the ninth valve are opened. The raw water enters the second column through the first pump, T1, the fourth valve and the second upper pipe, passes through the resin layer in the second column, enters the third column through the second lower pipe, the fifth valve, T2, the twelfth valve and the third upper pipe, and then passes through the resin layer of the third column and is discharged to the after-handling water treatment system through the third lower pipe, the ninth valve and T4. At this time, the system switches to the second column and the third column in series and downstream operation.

[0033] (3) Step 3: Countercurrent circulation saturation of the resin in the first column: When the first valve, the second valve, the eleventh valve and the sixth valve are closed in step 2, the second pump is started, the thirteenth valve and the fourteenth valve are opened, and the raw water passes through the fourteenth valve at a set flow rate, enters the first column through the first lower pipe, and then returns to the raw water pool from the first upper pipe, the thirteenth valve and T3. After the target content in the water is detected by T3, it is tested and returned to the raw water pool for countercurrent circulation, so that the resin in the first column that is close to saturation is completely saturated. In this process, the target will completely replace other non-target adsorbents adsorbed on the resin, creating conditions for the subsequent regeneration of the resin to obtain a high-purity target. In addition, due to the complete saturation of the resin, the resin utilization rate reaches the maximum, which prolongs the regeneration cycle of the resin and reduces the operating cost. In the countercurrent saturation process, as the degree of resin saturation increases, the detection value C of T3 increases. 3 Gradually increasing, when C 3 / C 1 or (C 1 -C 2 ) / C 1 The ratio reaches the specified value M 2 (M 2 value is between 0.1-1.0 or 0.9-0), when M 2 When the value reaches the set value, it indicates that the resin is fully saturated, the cycle ends, the second pump stops, and the 14th valve is closed; the countercurrent circulation and detection control principles of the second column and the third column in the subsequent steps are the same;

[0034] (4) Step 4: Recovery of raw water in the first column and cleaning of the resin before regeneration: a) If it is necessary to control the content of the components in the raw water, in step 3, while closing valve 14, valve 20 is opened, and the column washing water enters the first column through valve 20 and the first lower connection pipe at a set flow rate. The raw water in the first column is pushed out by the column washing water and returned to the raw water tank for recovery through the first upper connection pipe, valve 13 and T3. When the column washing water inflow reaches the set amount, the raw water in the first column is completely pushed out by the column washing water, valve 13 is closed, valve 23 is opened, and the column washing water continues to countercurrently wash the resin. The column washing wastewater is discharged into the column washing wastewater through the first upper connection pipe, valve 23 and T5. Water treatment system, when the column washing water inflow reaches the set amount, stop feeding the column washing water, and the resin in the first column is thoroughly cleaned before starting the next regeneration; b) If there is no need to control the content of the components in the raw water, in step 3, while closing the 14th valve, the 20th valve is opened, and the column washing water enters the first column through the 20th valve and the first lower connecting pipe at a set flow rate to clean the resin in the first column, and the column washing waste water returns to the raw water pool through the first upper connecting pipe, the 13th valve and T3. When the column washing water inflow reaches the set amount, stop feeding the column washing water, the 13th valve is closed, and the resin in the first column is thoroughly cleaned before starting the next regeneration.

[0035] (5) Step 5: Resin regeneration in the first column: a) If it is necessary to control the target substance content in the regeneration liquid, the 23rd valve is opened, and the quantitative regeneration agent enters the first column through the 20th valve and the first lower pipe at a set flow rate to regenerate the resin in the first column. The wash water in the first column is pushed out by the regeneration liquid through the first upper pipe, the 23rd valve and T5 and is detected by T5 before being sent to the wash water treatment system. When the detection value of T5 reaches the set value, it means that the wash water in the first column has been completely pushed out by the regeneration liquid. The 23rd valve is closed, the 21st valve is opened, and the regeneration liquid in the first column is sent to the regeneration liquid treatment system from the first upper pipe, the 21st valve and T6; b) If it is not necessary to control the target substance content in the regeneration liquid, the 21st valve is opened, and the quantitative regeneration agent enters the first column through the 20th valve and the first lower pipe at a set flow rate to regenerate the resin in the first column. The regeneration liquid in the first column is sent to the regeneration liquid treatment system from the first upper pipe, the 21st valve and T6;

[0036] When the regeneration agent entering the first column reaches the set amount, stop feeding the regeneration agent, and the column washing water enters the first column again through the 20th valve and the first lower pipe, and pushes the regeneration liquid in the first column out from the first upper pipe, the 21st valve and T6, and is discharged into the regeneration liquid treatment system after being detected by T6. As the column washing water continuously pushes the regeneration liquid in the first column out, the T6 detection value keeps changing. When the T6 detection value reaches the set value, it indicates that the regeneration liquid has been completely pushed out by the column washing water. The 21st valve is closed, the 23rd valve is opened, and the column washing wastewater is sent to the column washing wastewater treatment system through the first upper pipe, the 23rd valve and T5, and the tree continues to be cleaned. The resin is washed in the countercurrent mode. When the column washing water inflow reaches the set amount, the 20th valve and the 23rd valve are closed, the 19th valve and the 22nd valve are opened, and the column washing water enters the first column through the 19th valve and the upper pipe, and then passes through the first lower pipe, the 22nd valve and T5 and is detected by T5 before going to the column washing wastewater treatment system to wash the resin in the downstream mode. When the detection value of T5 reaches the set value, the resin washing in the first column is completed, the column washing water stops inflowing, the 19th valve and the 22nd valve are closed, and the resin regeneration and washing are completed; the detection and control principles of the resin regeneration and washing in the second and third columns in the subsequent steps are the same;

[0037] (6) Step 6: Resin transformation in the first column: When the 19th and 22nd valves in step 5 are closed, the 20th and 23rd valves are opened, and the quantitative transformation agent enters the first column through the 20th valve and the first lower pipe at a set flow rate to transform the resin in the first column. The transformation liquid passes through the first upper pipe, the 23rd valve and T5 to the column washing wastewater treatment system. After the transformation agent enters the first column to reach the set amount, the transformation agent is stopped, and the column washing water enters the first column through the 20th valve and the first lower pipe, and then passes through the first upper pipe, the 23rd valve and T5 to the column washing wastewater treatment system to countercurrently wash the resin. When the column washing water inflow reaches the set amount, the 20th valve is stopped. The valve and the 23rd valve are closed, the 19th valve and the 22nd valve are opened, the column washing water enters the first column through the 19th valve and the upper pipe, and then passes through the first lower pipe, the 22nd valve and T5 and is detected by T5 before going to the column washing wastewater treatment system to wash the resin downstream. When the detection value of T5 reaches the set value, the resin in the first column is washed, the column washing water stops entering, the 19th valve and the 22nd valve are closed, and the resin transformation and cleaning are completed. This step can be omitted for resins that do not require transformation; after the resin regeneration, transformation and cleaning are completed, the first column waits for the next switch; the detection and control principles of the transformation and cleaning of the second and third columns in the subsequent steps are the same;

[0038] (7) Step 7 Series column switching 2: When the second column and the third column in step 2 are running in series to M 1 When the value reaches the set value, it indicates that the resin in the second column is close to saturation in adsorbing the target substance in the raw water. The 4th, 5th, 12th and 9th valves are closed, and the 7th, 8th, 10th and 3rd valves are opened. The raw water enters the 3rd column through the 1st pump, T1, the 7th valve and the 3rd upper pipe, passes through the resin layer in the 3rd column, enters the 1st column through the 3rd lower pipe, the 8th valve, T2, the 10th valve and the 1st upper pipe, passes through the resin layer of the 1st column, and is discharged to the after-handling water treatment system through the 1st lower pipe, the 3rd valve and T4. At this time, the system switches to the 3rd column and the 1st column in series and downstream operation.

[0039] (8) Step 8: Resin countercurrent circulation saturation in the second column: When the 4th, 6th, 12th and 9th valves are closed in step 7, pump 2 is started, valves 15 and 16 are opened, and raw water enters the second column through valve 16 and the second lower pipe, and then enters the raw water tank from the second upper pipe, valve 15 and T3, and after the target content in the water is detected by T3, it is saturated with countercurrent circulation. When M 2 When the value reaches the set value, the resin in the second column is completely saturated, the cycle ends, pump 2 stops, and valve 16 closes;

[0040] (9) Step 9: Recovery of raw water in the second column and cleaning of the resin before regeneration: a) If it is necessary to control the content of the components in the raw water, in step 8, while closing valve 16, valve 25 is opened, and the wash water enters the second column through valve 25 and the second lower connection pipe, the raw water in the second column is pushed out by the wash water and returned to the raw water tank for recovery through the second upper connection pipe, valve 15 and T3. When the wash water inflow reaches the set amount, the raw water in the second column has been completely pushed out by the wash water, valve 15 is closed, valve 28 is opened, and the wash water continues to countercurrently clean the resin. The wash waste water is discharged into the wash column through the second upper connection pipe, valve 28 and T5. Wastewater treatment system, when the column washing water inflow reaches the set amount, stop the column washing water inflow, and start the next regeneration after the resin in the second column is thoroughly cleaned; b) If it is not necessary to control the content of the components in the raw water, when the 16th valve is closed in step 8, the 25th valve is opened, and the column washing water enters the second column through the 25th valve and the second lower pipe to clean the resin in the second column, and the column washing wastewater returns to the raw water tank through the second upper pipe, the 15th valve and T3. When the column washing water inflow reaches the set amount, stop the column washing water inflow, the 15th valve is closed, and the resin in the second column is thoroughly cleaned before starting the next regeneration;

[0041] (10) Step 10 Regeneration of resin in the second column: a) If it is necessary to control the content of the target substance in the regeneration liquid, the 28th valve is opened, and the quantitative regeneration agent enters the second column through the 25th valve and the second lower pipe at a set flow rate to regenerate the resin in the second column. The regeneration liquid pushes out the wash water in the second column and passes through the second upper pipe, the 28th valve and T5 to the wash water treatment system. When the detection value of T5 reaches the set value, the wash water in the second column has been completely pushed out by the regeneration liquid, the 28th valve is closed, the 26th valve is opened, and the regeneration liquid in the second column passes through the second upper pipe, the 26th valve and T6 to the regeneration liquid treatment system; b) If it is not necessary to control the content of the target substance in the regeneration liquid, the 26th valve is opened, and the quantitative regeneration agent enters the second column through the 25th valve and the second lower pipe at a set flow rate to regenerate the resin in the second column. The regeneration liquid in the second column passes through the second upper pipe, the 26th valve and T6 to the regeneration liquid treatment system;

[0042] When the regeneration agent entering the second column reaches the set amount, stop feeding the regeneration agent, and the column washing water enters the second column again through the 25th valve and the second lower pipe, and the regeneration liquid in the second column is pushed into the regeneration liquid treatment system through the second upper pipe, the 26th valve and T6. When the detection value of T6 reaches the set value, the 26th valve is closed, the 28th valve is opened, and the column washing wastewater is sent to the column washing wastewater treatment system through the second upper pipe, the 28th valve and T5. When the column washing water inflow reaches the set amount, the 25th valve and the 28th valve are closed, the 24th valve and the 27th valve are opened, and the column washing water enters the second column through the 24th valve and the second upper pipe, and then goes to the column washing wastewater treatment system through the second lower pipe, the 27th valve and T5. When the detection value of T5 reaches the set value, the column washing water stops inflowing, the 24th valve and the 27th valve are closed, and the resin regeneration and cleaning are completed;

[0043] (11) Step 11: Resin transformation in the second column: In step 10, valves 24 and 27 are closed, valves 25 and 28 are opened, and a quantitative transformation agent enters the second column through valve 25 and the second lower connection pipe at a set flow rate to transform the resin in the second column. The transformation liquid passes through the second upper connection pipe, valve 28 and T5 to the column washing wastewater treatment system. After the transformation agent enters the second column and reaches the set amount, the transformation agent is stopped, and the column washing water enters the second column through valve 25 and the second lower connection pipe, and then passes through the second upper connection pipe, valve 28 and T5 to the column washing wastewater treatment system. Valve and T5 to the column washing wastewater treatment system. When the column washing water inflow reaches the set amount, the 25th valve and the 28th valve are closed, the 24th valve and the 27th valve are opened, and the column washing wastewater enters the second column through the 24th valve and the second upper connecting pipe, and then passes through the second lower connecting pipe, the 27th valve and T5 to the column washing wastewater treatment system. When the detection value of T5 reaches the set value, the column washing water stops inflow, the 24th valve and the 27th valve are closed, and the resin transformation and cleaning are completed; after the resin regeneration, transformation and cleaning are completed, the second column waits for the next switch.

[0044] (12) Step 12 Series column switching 3: When the third column and the first column in step 7 are running in series to M 1 When the value reaches the set value, it indicates that the resin in the third column is close to saturation in adsorbing the target substance in the raw water. Close the seventh valve, the eighth valve, the tenth valve and the valve 3, and switch to the first column and the second column in series and downstream operation according to step 1;

[0045] (13) Step 13: Resin countercurrent circulation saturation in the third column: When the 7th, 8th, 10th and 3rd valves are closed in step 12, pump 2 is started, valves 17 and 18 are opened, and raw water enters the third column through valve 18 and the 3rd lower pipe, and then enters the raw water tank through the 3rd upper pipe, valve 17 and T3 and detects the target content in the water through T3, and performs countercurrent circulation. When M 2 When the value reaches the set value, the resin in the 3rd column is completely saturated, the cycle ends, pump 2 stops, and valve 18 closes;

[0046] (14) Step 14: Recovery of raw water in the third column and cleaning of resin before regeneration: a) If it is necessary to control the content of components in the raw water, in step 13, while closing valve 18, valve 30 is opened, column washing water begins to flow in, and enters the third column through valve 30 and the third lower pipe, and the raw water in the third column returns to the raw water tank through the third upper pipe, valve 17 and T3. When the column washing water inflow reaches the set amount, the raw water in the second column has been completely pushed out by the column washing water, valve 17 is closed, valve 33 is opened, and the column washing water continues to countercurrently wash the resin, and the column washing waste water is discharged into the column washing waste water through the third upper pipe, valve 33 and T5. Water treatment system, when the column washing water inflow reaches the set amount, stop the column washing water inflow, and start the next regeneration after the resin in the third column is thoroughly cleaned; b) If it is not necessary to control the content of the components in the raw water, when the 18th valve is closed in step 13, the 30th valve is opened, and the column washing water enters the third column through the 30th valve and the third lower pipe to clean the resin in the third column, and the column washing wastewater returns to the raw water tank through the third upper pipe, the 17th valve and T3. When the column washing water inflow reaches the set amount, stop the column washing water inflow, the 17th valve is closed, and the resin in the third column is thoroughly cleaned and start the next regeneration;

[0047] (15) Step 15: Regeneration of resin in the third column: a) If it is necessary to control the content of the target substance in the regeneration liquid, the 33rd valve is opened, and the quantitative regeneration agent enters the third column through the 30th valve and the 3rd lower pipe at a set flow rate, and the column washing water in the third column passes through the 3rd upper pipe, the 33rd valve and T5 to the column washing water treatment system. When the detection value of T5 reaches the set value, the 33rd valve is closed, the 31st valve is opened, and the regeneration liquid in the third column passes through the 3rd upper pipe, the 31st valve and T6 to the regeneration liquid treatment system; b) If it is not necessary to control the content of the target substance in the regeneration liquid, the 31st valve is opened, and the quantitative regeneration agent enters the third column through the 30th valve and the 3rd lower pipe at a set flow rate to regenerate the resin in the third column, and the regeneration liquid in the third column passes through the 3rd upper pipe, the 31st valve and T6 to the regeneration liquid treatment system;

[0048] When the regeneration agent entering the third column reaches the set amount, stop feeding the regeneration agent, and the column washing water enters the third column again through the 30th valve and the 3rd lower pipe, and the regeneration liquid in the third column is pushed into the regeneration liquid treatment system through the 3rd upper pipe, the 31st valve and T6. When the detection value of T6 reaches the set value, the 31st valve is closed, the 33rd valve is opened, and the column washing wastewater goes to the column washing wastewater treatment system through the 3rd upper pipe, the 33rd valve and T5. When the column washing water inflow reaches the set amount, the 30th valve and the 33rd valve are closed, the 29th valve and the 32nd valve are opened, and the column washing water enters the third column through the 29th valve and the 3rd upper pipe, and then goes to the column washing wastewater treatment system through the 3rd lower pipe, the 32nd valve and T5. When the detection value of T5 reaches the set value, the column washing water stops inflowing, the 29th valve and the 32nd valve are closed, and the resin regeneration and cleaning are completed;

[0049] (16) Step 16: Resin transformation in the third column: When the 29th and 32nd valves in step 15 are closed, the 30th and 33rd valves are opened, and the quantitative transformation agent enters the third column through the 30th valve and the third lower pipe at a set flow rate to transform the resin in the third column. The transformation liquid passes through the third upper pipe, the 33rd valve and T5 to the column washing wastewater treatment system. After the transformation agent enters the third column and reaches the set amount, the transformation agent is stopped, and the column washing water enters the third column through the 30th valve and the third lower pipe, and then passes through the third upper pipe, the 33rd valve and the T5 to the column washing wastewater treatment system. 3 valves and T5 to the column washing wastewater treatment system. When the column washing water inflow reaches the set amount, the 30th valve and the 33rd valve are closed, the 29th valve and the 32nd valve are opened, and the column washing wastewater enters the 3rd column through the 29th valve and the 3rd upper pipe, and then passes through the 3rd lower pipe, the 32nd valve and the T5 to the column washing wastewater treatment system. When the detection value of T5 exceeds the set value, the column washing water stops inflow, the 29th valve and the 32nd valve are closed, and the resin transformation and cleaning are completed; after the resin regeneration, transformation and cleaning are completed, the 3rd column waits for the next switch;

[0050] (17) Repeat steps 2-(16) to achieve continuous operation of the system;

[0051] (18) After the raw water is adsorbed by the series column to remove the target substance, the post-delivery water is tested by the online detector T4 and then discharged into the post-delivery treatment system. T4 is set to ensure that the content of the target substance in the post-delivery water does not exceed the set value. In general, it is tested online through T1 and T2, and according to the set M 1 The control of the value can ensure the normal and continuous operation of the system, but in abnormal conditions, including but not limited to water quality exceeding the normal range, M 1 If the value is set too high or too low, some resins fail or regenerate poorly, or the equipment fails, the T4 detection value will exceed the set value. Once the T4 value exceeds the standard, the resin column automatically switches to continue running. At the same time, the system needs to adjust the process parameters and operating procedures or troubleshoot the problem.

