A high-recovery rate water reuse deep treatment system and treatment method

Abstract

The present invention discloses a high-recovery rate reclaimed water reuse deep treatment system and treatment method, comprising a wastewater pretreatment system, a primary reverse osmosis system, a concentrated water concentration reduction system and a recycled water treatment system, wherein the primary reverse osmosis system comprises a multi-media filter, a self-cleaning filter, an ultrafiltration device and a primary reverse osmosis device, wherein the multi-media filter, the self-cleaning filter, the ultrafiltration device and the primary reverse osmosis device are interconnected, and the concentrated water concentration reduction system comprises a primary concentration system and a secondary concentration system, wherein the primary concentration system is connected to the secondary concentration system. The present invention effectively combines a conventional membrane treatment system with a softening and hardness removal process, thereby greatly reducing chemical scale in the system, greatly improving the reclaimed water desalination rate through the setting of a primary reverse osmosis system, and greatly improving the overall recovery rate through a concentrated water concentration reduction system and a recycled water treatment system, reducing the discharge of concentrated brine and wastewater, and greatly reducing the operation and maintenance costs of the system.

Description

Technical Field

[0001] The invention belongs to the technical field of reclaimed water recovery and treatment, and in particular relates to a high-recovery-rate reclaimed water reuse deep treatment system and a treatment method. Background Art

[0002] With the development of the national economy, my country's water shortage, serious water pollution, and low reuse rate of sewage and wastewater are becoming increasingly prominent. The continuous expansion of industrial production has rapidly increased industrial water consumption and wastewater production. The direct discharge of wastewater from the original water system without treatment not only pollutes the environment, but also wastes water resources. In response to the national environmental protection policy, water conservation and emission reduction, membrane water treatment technology is currently widely used as the mainstream technology for boiler feed water treatment systems and industrial wastewater zero discharge systems using reclaimed water as the water source.

[0003] Due to high suspended solids, high salt content, high hardness, high chloride ion and other components in the reclaimed water, the system equipment, pipelines, valves, etc. have a high risk of corrosion, and the membrane system operation process also has a very high risk of fouling and scaling. In order to ensure the safe and stable operation of the system, it is usually necessary to reduce the ultrafiltration and reverse osmosis membrane operating flux and reverse osmosis membrane rejection rate to reduce the concentration polarization of the membrane system, thereby reducing the fouling and structural risks of the membrane system.

[0004] However, reducing the operating flux of the membrane system and the desalination rate of the reverse osmosis membrane will directly lead to a decrease in the recovery rate of the reclaimed water treatment system and a large amount of concentrated brine wastewater. At the same time, reducing the desalination rate of the reverse osmosis membrane will easily lead to the problem that the system product water quality does not meet the reuse requirements, and the reverse osmosis product water usually needs to be desalinated twice. Among them, the Chinese invention patent with publication number: CN102633411B discloses an integrated reclaimed water treatment device, which includes an adjusting tank, an aeration grid, an air flotation tank, an anaerobic tank, an aerobic tank, a sedimentation tank, a filter tank, a disinfection tank and a siphon type mud discharge pipe. The aeration grid is located at the water inlet of the adjusting tank, the air flotation tank is located at the upper end of the adjusting tank, one end of the siphon type mud discharge pipe is located in the adjusting tank, and the other end is located at the bottom of the sedimentation tank. The sewage to be treated first passes through the aeration grid, and then is pumped into the air flotation tank by a lifting pump, and then flows through the air flotation tank, anaerobic tank, aerobic tank, sedimentation tank, filter tank and disinfection tank in sequence, where the maximum liquid level difference decreases successively. The integrated reclaimed water treatment device can improve the effluent quality of the reclaimed water treatment device, but it is easy to cause the problem of low recovery rate of the reclaimed water treatment system and large output of concentrated brine wastewater. The Chinese invention patent with publication number: CN110386695A discloses a reclaimed water treatment system, which includes a drainage tank, a self-cleaning filter, an immersed ultrafiltration device, an ultrafiltration water production tank, a manganese sand filter, a manganese sand water production tank, a security filter, and a reverse osmosis device; each device is connected in sequence, and the system can solve the problem of system scaling by setting reasonable dosing points and adding appropriate treatment agents, but it is easy to increase the consumption of raw water, which increases the investment cost, operation cost and wastewater treatment cost of the system to a certain extent.