[0052] A continuous series operation and circulating saturated ion exchange system, mainly composed of a raw water tank, two groups of pumps, a TI-T6 online detector, a 1-31 valve and three ion exchange columns (filled with resin) connected by pipelines, characterized in that: the raw water tank is connected to the upper part of the first column through the first pump, T1, pipeline, the first valve and the first upper pipe, the bottom of the first column is connected to the upper part of the second column through the first lower pipe, the second valve, T2, pipeline, the 11th valve and the second upper pipe, and the bottom of the second column is connected to the post-exchange water treatment system through the second lower pipe, the sixth valve, T4 and the pipeline;

[0053] The raw water tank is connected to the upper part of the second column through the first pump, T1, pipeline, the fourth valve and the second upper pipe; the bottom of the second column is connected to the upper part of the third column through the second lower pipe, the fifth valve, T2, pipeline, the twelfth valve and the third upper pipe, and the bottom of the third column is connected to the post-delivery water treatment system through the third lower pipe, the ninth valve, T4 and pipeline;

[0054] The raw water tank is connected to the upper part of the third column through the first pump, T1, pipeline, the seventh valve and the third upper pipe; the bottom of the third column is connected to the upper part of the first column through the third lower pipe, the eighth valve, T2, pipeline, the tenth valve and the first upper pipe, and the bottom of the first column is connected to the post-delivery water treatment system through the first lower pipe, the third valve, T4 and pipeline;

[0055] The raw water tank is connected to the bottom of the first column through the second pump, pipeline, 14th valve and the first lower connecting pipe, and the upper part of the first column is connected to the raw water tank through the first upper connecting pipe, 13th valve, T3 and pipeline;

[0056] The raw water tank is connected to the bottom of the second column through the second pump, pipeline, 16th valve and the second lower connecting pipe, and the upper part of the second column is connected to the raw water tank through the second upper connecting pipe, 15th valve, T3 and pipeline;

[0057] The raw water tank is connected to the bottom of the third column through the second pump, pipeline, 18th valve and the third lower pipe, and the upper part of the third column is connected to the raw water tank through the third upper pipe, 17th valve, T3 and pipeline;

[0058] The regeneration agent, transformation agent or countercurrent column washing water is connected to the first column through the pipeline, the 30th valve, the pipeline, the 20th valve and the first lower connecting pipe, the downstream column washing water is connected to the first column through the pipeline, the 31st valve, the pipeline, the 19th valve and the first upper connecting pipe, the resin regeneration liquid passes through the first upper connecting pipe, the 21st valve, the pipeline and the T6 de-regeneration liquid treatment system, the resin transformation liquid and the countercurrent column washing wastewater pass through the first upper connecting pipe, the 19th valve, the pipeline, the 28th valve, the pipeline and the T5 de-washing column wastewater treatment system, and the downstream column washing wastewater passes through the first lower connecting pipe, the 20th valve, the pipeline, the 29th valve, the pipeline and the T5 de-washing column wastewater treatment system;

[0059] The regeneration agent, transformation agent or countercurrent column washing water is connected to the second column through the pipeline, the 30th valve, the pipeline, the 23rd valve and the second lower connecting pipe, the downstream column washing water is connected to the second column through the pipeline, the 31st valve, the pipeline, the 22nd valve and the second upper connecting pipe, the resin regeneration liquid passes through the second upper connecting pipe, the 24th valve, the pipeline and the T6 de-regeneration liquid treatment system, the resin transformation liquid and the countercurrent column washing wastewater pass through the second upper connecting pipe, the 22nd valve, the pipeline, the 28th valve, the pipeline and the T5 de-washing column wastewater treatment system, and the downstream column washing wastewater passes through the second lower connecting pipe, the 23rd valve, the pipeline, the 29th valve, the pipeline and the T5 de-washing column wastewater treatment system;

[0060] The regeneration agent, transformation agent or countercurrent column washing water is connected to the third column through the pipeline, the 30th valve, the pipeline, the 26th valve and the 3rd lower connecting pipe. The downstream column washing water is connected to the third column through the pipeline, the 31st valve, the pipeline, the 25th valve and the 3rd upper connecting pipe. The resin regeneration liquid passes through the 3rd upper connecting pipe, the 27th valve, the pipeline and the T6 regeneration liquid treatment system. The resin transformation liquid and countercurrent column washing wastewater pass through the 3rd upper connecting pipe, the 25th valve, the pipeline, the 28th valve, the pipeline and the T5 column washing wastewater treatment system. The downstream column washing wastewater passes through the 3rd lower connecting pipe, the 26th valve, the pipeline, the 29th valve, the pipeline and the T5 column washing wastewater treatment system.

[0061] Further, the pipeline connecting the 1st valve, the 10th valve, the 13th valve, the 19th valve and the 21st valve to the upper part of the 1st column is the 1st upper connecting pipe, and the pipeline connecting the 2nd valve, the 3rd valve, the 14th valve and the 20th valve to the bottom of the 1st column is the 1st lower connecting pipe;

[0062] The pipeline connecting the 4th valve, the 11th valve, the 15th valve, the 22nd valve and the 24th valve to the upper part of the 2nd column is the 2nd upper connecting pipe, and the pipeline connecting the 5th valve, the 6th valve, the 16th valve and the 23rd valve to the bottom of the 2nd column is the 2nd lower connecting pipe;

[0063] The pipeline connecting the 7th valve, the 12th valve, the 17th valve, the 25th valve and the 27th valve to the upper part of the 3rd column is the 3rd upper connecting pipe, and the pipeline connecting the 8th valve, the 9th valve, the 18th valve and the 26th valve to the bottom of the 3rd column is the 3rd lower connecting pipe;

[0064] Further, the raw water in the raw water pool enters the upper part of the first column through the first pump, pipeline, T1, the first valve and the first upper pipe; enters the upper part of the second column through the resin layer in the first column, the first lower pipe connected to the bottom of the first column, the second valve, T2, pipeline, the 11th valve and the upper pipe 2, and then passes through the resin layer in the second column, the second lower pipe connected to the bottom of the second column, the sixth valve, T4 and the pipeline to be discharged to the post-handling water treatment system;

[0065] The raw water in the raw water pool enters the upper part of the second column through the first pump, pipeline, T1, the fourth valve and the second upper pipe, passes through the resin layer in the second column, and enters the upper part of the third column through the second lower pipe connected to the bottom of the second column, the fifth valve, T2, pipeline, the twelfth valve and the third upper pipe, and then passes through the resin layer in the third column, and is discharged to the post-handling water treatment system through the third lower pipe connected to the bottom of the third column, the ninth valve, T4 and pipeline;

[0066] The raw water in the raw water pool enters the upper part of the third column through the first pump, pipeline, TI, the seventh valve and the third upper pipe, passes through the resin layer in the third column, and enters the upper part of the first column through the third lower pipe connected to the bottom of the third column, the eighth valve, T2, pipeline, the tenth valve and the first upper pipe, and then passes through the resin layer in the first column, and is discharged to the post-handling water treatment system through the first lower pipe connected to the bottom of the first column, the third valve, T4 and pipeline;

[0067] The raw water from the raw water pool enters the bottom of the first column through pump 2, pipeline, valve 14 and the first lower pipe, passes through the resin layer in the first column, and enters the raw water pool through the first upper pipe, valve 13, T3 and pipeline;

[0068] The raw water from the raw water pool enters the bottom of the second column through pump 2, pipeline, valve 16 and the second lower pipe, passes through the resin layer in the second column, and enters the raw water pool through the second upper pipe, valve 15, T3 and pipeline;

[0069] The raw water from the raw water pool enters the bottom of the third column through pump 2, pipeline, the 18th valve and the 3rd lower connecting pipe, passes through the resin layer in the 3rd column, and enters the raw water pool through the 3rd upper connecting pipe, the 17th valve, T3 and the pipeline.

[0070] The regeneration agent enters the first column through the pipeline, the 30th valve, the pipeline, the 20th valve and the 1st lower connection pipe, and the resin regeneration liquid passes through the 21st valve, the pipeline and the T6 regeneration liquid treatment system; the transformation agent enters the first column through the pipeline, the 30th valve, the pipeline, the 20th valve and the 1st lower connection pipe, and the resin transformation liquid passes through the 1st upper connection pipe, the 19th valve, the pipeline, the 28th valve, the pipeline and the T5 column washing wastewater treatment system; the countercurrent column washing water passes through the pipeline, The 30th valve, pipeline, 20th valve and the 1st lower connecting pipe enter the 1st column, and the countercurrent column washing wastewater passes through the 1st upper connecting pipe, 19th valve, pipeline, 28th valve, pipeline and T5 de-washing column wastewater treatment system; the downstream column washing water passes through the pipeline, 31st valve, pipeline, 19th valve and the 1st upper connecting pipe to enter the 1st column, and the downstream column washing wastewater passes through the 1st lower connecting pipe, 20th valve, pipeline, 29th valve, pipeline and T5 de-washing column wastewater treatment system;

[0071] The regeneration agent enters the second column through the pipeline, the 30th valve, the pipeline, the 23rd valve and the 2nd lower connection pipe, and the resin regeneration liquid passes through the 24th valve, the pipeline and the T6 regeneration liquid treatment system; the transformation agent enters the second column through the pipeline, the 30th valve, the pipeline, the 23rd valve and the 2nd lower connection pipe, and the resin transformation liquid passes through the 2nd upper connection pipe, the 22nd valve, the pipeline, the 28th valve, the pipeline and the T5 column washing wastewater treatment system; the countercurrent column washing water passes through the pipeline, The 30th valve, pipeline, 23rd valve and the 2nd lower connecting pipe enter the 2nd column, and the countercurrent column washing wastewater passes through the 2nd upper connecting pipe, 22nd valve, pipeline, 28th valve, pipeline and T5 de-washing column wastewater treatment system; the downstream column washing water passes through the pipeline, 31st valve, pipeline, 22nd valve and the 2nd upper connecting pipe to enter the 2nd column, and the downstream column washing wastewater passes through the 2nd lower connecting pipe, 23rd valve, pipeline, 29th valve, pipeline and T5 de-washing column wastewater treatment system;

[0072] The regeneration agent enters the third column through the pipeline, the 30th valve, the pipeline, the 26th valve and the 3rd lower connection pipe, and the resin regeneration liquid passes through the 27th valve, the pipeline and the T6 regeneration liquid treatment system; the transformation agent enters the third column through the pipeline, the 30th valve, the pipeline, the 26th valve and the 3rd lower connection pipe, and the resin transformation liquid passes through the 3rd upper connection pipe, the 25th valve, the pipeline, the 28th valve, the pipeline and the T5 column washing wastewater treatment system; the countercurrent column washing water passes through the pipeline, The 30th valve, pipeline, 26th valve and 3rd lower pipe enter the 3rd column, and the countercurrent column washing wastewater passes through the 3rd upper pipe, 25th valve, pipeline, 28th valve, pipeline and T5 de-washing column wastewater treatment system; the downstream column washing water passes through the pipeline, 31st valve, pipeline, 25th valve and 3rd upper pipe to enter the 3rd column, and the downstream column washing wastewater passes through the 3rd lower pipe, 26th valve, pipeline, 29th valve, pipeline and T5 de-washing column wastewater treatment system;

[0073] Furthermore, the system consists of four subsystems: (1) a double-column alternating series continuous operation system consisting of the 1st pump, the 1st valve to the 9th valve and corresponding pipelines; (2) an online detection system consisting of online detectors T1-T6, the 10th valve to the 12th valve and corresponding pipelines; (3) a countercurrent circulation saturation system consisting of pump 2, the 13th valve to the 18th valve and corresponding pipelines; and (4) a resin regeneration and cleaning system consisting of valves 19th valve to the 31st valve and corresponding pipelines.

[0074] A continuous series operation and circulating saturated ion exchange system, wherein the first column, the second column and the third column are equipped with different resins according to the different target substances contained in the raw water to be recovered or removed, and the operation principle and steps are as follows:

[0075] (1) Step 1 starts operation: the first pump is started, the first valve, the second valve, the eleventh valve, and the sixth valve are opened, and the raw water in the raw water pool enters the first column at a set flow rate through the first pump, T1, the first valve, and the first upper pipe, passes through the resin layer in the first column, and then enters the second column through the first lower pipe, the second valve, T2, the eleventh valve, and the second upper pipe. After passing through the resin layer of the second column, it is discharged through the second lower pipe, the sixth valve, and T4 to become the post-delivery water to the post-delivery water treatment system. At this time, the system is a series of columns 1 and 2 running downstream;

[0076] (2) Step 2 Series Column Switching 1: When the first column and the second column in step 1 are running in series until M 1When the value reaches the set value, it indicates that the target substance in the raw water adsorbed by the resin in the first column is close to saturation. The first valve, the second valve, the eleventh valve and the sixth valve are closed, and the fourth valve, the fifth valve, the twelfth valve and the ninth valve are opened. The raw water enters the second column through the first pump, T1, the fourth valve and the second upper pipe, passes through the resin layer in the second column, enters the third column through the second lower pipe, the fifth valve, T2, the twelfth valve and the third upper pipe, passes through the resin layer of the third column, and is discharged to the after-hand water treatment system through the third lower pipe and the ninth valve. At this time, the system switches to the second column and the third column in series and downstream operation.

[0077] (3) Step 3: Resin countercurrent circulation saturation in the first column: When the first valve, the second valve, the eleventh valve and the sixth valve are closed in step 2, the second pump is started, the thirteenth valve and the fourteenth valve are opened, and the raw water passes through the fourteenth valve at a set flow rate, enters the first column through the first lower pipe, and then returns to the raw water tank from the first upper pipe, the thirteenth valve and T3, and after the target content in the water is detected by T3, it is tested for the content of the target substance in the water. 2 When the value reaches the set value, it indicates that the resin is fully saturated, the cycle ends, the second pump stops, and the 14th valve closes;

[0078] (4) Step 4: Recovery of raw water in the first column and cleaning of the resin before regeneration: a) If it is necessary to control the content of the components in the raw water, in step 3, while closing valve 14, valves 30 and 20 are opened, the column washing water enters the first column at a set flow rate through valves 30, 20 and the first lower connection pipe, the raw water in the first column is pushed out by the column washing water and returned to the raw water tank for recovery through the first upper connection pipe, valve 13 and T3. When the column washing water inflow reaches the set amount, the raw water in the first column is completely pushed out by the column washing water, valve 13 is closed, valves 19 and 28 are opened, the column washing water continues to countercurrently clean the resin, and the column washing wastewater is discharged through the first upper connection pipe, valve 19, valve 28 and T3. 5 is discharged into the column washing wastewater treatment system. When the column washing water inflow reaches the set amount, the column washing water is stopped, and the resin in the first column is thoroughly cleaned before the next regeneration begins; b) If there is no need to control the content of the components in the raw water, when the 14th valve is closed in step 3, the 30th valve and the 20th valve are opened, and the column washing water enters the first column through the 30th valve, the 20th valve and the first lower pipe at a set flow rate to clean the resin in the first column. The column washing wastewater returns to the raw water pool through the first upper pipe, the 13th valve and T3. When the column washing water inflow reaches the set amount, the column washing water is stopped, the 13th valve is closed, and the resin in the first column is thoroughly cleaned before the next regeneration begins;

[0079] (5) Step 5: Resin regeneration in column 1: a) If the target substance content in the regeneration liquid needs to be controlled, valves 19 and 28 are opened, and the quantitative regeneration agent enters column 1 through valves 30, 20 and the first lower connection pipe at a set flow rate to regenerate the resin in column 1. The wash water in column 1 is pushed out by the regeneration liquid through the first upper connection pipe, valves 19, 28 and T5 and is sent to the wash water treatment system after being detected by T5. When the detection value of T5 reaches the set value, it means that the resin in column 1 is The washing water has been completely pushed out by the regeneration liquid, the 19th valve is closed, the 21st valve is opened, and the regeneration liquid in the first column is sent to the regeneration liquid treatment system through the 1st upper pipe, the 21st valve and T6; b) If there is no need to control the target content in the regeneration liquid, the 21st valve is opened, and the quantitative regeneration agent enters the first column at a set flow rate through the 30th valve, the 20th valve and the 1st lower pipe to regenerate the resin in the first column, and the regeneration liquid in the first column is sent to the regeneration liquid treatment system through the 1st upper pipe, the 21st valve and T6;

[0080] When the regeneration agent entering the first column reaches the set amount, stop feeding the regeneration agent, and the column washing water enters the first column again through the 30th valve, the 20th valve and the first lower pipe, pushes out the regeneration liquid in the first column and discharges it into the regeneration liquid treatment system from the first upper pipe, the 21st valve and T6. When the T6 detection value reaches the set value, the regeneration agent has been completely pushed out by the column washing water, the 21st valve is closed, the 19th valve and the 28th valve are opened, and the column washing wastewater goes to the column washing wastewater treatment system through the first upper pipe, the 19th valve, the 28th valve and T5, and then The resin is continuously cleaned in countercurrent. When the column washing water inflow reaches the set amount, the 28th valve and the 30th valve are closed, the 29th valve and the 31st valve are opened, and the column washing water enters the first column through the 31st valve, the 19th valve and the upper connecting pipe, and then goes to the column washing wastewater treatment system through the first lower connecting pipe, the 20th valve, the 29th valve and T5 to clean the resin in the downstream. When the detection value of T5 reaches the set value, the resin cleaning in the first column is completed, the column washing water stops inflowing, the 29th valve and the 31st valve are closed, and the resin regeneration and cleaning are completed. (6) Step 6: Resin transformation in the first column: When the 29th and 31st valves in step 5 are closed, the 28th and 30th valves are opened, and the quantitative transformation agent enters the first column through the 30th valve, the 20th valve and the first lower pipe at a set flow rate to transform the resin in the first column. The transformation liquid passes through the first upper pipe, the 19th valve, the 28th valve and T5 to the column washing wastewater treatment system. After the transformation agent enters the first column to reach the set amount, the transformation agent is stopped, and the column washing water enters the first column through the 30th valve, the 20th valve and the first lower pipe, and then passes through the first upper pipe, the 19th valve, the 28th valve and T5 to the column washing wastewater treatment system. When the column washing water When the inflow reaches the set amount, the 28th valve and the 30th valve are closed, the 29th valve and the 31st valve are opened, and the column washing water enters the first column through the 31st valve, the 19th valve and the upper pipe, and then passes through the first lower pipe, the 20th valve, the 29th valve and T5 and is detected by T5 before going to the column washing wastewater treatment system. When the detection value of T5 reaches the set value, the resin in the first column is washed, the column washing water stops entering, the 19th valve, the 20th valve, the 29th valve and the 31st valve are closed, and the resin transformation and cleaning are completed. This step can be omitted for resins that do not need transformation, the same below; after the resin regeneration, transformation and cleaning are completed, the first column waits for the next switch;

[0081] (7) Step 7 Series column switching 2: When the second column and the third column in step 2 are running in series to M 1 When the value reaches the set value, it indicates that the resin in the second column is close to saturation in adsorbing the target substance in the raw water. Close the 4th, 5th, 12th and 9th valves, open the 7th, 8th, 10th and 3rd valves, and the raw water enters the 3rd column through the 1st pump, T1, the 7th valve and the 3rd upper pipe, passes through the resin layer in the 3rd column, enters the 1st column through the 3rd lower pipe, the 8th valve, T2, the 10th valve and the 1st upper pipe, passes through the resin layer of the 1st column, and is discharged to the after-hand water treatment system through the 1st lower pipe and valve 3. At this time, the system switches to the 3rd column and the 1st column in series and downstream operation.

[0082] (8) Step 8: Resin countercurrent circulation saturation in the second column: When the 4th, 6th, 12th and 9th valves are closed in step 7, the second pump is started, the 15th and 16th valves are opened, and the raw water enters the second column through the 16th valve and the second lower pipe, and then enters the raw water tank from the second upper pipe, the 15th valve and T3. After the target content in the water is detected by T3, it is tested and then enters the raw water tank for countercurrent circulation. When M 2 When the value reaches the set value, the resin in the second column is completely saturated, the cycle ends, the second pump stops, and the 16th valve is closed;

[0083] (9) Step 9: Recovery of raw water in the second column and cleaning of resin before regeneration: a) If it is necessary to control the content of components in the raw water, in step 8, while closing valve 16, valves 30 and 23 are opened, and column washing water enters the second column at a set flow rate through valve 30, valve 23 and the second lower connection pipe, and the raw water in the second column is pushed out by the column washing water and returned to the raw water tank for recovery through the second upper connection pipe, valve 15 and T3. When the column washing water inflow reaches the set amount, the raw water in the second column is completely pushed out by the column washing water, valve 15 is closed, valves 22 and 28 are opened, and the column washing water continues to countercurrently wash the resin, and the column washing wastewater is discharged through the second upper connection pipe, valve 22, valve 28 and T3. 5 is discharged into the column washing wastewater treatment system. When the column washing water inflow reaches the set amount, the column washing water is stopped, and the resin in the second column is thoroughly cleaned before the next regeneration begins; b) If there is no need to control the content of the components in the raw water, in step 8, while the 16th valve is closed, the 30th valve and the 23rd valve are opened, and the column washing water enters the second column through the 30th valve, the 23rd valve and the second lower connecting pipe at a set flow rate to clean the resin in the second column, and the column washing wastewater returns to the raw water pool through the second upper connecting pipe, the 15th valve and T3. When the column washing water inflow reaches the set amount, the column washing water is stopped, the 15th valve is closed, and the resin in the second column is thoroughly cleaned before the next regeneration begins.

[0084] (10) Step 10 Regeneration of resin in the second column: a) If it is necessary to control the target substance content in the regeneration liquid, valves 22 and 28 are opened, and the quantitative regeneration agent enters the second column through valves 30, 23 and the second lower pipe at a set flow rate to regenerate the resin in the second column. The wash water in the second column is pushed out by the regeneration liquid and passes through the second upper pipe, valve 22, valve 28 and T5 and is detected by T5 before being sent to the wash water treatment system. When the detection value of T5 reaches the set value, it means that the second column is The washing water in the column has been completely pushed out by the regeneration liquid, the 22nd valve is closed, the 24th valve is opened, and the regeneration liquid in the second column is sent to the regeneration liquid treatment system through the 2nd upper pipe, the 24th valve and T6; b) If there is no need to control the target substance content in the regeneration liquid, the 24th valve is opened, and the quantitative regeneration agent enters the second column at a set flow rate through the 30th valve, the 23rd valve and the 2nd lower pipe to regenerate the resin in the second column, and the regeneration liquid in the second column is sent to the regeneration liquid treatment system through the 2nd upper pipe, the 24th valve and T6;

[0085] When the regeneration agent entering the second column reaches the set amount, stop feeding the regeneration agent, and the column washing water enters the second column again through the 30th valve, the 23rd valve and the second lower pipe, pushes out the regeneration liquid in the second column and discharges it into the regeneration liquid treatment system from the second upper pipe, the 24th valve and T6. When the T6 detection value reaches the set value, the regeneration agent has been completely pushed out by the column washing water, the 24th valve is closed, the 22nd valve and the 28th valve are opened, and the column washing wastewater is sent to the column washing wastewater treatment system through the second upper pipe, the 22nd valve, the 28th valve and T5. The resin is continuously cleaned in countercurrent. When the column washing water inflow reaches the set amount, the 28th and 30th valves are closed, the 29th and 31st valves are opened, and the column washing water enters the second column through the 31st valve, the 22nd valve and the upper connecting pipe, and then goes to the column washing wastewater treatment system through the second lower connecting pipe, the 23rd valve, the 29th valve and T5 to clean the resin in downstream. When the detection value of T5 reaches the set value, the resin cleaning in the second column is completed, the column washing water stops inflowing, the 29th and 31st valves are closed, and the resin regeneration and cleaning are completed.

[0086] (11) Step 11: Resin transformation in the second column: When the 29th valve and the 31st valve in step 10 are closed, the 28th valve and the 30th valve are opened, and the quantitative transformation agent enters the second column through the 30th valve, the 23rd valve and the second lower pipe at a set flow rate to transform the resin in the second column. The transformation liquid passes through the second upper pipe, the 22nd valve, the 28th valve and T5 to the column washing wastewater treatment system. After the transformation agent enters the second column to reach the set amount, the transformation agent is stopped, and the column washing water enters the second column through the 30th valve, the 23rd valve and the second lower pipe, and then passes through the second upper pipe, the 22nd valve, the 28th valve and T5 to the column washing wastewater treatment system. Wastewater treatment system: when the column washing water inflow reaches the set amount, the 28th valve and the 30th valve are closed, the 29th valve and the 31st valve are opened, and the column washing water enters the second column through the 31st valve, the 22nd valve and the upper pipe, and then passes through the second lower pipe, the 23rd valve, the 29th valve and T5 and is detected by T5 before going to the column washing wastewater treatment system. When the detection value of T5 reaches the set value, the resin in the second column is washed, the column washing water stops inflowing, the 22nd valve, the 23rd valve, the 29th valve and the 31st valve are closed, and the resin transformation and cleaning are completed; after the resin regeneration, transformation and cleaning are completed, the second column waits for the next switch;

[0087] (12) Step 12 Series column switching 3: When the third column and the first column in step 7 are running in series to M 1 When the value reaches the set value, it indicates that the resin in the third column is close to saturation in adsorbing the target substance in the raw water. Close the seventh valve, the eighth valve, the tenth valve and the valve 3, and switch to the first column and the second column in series and downstream operation according to step 1;

[0088] (13) Step 13: Resin countercurrent circulation saturation in the third column: When the 7th, 8th, 10th and 3rd valves are closed in step 12, the 2nd pump is started, the 17th and 18th valves are opened, and the raw water enters the second column through the 18th valve and the 3rd lower pipe, and then enters the raw water tank through the 3rd upper pipe, the 17th valve and T3 and detects the target content in the water through T3, and performs countercurrent circulation. When M 2 When the value reaches the set value, the resin in the third column is completely saturated, the cycle ends, the second pump stops, and the 18th valve is closed;

[0089] (14) Step 14: Recovery of raw water in the third column and cleaning of the resin before regeneration: a) If it is necessary to control the content of the components in the raw water, in step 13, while closing valve 18, valves 30 and 26 are opened, the column washing water enters the third column at a set flow rate through valves 30, 26 and the third lower connection pipe, the raw water in the third column is pushed out by the column washing water and returned to the raw water tank for recovery through the third upper connection pipe, valve 17 and T3. When the column washing water inflow reaches the set amount, the raw water in the third column is completely pushed out by the column washing water, valve 17 is closed, valves 25 and 28 are opened, the column washing water continues to countercurrently clean the resin, and the column washing wastewater is discharged through the third upper connection pipe, valves 25, 28 and T5 is discharged into the column washing wastewater treatment system. When the column washing water inflow reaches the set amount, the column washing water is stopped, and the resin in the third column is thoroughly cleaned before the next regeneration begins; b) If there is no need to control the content of the components in the raw water, in step 13, while the 18th valve is closed, the 30th valve and the 26th valve are opened, and the column washing water enters the third column through the 30th valve, the 26th valve and the third lower connecting pipe at a set flow rate to clean the resin in the third column. The column washing wastewater returns to the raw water pool through the third upper connecting pipe, the 17th valve and T3. When the column washing water inflow reaches the set amount, the column washing water is stopped, the 17th valve is closed, and the resin in the third column is thoroughly cleaned before the next regeneration begins.

[0090] (15) Step 15 Regeneration of resin in column 3: a) If it is necessary to control the target substance content in the regeneration liquid, valves 25 and 28 are opened, and the quantitative regeneration agent enters column 3 through valves 30, 26 and the third lower pipe at a set flow rate to regenerate the resin in column 3. The wash water in column 3 is pushed out by the regeneration liquid and passes through the third upper pipe, valve 25, valve 28 and T5 and is detected by T5 before being sent to the wash water treatment system. When the detection value of T5 reaches the set value, it indicates that column 3 is regenerated. The washing water in the column has been completely pushed out by the regeneration liquid, the 25th valve is closed, the 27th valve is opened, and the regeneration liquid in the 3rd column is sent to the regeneration liquid treatment system through the 3rd upper pipe, the 27th valve and T6; b) If there is no need to control the target substance content in the regeneration liquid, the 27th valve is opened, and the quantitative regeneration agent enters the 3rd column at a set flow rate through the 30th valve, the 26th valve and the 3rd lower pipe to regenerate the resin in the 3rd column, and the regeneration liquid in the 3rd column is sent to the regeneration liquid treatment system through the 3rd upper pipe, the 27th valve and T6;

[0091] When the regeneration agent entering the third column reaches the set amount, stop feeding the regeneration agent, and the column washing water enters the third column again through the 30th valve, the 26th valve and the 3rd lower pipe, pushes out the regeneration liquid in the third column and discharges it into the regeneration liquid treatment system from the 3rd upper pipe, the 27th valve and T6. When the T6 detection value reaches the set value, the regeneration agent has been completely pushed out by the column washing water, the 27th valve is closed, the 25th valve and the 28th valve are opened, and the column washing wastewater goes to the column washing wastewater treatment system through the 3rd upper pipe, the 25th valve, the 28th valve and T5, and then The resin is continuously cleaned in countercurrent. When the column washing water inflow reaches the set amount, the 28th valve and the 30th valve are closed, the 29th valve and the 31st valve are opened, and the column washing water enters the 3rd column through the 31st valve, the 25th valve and the upper connecting pipe, and then goes to the column washing wastewater treatment system through the 3rd lower connecting pipe, the 26th valve, the 29th valve and T5 to clean the resin in downstream. When the detection value of T5 reaches the set value, the resin cleaning in the 3rd column is completed, the column washing water stops inflowing, the 29th valve and the 31st valve are closed, and the resin regeneration and cleaning are completed.

[0092] (16) Step 16: Resin transformation in the third column: When the 29th and 31st valves in step 15 are closed, the 28th and 30th valves are opened, and the quantitative transformation agent enters the third column through the 30th valve, the 26th valve and the third lower pipe at a set flow rate to transform the resin in the third column. The transformation liquid passes through the third upper pipe, the 25th valve, the 28th valve and T5 to the column washing wastewater treatment system. After the transformation agent enters the third column and reaches the set amount, the transformation agent is stopped, and the column washing water enters the third column through the 30th valve, the 26th valve and the third lower pipe, and then passes through the third upper pipe, the 25th valve, the 28th valve and T5 to the column washing wastewater treatment system. Wastewater treatment system: when the column washing water inflow reaches the set amount, the 28th valve and the 30th valve are closed, the 29th valve and the 31st valve are opened, and the column washing water enters the 3rd column through the 31st valve, the 25th valve and the upper pipe, and then passes through the 3rd lower pipe, the 26th valve, the 29th valve and T5 and is detected by T5 before going to the column washing wastewater treatment system. When the detection value of T5 reaches the set value, the resin in the 3rd column is washed, the column washing water stops inflowing, the 25th valve, the 26th valve, the 29th valve and the 31st valve are closed, and the resin transformation and cleaning are completed; after the resin regeneration, transformation and cleaning are completed, the 3rd column waits for the next switch;

[0093] (17) Repeat steps 2-(16) to achieve continuous operation of the system;

[0094] (18) After the raw water is adsorbed by the series column to remove the target substance, the post-delivery water is tested by the online detector T4 and then discharged into the post-delivery treatment system. T4 is set to ensure that the content of the target substance in the post-delivery water does not exceed the set value. In general, it is tested online through T1 and T2, and according to the set M 1 The control of the value can ensure the normal and continuous operation of the system, but in abnormal conditions, including but not limited to water quality exceeding the normal range, M 1If the value is set too high or too low, part of the resin fails or regeneration is poor, or there is equipment failure, the T4 detection value will exceed the set value. Once the T4 value exceeds the standard, the resin column automatically switches to continue running. At the same time, the system needs to adjust the process parameters and operating procedures or troubleshoot the problem.

[0095] Furthermore, the valve is one of a manual valve, an automatic valve, an automatic valve with a manual valve bypass (which can be switched manually or automatically), or a combination of several of them.

[0096] Compared with the prior art, the present invention has the following beneficial effects:

[0097] 1. Through the downstream double-column series connection of the resin column to adsorb the target substance and the countercurrent circulation saturation adsorption before the resin regeneration, the saturation rate before the resin regeneration can reach more than 99%, which is conducive to obtaining high-purity and high-content regeneration (recovery) liquid containing the target substance;

[0098] 2. The target object can be prevented from leaking by running two columns in series. The recovery rate or removal rate of the target object can reach more than 99%, which significantly improves the recovery rate or purity of the target object.

[0099] 3. Through online monitoring and control of the continuous double-column series operation, resin regeneration and cleaning process, the target material content in the liquid is kept stable and the loss of the liquid is reduced while obtaining high-purity target liquid, and the amount of regeneration agent and cleaning water is reduced;

[0100] 4. Through the alternating series connection of two columns, continuous operation can realize the simultaneous operation of two columns in series and the countercurrent circulation saturation, regeneration and cleaning of resin, and the use of online detection control can realize automatic and unmanned operation;

[0101] 5. Regeneration after the resin is fully saturated can increase the content and purity of the target substance in the regenerated (recovered) liquid;

[0102] 6. Improved resin utilization, target recovery, and the operating efficiency and benefits of the ion exchange system. BRIEF DESCRIPTION OF THE DRAWINGS

[0103] Figure 1 It is a schematic diagram of the structure of the invention and a schematic diagram of the structure of Example 1;

[0104] Figure 2 It is a schematic diagram of the structure of the invention and a schematic diagram of the structure of Example 2;

[0105] Figure 3 This is a structural schematic diagram of Example 3. DETAILED DESCRIPTION

[0106] The specific embodiments of the present invention are described in detail below, but it should be understood that the protection scope of the present invention is not limited by the specific embodiments.

[0107] Unless explicitly stated otherwise, throughout the specification and claims, the term “comprise” or variations such as “include” or “comprising”, etc., will be understood to include the stated elements or components but not to exclude other elements or components.

[0108] Example 1

[0109] System composition and working principle (see attached Figure 1 ):

[0110] This device consists of a raw water tank, the first pump, pump 2, the first column, the second column and the third column ion exchange column, the first valve to the 33rd valve, the first to the third upper pipes, the first to the third lower pipes, the online detection system and pipelines, including 4 subsystems: a double-column alternating series continuous operation system, consisting of the first pump, the first valve to the ninth valve and the corresponding pipelines; an online detection system, consisting of online detectors T1-T6, the tenth valve to the twelfth valve and the corresponding pipelines, of which T1-T4 and T6 are online colorimeters, and T5 is an online pH meter; a countercurrent circulation saturation system, consisting of pump 2, the thirteenth valve to the eighteenth valve and the corresponding pipelines; a resin regeneration and cleaning system, consisting of the nineteenth valve to the thirty-third valve and the corresponding pipelines. The first column to the third column is filled with sodium-type ion exchange resin, which is used to recover nickel from nickel-containing wastewater. Its working principle is as follows:

[0111] 1. Start operation: Start the first pump, open the first valve, the second valve, the eleventh valve, and the sixth valve. The raw water (nickel-containing wastewater) in the raw water pool enters the first column through the first pump, T1, the first valve, and the first upper pipe. After passing through the resin layer in the first column, it enters the second column through the first lower pipe, the second valve, T2, the eleventh valve, and the second upper pipe. After passing through the resin layer of the second column, it is discharged to the post-handling water treatment system through the second lower pipe, the sixth valve, and T4. At this time, the system is a series of columns 1 and 2 running downstream. When the resin in the first column adsorbs nickel ions to a certain extent, nickel ions begin to leak. As the saturation of the resin in the first column gradually increases, the leakage of nickel ions also gradually increases. The color detection value C of T2 2 It also gradually increases and gradually approaches the chromaticity detection value C of T1 1 , M 1 =C 2 / C 1 The value gradually increases. During the operation, the nickel ions leaking from the first column are continuously adsorbed by the resin in the second column, ensuring that the nickel ions in the raw water are completely adsorbed and discharged.

[0112] 2. Series column switching 1: When the first column and the second column run in series to M 1≧A (set value), indicating that the resin in the first column is close to saturation of nickel adsorption (saturation ≧70%), close the first valve, the second valve, the eleventh valve and the sixth valve, open the fourth valve, the fifth valve, the twelfth valve and the ninth valve, the raw water enters the second column through the first pump, T1, the fourth valve and the second upper pipe, passes through the resin layer in the second column, enters the third column through the second lower pipe, the fifth valve, T2, the twelfth valve and the third upper pipe, passes through the resin layer of the third column, and is discharged to the after-hand water treatment system through the third lower pipe, the ninth valve and T4. At this time, the system switches to the second column and the third column in series and downstream operation;

[0113] 3. Countercurrent circulation saturation of the resin in the first column: When the first valve, the second valve, the eleventh valve and the sixth valve are closed in step 2, pump 2 is started, the thirteenth valve and the fourteenth valve are opened, and the raw water enters the first column through the fourteenth valve and the first lower pipe, and then enters the raw water pool through the first upper pipe, the thirteenth valve and T3, and performs a countercurrent circulation, so that the unsaturated part of the resin continues to adsorb nickel ions until it is completely saturated. As the resin saturation increases, the color detection value C of T3 increases. 3 Gradually rising, when M 2 =C 3 / C 1 ≧B (set value), indicating that the resin in column 1 is completely saturated, the circulation is over, pump 2 is stopped, and valve 14 is closed.

[0114] 4. Recovery of raw water in the first column and cleaning of the resin before regeneration: In step 3, while the 14th valve is closed, the 20th valve is opened, and the column washing water enters the first column through the 20th valve and the first lower connecting pipe at a set flow rate to clean the resin in the first column. The column washing waste water returns to the raw water tank through the first upper connecting pipe, the 13th valve and T3. When the column washing water inflow reaches the set amount, the column washing water is stopped, the 13th valve is closed, and the resin in the first column is thoroughly cleaned before the next step of regeneration begins.

[0115] 5. Resin regeneration in the first column: When the 13th valve is closed and the 23rd valve is opened in step 4, the regenerant (sulfuric acid, the same below) enters the first column through the 20th valve and the first lower connecting pipe. The nickel adsorbed by the resin is continuously desorbed by the regenerant and becomes a regenerated liquid containing nickel sulfate. At the same time, the washing water in the first column is continuously pushed out by the regenerated liquid and discharged through the first upper connecting pipe and the 23rd valve, and then goes to the washing water treatment system through T5. When the detected pH value of T5 ≤ C (set value), it indicates that the regenerated liquid has pushed out all the residual washing water in the first column. The 23rd valve is closed, the 21st valve is opened, and the regenerated liquid in the first column goes to the regenerated liquid treatment system through the first upper connecting pipe, the 21st valve and T6. When the amount of regenerant entering the first column reaches the set amount, the supply of regenerant is stopped. The washing water enters the first column again through the 20th valve and the first lower connecting pipe, and pushes the regenerated liquid in the first column into the regenerated liquid treatment system through the first upper connecting pipe, the 21st valve and T6. When the chromaticity value of T6 < D (set value), it indicates that most of the regenerated liquid in the first column has been pushed out by the washing water. At this time, the 21st valve is closed, the 23rd valve is opened, and the washing water goes to the washing wastewater treatment system through the first upper connecting pipe, the 23rd valve and T5 to clean the resin countercurrently. When the amount of washing water inlet reaches the set amount, the 20th valve and the 23rd valve are closed, the 19th valve and the 22nd valve are opened, and the washing water enters the first column through the 19th valve and the first upper connecting pipe, and then goes to the washing wastewater treatment system through the first lower connecting pipe, the 22nd valve and T5 to clean the resin in a co-current manner. When the detected pH value of T5 ≥ E (set value), the supply of washing water is stopped, the 19th valve and the 22nd valve are closed, and the resin regeneration and cleaning are completed;

[0116] 6. Resin transformation in the first column: When the 19th valve and the 22nd valve are closed and the 20th valve and the 23rd valve are opened in step 5, the transformation agent (sodium hydroxide solution, the same below) enters the first column through the 20th valve and the first lower connecting pipe, and then goes to the washing wastewater treatment system through the first upper connecting pipe, the 23rd valve and T5. When the amount of transformation agent entering the first column reaches the set amount, the supply of transformation agent is stopped. The washing water enters the first column through the 20th valve and the first lower connecting pipe, and then goes to the washing wastewater treatment system through the first upper connecting pipe, the 23rd valve and T5 to clean the resin countercurrently. When the amount of washing water inlet reaches the set amount, the 20th valve and the 23rd valve are closed, the 19th valve and the 22nd valve are opened, and the washing water enters the first column through the 19th valve and the first upper connecting pipe, and then goes to the washing wastewater treatment system through the first lower connecting pipe, the 22nd valve and T5 to clean the resin in a co-current manner. When the detected pH value of T5 ≤ F (set value), the supply of washing water is stopped, the 19th valve and the 22nd valve are closed, and the resin transformation and cleaning are completed. The first column waits for the next switch;

[0117] 7. Series column switching 2: When the second column and the third column are in series operation until M in step 2 1≧A, indicating that the nickel ions in the raw water adsorbed by the resin in the second column are close to saturation. The fourth valve, the fifth valve, the twelfth valve and the ninth valve are closed, and the seventh valve, the eighth valve, the tenth valve and the third valve are opened. The raw water enters the third column through the first pump, T1, the seventh valve and the third upper pipe, passes through the resin layer in the third column, enters the first column through the third lower pipe, the eighth valve, T2, the tenth valve and the first upper pipe, passes through the resin layer in the first column, and is discharged to the after-handling water treatment system through the first lower pipe, the third valve and T4. At this time, the system switches to the third column and the first column in series and downstream operation;

[0118] 8. Resin countercurrent circulation saturation in the second column: When the 4th, 5th, 12th and 9th valves are closed in step 7, pump 2 is started, valves 15 and 16 are opened, and raw water enters the second column through valve 16 and the second lower pipe, and then enters the raw water tank through the second upper pipe, valve 15 and T3 for countercurrent circulation. 2 ≧B,, indicating that the resin in the second column is completely saturated, the cycle is over, pump 2 is stopped, and valve 16 is closed;

[0119] 9. Recovery of raw water in the second column and cleaning of resin before regeneration: In step 8, while closing valve No. 16, valve No. 25 is opened, and column washing water enters the second column through valve No. 25 and the second lower connecting pipe to clean the resin in the second column. The column washing waste water returns to the raw water pool through the second upper connecting pipe, valve No. 15 and T3. When the column washing water inflow reaches the set amount, the column washing water is stopped, valve No. 15 is closed, and the resin in the second column is thoroughly cleaned before starting the next step of regeneration.