[0005] Therefore, in view of the above technical problems, it is necessary to provide a high-recovery rate water reuse deep treatment system and treatment method. Summary of the invention

[0006] The purpose of the present invention is to provide a high-recovery rate reclaimed water reuse deep treatment system and treatment method to solve the problems of the above-mentioned membrane water treatment system being easy to crystallize and precipitate to form chemical scale, having a low overall recovery rate, a large output of concentrated brine wastewater, and increased costs due to serious waste of water resources and large consumption of raw water.

[0007] In order to achieve the above purpose, the technical solution provided by an embodiment of the present invention is as follows:

[0008] A high-recovery rate reclaimed water reuse deep treatment system comprises a wastewater pretreatment system, a primary reverse osmosis system, a concentrate water concentration and reduction system and a recycled water treatment system, wherein the primary reverse osmosis system comprises a multi-media filter, a self-cleaning filter, an ultrafiltration device and a primary reverse osmosis device, wherein the multi-media filter, the self-cleaning filter, the ultrafiltration device and the primary reverse osmosis device are interconnected, the concentrate water concentration and reduction system comprises a primary concentration system and a secondary concentration system, wherein the primary concentration system is connected to the secondary concentration system, and the recycled water treatment system is respectively connected to the primary reverse osmosis system and the concentrate water concentration and reduction system.

[0009] Furthermore, the number of the multi-media filters is eight, and the eight multi-media filters are connected by a mother pipe to remove suspended matter in raw water and increase the turbidity of raw water. The number of the self-cleaning filters is two, and the filtration accuracy of each self-cleaning filter is 100μm, which effectively protects the safety of the ultrafiltration device and is used to remove solid suspended matter, soft impurities and fibrous impurities larger than 100μm in water.

[0010] Furthermore, the primary reverse osmosis system includes an automatic heating device, which is a plate heat exchanger to avoid the decline in the production of the ultrafiltration device and the primary reverse osmosis device due to the low water temperature in winter.

[0011] Furthermore, there are five groups of the first-stage reverse osmosis devices, and each group of the first-stage reverse osmosis devices includes a 5μm security filter, a high-pressure pump and a reverse osmosis membrane. The high-pressure pump is connected to the 5μm security filter, and the reverse osmosis membrane is arranged in the 5μm security filter to remove most of the salts, colloids, organic matter and microorganisms in the raw water.

[0012] Furthermore, the primary concentration system includes a concentrate self-cleaning filter, a concentrate ultrafiltration device and a primary concentrate reverse osmosis device. The number of the concentrate self-cleaning filters is three sets, and the filtration accuracy of each set of the concentrate self-cleaning filters is 50μm. The concentrate self-cleaning filter is connected to the concentrate ultrafiltration device to avoid blockage of the primary concentrate reverse osmosis device and the secondary concentrate reverse osmosis device.

[0013] Furthermore, the number of the first-stage concentrated water reverse osmosis devices is three, and each set of the first-stage concentrated water reverse osmosis devices includes a 5μm security filter, a high-pressure pump and a reverse osmosis membrane.

[0014] Furthermore, the secondary concentration system includes two sets of secondary concentrated water reverse osmosis devices, each set of which includes a 5μm security filter, a high-pressure pump, an inter-stage booster pump and a reverse osmosis membrane for further filtering salts in the reclaimed water.

[0015] Furthermore, both the primary reverse osmosis system and the concentrated water reduction system are provided with composite antiscalant dosing points, which greatly reduces the scaling risk of equipment in the primary reverse osmosis system and the concentrated water reduction system.

[0016] Furthermore, the recycled water treatment system includes a recycled water multimedia filter and an activated carbon filter. The number of the recycled water multimedia filter and the activated carbon filter are two. The recycled water multimedia filter and the activated carbon filter are connected through a mother pipe, which can greatly improve the overall recovery rate, reduce the discharge of concentrated brine and wastewater, and greatly reduce the operation and maintenance costs of the system.