[0120] 10. Regeneration of resin in the second column: When the 15th valve in step 9 is closed and the 28th valve is opened, the regeneration agent enters the second column through the 25th valve and the second lower pipe, and at the same time, the washing water in the second column is continuously pushed out by the regeneration liquid and discharged through the second upper pipe and the 28th valve, and then goes to the washing water treatment system through T5. When the detected pH value of T5 is ≦C, the 28th valve is closed and the 26th valve is opened. The regeneration liquid in the second column goes to the regeneration liquid treatment system through the second upper pipe, the 26th valve and T6. When the regeneration agent entering the second column reaches the set amount, stop feeding the regeneration liquid, and the washing water enters the second column again through the 25th valve and the second lower pipe. The regeneration liquid in the second column is discharged through the 28th valve and the second lower pipe. The 2nd upper pipe, the 26th valve and T6 are pushed into the regeneration liquid treatment system. When the chromaticity value of T6 is ≦D, the 26th valve is closed, the 28th valve is opened, and the column washing water passes through the 2nd upper pipe, the 28th valve and T5 to the column washing wastewater treatment system to wash the resin in reverse flow. When the column washing water inflow reaches the set amount, the 25th valve and the 28th valve are closed, the 24th valve and the 27th valve are opened, and the column washing water enters the 2nd column through the 24th valve and the 2nd upper pipe, and then passes through the 2nd lower pipe, the 27th valve and T5 to the column washing wastewater treatment system to wash the resin in downstream. When the detected pH value of T5 is ≧E, the column washing water stops inflowing, the 24th valve and the 27th valve are closed, and the resin regeneration and cleaning are completed;

[0121] 11. Resin transformation in the second column: When the 24th and 27th valves in step 10 are closed, the 25th and 28th valves are opened, and the transformation agent enters the second column through the 25th valve and the second lower pipe, and then passes through the second upper pipe, the 28th valve and T5 to the column washing wastewater treatment system. When the transformation agent entering the second column reaches the set amount, stop entering the transformation agent, and the column washing water enters the second column through the 25th valve and the second lower pipe, and then passes through the second upper pipe, the 28th valve and T5 to the column washing wastewater treatment system. The system cleans the resin in reverse flow. When the column washing water inflow reaches the set amount, the 25th valve and the 28th valve are closed, the 24th valve and the 27th valve are opened, and the column washing water enters the second column through the 24th valve and the second upper pipe, and then goes to the column washing wastewater treatment system through the second lower pipe, the 27th valve and T5 to clean the resin downstream. When the pH value detected by T5 is ≦F, the column washing water stops inflow, the 24th valve and the 27th valve are closed, the resin transformation and cleaning are completed, and the second column waits for the next switch;

[0122] 12. Series column switching 3: When the third column and the first column in step 7 are running in series to M 1 ≧A, indicating that the resin in the third column is close to saturation in adsorbing nickel ions in the raw water. Close valves 7, 8, 10 and 3, and switch to the first and second columns in series and run downstream according to step 1;

[0123] 13. Countercurrent circulation saturation of resin in column 3: When valves 7, 8, 10 and 3 are closed in step 12, pump 2 is started, valves 17 and 18 are opened, and raw water enters column 3 through valve 18 and lower pipe 3, and then enters raw water tank through upper pipe 3, valve 17 and T3 for countercurrent circulation. 2 ≧B, indicating that the resin in the third column is completely saturated, the cycle is over, pump 2 is stopped, and valve 18 is closed;

[0124] 14. Recovery of raw water in the third column and cleaning of the resin before regeneration: In step 13, while the 18th valve is closed, the 30th valve is opened, and the column washing water enters the third column through the 30th valve and the 3rd lower connecting pipe to clean the resin in the third column. The column washing waste water returns to the raw water tank through the 3rd upper connecting pipe, the 17th valve and T3. When the column washing water inflow reaches the set amount, the column washing water is stopped, the 17th valve is closed, and the resin in the third column is thoroughly cleaned before the next step of regeneration begins.

[0125] 15. Resin regeneration in the third column: When the 17th valve in step 14 is closed and the 33rd valve is opened, the regeneration agent enters the third column through the 30th valve and the 3rd lower pipe, and the washing water in the third column is continuously pushed out by the regeneration liquid and discharged through the 3rd upper pipe and the 33rd valve, and then goes to the washing water treatment system through T5. When the detected pH value of T5 is ≦C, the 33rd valve is closed and the 31st valve is opened. The regeneration liquid in the third column goes to the regeneration liquid treatment system through the 3rd upper pipe, the 31st valve and T6. When the regeneration amount entering the third column reaches the set amount, the regeneration liquid is stopped, and the washing water enters the third column again through the 30th valve and the 3rd lower pipe. The regeneration liquid in the third column is discharged through the 30th valve and the 3rd lower pipe. The 3rd upper pipe, the 31st valve and T6 are pushed into the regeneration liquid treatment system. When the chromaticity value of T6 is ≦D, the 31st valve is closed, the 33rd valve is opened, and the column washing water passes through the 3rd upper pipe, the 33rd valve and T5 to the column washing wastewater treatment system to wash the resin in reverse flow. When the column washing water inflow reaches the set amount, the 30th valve and the 33rd valve are closed, the 29th valve and the 32nd valve are opened, and the column washing water enters the 3rd column through the 29th valve and the 3rd upper pipe, and then passes through the 3rd lower pipe, the 32nd valve and T5 to the column washing wastewater treatment system to wash the resin in downstream. When the detected pH value of T5 is ≧E, the column washing water stops inflowing, the 29th valve and the 32nd valve are closed, and the resin regeneration and cleaning are completed;

[0126] 16. Resin transformation in the third column: When the 29th valve and the 32nd valve are closed in step 15, the 30th valve and the 33rd valve are opened, the transformation agent enters the third column through the 30th valve and the 3rd lower pipe, and then goes to the column washing wastewater treatment system through the 3rd upper pipe, the 33rd valve and T5. When the transformation agent entering the third column reaches the set amount, stop adding the transformation agent, and the column washing water enters the third column through the 30th valve and the 3rd lower pipe, and then goes to the column washing wastewater treatment system through the 3rd upper pipe, the 33rd valve and T5. The resin is cleaned in the reverse flow of the treatment system. When the column washing water inflow reaches the set amount, the 30th valve and the 33rd valve are closed, the 29th valve and the 32nd valve are opened, and the column washing water enters the 3rd column through the 29th valve and the 3rd upper pipe, and then goes to the column washing wastewater treatment system through the 3rd lower pipe, the 32nd valve and T5 to clean the resin downstream. When the pH value detected by T5 is ≦F, the column washing water stops inflowing, the 29th valve and the 32nd valve are closed, the resin transformation and cleaning are completed, and the 3rd column waits for the next switch;

[0127] 17. Repeat steps 2-16.

[0128] 18. The chromaticity detection of T4 is to ensure that the nickel ion content in the water after delivery does not exceed the standard. Once the T4 detection value exceeds the set value, the series columns will be switched according to steps 2, 7, and 12 and continue to run according to the subsequent steps.

[0129] Example 2

[0130] System composition and working principle (see attached Figure 2 ):

[0131] The device consists of a raw water tank, the first pump, pump 2, the first column, the second column and the third column ion exchange column, the first valve to the 31st valve, the first upper pipe to the 3rd upper pipe, the first lower pipe to the 3rd lower pipe, an online detection system and pipelines, including 4 subsystems: (1) a double-column alternating series continuous operation system, consisting of the first pump, the first valve to the 9th valve and corresponding pipelines; (2) an online detection system, consisting of online detectors T1-T6, valves 10-12 and corresponding pipelines, of which T1-T4 are online ORP meters (oxidation electrode potential meters), and T5 and T6 are online pH meters; (3) a countercurrent circulation saturation system, consisting of pump 2, valves 13-18 and corresponding pipelines; (4) a resin regeneration and cleaning system, consisting of valves 19-31 and corresponding pipelines. Columns 1-3 are filled with sulfate anion exchange resin (hereinafter referred to as resin) for recovering Cr from chromium-containing wastewater. 6+ , and its working principle is as follows:

[0132] 1. Start operation: Start the first pump, open the first valve, the second valve, the eleventh valve and the sixth valve, and the raw water (chromium-containing wastewater) in the raw water pool enters the first column through the first pump, T1, the first valve and the first upper pipe, passes through the resin layer in the first column, and then enters the second column through the first lower pipe, the second valve, T2, the eleventh valve and the second upper pipe; after passing through the resin layer of the second column, it is discharged to the after-hand water treatment system through the second lower pipe, the sixth valve and T4; at this time, the system is a series connection of the first column and the second column running downstream.

[0133] 2. Series column switching 1: When the first column and the second column are operated in series to the ORP detection value C of T2 1 ORP detection value C close to T1 2 , when M 1 =(C 2 -C 1 ) / C 1 ≦A, indicating that the resin in the first column adsorbs Cr 6+ When the ions are close to saturation, the 1st valve, the 2nd valve, the 11th valve and the 6th valve are closed, and the 4th valve, the 5th valve, the 12th valve and the 9th valve are opened. The raw water enters the 2nd column through the 1st pump, T1, the 4th valve and the 2nd upper pipe, passes through the resin layer in the 2nd column, enters the 3rd column through the 2nd lower pipe, the 5th valve, T2, the 12th valve and the 3rd upper pipe, passes through the resin layer of the 3rd column, and is discharged to the after-handling water treatment system through the 3rd lower pipe, the 9th valve and T4. At this time, the system switches to the 2nd column and the 3rd column in series and downstream operation;

[0134] 3. Countercurrent circulation saturation of the resin in the first column: When the first valve, the second valve, the eleventh valve and the sixth valve are closed in step 2, pump 2 is started, the thirteenth valve and the fourteenth valve are opened, and the raw water enters the first column through the fourteenth valve and the first lower pipe, and then enters the raw water tank through the first upper pipe, the thirteenth valve and T3, and performs countercurrent circulation, so that the unsaturated part of the resin continues to adsorb Cr 6+ ions to complete saturation, as the resin saturation increases, the ORP detection value of T3 C 3 Gradually rising, when M 2 =(C 3 -C 1 ) / C 1 ≦B, the resin in the first column is completely saturated, the cycle ends, pump 2 stops, and valve 14 is closed.

[0135] 4. Recovery of raw water in the first column and cleaning of the resin before regeneration: When the 14th valve is closed in step 3, the 20th valve and the 30th valve are opened, and the column washing water enters the first column through the 30th valve, the 20th valve and the first lower connecting pipe to clean the resin in the first column. The column washing waste water returns to the raw water tank through the first upper connecting pipe, the 13th valve and T3. When the column washing water inflow reaches the set amount, the column washing water stops entering, the 13th valve is closed, and the resin in the first column is thoroughly cleaned before starting the next step of regeneration.

[0136] 5. Resin regeneration in column 1: When valve 13 in step 4 is closed, valves 19 and 28 are opened, the regeneration agent (sodium hydroxide solution) enters column 1 through valves 30, 20 and the first lower pipe, and the Cr adsorbed by the resin in column 1 is 6+It is desorbed by the regenerant and becomes a regeneration liquid containing sodium chromate. At the same time, the wash water in the first column is pushed out by the regeneration liquid and discharged through the first upper pipe and the 19th valve, and then goes to the wash water treatment system through the 28th valve and T5. When the pH value of T5 is ≧C, it indicates that the regeneration liquid has pushed out all the residual wash water in the first column. The 19th valve is closed and the 21st valve is opened. The regeneration liquid in the first column goes to the regeneration liquid treatment system through the first upper pipe, the 21st valve and T6. When the regeneration agent entering the first column reaches the set amount, the regeneration liquid is stopped. The wash water enters the first column again through the 30th valve, the 20th valve and the first lower pipe, and the regeneration liquid in the first column is pushed into the regeneration liquid treatment system through the first upper pipe, the 21st valve and T6. When The pH value of T6 is ≦D, indicating that most of the regeneration liquid in the first column has been pushed out by the column washing water. At this time, the 21st valve is closed, the 19th valve is opened, and the column washing water passes through the 1st upper pipe, the 19th valve, the 28th valve and the T5 column washing wastewater treatment system to wash the resin in reverse flow. When the column washing water inflow reaches the set amount, the 28th valve and the 30th valve are closed, the 29th valve and the 31st valve are opened, and the column washing water passes through the 31st valve, the 19th valve and the 1st upper pipe to enter the first column, and then passes through the 1st lower pipe, the 20th valve, the 29th valve and the T5 column washing wastewater treatment system to wash the resin in downstream. When the detected pH value of T5 is ≦E, the column washing water stops inflowing, the 29th valve and the 31st valve are closed, and the resin regeneration and washing are completed;

[0137] 6. Resin transformation in the first column: When the 29th and 31st valves in step 5 are closed, the 28th and 30th valves are opened, and the transformation agent (sulfuric acid, the same below) enters the first column through the 30th valve, the 20th valve and the first lower pipe, and then goes to the column washing wastewater treatment system through the first upper pipe, the 19th valve, the 28th valve and T5. When the transformation agent entering the first column reaches the set amount, stop entering the transformation agent, and the column washing water enters the first column through the 30th valve, the 20th valve and the first lower pipe, and then goes to the column washing wastewater treatment system through the first upper pipe, the 19th valve, the 28th valve and T5. Water treatment system, countercurrent cleaning of resin, when the column washing water inflow reaches the set amount, valves 28 and 30 are closed, valves 29 and 31 are opened, column washing water enters column 1 through valve 31, valve 19 and first upper pipe, and then goes to column washing wastewater treatment system through first lower pipe, valve 20, valve 29 and T5, and washes resin downstream. When the pH value detected by T5 is ≧F, column washing water stops inflow, valves 19, 20, 29 and 31 are closed, resin transformation and cleaning are completed, and column 1 waits for the next switch;

[0138] 7. Series column switching 2: When the second column and the third column in step 2 are running in series to M 1 ≦A, the resin in the second column adsorbs Cr in the raw water 6+When the ions are close to saturation, the 4th, 5th, 12th and 9th valves are closed, and the 7th, 8th, 10th and 3rd valves are opened. The raw water enters the 3rd column through the 1st pump, T1, the 7th valve and the 3rd upper pipe, passes through the resin layer in the 3rd column, enters the 1st column through the 3rd lower pipe, the 8th valve, T2, the 10th valve and the 1st upper pipe, passes through the resin layer of the 1st column, and is discharged to the after-handling water treatment system through the 1st lower pipe, the 3rd valve and T4. At this time, the system switches to the 3rd column and the 1st column in series and downstream operation;

[0139] 8. Resin countercurrent circulation saturation in the second column: When the 4th, 5th, 12th and 9th valves in step 7 are closed, pump 2 is started, valves 15 and 16 are opened, and raw water enters the second column through valve 16 and the second lower pipe, and then enters the raw water tank through the second upper pipe, valve 15 and T3 for countercurrent circulation. 2 ≦B, the resin in the second column is completely saturated, the cycle ends, pump 2 stops, and valve 16 is closed.

[0140] 9. Recovery of raw water in the second column and cleaning of the resin before regeneration: When the 16th valve is closed in step 8, the 30th valve and the 23rd valve are opened, and the column washing water enters the second column through the 30th valve, the 23rd valve and the second lower connecting pipe at a set flow rate to clean the resin in the second column. The column washing waste water returns to the raw water pool through the second upper connecting pipe, the 15th valve and T3. When the column washing water inflow reaches the set amount, the column washing water is stopped, the 15th valve is closed, and the resin in the second column is thoroughly cleaned before the next step of regeneration begins.

[0141] 10. Regeneration of resin in the second column: When the 15th valve in step 9 is closed, the 22nd valve and the 28th valve are opened, the regeneration agent enters the second column through the 30th valve, the 23rd valve and the second lower pipe, the wash water in the second column is pushed out by the regeneration liquid and discharged through the second upper pipe and the 22nd valve, and then goes to the wash water treatment system through the 28th valve and T5. When the pH value of T5 is ≧C, the 22nd valve is closed, the 24th valve is opened, and the regeneration liquid in the second column goes to the regeneration liquid treatment system through the second upper pipe, the 24th valve and T6. When the regeneration agent entering the second column reaches the set amount, stop feeding the regeneration liquid, and the wash water enters the second column again through the 30th valve, the 23rd valve and the second lower pipe, and the regeneration liquid in the second column is discharged through the second upper pipe. Take over, the 24th valve and T6 to push into the regeneration liquid treatment system. When the pH value of T6 is ≦D, the 24th valve is closed, the 22nd valve is opened, and the column washing water passes through the 2nd upper take over, the 22nd valve, the 28th valve and T5 to the column washing wastewater treatment system to wash the resin in countercurrent. When the column washing water inflow reaches the specified amount, the 28th valve and the 30th valve are closed, the 29th valve and the 31st valve are opened, and the column washing water passes through the 31st valve, the 22nd valve and the 2nd upper take over to enter the 2nd column, and then passes through the 2nd lower take over, the 23rd valve, the 29th valve and T5 to the column washing wastewater treatment system to wash the resin in downstream. When the detected pH value of T5 is ≦E, the column washing water stops inflowing, the 29th valve and the 31st valve are closed, and the resin regeneration and cleaning are completed.

[0142] 11. Resin transformation in the second column: When the 29th valve and the 31st valve in step 10 are closed, the 28th valve and the 30th valve are opened, the transformation agent enters the second column through the 30th valve, the 23rd valve and the second lower pipe, and then goes to the column washing wastewater treatment system through the second upper pipe, the 22nd valve, the 28th valve and T5. When the transformation agent entering the second column reaches the set amount, stop entering the transformation agent, and the column washing water enters the second column through the 30th valve, the 23rd valve and the second lower pipe, and then goes to the column washing wastewater treatment system through the second upper pipe, the 22nd valve, the 28th valve and T5. The resin is cleaned in the column by countercurrent cleaning system. When the column washing water inflow reaches the set amount, the 28th valve and the 30th valve are closed, the 29th valve and the 31st valve are opened, and the column washing water enters the second column through the 31st valve, the 22nd valve and the second upper connecting pipe, and then goes to the column washing wastewater treatment system through the second lower connecting pipe, the 23rd valve, the 29th valve and T5 to clean the resin downstream. When the detected pH value of T5 is ≧F, the column washing water stops inflowing, the 22nd valve, the 23rd valve, the 29th valve and the 31st valve are closed, the resin transformation and cleaning are completed, and the second column waits for the next switch.

[0143] 12. Series column switching 3: When the third column and the first column in step 7 are running in series to M 1 ≦A, the resin in the third column adsorbs Cr in the raw water 6+ When the ions are close to saturation, close valves 7, 8, 10 and 3, and switch to column 1 and column 2 in series and run downstream according to step 1;

[0144] 13. Resin countercurrent circulation saturation in the third column: When the 7th, 8th, 10th and 3rd valves are closed in step 12, pump 2 is started, the 17th and 18th valves are opened, and the raw water enters the third column through the 18th valve and the 3rd lower pipe, and then enters the raw water tank through the 3rd upper pipe, the 17th valve and T3 for countercurrent circulation. 2 ≦B, the resin in the 3rd column is completely saturated, the cycle ends, pump 2 stops, and valve 18 is closed.

[0145] 14. Recovery of raw water in the third column and cleaning of the resin before regeneration: In step 13, while the 18th valve is closed, the 30th valve and the 26th valve are opened, and the column washing water enters the third column through the 30th valve, the 26th valve and the 3rd lower connecting pipe at a set flow rate to clean the resin in the third column, and the column washing waste water returns to the raw water tank through the 3rd upper connecting pipe, the 17th valve and T3. When the column washing water inflow reaches the set amount, the column washing water is stopped, the 17th valve is closed, and the resin in the third column is thoroughly cleaned before the next step of regeneration begins.

[0146] 15. Resin regeneration in the third column: When the 17th valve in step 14 is closed, the 25th valve and the 28th valve are opened, and the regeneration agent enters the third column through the 30th valve, the 26th valve and the 3rd lower pipe, the wash water in the third column is pushed out by the regeneration liquid and discharged through the 3rd upper pipe and the 25th valve, and then goes to the wash water treatment system through the 28th valve and T5. When the pH value of T5 is ≧C, the 25th valve is closed, the 27th valve is opened, and the regeneration liquid in the third column goes to the regeneration liquid treatment system through the 3rd upper pipe, the 27th valve and T6. When the regeneration amount entering the third column reaches the set amount, stop feeding the regeneration liquid, and the wash water enters the third column again through the 30th valve, the 26th valve and the 3rd lower pipe, and the regeneration liquid in the third column is discharged through the 3rd The upper pipe, the 27th valve and T6 are pushed into the regeneration liquid treatment system. When the pH value of T6 is ≦D, the 27th valve is closed, the 25th valve is opened, and the column washing water passes through the 3rd upper pipe, the 25th valve, the 28th valve and T5 to the column washing wastewater treatment system to wash the resin in reverse flow. When the column washing water inflow reaches the set amount, the 28th valve and the 30th valve are closed, the 29th valve and the 31st valve are opened, and the column washing water passes through the 31st valve, the 25th valve and the 3rd upper pipe to enter the 3rd column, and then passes through the 3rd lower pipe, the 26th valve, the 29th valve and T5 to the column washing wastewater treatment system to wash the resin in downstream. When the detected pH value of T5 is ≦E, the column washing water stops entering, the 29th valve and the 31st valve are closed, and the resin regeneration and cleaning are completed;

[0147] 16. Resin transformation in the third column: When the 29th valve and the 31st valve in step 15 are closed, the 28th valve and the 30th valve are opened, the transformation agent enters the third column through the 30th valve, the 26th valve and the 3rd lower pipe, and then goes to the column washing wastewater treatment system through the 3rd upper pipe, the 25th valve, the 28th valve and T5. When the transformation agent entering the third column reaches the set amount, stop entering the transformation agent, and the column washing water enters the third column through the 30th valve, the 26th valve and the 3rd lower pipe, and then goes to the column washing wastewater treatment system through the 3rd upper pipe, the 25th valve, the 28th valve and T5. The resin is cleaned in the reverse flow of the treatment system. When the column washing water inflow reaches the set amount, the 28th valve and the 30th valve are closed, the 29th valve and the 31st valve are opened, and the column washing water enters the 3rd column through the 31st valve, the 25th valve and the 3rd upper pipe, and then goes to the column washing wastewater treatment system through the 3rd lower pipe, the 26th valve, the 29th valve and T5 to clean the resin downstream. When the pH value of T5 is ≧F, the column washing water stops inflowing, the 25th valve, the 26th valve, the 29th valve and the 31st valve are closed, the resin transformation and cleaning are completed, and the 3rd column waits for the next switch;

[0148] 17. Repeat steps 2-16.

[0149] 18. T4 ORP test is to ensure the Cr content in water after delivery. 6+ The ion content does not exceed the standard. Once the T4 detection value exceeds the set value, the ion exchange system will switch according to steps 2, 7, and 12, and continue to operate according to the subsequent steps.

[0150] Example 3

[0151] System composition and working principle (see attached Figure 3 ):

[0152] This device consists of a raw water tank, the first pump, pump 2, the first column, the second column and the third column ion exchange column, the first to the 33rd valves, the first to the 3rd upper pipes, the first to the 3rd lower pipes, the online detection system and pipelines, including 4 subsystems: a double-column alternating series continuous operation system, consisting of the first pump, the first to the 9th valves and the corresponding pipelines; an online detection system, consisting of online detectors T1-T6, the 10th to the 12th valves and the corresponding pipelines, of which T1-T4 and T6 are online fiber optic color sensors, and T5 is an online pH meter; a countercurrent circulation saturation system, consisting of pump 2, the 13th to the 18th valves and the corresponding pipelines; a resin regeneration and cleaning system, consisting of the 19th to the 33rd valves and the corresponding pipelines. The first to the third columns are filled with hydrogen-type chelated ion exchange resins, which are used to separate and recover copper in copper-containing nickel sulfate solutions. The working principle is as follows:

[0153] 1. Start operation: Start the first pump, open the first valve, the second valve, the eleventh valve, and the sixth valve. The copper-containing nickel sulfate solution in the raw water pool (referred to as raw water, the same below) enters the first column through the first pump, T1, the first valve, and the first upper pipe. After passing through the resin layer in the first column, it enters the second column through the first lower pipe, the second valve, T2, the eleventh valve, and the second upper pipe. After passing through the resin layer of the second column, it is discharged to the after-water treatment system through the second lower pipe, the sixth valve, and T4. At this time, the system is a series of columns 1 and 2 running downstream. When the resin in the first column adsorbs the copper ions in the raw water to a certain extent, the copper ions begin to leak. The copper ions leaked from the first column continue to be adsorbed by the resin in the second column to ensure that the copper ions in the raw water are cleanly adsorbed and then discharged. As the saturation of the resin in the first column gradually increases, the copper ion leakage also gradually increases. The color detection value C of T2 2 It also gradually increases and gradually approaches the color detection value C of T1 1 ;

[0154] 2. Series column switching 1: When the first column and the second column run in series to M 1 =(C 2 -C 1 ) / C 1 ≦A, indicating that the copper ion adsorption of the resin in the first column is close to saturation. Close the first valve, the second valve, the eleventh valve and the sixth valve, open the fourth valve, the fifth valve, the twelfth valve and the ninth valve, and the raw water enters the second column through the first pump, T1, the fourth valve and the second upper pipe, passes through the resin layer in the second column, enters the third column through the second lower pipe, the fifth valve, T2, the twelfth valve and the third upper pipe, and then passes through the resin layer of the third column, and is discharged to the after-hand water treatment system through the third lower pipe, the ninth valve and T4; at this time, the system switches to the second column and the third column in series and downstream operation;

[0155] 3. Countercurrent circulation saturation of the resin in the first column: When the first valve, the second valve, the eleventh valve and the sixth valve are closed in step 2, pump 2 is started, the thirteenth valve and the fourteenth valve are opened, and the raw water enters the first column through the fourteenth valve and the first lower pipe, and then enters the raw water pool through the first upper pipe, the thirteenth valve and T3, and performs countercurrent circulation, so that the unsaturated part of the resin continues to adsorb copper ions until it is completely saturated. As the resin saturation increases, the color detection value C of T3 increases. 3 Gradually rising, when M 2 =(C 3 -C 1 ) / C 1 ≦B, indicating that the resin in column 1 is completely saturated, the circulation is over, pump 2 is stopped, and valve 14 is closed.

[0156] 4. Resin cleaning in the first column before raw water recovery and regeneration: When in step 3, while the 14th valve is closed, the 20th valve is opened, and the column washing water enters the first column at a set flow rate through the 20th valve and the first lower connecting pipe. The raw water in the first column is pushed out by the column washing water and returns to the raw water tank for recovery through the first upper connecting pipe, the 13th valve, and T3. When the inflow of the column washing water reaches the set amount, all the raw water in the first column is pushed out by the column washing water, the 13th valve is closed, and the 23rd valve is opened. The column washing water continues to clean the resin in a countercurrent manner, and the column washing wastewater is discharged into the column washing wastewater treatment system through the first upper connecting pipe, the 23rd valve, and T5. When the inflow of the column washing water reaches the set amount, the supply of the column washing water stops, the 23rd valve is closed, and after the resin in the first column is thoroughly cleaned, the next step of regeneration begins;

[0157] 5. Resin regeneration in the first column: When the 23rd valve is closed in step 4 and the 21st valve is opened, the regenerant (sulfuric acid, the same below) enters the first column through the 20th valve and the first lower connecting pipe. The copper ions adsorbed by the resin are continuously desorbed by the regenerant and become the regenerated liquid containing copper sulfate. The regenerated liquid in the first column goes to the regenerated liquid treatment system through the first upper connecting pipe, the 21st valve, and T6. When the amount of the regenerant entering the first column reaches the set amount, the supply of the regenerated liquid stops, and the column washing water enters the first column through the 20th valve and the first lower connecting pipe, and pushes the regenerated liquid in the first column into the regenerated liquid treatment system through the first upper connecting pipe, the 21st valve, and T6. When the color degree value of T6 < C, it indicates that most of the regenerated liquid in the first column has been pushed out by the column washing water. At this time, the 21st valve is closed, the 23rd valve is opened, and the column washing water goes to the column washing wastewater treatment system through the first upper connecting pipe, the 23rd valve, and T5 to clean the resin in a countercurrent manner. When the inflow of the column washing water reaches the set amount, the 20th valve and the 23rd valve are closed, the 19th valve and the 22nd valve are opened, and the column washing water enters the first column through the 19th valve and the first upper connecting pipe, and then goes to the column washing wastewater treatment system through the first lower connecting pipe, the 22nd valve, and T5 to clean the resin in a co-current manner. When the detected pH value of T5 ≥ D, the supply of the column washing water stops, the 19th valve and the 22nd valve are closed, and the resin regeneration and cleaning are completed. The first column waits for the next switch;

[0158] 6. Series column switching 2: When in step 2, the second column and the third column are in series operation until M 1 ≤ A, it indicates that the resin in the second column adsorbing copper ions in the raw water is approaching saturation. The 4th valve, the 5th valve, the 12th valve, and the 9th valve are closed, and the 7th valve, the 8th valve, the 10th valve, and the 3rd valve are opened. The raw water enters the third column through the first pump, T1, the 7th valve, and the third upper connecting pipe. After passing through the resin layer in the third column, it enters the first column through the third lower connecting pipe, the 8th valve, T2, the 10th valve, and the first upper connecting pipe. After passing through the resin layer in the first column, it is discharged to the post-treatment water treatment system through the first lower connecting pipe, the 3rd valve, and T4. At this time, the system is switched to series co-current operation of the third column and the first column;

[0159] 7. Resin countercurrent circulation saturation in the second column: When the 4th, 5th, 12th and 9th valves are closed in step 6, pump 2 is started, valves 15 and 16 are opened, and raw water enters the second column through valve 16 and the second lower pipe, and then enters the raw water tank through the second upper pipe, valve 15 and T3 for countercurrent circulation. 2 ≦B,, indicating that the resin in the second column is completely saturated, the cycle is over, pump 2 is stopped, and valve 16 is closed;

[0160] 8. Recovery of raw water in the second column and cleaning of resin before regeneration: When the 16th valve is closed in step 7, the 25th valve is opened, and the column washing water enters the second column through the 25th valve and the second lower connecting pipe, and the raw water in the second column is pushed out by the column washing water and returned to the raw water pool for recovery through the second upper connecting pipe, the 15th valve and T3. When the column washing water inflow reaches the set amount, the raw water in the second column has been completely pushed out by the column washing water, the 15th valve is closed, the 28th valve is opened, and the column washing water continues to countercurrently wash the resin. The column washing wastewater is discharged into the column washing wastewater treatment system through the second upper connecting pipe, the 28th valve and T5. When the column washing water inflow reaches the set amount, the column washing water is stopped, the 28th valve is closed, and the resin in the second column is thoroughly cleaned before the next step of regeneration begins.

[0161] 9. Regeneration of resin in the second column: When the 28th valve in step 8 is closed and the 26th valve is opened, the quantitative regeneration agent enters the second column through the 25th valve and the second lower pipe at the set flow rate to regenerate the resin in the second column, and the regeneration liquid in the second column goes to the regeneration liquid treatment system through the second upper pipe, the 26th valve and T6; when the regeneration agent entering the second column reaches the set amount, stop feeding the regeneration agent, and the column washing water enters the second column through the 25th valve and the second lower pipe, and the regeneration liquid in the second column is pushed into the regeneration liquid treatment system through the second upper pipe, the 26th valve and T6. When the color value of T6 is ≦C, the second column is The 6th valve is closed, the 28th valve is opened, the column washing wastewater passes through the 2nd upper pipe, the 28th valve and T5 to the column washing wastewater treatment system, and the resin is washed in the countercurrent. When the column washing water inflow reaches the set amount, the 25th valve and the 28th valve are closed, the 24th valve and the 27th valve are opened, and the column washing water enters the second column through the 24th valve and the 2nd upper pipe, and then passes through the 2nd lower pipe, the 27th valve and T5 to the column washing wastewater treatment system, and the resin is washed in the downstream. When the detected pH value of T5 is ≧D, the column washing water stops inflowing, the 24th valve and the 27th valve are closed, the resin regeneration and washing are completed, and the second column waits for the next switch;

[0162] 10. Series column switching 3: When the third column and the first column in step 6 are operated in series to M 1 ≦A, indicating that the copper ions adsorbed by the resin in the third column in the raw water are close to saturation, close the 7th valve, the 8th valve, the 10th valve and the 3rd valve, and switch to the 1st and 2nd columns in series and run downstream according to step 1;

[0163] 11. Resin countercurrent circulation saturation in the third column: When the 7th, 8th, 10th and 3rd valves are closed in step 10, pump 2 is started, valves 17 and 18 are opened, and raw water enters the third column through valve 18 and the 3rd lower pipe, and then enters the raw water tank through the 3rd upper pipe, valve 17 and T3 for countercurrent circulation. 2 ≦B, indicating that the resin in the third column is completely saturated, the cycle is over, pump 2 is stopped, and valve 18 is closed;

[0164] 12. Recovery of raw water in the third column and cleaning of the resin before regeneration: When the 18th valve is closed in step 11, the 30th valve is opened, and the column washing water enters the third column through the 30th valve and the 3rd lower connecting pipe, and the raw water in the third column is pushed out by the column washing water and returned to the raw water pool for recovery through the 3rd upper connecting pipe, the 17th valve and T3. When the column washing water inflow reaches the set amount, the raw water in the third column has been completely pushed out by the column washing water, the 17th valve is closed, the 33rd valve is opened, and the column washing water continues to countercurrently wash the resin, and the column washing wastewater is discharged into the column washing wastewater treatment system through the 3rd upper connecting pipe, the 33rd valve and T5. When the column washing water inflow reaches the set amount, the column washing water is stopped, the 33rd valve is closed, and the resin in the third column is thoroughly cleaned before starting the next step of regeneration.

[0165] 13. Regeneration of resin in the third column: When the 33rd valve in step 12 is closed and the 31st valve is opened, the quantitative regeneration agent enters the third column through the 30th valve and the 3rd lower pipe at the set flow rate to regenerate the resin in the third column, and the regeneration liquid in the third column goes to the regeneration liquid treatment system through the 3rd upper pipe, the 31st valve and T6; when the regeneration agent entering the third column reaches the set amount, stop feeding the regeneration agent, and the column washing water enters the third column through the 30th valve and the 3rd lower pipe. The regeneration liquid in the third column is pushed into the regeneration liquid treatment system through the 3rd upper pipe, the 31st valve and T6. When the color value of T6 is ≦C, the third column is Valve 31 is closed, valve 33 is opened, column washing waste water passes through the 3rd upper pipe, valve 33 and T5 to the column washing waste water treatment system, and washes the resin in countercurrent. When the column washing water inflow reaches the set amount, valves 30 and 33 are closed, valves 29 and 32 are opened, column washing water enters the 3rd column through valve 29 and the 3rd upper pipe, and then passes through the 3rd lower pipe, valve 32 and T5 to the column washing waste water treatment system, and washes the resin downstream. When the detected pH value of T5 is ≧D, the column washing water stops inflowing, valves 29 and 32 are closed, resin regeneration and cleaning are completed, and column 3 waits for the next switch.

[0166] 14. Repeat steps 2-13.

[0167] 15. The chromaticity detection of T4 is to ensure that the nickel ion content in the water after delivery does not exceed the standard. Once the T4 detection value exceeds the set value, the series columns will switch according to steps 2, 6, and 10 and continue to run according to the subsequent steps.

[0168] The foregoing description of specific exemplary embodiments of the present invention is for the purpose of illustration and demonstration. These descriptions are not intended to limit the present invention to the precise form disclosed, and it is clear that many changes and variations can be made based on the above teachings. The purpose of selecting and describing the exemplary embodiments is to explain the specific principles of the present invention and its practical application, so that those skilled in the art can realize and utilize various different exemplary embodiments of the present invention and various different selections and changes. The scope of the present invention is intended to be limited by the claims and their equivalents.