[0017] A high-recovery water reuse deep treatment method comprises the following steps:

[0018] S1. Wastewater pretreatment: The raw water discharged from the factory area is passed through the wastewater pretreatment system to filter out impurities, garbage and other waste in the raw water;

[0019] S2. Primary reverse osmosis treatment: The treated raw water is filtered through multiple multi-media filters in the primary reverse osmosis system to remove suspended matter and reduce the turbidity of the raw water. The raw water treated by the multi-media filter is passed through a self-cleaning filter to remove suspended solids, soft impurities and fibrous impurities larger than 100 μm in the water. The raw water is passed through a plate heater to ensure the temperature of the raw water and facilitate the treatment of the raw water by the ultrafiltration device and the primary reverse osmosis device. The suspended matter, colloid, chromaticity, turbidity, organic matter, microorganisms and heavy metals in the raw water are removed by the ultrafiltration device. The ultrafiltration water enters the primary reverse osmosis membrane group and passes through the primary reverse osmosis membrane under the action of a high-pressure pump. The product water enters the primary reverse osmosis water production tank. The dissolved solids are intercepted by the primary reverse osmosis membrane. The product water of the primary reverse osmosis system is collected in the desalted water tank as industrial make-up water for the plant area. The concentrated water of the primary reverse osmosis system is collected in the primary concentrated brine tank.

[0020] S3. Softening treatment: The concentrated water in the primary reverse osmosis system passes through the softening system to soften the reclaimed water to reduce the hardness of the reclaimed water, thereby reducing the scaling risk of the subsequent membrane system;

[0021] S4. Primary concentrated water reverse osmosis treatment: The softened water is passed through a concentrated water self-cleaning filter and a concentrated water ultrafiltration device as a pretreatment of the primary concentrated water reverse osmosis device, and then subjected to primary concentrated water reverse osmosis treatment;

[0022] S5. Secondary concentrated water reverse osmosis treatment: The concentrated water treated above is collected into the secondary concentrated water tank as the inlet water of the secondary concentrated water reverse osmosis device; the product water treated by the primary and secondary concentrated water reverse osmosis treatment is collected into the demineralized water tank and mixed with the product water treated by the primary reverse osmosis treatment as the make-up water for the plant production; the concentrated water treated by the secondary concentrated water reverse osmosis treatment is recycled into the concentrated salt wastewater pool and mixed with the wastewater in the wastewater pretreatment system and then delivered to the concentrated salt water users;

[0023] S6. Recycled water treatment: The backwash effluents from the primary reverse osmosis system and the ultrafiltration device in the concentrated water reduction system are mixed and recycled to the recovery water pool, and then processed by the multi-media filter and activated carbon filter in turn and collected in the clean water tank, and S2-S5 are repeated.

[0024] Compared with the prior art, the present invention has the following advantages:

[0025] The present invention effectively combines a conventional membrane treatment system with a softening and hardness removal process, thereby significantly reducing chemical scale in the system, and significantly improving the desalination rate of reclaimed water by setting up a primary reverse osmosis system. The concentrated water concentration and reduction system and the recovered water treatment system can significantly improve the overall recovery rate, reduce the discharge of concentrated brine and wastewater, and significantly reduce the operation and maintenance costs of the system. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments recorded in the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0027] Figure 1 The present invention is a process flow chart of a high-recovery rate reclaimed water reuse deep treatment system in one embodiment of the present invention. DETAILED DESCRIPTION

[0028] The present invention will be described in detail below in conjunction with the various embodiments shown in the accompanying drawings. However, these embodiments do not limit the present invention, and any structural, methodological, or functional changes made by a person skilled in the art based on these embodiments are all within the scope of protection of the present invention.

[0029] The present invention discloses a high recovery rate water reuse deep treatment system. Figure 1 As shown, it includes a wastewater pretreatment system, a primary reverse osmosis system, a concentrated water concentration and reduction system, and a recycled water treatment system.

[0030] Ginseng Figure 1As shown, the primary reverse osmosis system includes a multi-media filter, a self-cleaning filter, an ultrafiltration device and a primary reverse osmosis device. There are eight multi-media filters, which are connected by a mother pipe. The multi-media filters are used to remove more than 99% of suspended matter, colloids and small particle impurities in the reclaimed water. During normal operation, seven filters are in operation and one is backwashing. There are two self-cleaning filters, and the filtration accuracy of each self-cleaning filter is 100μm. The self-cleaning filter adopts automatic control. When the inlet and outlet water pressure difference or time reaches the set value, automatic cleaning begins.

[0031] Among them, the filter media of the multi-media filter is anthracite and graded quartz sand. At the same time, the multi-media filter is equipped with two backwash water pumps and is connected to a compressed air pipe for enhanced backwashing.