Claims

1. A continuous series operation and circulating saturated ion exchange system, comprising two sets of pumps, T1-T6 online detectors, valves 1 to 33 and three ion exchange columns connected by pipelines, characterized in that: The raw water pool is connected to the upper part of the first ion exchange column through the first pump, T1 online detector, pipeline, the first valve and the first upper pipe, the bottom of the first column is connected to the upper part of the second ion exchange column through the first lower pipe, the second valve, T2 online detector, pipeline, the 11th valve and the second upper pipe, and the bottom of the second column is connected to the post-exchange water treatment system through the second lower pipe, the sixth valve, T4 online detector and pipeline; The raw water pool is connected to the upper part of the second column through the first pump, T1, pipeline, the fourth valve and the second upper pipe; the bottom of the second column is connected to the upper part of the third ion exchange column through the second lower pipe, the fifth valve, T2, pipeline, the twelfth valve and the third upper pipe, and the bottom of the third column is connected to the post-exchange water treatment system through the third lower pipe, the ninth valve, T4 and pipeline; The raw water tank is connected to the upper part of the third column through the first pump, T1, pipeline, the seventh valve and the third upper pipe; the bottom of the third column is connected to the upper part of the first column through the third lower pipe, the eighth valve, T2, pipeline, the tenth valve and the first upper pipe, and the bottom of the first column is connected to the post-delivery water treatment system through the first lower pipe, valve 3, T4 and pipeline; The raw water tank is connected to the bottom of the first column through the second pump, pipeline, 14th valve and the first lower connecting pipe, and the upper part of the first column is connected to the raw water tank through the first upper connecting pipe, 13th valve, T3 and pipeline; The raw water tank is connected to the bottom of the second column through the second pump, pipeline, 16th valve and the second lower connecting pipe, and the upper part of the second column is connected to the raw water tank through the second upper connecting pipe, 15th valve, T3 and pipeline; The raw water tank is connected to the bottom of the third column through the second pump, pipeline, 18th valve and the third lower pipe, and the upper part of the third column is connected to the raw water tank through the third upper pipe, 17th valve, T3 and pipeline; The regeneration agent, transformation agent or countercurrent column washing water is connected to the first column through the pipeline, the 20th valve and the first lower connecting pipe, the downstream column washing water is connected to the first column through the pipeline, the 19th valve and the first upper connecting pipe, the liquid after resin regeneration passes through the first upper connecting pipe, the 21st valve, the pipeline and the T6 de-regeneration liquid treatment system, the liquid after resin transformation and the countercurrent column washing wastewater pass through the first upper connecting pipe, the 23rd valve, the pipeline and the T5 de-washing column wastewater treatment system, and the downstream column washing wastewater passes through the first lower connecting pipe, the 22nd valve, the pipeline and the T5 de-washing column wastewater treatment system; The regeneration agent, transformation agent or countercurrent column washing water is connected to the second column through the pipeline, the 25th valve and the second lower connecting pipe, the downstream column washing water is connected to the second column through the pipeline, the 24th valve and the second upper connecting pipe, the resin regeneration liquid passes through the second upper connecting pipe, the 26th valve, the pipeline and the T6 de-regeneration liquid treatment system, the resin transformation liquid and the countercurrent column washing wastewater pass through the second upper connecting pipe, the 28th valve, the pipeline and the T5 de-washing column wastewater treatment system, and the downstream column washing wastewater passes through the second lower connecting pipe, the 27th valve, the pipeline and the T5 de-washing column wastewater treatment system; The regeneration agent, transformation agent or countercurrent column washing water is connected to the third column through the pipeline, the 30th valve and the 3rd lower pipe, the downstream column washing water is connected to the third column through the pipeline, the 29th valve and the 3rd upper pipe, the resin regeneration liquid passes through the 3rd upper pipe, the 31st valve, the pipeline and the T6 de-regeneration liquid treatment system, the resin transformation liquid and the countercurrent column washing wastewater pass through the 3rd upper pipe, the 33rd valve, the pipeline and the T5 de-washing column wastewater treatment system, and the downstream column washing wastewater passes through the 3rd lower pipe, the 32nd valve, the pipeline and the T5 de-washing column wastewater treatment system; The raw water in the raw water pool enters the upper part of the first column through the first pump, pipeline, TI, the first valve and the first upper pipe; through the resin layer in the first column, through the first lower pipe connected to the bottom of the first column, the second valve, T2, pipeline, the 11th valve and upper pipe 2, enters the upper part of the second column; then through the resin layer in the second column, through the second lower pipe connected to the bottom of the second column, the sixth valve, T4 and pipeline, it is discharged to the post-handling water treatment system; The raw water in the raw water pool enters the upper part of the second column through the first pump, pipeline, T1, the fourth valve and the second upper pipe, passes through the resin layer in the second column, and enters the upper part of the third column through the second lower pipe connected to the bottom of the second column, the fifth valve, T2, pipeline, the twelfth valve and the third upper pipe, and then passes through the resin layer in the third column, and is discharged to the post-handling water treatment system through the third lower pipe connected to the bottom of the third column, the ninth valve, T4 and pipeline; The raw water in the raw water pool enters the upper part of the third column through the first pump, pipeline, T1, the seventh valve and the third upper pipe, passes through the resin layer in the third column, enters the upper part of the first column through the third lower pipe connected to the bottom of the third column, the eighth valve, T2, pipeline, the tenth valve and the first upper pipe, and then passes through the resin layer in the first column, passes through the first lower pipe connected to the bottom of the first column, valve 3, T4 and pipeline to be discharged to the post-handling water treatment system; The raw water from the raw water pool enters the bottom of the first column through the second pump, pipeline, 14th valve and the first lower pipe, passes through the resin layer in the first column, and enters the raw water pool through the first upper pipe, 13th valve, T3 and pipeline; The raw water from the raw water pool enters the bottom of the second column through the second pump, pipeline, 16th valve and the second lower pipe, passes through the resin layer in the second column, and enters the raw water pool through the second upper pipe, 15th valve, T3 and pipeline; The raw water from the raw water pool enters the bottom of the third column through the second pump, pipeline, 18th valve and the third lower pipe, passes through the resin layer in the third column, and enters the raw water pool through the third upper pipe, 17th valve, T3 and pipeline; The regeneration agent enters the first column through the pipeline, the 20th valve and the 1st lower pipe, and the resin regeneration liquid passes through the 21st valve, the pipeline and the T6 de-regeneration liquid treatment system; the transformation agent enters the first column through the pipeline, the 20th valve and the 1st lower pipe, and the resin transformation liquid passes through the 1st upper pipe, the 23rd valve, the pipeline and the T5 de-washing column wastewater treatment system; the downstream washing column water enters the first column through the pipeline, the 19th valve and the 1st upper pipe, and the countercurrent washing column water enters the first column through the pipeline, the 20th valve and the 1st lower pipe, the downstream washing column wastewater passes through the 1st lower pipe, the 22nd valve, the pipeline and the T5 de-washing column wastewater treatment system, and the countercurrent washing column wastewater passes through the 1st upper pipe, the 23rd valve, the pipeline and the T5 de-washing column wastewater treatment system; The regeneration agent enters the second column through the pipeline, the 25th valve and the second lower connection pipe, and the resin regeneration liquid passes through the 26th valve, the pipeline and the T6 de-regeneration liquid treatment system; the transformation agent enters the second column through the pipeline, the 25th valve and the second lower connection pipe, and the resin transformation liquid passes through the second upper connection pipe, the 28th valve, the pipeline and the T5 de-washing column wastewater treatment system; the downstream washing column water enters the second column through the pipeline, the 24th valve and the second upper connection pipe, and the countercurrent washing column water enters the second column through the 25th valve and the second lower connection pipe, the downstream washing column wastewater passes through the second lower connection pipe, the 27th valve, the pipeline and the T5 de-washing column wastewater treatment system, and the countercurrent washing column wastewater passes through the second upper connection pipe, the 28th valve, the pipeline and the T5 de-washing column wastewater treatment system; The regeneration agent enters the third column through the pipeline, the 30th valve and the 3rd lower connecting pipe, and the resin regeneration liquid passes through the 31st valve, the pipeline and the T6 regeneration liquid treatment system; the transformation agent enters the third column through the pipeline, the 30th valve and the 3rd lower connecting pipe, and the resin transformation liquid passes through the 3rd upper connecting pipe, the 33rd valve, the pipeline and the T5 de-washing column wastewater treatment system; the downstream column washing water enters the third column through the pipeline, the 29th valve and the 3rd upper connecting pipe, and the countercurrent column washing water enters the third column through the 30th valve and the 3rd lower connecting pipe, the downstream column washing wastewater passes through the 3rd lower connecting pipe, the 32nd valve, the pipeline and the T5 de-washing column wastewater treatment system, and the countercurrent column washing wastewater passes through the 3rd upper connecting pipe, the 33rd valve, the pipeline and the T5 de-washing column wastewater treatment system.

2. The continuous series operation and circulating saturated ion exchange system according to claim 1 is characterized in that: The system consists of 4 subsystems: a double-column alternating series continuous operation system consisting of the 1st pump, the 1st valve-9 and the corresponding pipelines; an online detection system consisting of online detectors T1-T6, 10-12 valves and corresponding pipelines; a countercurrent circulation saturation system consisting of the 2nd pump, the 13th valve-18th valve and the corresponding pipelines; a resin regeneration and cleaning system consisting of the 19th valve-33rd valve and the corresponding pipelines.

3. A continuous series operation and circulating saturated ion exchange system, characterized in that: The first column, the second column and the third column are equipped with different resins according to the different targets contained in the raw water for recovery or removal. The operation principles and steps are as follows: Step 1 starts operation: the first pump starts, the first valve, the second valve, the eleventh valve, and the sixth valve are opened, and the raw water in the raw water pool enters the first column through the first pump, T1, the first valve, and the first upper pipe at a set flow rate, passes through the resin layer in the first column, and then enters the second column through the first lower pipe, the second valve, T2, the eleventh valve, and the second upper pipe; after passing through the resin layer of the second column, it is discharged through the second lower pipe, the sixth valve, and T4 to become the post-delivery water to the post-delivery water treatment system. At this time, the system is a series connection of the first column and the second column. The target in the raw water is first adsorbed by the resin in the first column, and the target that is not completely adsorbed by the resin in the first column or the target that leaks out of the first column is continuously adsorbed by the resin in the second column to ensure that the content of the target in the water after delivery does not exceed the specified value, thereby ensuring its recovery or removal rate. During operation, the target content in the raw water is first detected by the online detector T1. After the raw water passes through the first column, the target content in the raw water is detected by the online monitor T2 before entering the second column. As more and more target substances are adsorbed by the resin in the first column, its saturation gradually increases, and the raw water The target substances that are not adsorbed or leaked out also gradually increase, so the detection value C2 of T2 rises and gradually approaches the detection value C1 of T1. When the ratio of C2 / C1 or (C1-C2) / C1 reaches the specified value M1, and the M1 value is 0.5-1.0 or 0.5-0, it indicates that the resin in the first column is close to saturation. The setting of the M1 value needs to be determined according to the content of the target substance in the raw water, the time required for the resin cycle saturation, and the time required for the resin regeneration and cleaning; the online detection and control principles of the second column and the third column, and the third column and the first column in series operation in the subsequent steps are the same; Step 2 Series column switching 1: When the 1st column and the 2nd column in step 1 are operated in series until the M1 value reaches the set value, indicating that the resin in the 1st column is close to saturation in adsorbing the target substance in the raw water, the 1st valve, the 2nd valve, the 11th valve and the 6th valve are closed, and the 4th valve, the 5th valve, the 12th valve and the 9th valve are opened. The raw water enters the 2nd column through the 1st pump, T1, the 4th valve and the 2nd upper pipe, passes through the resin layer in the 2nd column, enters the 3rd column through the 2nd lower pipe, the 5th valve, T2, the 12th valve and the 3rd upper pipe, and then passes through the resin layer of the 3rd column, and is discharged to the after-handling water treatment system through the 3rd lower pipe and the 9th valve; at this time, the system switches to the 2nd column and the 3rd column in series and downstream operation; Step 3: Resin countercurrent circulation saturation in the first column: When the first valve, the second valve, the eleventh valve and the sixth valve are closed in step 2, the second pump is started, the thirteenth valve and the fourteenth valve are opened, and the raw water passes through the fourteenth valve at a set flow rate, enters the first column through the first lower pipe, and then returns to the raw water pool from the first upper pipe, the thirteenth valve and T3 and is tested by T3 for the target substance content in the water, and performs a countercurrent circulation to fully saturate the resin in the first column that is close to saturation. In this process, the target substance completely replaces other non-target adsorbents adsorbed on the resin, so as to obtain high purity through subsequent resin regeneration. In addition, due to the complete saturation of the resin, the resin utilization rate reaches the maximum, which prolongs the regeneration cycle of the resin and reduces the operating cost. In the countercurrent saturation process, as the resin saturation degree increases, the detection value C3 of T3 gradually increases. When the ratio of C3 / C1 or (C1-C2) / C1 reaches the specified value M2, the M2 value is 0.9-1.0 or 0.1-0, when the M2 value reaches the set value, it indicates that the resin is fully saturated, the cycle ends, the second pump stops, and the 14th valve is closed. In the subsequent steps, the countercurrent circulation and detection control principles of the second column and the third column are the same. Step 4: Recovery of raw water in the first column and cleaning of resin before regeneration: a) When it is necessary to control the content of components in the raw water, in step 3, while closing valve No. 14, valve No. 20 is opened, and column washing water enters the first column through valve No. 20 and the first lower connecting pipe at a set flow rate, and the raw water in the first column is pushed out by the column washing water and returned to the raw water pool for recovery through the first upper connecting pipe, valve No. 13 and T3. When the column washing water inflow reaches the set amount, the raw water in the first column is completely pushed out by the column washing water, valve No. 13 is closed, valve No. 23 is opened, and column washing water continues to countercurrently wash the resin, and column washing waste water is discharged into column washing waste water through the first upper connecting pipe, valve No. 23 and T5. Treatment system, when the column washing water inflow reaches the set amount, the column washing water is stopped, and the resin in the first column is thoroughly cleaned before the next regeneration begins; b) when there is no need to control the content of the components in the raw water, in step 3, while the 14th valve is closed, the 20th valve is opened, and the column washing water enters the first column through the 20th valve and the first lower pipe at a set flow rate to clean the resin in the first column, and the column washing wastewater returns to the raw water pool through the first upper pipe, the 13th valve and T3. When the column washing water inflow reaches the set amount, the column washing water is stopped, the 13th valve is closed, and the resin in the first column is thoroughly cleaned before the next regeneration begins; Step 5 Regeneration of resin in the first column: a) When it is necessary to control the content of the target substance in the regeneration liquid, the 23rd valve is opened, and the quantitative regeneration agent enters the first column through the 20th valve and the first lower pipe at a set flow rate to regenerate the resin in the first column. The wash water in the first column is pushed out by the regeneration liquid through the first upper pipe, the 23rd valve and T5 and is detected by T5 before going to the wash water treatment system. When the detection value of T5 reaches the set value, it means that the wash water in the first column has been completely pushed out by the regeneration liquid. The 23rd valve is closed, the 21st valve is opened, and the regeneration liquid in the first column goes to the regeneration liquid treatment system from the first upper pipe, the 21st valve and T6; b) When it is not necessary to control the content of the target substance in the regeneration liquid, the 21st valve is opened, and the quantitative regeneration agent enters the first column through the 20th valve and the first lower pipe at a set flow rate to regenerate the resin in the first column. The regeneration liquid in the first column goes to the regeneration liquid treatment system from the first upper pipe, the 21st valve and T6; When the regeneration agent entering the first column reaches the set amount, stop feeding the regeneration agent, and the column washing water enters the first column again through the 20th valve and the first lower pipe, and pushes the regeneration liquid in the first column out from the first upper pipe, the 21st valve and T6, and is discharged into the regeneration liquid treatment system after being detected by T6. As the column washing water continuously pushes the regeneration liquid in the first column out, the T6 detection value keeps changing. When the T6 detection value reaches the set value, it indicates that the regeneration liquid has been completely pushed out by the column washing water. The 21st valve is closed, the 23rd valve is opened, and the column washing wastewater is sent to the column washing wastewater treatment system through the first upper pipe, the 23rd valve and T5, and the tree continues to be cleaned. The resin is washed in the countercurrent mode. When the column washing water inflow reaches the set amount, the 20th valve and the 23rd valve are closed, the 19th valve and the 22nd valve are opened, and the column washing water enters the first column through the 19th valve and the upper pipe, and then passes through the first lower pipe, the 22nd valve and T5 and is detected by T5 before going to the column washing wastewater treatment system to wash the resin in the downstream mode. When the detection value of T5 reaches the set value, the resin washing in the first column is completed, the column washing water stops inflowing, the 19th valve and the 22nd valve are closed, and the resin regeneration and washing are completed; the detection and control principles of the resin regeneration and washing in the second and third columns in the subsequent steps are the same; Step 6 Resin transformation in the first column: When the 19th valve and the 22nd valve in step 5 are closed, the 20th valve and the 23rd valve are opened, and the quantitative transformation agent enters the first column through the 20th valve and the first lower pipe at a set flow rate to transform the resin in the first column. The transformation liquid passes through the first upper pipe, the 23rd valve and T5 to the column washing wastewater treatment system. After the transformation agent enters the first column to reach the set amount, the transformation agent is stopped, and the column washing water enters the first column through the 20th valve and the first lower pipe, and then passes through the first upper pipe, the 23rd valve and T5 to the column washing wastewater treatment system. When the column washing water inflow reaches the set amount, the 20th valve is closed. and the 23rd valve is closed, the 19th valve and the 22nd valve are opened, the column washing water enters the 1st column through the 19th valve and the upper pipe, and then passes through the 1st lower pipe, the 22nd valve and T5 and is detected by T5 before going to the column washing wastewater treatment system. When the detection value of T5 reaches the set value, the resin washing in the 1st column is completed, the column washing water stops entering, the 19th valve and the 22nd valve are closed, and the resin transformation and cleaning are completed. This step is omitted for resins that do not need transformation; after the resin regeneration, transformation and cleaning are completed, the 1st column waits for the next switch; the detection and control principles of the transformation and cleaning of the 2nd and 3rd columns in the subsequent steps are the same; Step 7 Series column switching 2: When the second column and the third column in step 2 are operated in series until the M1 value reaches the set value, indicating that the resin in the second column is close to saturation in adsorbing the target substance in the raw water, the fourth valve, the fifth valve, the twelfth valve and the ninth valve are closed, and the seventh valve, the eighth valve, the tenth valve and the valve 3 are opened. The raw water enters the third column through the first pump, T1, the seventh valve and the third upper pipe, passes through the resin layer in the third column, enters the first column through the third lower pipe, the eighth valve, T2, the tenth valve and the first upper pipe, and then passes through the resin layer of the first column, and is discharged to the after-hand water treatment system through the first lower pipe and valve 3; at this time, the system switches to the third column and the first column in series and downstream operation; Step 8: Countercurrent circulation saturation of the resin in the second column: When the 4th, 6th, 12th and 9th valves are closed in step 7, the 2nd pump is started, the 15th and 16th valves are opened, and the raw water enters the second column through the 16th valve and the 2nd lower pipe, and then enters the raw water tank from the 2nd upper pipe, the 15th valve and T3 and after the target content in the water is detected by T3, it is circulated in the countercurrent. When the M2 value reaches the set value, the resin in the second column is completely saturated, the cycle ends, the 2nd pump is stopped, and the 16th valve is closed; Step 9: Recovery of raw water in the second column and cleaning of resin before regeneration: a) When it is necessary to control the content of components in the raw water, in step 8, while closing valve No. 16, valve No. 25 is opened, and column washing water enters the second column through valve No. 25 and the second lower connecting pipe, and the raw water in the second column is pushed out by the column washing water and returned to the raw water tank for recycling through the second upper connecting pipe, valve No. 15 and T3. When the column washing water inflow reaches the set amount, the raw water in the second column has been completely pushed out by the column washing water, valve No. 15 is closed, valve No. 28 is opened, and column washing water continues to countercurrently wash the resin, and column washing waste water is discharged into the column washing waste tank through the second upper connecting pipe, valve No. 28 and T5. Water treatment system, when the column washing water inflow reaches the set amount, the column washing water is stopped, and the resin in the second column is thoroughly cleaned before the next regeneration begins; b) when there is no need to control the content of the components in the raw water, in step 8, while the 16th valve is closed, the 25th valve is opened, and the column washing water enters the second column through the 25th valve and the second lower pipe to clean the resin in the second column, and the column washing wastewater returns to the raw water tank through the second upper pipe, the 15th valve and T3. When the column washing water inflow reaches the set amount, the column washing water is stopped, the 15th valve is closed, and the resin in the second column is thoroughly cleaned before the next regeneration begins; Step 10 Regeneration of resin in the second column: a) When it is necessary to control the content of the target substance in the regeneration liquid, the 28th valve is opened, and the quantitative regeneration agent enters the second column through the 25th valve and the second lower pipe at a set flow rate to regenerate the resin in the second column. The regeneration liquid pushes out the column washing water in the second column and passes through the second upper pipe, the 28th valve and T5 to the column washing water treatment system. When the detection value of T5 reaches the set value, the column washing water in the second column has been completely pushed out by the regeneration liquid, the 28th valve is closed, the 26th valve is opened, and the regeneration liquid in the second column passes through the second upper pipe, the 26th valve and T6 to the regeneration liquid treatment system; b) When it is not necessary to control the content of the target substance in the regeneration liquid, the 26th valve is opened, and the quantitative regeneration agent enters the second column through the 25th valve and the second lower pipe at a set flow rate to regenerate the resin in the second column, and the regeneration liquid in the second column passes through the second upper pipe, the 26th valve and T6 to the regeneration liquid treatment system; When the regeneration agent entering the second column reaches the set amount, stop feeding the regeneration agent, and the column washing water enters the second column again through the 25th valve and the second lower pipe, and the regeneration liquid in the second column is pushed into the regeneration liquid treatment system through the second upper pipe, the 26th valve and T6. When the detection value of T6 reaches the set value, the 26th valve is closed, the 28th valve is opened, and the column washing wastewater is sent to the column washing wastewater treatment system through the second upper pipe, the 28th valve and T5. When the column washing water inflow reaches the set amount, the 25th valve and the 28th valve are closed, the 24th valve and the 27th valve are opened, and the column washing water enters the second column through the 24th valve and the second upper pipe, and then goes to the column washing wastewater treatment system through the second lower pipe, the 27th valve and T5. When the detection value of T5 reaches the set value, the column washing water stops inflowing, the 24th valve and the 27th valve are closed, and the resin regeneration and cleaning are completed; Step 11: Resin transformation in the second column: When the 24th and 27th valves in step 10 are closed, the 25th and 28th valves are opened, and the quantitative transformation agent enters the second column through the 25th valve and the second lower pipe at a set flow rate to transform the resin in the second column. The transformation liquid passes through the second upper pipe, the 28th valve and T5 to the column washing wastewater treatment system. After the transformation agent enters the second column to reach the set amount, the transformation agent is stopped, and the column washing water enters the second column through the 25th valve and the second lower pipe, and then passes through the second upper pipe, the 28th valve and T5 to the column washing wastewater treatment system. When the column washing water inflow reaches the set amount, the 25th valve and the 28th valve are closed, the 24th valve and the 27th valve are opened, and the column washing wastewater enters the second column through the 24th valve and the second upper pipe, and then passes through the second lower pipe, the 27th valve and the T5 to the column washing wastewater treatment system. When the detection value of T5 reaches the set value, the column washing water stops inflow, the 24th valve and the 27th valve are closed, and the resin transformation and cleaning are completed; after the resin regeneration, transformation and cleaning are completed, the second column waits for the next switch; Step 12: Switching columns in series 3: When the M1 value of the third column and the first column in step 7 reaches the set value, indicating that the resin in the third column is close to saturation in adsorbing the target substance in the raw water, close the seventh valve, the eighth valve, the tenth valve and the valve 3, and switch to the first column and the second column in series to run downstream according to step 1; Step 13: saturation of the resin in the third column by countercurrent circulation: while the 7th, 8th, 10th and 3rd valves are closed in step 12, the 2nd pump is started, the 17th and 18th valves are opened, the raw water enters the 3rd column through the 18th valve and the 3rd lower pipe, and then enters the raw water pool from the 3rd upper pipe, the 17th valve and T3 and after the target substance content in the water is detected by T3, the countercurrent circulation is performed. When the M2 value reaches the set value, the resin in the 3rd column is completely saturated, the circulation ends, the 2nd pump is stopped, and the 18th valve is closed; Step 14: Recovery of raw water in the third column and cleaning of resin before regeneration: a) When it is necessary to control the content of components in the raw water, in step 13, while closing valve 18, valve 30 is opened, column washing water begins to flow in, and enters the third column through valve 30 and the third lower pipe, and the raw water in the third column returns to the raw water pool through the third upper pipe, valve 17 and T3. When the column washing water inflow reaches the set amount, the raw water in the second column has been completely pushed out by the column washing water, valve 17 is closed, valve 33 is opened, and the column washing water continues to countercurrently wash the resin, and the column washing wastewater is discharged into the column washing wastewater treatment through the third upper pipe, valve 33 and T5. a) when the column washing water inflow reaches the set amount, the column washing water is stopped, and the resin in the third column is thoroughly cleaned before the next regeneration is started; b) when it is not necessary to control the content of the components in the raw water, in step 13, while the 18th valve is closed, the 30th valve is opened, and the column washing water enters the third column through the 30th valve and the third lower pipe to clean the resin in the third column, and the column washing wastewater returns to the raw water tank through the third upper pipe, the 17th valve and T3, and when the column washing water inflow reaches the set amount, the column washing water is stopped, the 17th valve is closed, and the resin in the third column is thoroughly cleaned before the next regeneration is started; Step 15 Regeneration of resin in the third column: a) When it is necessary to control the content of the target substance in the regeneration liquid, the 33rd valve is opened, and the quantitative regeneration agent enters the third column through the 30th valve and the third lower pipe at a set flow rate, and the column washing water in the third column passes through the third upper pipe, the 33rd valve and T5 to the column washing water treatment system. When the detection value of T5 reaches the set value, the 33rd valve is closed, the 31st valve is opened, and the regeneration liquid in the third column passes through the third upper pipe, the 31st valve and T6 to the regeneration liquid treatment system; b) When it is not necessary to control the content of the target substance in the regeneration liquid, the 31st valve is opened, and the quantitative regeneration agent enters the third column through the 31st valve and the third lower pipe at a set flow rate to regenerate the resin in the third column, and the regeneration liquid in the third column passes through the third upper pipe, the 31st valve and T6 to the regeneration liquid treatment system; When the regeneration agent entering the third column reaches the set amount, stop feeding the regeneration agent, and the column washing water enters the third column again through the 30th valve and the 3rd lower pipe, and the regeneration liquid in the third column is pushed into the regeneration liquid treatment system through the 3rd upper pipe, the 31st valve and T6. When the detection value of T6 reaches the set value, the 31st valve is closed, the 33rd valve is opened, and the column washing wastewater goes to the column washing wastewater treatment system through the 3rd upper pipe, the 33rd valve and T5. When the column washing water inflow reaches the set amount, the 30th valve and the 33rd valve are closed, the 29th valve and the 32nd valve are opened, and the column washing water enters the third column through the 29th valve and the 3rd upper pipe, and then goes to the column washing wastewater treatment system through the 3rd lower pipe, the 32nd valve and T5. When the detection value of T5 reaches the set value, the column washing water stops inflowing, the 29th valve and the 32nd valve are closed, and the resin regeneration and cleaning are completed; Step 16: Resin transformation in the third column: When the 29th valve and the 32nd valve in step 15 are closed, the 30th valve and the 33rd valve are opened, and the quantitative transformation agent enters the third column through the 30th valve and the 3rd lower pipe at a set flow rate to transform the resin in the third column. The transformation liquid passes through the 3rd upper pipe, the 33rd valve and T5 to the column washing wastewater treatment system. After the transformation agent enters the third column to reach the set amount, the transformation agent is stopped, and the column washing water enters the third column through the 30th valve and the 3rd lower pipe, and then passes through the 3rd upper pipe, the 33rd valve and T5 to the column washing wastewater treatment system. When the column washing water inflow reaches the set amount, the 30th valve and the 33rd valve are closed, the 29th valve and the 32nd valve are opened, and the column washing wastewater enters the 3rd column through the 29th valve and the 3rd upper pipe, and then passes through the 3rd lower pipe, the 32nd valve and the T5 to the column washing wastewater treatment system. When the detection value of T5 exceeds the set value, the column washing water stops inflow, the 29th valve and the 32nd valve are closed, and the resin transformation and cleaning are completed; after the resin regeneration, transformation and cleaning are completed, the 3rd column waits for the next switch; Step 17 repeats step 2 to step 16 to achieve continuous operation of the system; Step 18: After the raw water has been adsorbed by the series column to remove the target substance, the post-delivery water is tested by the online detector T4 and then discharged into the post-delivery treatment system. T4 is set to ensure that the target substance content in the post-delivery water does not exceed the set value. Through online detection of T1 and T2 and control according to the set M1 value, the normal and continuous operation of the system can be guaranteed. However, in abnormal conditions, including but not limited to water quality exceeding the normal range, M1 value set too high or too low, partial resin failure or poor regeneration, or equipment failure, the T4 detection value will exceed the set value. Once the T4 value exceeds the standard, the resin column needs to be switched, the process parameters and operating procedures adjusted, or troubleshooting operations performed.