[0032] Ginseng Figure 1 As shown, the primary reverse osmosis system includes an automatic heating device, which is a plate heat exchanger. The plate heat exchanger can maintain the water temperature at 25°C to avoid the decline of the ultrafiltration device and the primary reverse osmosis device due to the low water temperature in winter. The number of primary reverse osmosis devices is five groups, and each group of primary reverse osmosis devices includes a 5μm security filter, a high-pressure pump and a reverse osmosis membrane. The high-pressure pump is connected to the 5μm security filter. The reverse osmosis membrane is arranged in the 5μm security filter to remove most of the salts, colloids, organic matter and microorganisms in the raw water. The desalination rate treated by the primary reverse osmosis system is 97%, and the recovery rate is 75%.

[0033] Ginseng Figure 1 As shown, the primary concentration system includes a concentrate self-cleaning filter, a concentrate ultrafiltration device and a primary concentrate reverse osmosis device. The number of concentrate self-cleaning filters is three sets, and the filtration accuracy of each set of concentrate self-cleaning filters is 50μm. The concentrate self-cleaning filter is connected to the concentrate ultrafiltration device to avoid clogging of the primary concentrate reverse osmosis device and the secondary concentrate reverse osmosis device. The recovery rate of the concentrate ultrafiltration device is 90%. It adopts a full-flow filtration mode for operation, and its backwash water is recovered to the recovery pool. The number of primary concentrate reverse osmosis devices is three sets, and each set of primary concentrate reverse osmosis devices includes a 5μm security filter, a high-pressure pump and a reverse osmosis membrane. The desalination rate of the primary concentrate reverse osmosis system is 90%, and the recovery rate is 65%. The desalination rate of the secondary concentrate reverse osmosis system is 90%, and the recovery rate is 60%. Flushing pumps are respectively arranged in the primary reverse osmosis system and the concentrate concentration and reduction system to prevent structural phenomena at each level of reverse osmosis.

[0034] Specifically, both the primary reverse osmosis system and the brine concentration and reduction system are equipped with composite antiscalant dosing points, which greatly reduce the scaling risk of equipment in the primary reverse osmosis system and the brine concentration and reduction system. The composite antiscalant is a special antiscalant for the brine reverse osmosis device, which has a strong dispersing effect on substances such as calcium carbonate, magnesium carbonate, calcium sulfate, and calcium fluoride. Its performance is better than that of ordinary reverse osmosis system antiscalants, and it is suitable for high-salinity, high-hardness reclaimed water and seawater.

[0035] Ginseng Figure 1 As shown, the recycled water treatment system includes a recycled water multi-media filter and an activated carbon filter. The number of the recycled water multi-media filter and the activated carbon filter are two. The recycled water multi-media filter and the activated carbon filter are connected through a mother pipe, which can greatly improve the overall recovery rate, reduce the discharge of brine and wastewater, and greatly reduce the operation and maintenance costs of the system. The final brine yield of the system is reduced to 7%, the final wastewater yield is reduced to 3%, and the overall recovery rate is increased to 90%.

[0036] Specifically, the main equipment, pipelines and other flow-through components in each system are made of materials that are resistant to corrosion by high-concentration salt and high-concentration chloride ions.

[0037] A high-recovery water reuse deep treatment method comprises the following steps:

[0038] S1 Wastewater pretreatment: The raw water discharged from the factory area is passed through the wastewater pretreatment system to filter out impurities, garbage and other waste in the raw water;

[0039] S2. Primary reverse osmosis treatment: The treated raw water is filtered through multiple multi-media filters in the primary reverse osmosis system to remove suspended matter and reduce the turbidity of the raw water. The raw water treated by the multi-media filter is passed through a self-cleaning filter to remove suspended solids, soft impurities and fibrous impurities larger than 100 μm in the water. The raw water is passed through a plate heater to ensure the temperature of the raw water and facilitate the treatment of the raw water by the ultrafiltration device and the primary reverse osmosis device. The suspended matter, colloid, chromaticity, turbidity, organic matter, microorganisms and heavy metals in the raw water are removed by the ultrafiltration device. The ultrafiltration water enters the primary reverse osmosis membrane group and passes through the primary reverse osmosis membrane under the action of a high-pressure pump. The product water enters the primary reverse osmosis water production tank. The dissolved solids are intercepted by the primary reverse osmosis membrane. The product water of the primary reverse osmosis system is collected in the desalted water tank as industrial make-up water for the plant area. The concentrated water of the primary reverse osmosis system is collected in the primary concentrated brine tank.