4. A continuous series operation and circulating saturated ion exchange system, mainly composed of two groups of pumps, T1-T6 online detectors, 1-31 valves and three ion exchange columns connected by pipelines, characterized in that: The raw water tank is connected to the upper part of the first column through the first pump, T1, pipeline, the first valve and the first upper pipe, the bottom of the first column is connected to the upper part of the second column through the first lower pipe, the second valve, T2, pipeline, the 11th valve and the second upper pipe, and the bottom of the second column is connected to the post-delivery water treatment system through the second lower pipe, the sixth valve, T4 and pipeline; The raw water tank is connected to the upper part of the second column through the first pump, T1, pipeline, the fourth valve and the second upper pipe; the bottom of the second column is connected to the upper part of the third column through the second lower pipe, the fifth valve, T2, pipeline, the twelfth valve and the third upper pipe, and the bottom of the third column is connected to the post-delivery water treatment system through the third lower pipe, the ninth valve, T4 and pipeline; The raw water tank is connected to the upper part of the third column through the first pump, T1, pipeline, the seventh valve and the third upper pipe; the bottom of the third column is connected to the upper part of the first column through the third lower pipe, the eighth valve, T2, pipeline, the tenth valve and the first upper pipe, and the bottom of the first column is connected to the post-delivery water treatment system through the first lower pipe, valve 3, T4 and pipeline; The raw water tank is connected to the bottom of the first column through the second pump, pipeline, 14th valve and the first lower connecting pipe, and the upper part of the first column is connected to the raw water tank through the first upper connecting pipe, 13th valve, T3 and pipeline; The raw water tank is connected to the bottom of the second column through the second pump, pipeline, 16th valve and the second lower connecting pipe, and the upper part of the second column is connected to the raw water tank through the second upper connecting pipe, 15th valve, T3 and pipeline; The raw water tank is connected to the bottom of the third column through the second pump, pipeline, 18th valve and the third lower pipe, and the upper part of the third column is connected to the raw water tank through the third upper pipe, 17th valve, T3 and pipeline; The regeneration agent, transformation agent or countercurrent column washing water is connected to the first column through the pipeline, the 30th valve, the pipeline, the 20th valve and the first lower connecting pipe, the downstream column washing water is connected to the first column through the pipeline, the 31st valve, the pipeline, the 19th valve and the first upper connecting pipe, the resin regeneration liquid passes through the first upper connecting pipe, the 21st valve, the pipeline and the T6 de-regeneration liquid treatment system, the resin transformation liquid and the countercurrent column washing wastewater pass through the first upper connecting pipe, the 19th valve, the pipeline, the 28th valve, the pipeline and the T5 de-washing column wastewater treatment system, and the downstream column washing wastewater passes through the first lower connecting pipe, the 20th valve, the pipeline, the 29th valve, the pipeline and the T5 de-washing column wastewater treatment system; The regeneration agent, transformation agent or countercurrent column washing water is connected to the second column through the pipeline, the 30th valve, the pipeline, the 23rd valve and the second lower connecting pipe, the downstream column washing water is connected to the second column through the pipeline, the 31st valve, the pipeline, the 22nd valve and the second upper connecting pipe, the resin regeneration liquid passes through the second upper connecting pipe, the 24th valve, the pipeline and the T6 de-regeneration liquid treatment system, the resin transformation liquid and the countercurrent column washing wastewater pass through the second upper connecting pipe, the 22nd valve, the pipeline, the 28th valve, the pipeline and the T5 de-washing column wastewater treatment system, and the downstream column washing wastewater passes through the first lower connecting pipe, the 23rd valve, the pipeline, the 29th valve, the pipeline and the T5 de-washing column wastewater treatment system; The regeneration agent, transformation agent or countercurrent column washing water is connected to the third column through the pipeline, the 30th valve, the pipeline, the 26th valve and the 3rd lower connecting pipe. The downstream column washing water is connected to the third column through the pipeline, the 31st valve, the pipeline, the 25th valve and the 3rd upper connecting pipe. The resin regeneration liquid passes through the 3rd upper connecting pipe, the 27th valve, the pipeline and the T6 regeneration liquid treatment system. The resin transformation liquid and countercurrent column washing wastewater pass through the 3rd upper connecting pipe, the 25th valve, the pipeline, the 28th valve, the pipeline and the T5 column washing wastewater treatment system. The downstream column washing wastewater passes through the 1st lower connecting pipe, the 26th valve, the pipeline, the 29th valve, the pipeline and the T5 column washing wastewater treatment system.

5. The continuous series operation and circulating saturated ion exchange system according to claim 4 is characterized in that: The pipeline connecting the 1st valve, the 10th valve, the 13th valve, the 19th valve and the 21st valve to the upper part of the 1st column is the 1st upper connecting pipe, and the pipeline connecting the 2nd valve, the 3rd valve, the 14th valve and the 20th valve to the bottom of the 1st column is the 1st lower connecting pipe; The pipeline connecting the 4th valve, the 11th valve, the 15th valve, the 22nd valve and the 24th valve to the upper part of the 2nd column is the 2nd upper connecting pipe, and the pipeline connecting the 5th valve, the 6th valve, the 16th valve and the 23rd valve to the bottom of the 2nd column is the 2nd lower connecting pipe; The pipeline connecting the 7th valve, the 12th valve, the 17th valve, the 25th valve and the 27th valve to the upper part of the 3rd column is the 3rd upper connecting pipe, and the pipeline connecting the 8th valve, the 9th valve, the 18th valve and the 26th valve to the bottom of the 3rd column is the 3rd lower connecting pipe.

6. The continuous series operation and circulating saturated ion exchange system according to claim 4, characterized in that: The raw water in the raw water pool enters the upper part of the first column through the first pump, pipeline, T1, the first valve and the first upper pipe; enters the upper part of the second column through the resin layer in the first column, the first lower pipe connected to the bottom of the first column, the second valve, T2, pipeline, the 11th valve and the upper pipe 2; then passes through the resin layer in the second column, the second lower pipe connected to the bottom of the second column, the sixth valve, T4 and the pipeline to be discharged to the post-handling water treatment system; The raw water in the raw water pool enters the upper part of the second column through the first pump, pipeline, T1, the fourth valve and the second upper pipe, passes through the resin layer in the second column, and enters the upper part of the third column through the second lower pipe connected to the bottom of the second column, the fifth valve, T2, pipeline, the twelfth valve and the third upper pipe, and then passes through the resin layer in the third column, and is discharged to the post-handling water treatment system through the third lower pipe connected to the bottom of the third column, the ninth valve, T4 and pipeline; The raw water in the raw water pool enters the upper part of the third column through the first pump, pipeline, T1, the seventh valve and the third upper pipe, passes through the resin layer in the third column, enters the upper part of the first column through the third lower pipe connected to the bottom of the third column, the eighth valve, T2, pipeline, the tenth valve and the first upper pipe, and then passes through the resin layer in the first column, passes through the first lower pipe connected to the bottom of the first column, valve 3, T4 and pipeline to be discharged to the post-handling water treatment system; The raw water from the raw water pool enters the bottom of the first column through the second pump, pipeline, 14th valve and the first lower pipe, passes through the resin layer in the first column, and enters the raw water pool through the first upper pipe, 13th valve, T3 and pipeline; The raw water from the raw water pool enters the bottom of the second column through the second pump, pipeline, 16th valve and the second lower pipe, passes through the resin layer in the second column, and enters the raw water pool through the second upper pipe, 15th valve, T3 and pipeline; The raw water from the raw water pool enters the bottom of the third column through the second pump, pipeline, 18th valve and the third lower pipe, passes through the resin layer in the third column, and enters the raw water pool through the third upper pipe, 17th valve, T3 and pipeline; The regeneration agent enters the first column through the pipeline, the 30th valve, the pipeline, the 20th valve and the 1st lower connection pipe, and the resin regeneration liquid passes through the 21st valve, the pipeline and the T6 regeneration liquid treatment system; the transformation agent enters the first column through the pipeline, the 30th valve, the pipeline, the 20th valve and the 1st lower connection pipe, and the resin transformation liquid passes through the 1st upper connection pipe, the 19th valve, the pipeline, the 28th valve, the pipeline and the T5 column washing wastewater treatment system; the downstream column washing water passes through the pipeline, The 31st valve, pipeline, 19th valve and the 1st upper connecting pipe enter the 1st column, the countercurrent column washing water enters the 1st column through the pipeline, 30th valve, pipeline, 20th valve and the 1st lower connecting pipe, the downstream column washing waste water passes through the 1st lower connecting pipe, 20th valve, pipeline, 29th valve, pipeline and T5 de-washing column waste water treatment system; the countercurrent column washing waste water passes through the 1st upper connecting pipe, 19th valve, pipeline, 28th valve, pipeline and T5 de-washing column waste water treatment system; The regeneration agent enters the second column through the pipeline, the 25th valve and the second lower pipe, and the liquid after resin regeneration passes through the 26th valve, pipeline and T6 de-regeneration liquid treatment system; the transformation agent enters the second column through the pipeline, the 25th valve and the second lower pipe, and the liquid after resin transformation passes through the second upper pipe, the 28th valve, pipeline and T5 de-washing column wastewater treatment system; the downstream washing column water enters the second column through the pipeline, the 31st valve, pipeline, the 22nd valve and the second upper pipe, and the countercurrent washing column water enters the second column through the pipeline, the 30th valve, pipeline, the 23rd valve and the second lower pipe, and the downstream washing column wastewater passes through the second lower pipe, the 23rd valve, pipeline, the 29th valve, pipeline and T5 de-washing column wastewater treatment system; the countercurrent washing column wastewater passes through the second upper pipe, the 22nd valve, pipeline, the 28th valve, pipeline and T5 de-washing column wastewater treatment system; The regeneration agent enters the third column through the pipeline, the 30th valve and the 3rd lower connecting pipe, and the liquid after resin regeneration passes through the 31st valve, the pipeline and the T6 de-regeneration liquid treatment system; the transformation agent enters the third column through the pipeline, the 30th valve and the 3rd lower connecting pipe, and the liquid after resin transformation passes through the 3rd upper connecting pipe, the 33rd valve, the pipeline and the T5 de-washing column wastewater treatment system; the downstream column washing water enters the third column through the pipeline, the 31st valve, the pipeline, the 25th valve and the 3rd upper connecting pipe, and the countercurrent column washing water enters the third column through the pipeline, the 30th valve, the pipeline, the 26th valve and the 3rd lower connecting pipe, and the downstream column washing wastewater passes through the 3rd lower connecting pipe, the 26th valve, the pipeline, the 29th valve, the pipeline and the T5 de-washing column wastewater treatment system; the countercurrent column washing wastewater passes through the 3rd upper connecting pipe, the 25th valve, the pipeline, the 28th valve, the pipeline and the T5 de-washing column wastewater treatment system.

7. The continuous series operation and circulating saturated ion exchange system according to claim 4 is characterized in that: The system consists of 4 subsystems: a double-column alternating series continuous operation system consisting of the 1st pump, the 1st valve-9 and the corresponding pipelines; an online detection system consisting of online detectors T1-T6, 10-12 valves and corresponding pipelines; a countercurrent circulation saturation system consisting of the 2nd pump, the 13th valve-18 and the corresponding pipelines; and a resin regeneration and cleaning system consisting of valves 19-33 and the corresponding pipelines.

8. A continuous series operation and circulating saturated ion exchange system, characterized in that: The first column, the second column and the third column are equipped with different resins according to the different targets contained in the raw water for recovery or removal. The operation principles and steps are as follows: Step 1 starts operation: the first pump starts, the first valve, the second valve, the eleventh valve, and the sixth valve are opened, and the raw water in the raw water pool enters the first column through the first pump, T1, the first valve, and the first upper pipe at a set flow rate, passes through the resin layer in the first column, and then enters the second column through the first lower pipe, the second valve, T2, the eleventh valve, and the second upper pipe; after passing through the resin layer of the second column, it is discharged through the second lower pipe, the sixth valve, and T4 to become the post-delivery water to the post-delivery water treatment system. At this time, the system is a series connection of the first column and the second column. Step 2 Series column switching 1: When the 1st column and the 2nd column in step 1 are operated in series until the M1 value reaches the set value, indicating that the resin in the 1st column is close to saturation in adsorbing the target substance in the raw water, the 1st valve, the 2nd valve, the 11th valve and the 6th valve are closed, and the 4th valve, the 5th valve, the 12th valve and the 9th valve are opened. The raw water enters the 2nd column through the 1st pump, T1, the 4th valve and the 2nd upper pipe, passes through the resin layer in the 2nd column, enters the 3rd column through the 2nd lower pipe, the 5th valve, T2, the 12th valve and the 3rd upper pipe, and then passes through the resin layer of the 3rd column, and is discharged to the after-handling water treatment system through the 3rd lower pipe and the 9th valve; at this time, the system switches to the 2nd column and the 3rd column in series and downstream operation; Step 3: Resin countercurrent circulation saturation in the first column: When the first valve, the second valve, the eleventh valve and the sixth valve are closed in step 2, the second pump is started, the thirteenth valve and the fourteenth valve are opened, and the raw water passes through the fourteenth valve at a set flow rate, enters the first column through the first lower pipe, and then returns to the raw water pool from the first upper pipe, the thirteenth valve and T3 and detects the target content in the water through T3, and performs countercurrent circulation. When the M2 value reaches the set value, it indicates that the resin is fully saturated, the cycle ends, the second pump stops, and the fourteenth valve is closed; Step 4: Recovery of raw water in the first column and cleaning of resin before regeneration: a) When it is necessary to control the content of components in the raw water, in step 3, while closing valve 14, valves 30 and 20 are opened, column washing water enters the first column at a set flow rate through valves 30, 20 and the first lower connection pipe, the raw water in the first column is pushed out by the column washing water and returned to the raw water tank for recovery through the first upper connection pipe, valve 13 and T3. When the column washing water inflow reaches the set amount, the raw water in the first column is completely pushed out by the column washing water, valve 13 is closed, valves 19 and 28 are opened, column washing water continues to countercurrently wash the resin, and column washing wastewater is discharged through the first upper connection pipe, valve 19, valve 28 and T5. Enter the washing column wastewater treatment system. When the washing column water inflow reaches the set amount, stop the washing column water inflow. After the resin in the first column is thoroughly cleaned, start the next regeneration; b) When there is no need to control the content of the components in the raw water, when in step 3, the 14th valve is closed, the 30th valve and the 20th valve are opened, and the washing column water enters the first column through the 30th valve, the 20th valve and the first lower connecting pipe at a set flow rate to clean the resin in the first column. The washing column wastewater returns to the raw water pool through the first upper connecting pipe, the 13th valve and T3. When the washing column water inflow reaches the set amount, stop the washing column water inflow, the 13th valve is closed, and the resin in the first column is thoroughly cleaned before starting the next regeneration; Step 5: Resin regeneration in the first column: a) When the target substance content in the regeneration liquid needs to be controlled, the 19th valve and the 28th valve are opened, and the quantitative regeneration agent enters the first column through the 30th valve, the 20th valve and the first lower pipe at a set flow rate to regenerate the resin in the first column. The wash water in the first column is pushed out by the regeneration liquid through the first upper pipe, the 19th valve, the 28th valve and T5 and goes to the wash water treatment system through T5. When the detection value of T5 reaches the set value, it means that the wash water in the first column has been completely pushed out by the regeneration liquid, the 19th valve is closed, the 21st valve is opened, and the regeneration liquid in the first column goes to the regeneration liquid treatment system from the first upper pipe, the 21st valve and T6; b) When there is no need to control the target substance content in the regeneration liquid, the 21st valve is opened, and the quantitative regeneration agent enters the 1st column through the 30th valve, the 20th valve and the 1st lower pipe at the set flow rate to regenerate the resin in the 1st column. The regeneration liquid in the 1st column goes to the regeneration liquid treatment system through the 1st upper pipe, the 21st valve and T6; When the regeneration agent entering the first column reaches the set amount, stop feeding the regeneration agent, and the column washing water enters the first column again through the 20th valve and the first lower pipe, and the regeneration liquid in the first column is pushed out from the first upper pipe, the 21st valve and T6 into the regeneration liquid treatment system. When the T6 detection value reaches the set value, the regeneration agent has been completely pushed out by the column washing water, the 21st valve is closed, the 19th valve and the 28th valve are opened, and the column washing wastewater is sent to the column washing wastewater treatment system through the first upper pipe, the 19th valve, the 28th valve and T5, and the tree is continued to be cleaned. The resin is washed in the countercurrent mode. When the column washing water inflow reaches the set amount, the 28th and 30th valves are closed, the 29th and 31st valves are opened, and the column washing water enters the first column through the 31st valve, the 19th valve and the upper pipe, and then goes to the column washing wastewater treatment system through the first lower pipe, the 20th valve, the 29th valve and T5 to wash the resin in the downstream mode. When the detection value of T5 reaches the set value, the resin washing in the first column is completed, the column washing water stops inflowing, the 29th and 31st valves are closed, and the resin regeneration and washing are completed. Step 6: Resin transformation in the first column: When the 29th valve and the 31st valve in step 5 are closed, the 28th valve and the 30th valve are opened, and the quantitative transformation agent enters the first column through the 30th valve, the 20th valve and the first lower pipe at a set flow rate to transform the resin in the first column. The transformation liquid passes through the first upper pipe, the 19th valve, the 28th valve and T5 to the column washing wastewater treatment system. After the transformation agent enters the first column to reach the set amount, the transformation agent is stopped, and the column washing water enters the first column through the 30th valve, the 20th valve and the first lower pipe, and then passes through the first upper pipe, the 19th valve, the 28th valve and T5 to the column washing wastewater treatment system. When the column washing water enters When the water reaches the set amount, the 28th valve and the 30th valve are closed, the 29th valve and the 31st valve are opened, and the column washing water enters the first column through the 31st valve, the 19th valve and the upper pipe, and then passes through the first lower pipe, the 20th valve, the 29th valve and T5 and is detected by T5 before going to the column washing wastewater treatment system. When the detection value of T5 reaches the set value, the resin in the first column is washed, the column washing water stops entering, the 19th valve, the 20th valve, the 29th valve and the 31st valve are closed, and the resin transformation and cleaning are completed. This step is omitted for resins that do not need transformation, the same below; after the resin regeneration, transformation and cleaning are completed, the first column waits for the next switch; Step 7 Series column switching 2: When the second column and the third column in step 2 are operated in series until the M1 value reaches the set value, indicating that the resin in the second column is close to saturation in adsorbing the target substance in the raw water, the fourth valve, the fifth valve, the twelfth valve and the ninth valve are closed, and the seventh valve, the eighth valve, the tenth valve and the valve 3 are opened. The raw water enters the third column through the first pump, T1, the seventh valve and the third upper pipe, passes through the resin layer in the third column, enters the first column through the third lower pipe, the eighth valve, T2, the tenth valve and the first upper pipe, and then passes through the resin layer of the first column, and is discharged to the after-hand water treatment system through the first lower pipe and valve 3; at this time, the system switches to the third column and the first column in series and downstream operation; Step 8: Countercurrent circulation saturation of the resin in the second column: When the 4th, 6th, 12th and 9th valves are closed in step 7, the 2nd pump is started, the 15th and 16th valves are opened, and the raw water enters the second column through the 16th valve and the 2nd lower pipe, and then enters the raw water tank from the 2nd upper pipe, the 15th valve and T3 and after the target content in the water is detected by T3, it is circulated in the countercurrent. When the M2 value reaches the set value, the resin in the second column is completely saturated, the cycle ends, the 2nd pump is stopped, and the 16th valve is closed; Step 9: Recovery of raw water in the second column and cleaning of resin before regeneration: a) When it is necessary to control the content of components in the raw water, in step 8, while closing valve 16, valves 30 and 23 are opened, column washing water enters the second column at a set flow rate through valve 30, valve 23 and the second lower connecting pipe, the raw water in the second column is pushed out by the column washing water and returned to the raw water tank for recovery through the second upper connecting pipe, valve 15 and T3. When the column washing water inflow reaches the set amount, the raw water in the second column is completely pushed out by the column washing water, valve 15 is closed, valves 22 and 28 are opened, column washing water continues to countercurrently wash the resin, and column washing wastewater is discharged through the second upper connecting pipe, valve 22, valve 28 and T5. Enter the washing column wastewater treatment system. When the washing column water inflow reaches the set amount, stop the washing column water inflow, and start the next regeneration after the resin in the second column is thoroughly cleaned; b) When it is not necessary to control the content of the components in the raw water, when in step 8, the 16th valve is closed, the 30th valve and the 23rd valve are opened, and the washing column water enters the second column through the 30th valve, the 23rd valve and the second lower connecting pipe at a set flow rate to clean the resin in the second column. The washing column wastewater returns to the raw water pool through the second upper connecting pipe, the 15th valve and T3. When the washing column water inflow reaches the set amount, stop the washing column water inflow, the 15th valve is closed, and the resin in the second column is thoroughly cleaned before starting the next regeneration; Step 10 Regeneration of resin in the second column: a) When it is necessary to control the content of the target substance in the regeneration liquid, the 22nd valve and the 28th valve are opened, and the quantitative regeneration agent enters the second column through the 30th valve, the 23rd valve and the second lower pipe at a set flow rate to regenerate the resin in the second column. The wash water in the second column is pushed out by the regeneration liquid through the second upper pipe, the 22nd valve, the 28th valve and T5 and then goes to the wash water treatment system through T5. When the detection value of T5 reaches the set value, it means that the wash water in the second column is The water has been completely pushed out by the regeneration liquid, the 22nd valve is closed, the 24th valve is opened, and the regeneration liquid in the second column is sent to the regeneration liquid treatment system through the 2nd upper pipe, the 24th valve and T6; b) When there is no need to control the target substance content in the regeneration liquid, the 24th valve is opened, and the quantitative regeneration agent enters the second column at a set flow rate through the 30th valve, the 23rd valve and the 2nd lower pipe to regenerate the resin in the second column, and the regeneration liquid in the second column is sent to the regeneration liquid treatment system through the 2nd upper pipe, the 24th valve and T6; When the regeneration agent entering the second column reaches the set amount, stop feeding the regeneration agent, and the column washing water enters the second column again through the 23rd valve and the second lower pipe, and the regeneration liquid in the second column is pushed out from the second upper pipe, the 24th valve and T6 into the regeneration liquid treatment system. When the T6 detection value reaches the set value, the regeneration agent has been completely pushed out by the column washing water, the 24th valve is closed, the 22nd valve and the 28th valve are opened, and the column washing wastewater is sent to the column washing wastewater treatment system through the second upper pipe, the 22nd valve, the 28th valve and T5, and the tree is continued to be cleaned. The resin is washed in the countercurrent mode. When the washing water inflow reaches the set amount, the 28th and 30th valves are closed, the 29th and 31st valves are opened, and the washing water enters the second column through the 31st valve, the 22nd valve and the upper pipe, and then goes to the washing column wastewater treatment system through the second lower pipe, the 23rd valve, the 29th valve and T5 to wash the resin in the downstream mode. When the detection value of T5 reaches the set value, the washing of the resin in the second column is completed, the washing water stops inflowing, the 29th and 31st valves are closed, and the resin regeneration and washing are completed. Step 11: Resin transformation in the second column: When the 29th valve and the 31st valve in step 10 are closed, the 28th valve and the 30th valve are opened, and the quantitative transformation agent enters the second column through the 30th valve, the 23rd valve and the second lower pipe at a set flow rate to transform the resin in the second column, and the transformation liquid passes through the second upper pipe, the 22nd valve, the 28th valve and T5 to the column washing wastewater treatment system. After the transformation agent enters the second column to reach the set amount, the transformation agent is stopped, and the column washing water enters the second column through the 30th valve, the 23rd valve and the second lower pipe, and then passes through the second upper pipe, the 22nd valve, the 28th valve and T5 to the column washing wastewater. Treatment system, when the column washing water inflow reaches the set amount, the 28th valve and the 30th valve are closed, the 29th valve and the 31st valve are opened, and the column washing water enters the second column through the 31st valve, the 22nd valve and the upper pipe, and then passes through the second lower pipe, the 23rd valve, the 29th valve and T5 and is detected by T5 before going to the column washing wastewater treatment system. When the detection value of T5 reaches the set value, the resin in the second column is washed, the column washing water stops inflowing, the 22nd valve, the 23rd valve, the 29th valve and the 31st valve are closed, and the resin transformation and cleaning are completed; after the resin regeneration, transformation and cleaning are completed, the second column waits for the next switch; Step 12: Switching columns in series 3: When the M1 value of the third column and the first column in step 7 reaches the set value, indicating that the resin in the third column is close to saturation in adsorbing the target substance in the raw water, close the seventh valve, the eighth valve, the tenth valve and the valve 3, and switch to the first column and the second column in series to run downstream according to step 1; Step 13: saturation of the resin in the third column by countercurrent circulation: when the 7th valve, the 8th valve, the 10th valve and the valve 3 are closed in step 12, the 2nd pump is started, the 17th valve and the 18th valve are opened, the raw water passes through the 18th valve, the 3rd lower pipe, the 3rd column, the 3rd upper pipe, the 17th valve and T3, and enters the raw water pool after the target content in the water is detected by T3, and countercurrent circulation is performed. When the M2 value reaches the set value, the resin in the third column is completely saturated, the circulation ends, the 2nd pump is stopped, and the 18th valve is closed; Step 14: Recovery of raw water in the third column and cleaning of resin before regeneration: a) When it is necessary to control the content of components in the raw water, in step 13, while closing valve 18, valves 30 and 26 are opened, column washing water enters the third column at a set flow rate through valves 30, 26 and the third lower connection pipe, the raw water in the third column is pushed out by the column washing water and returned to the raw water tank for recovery through the third upper connection pipe, valve 17 and T3. When the column washing water inflow reaches the set amount, the raw water in the third column is completely pushed out by the column washing water, valve 17 is closed, valves 25 and 28 are opened, column washing water continues to countercurrently wash the resin, and column washing wastewater is discharged through the third upper connection pipe, valve 25, valve 28 and T5. The column washing wastewater is discharged into the column washing wastewater treatment system. When the column washing water inflow reaches the set amount, the column washing water is stopped, and the resin in the third column is thoroughly cleaned before the next regeneration is started; b) when it is not necessary to control the content of the components in the raw water, in step 13, while the 18th valve is closed, the 30th valve and the 26th valve are opened, and the column washing water enters the third column through the 30th valve, the 26th valve and the third lower pipe at a set flow rate to clean the resin in the third column. The column washing wastewater returns to the raw water pool through the third upper pipe, the 17th valve and T3. When the column washing water inflow reaches the set amount, the column washing water is stopped, the 17th valve is closed, and the resin in the third column is thoroughly cleaned before the next regeneration is started; Step 15 Regeneration of resin in the third column: a) When it is necessary to control the content of the target substance in the regeneration liquid, the 25th valve and the 28th valve are opened, and the quantitative regeneration agent enters the third column through the 30th valve, the 26th valve and the third lower pipe at a set flow rate to regenerate the resin in the third column. The column washing water in the third column is pushed out by the regeneration liquid through the third upper pipe, the 25th valve, the 28th valve and T5 and then goes to the column washing water treatment system through T5. When the detection value of T5 reaches the set value, it means that the column washing water in the third column is The water has been completely pushed out by the regeneration liquid, the 25th valve is closed, the 27th valve is opened, and the regeneration liquid in the 3rd column is sent to the regeneration liquid treatment system through the 3rd upper pipe, the 27th valve and T6; b) When there is no need to control the target substance content in the regeneration liquid, the 27th valve is opened, and the quantitative regeneration agent enters the 3rd column at a set flow rate through the 30th valve, the 26th valve and the 3rd lower pipe to regenerate the resin in the 3rd column, and the regeneration liquid in the 3rd column is sent to the regeneration liquid treatment system through the 3rd upper pipe, the 27th valve and T6; When the regeneration agent entering the third column reaches the set amount, stop feeding the regeneration agent, and the column washing water enters the third column again through the 26th valve and the 3rd lower pipe, and the regeneration liquid in the third column is pushed out from the 3rd upper pipe, the 27th valve and T6 into the regeneration liquid treatment system. When the T6 detection value reaches the set value, the regeneration agent has been completely pushed out by the column washing water, the 27th valve is closed, the 25th valve and the 28th valve are opened, and the column washing wastewater is sent to the column washing wastewater treatment system through the 3rd upper pipe, the 25th valve, the 28th valve and T5, and the tree is continued to be cleaned. The resin is washed in the countercurrent mode. When the column washing water inflow reaches the set amount, the 28th and 30th valves are closed, the 29th and 31st valves are opened, and the column washing water enters the 3rd column through the 31st valve, the 25th valve and the upper pipe, and then goes to the column washing wastewater treatment system through the 3rd lower pipe, the 26th valve, the 29th valve and T5 to wash the resin in the downstream mode. When the detection value of T5 reaches the set value, the resin washing in the 3rd column is completed, the column washing water stops inflowing, the 29th and 31st valves are closed, and the resin regeneration and washing are finished. Step 16: Resin transformation in the third column: When the 29th valve and the 31st valve in step 15 are closed, the 28th valve and the 30th valve are opened, the quantitative transformation agent enters the third column through the 30th valve, the 26th valve and the 3rd lower pipe at a set flow rate to transform the resin in the third column, and the transformation liquid passes through the 3rd upper pipe, the 25th valve, the 28th valve and T5 to the column washing wastewater treatment system. After the transformation agent enters the third column to reach the set amount, the transformation agent is stopped, and the column washing water enters the third column through the 30th valve, the 26th valve and the 3rd lower pipe, and then passes through the 3rd upper pipe, the 25th valve, the 28th valve and T5 to the column washing wastewater. Treatment system, when the column washing water inflow reaches the set amount, the 28th valve and the 30th valve are closed, the 29th valve and the 31st valve are opened, and the column washing water enters the 3rd column through the 31st valve, the 25th valve and the upper pipe, and then passes through the 3rd lower pipe, the 26th valve, the 29th valve and T5 and is detected by T5 before going to the column washing wastewater treatment system. When the detection value of T5 reaches the set value, the resin in the 3rd column is washed, the column washing water stops inflowing, the 25th valve, the 26th valve, the 29th valve and the 31st valve are closed, and the resin transformation and cleaning are completed; after the resin regeneration, transformation and cleaning are completed, the 3rd column waits for the next switch; Step 17 repeats step 2 to step 16 to achieve continuous operation of the system; Step 18: After the raw water has been adsorbed by the series column to remove the target substance, the post-delivery water is tested by the online detector T4 and then discharged into the post-delivery treatment system. T4 is set to ensure that the target substance content in the post-delivery water does not exceed the set value. Through online detection of T1 and T2 and control according to the set M1 value, the normal and continuous operation of the system can be guaranteed. However, in abnormal conditions, including but not limited to water quality exceeding the normal range, M1 value set too high or too low, partial resin failure or poor regeneration, or equipment failure, the T4 detection value will exceed the set value. Once the T4 value exceeds the standard, the resin column needs to be switched, the process parameters and operating procedures adjusted, or troubleshooting operations performed.

9. The continuous series operation and circulating saturated ion exchange system according to claim 1 or 2 or 3 or 4 or 6 or 7 or 8, characterized in that: T1, T2, T3, T4, T5 and T6 online detectors are pH online detectors, electronic flow meters, color difference online detectors or sensors, chromaticity online detectors or sensors, color sensors, oxidation electrode potential ORP online detectors, conductivity online detectors, online colorimeters or sensors and metal ion online detectors, one or a combination of several thereof.

10. The continuous series operation and circulating saturated ion exchange system according to claim 1 or 2 or 4 or 5 or 6 or 7, characterized in that: The valve is a manual valve, an automatic valve, an automatic valve with a manual valve bypass, or a combination of the above.

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