[0040] S3. Softening treatment: The concentrated water in the primary reverse osmosis system passes through the softening system to soften the reclaimed water to reduce the hardness of the reclaimed water, thereby reducing the scaling risk of the subsequent membrane system;

[0041] S4. Primary concentrated water reverse osmosis treatment: The softened water is passed through a concentrated water self-cleaning filter and a concentrated water ultrafiltration device as a pretreatment of the primary concentrated water reverse osmosis device, and then subjected to primary concentrated water reverse osmosis treatment;

[0042] S5. Secondary concentrated water reverse osmosis treatment: The concentrated water treated above is collected into the secondary concentrated water tank as the inlet water of the secondary concentrated water reverse osmosis device; the product water treated by the primary and secondary concentrated water reverse osmosis treatment is collected into the demineralized water tank and mixed with the product water treated by the primary reverse osmosis treatment as the make-up water for the plant production; the concentrated water treated by the secondary concentrated water reverse osmosis treatment is recycled into the concentrated salt wastewater pool and mixed with the wastewater in the wastewater pretreatment system and then delivered to the concentrated salt water users;

[0043] S6. Recycled water treatment: The backwash effluents from the primary reverse osmosis system and the ultrafiltration device in the concentrated water reduction system are mixed and recycled to the recovery water pool, and then processed by the multi-media filter and activated carbon filter in turn and collected in the clean water tank, and S2-S5 are repeated.

[0044] It can be seen from the above technical solutions that the present invention has the following beneficial effects:

[0045] The present invention effectively combines a conventional membrane treatment system with a softening and hardness removal process, thereby significantly reducing chemical scale in the system, and significantly improving the desalination rate of reclaimed water by setting up a primary reverse osmosis system. The concentrated water concentration and reduction system and the recovered water treatment system can significantly improve the overall recovery rate, reduce the discharge of concentrated brine and wastewater, and significantly reduce the operation and maintenance costs of the system.

[0046] It will be apparent to those skilled in the art that the invention is not limited to the details of the exemplary embodiments described above and that the invention can be implemented in other specific forms without departing from the spirit or essential features of the invention. Therefore, the embodiments should be considered exemplary and non-limiting in all respects, and the scope of the invention is defined by the appended claims rather than the foregoing description, and it is intended that all variations falling within the meaning and scope of the equivalent elements of the claims be included in the invention. Any reference numeral in a claim should not be considered as limiting the claim to which it relates.

[0047] In addition, it should be understood that although the present specification is described according to embodiments, not every embodiment contains only one independent technical solution. This narrative method of the specification is only for the sake of clarity. Those skilled in the art should regard the specification as a whole. The technical solutions in each embodiment may also be appropriately combined to form other implementation methods that those skilled in the art can understand.

Claims

1. A high recovery rate water reuse deep treatment system, characterized in that: It includes a wastewater pretreatment system, a primary reverse osmosis system, a concentrated water concentration and reduction system, and a recycled water treatment system. The primary reverse osmosis system includes a multi-media filter, a self-cleaning filter, an ultrafiltration device, and a primary reverse osmosis device. The multi-media filter, the self-cleaning filter, the ultrafiltration device, and the primary reverse osmosis device are interconnected. The concentrated water concentration and reduction system includes a primary concentration system and a secondary concentration system. The primary concentration system is connected to the secondary concentration system. The recycled water treatment system is respectively connected to the primary reverse osmosis system and the concentrated water concentration and reduction system. The number of the multi-media filters is eight, eight Each of the multi-media filters is connected by a mother pipe. The multi-media filter is used to remove more than 99% of suspended matter, colloids and small particle impurities in the reclaimed water. During normal operation, seven are in operation and one is backwashed. The filter media of the multi-media filter is anthracite and graded quartz sand. At the same time, the multi-media filter is equipped with two backwash water pumps and is connected to a compressed air piping for enhanced backwashing. There are two self-cleaning filters, and the filtration accuracy of each self-cleaning filter is 100μm. The self-cleaning filter adopts automatic control. When the inlet and outlet water pressure difference or time reaches the set value, it starts to clean automatically. There are five groups of the first-level reverse osmosis devices, and each group of the The first-level reverse osmosis device includes a 5μm security filter, a high-pressure pump and a reverse osmosis membrane. The high-pressure pump is connected to the 5μm security filter. The reverse osmosis membrane is arranged in the 5μm security filter to remove most of the salts, colloids, organic matter and microorganisms in the raw water. The desalination rate after treatment by the first-level reverse osmosis system is 97%, and the recovery rate is 75%; the first-level concentration system includes a concentrated water self-cleaning filter, a concentrated water ultrafiltration device and a first-level concentrated water reverse osmosis device. The number of concentrated water self-cleaning filters is three sets, and the filtration accuracy of each set of concentrated water self-cleaning filters is 50μm. The concentrated water self-cleaning filter and the concentrated water ultrafiltration device are respectively 20 μm and 20 μm. The filtration device is connected to avoid clogging of the primary concentrated water reverse osmosis device and the secondary concentrated water reverse osmosis device. The recovery rate of the concentrated water ultrafiltration device is 90%. It adopts full-flow filtration mode for operation, and its backwash water is recovered to the recovery pool; the number of the primary concentrated water reverse osmosis devices is three sets, and each set of the primary concentrated water reverse osmosis devices includes a 5μm security filter, a high-pressure pump and a reverse osmosis membrane. The desalination rate of the primary concentrated water reverse osmosis system is 90%, and the recovery rate is 65%. The desalination rate of the secondary concentrated water reverse osmosis system is 90%, and the recovery rate is 60%. Flushing pumps are respectively arranged in the primary reverse osmosis system and the concentrated water concentration and reduction system to prevent scaling at each level of reverse osmosis.

2. A high recovery rate water reuse deep treatment system according to claim 1, characterized in that: The primary reverse osmosis system includes an automatic heating device, which is a plate heat exchanger. The plate heat exchanger can maintain the water temperature at 25°C to avoid the decline in the production of the ultrafiltration device and the primary reverse osmosis device due to the low water temperature in winter.

3. A high recovery rate water reuse deep treatment system according to claim 1, characterized in that: The secondary concentration system includes a secondary concentrated water reverse osmosis device, the number of the secondary concentrated water reverse osmosis device is two sets, and each set of the secondary concentrated water reverse osmosis device includes a 5μm security filter, a high-pressure pump, an inter-stage booster pump and a reverse osmosis membrane.

4. A high recovery rate water reuse deep treatment system according to claim 1, characterized in that: The primary reverse osmosis system and the brine concentration and reduction system are both provided with composite antiscalant dosing points, which greatly reduce the scaling risk of equipment in the primary reverse osmosis system and the brine concentration and reduction system. The composite antiscalant is a special antiscalant for brine reverse osmosis equipment, which has a strong dispersing effect on calcium carbonate, magnesium carbonate, calcium sulfate and calcium fluoride, and has better performance than ordinary reverse osmosis system antiscalants, and is suitable for high-salinity, high-hardness reclaimed water and seawater.

5. The high recovery rate water reuse deep treatment system according to claim 1 is characterized in that: The recycled water treatment system includes a recycled water multi-media filter and an activated carbon filter. The number of the recycled water multi-media filter and the activated carbon filter are both two. The recycled water multi-media filter is connected to the activated carbon filter through a mother pipe, which can greatly improve the overall recovery rate, reduce the discharge of concentrated brine and wastewater, and greatly reduce the operation and maintenance costs of the system. The final concentrated brine yield of the system is reduced to 7%, the final wastewater yield is reduced to 3%, and the overall recovery rate is increased to 90%; the main equipment and pipelines in each system are made of materials that are resistant to corrosion by high-concentration salt and high-concentration chloride ions.

6. A high-recovery water reuse deep treatment method, characterized in that: The high recovery rate water reuse deep treatment system as claimed in any one of claims 1 to 5 comprises the following steps: S1. Wastewater pretreatment: The raw water discharged from the factory area is passed through the wastewater pretreatment system to filter out impurities and garbage in the raw water; S2. Primary reverse osmosis treatment: The treated raw water is filtered through multiple multi-media filters in the primary reverse osmosis system to remove suspended matter and reduce the turbidity of the raw water. The raw water treated by the multi-media filter is passed through a self-cleaning filter to remove suspended solids, soft impurities and fibrous impurities larger than 100 μm in the water. The raw water is passed through a plate heater to ensure the temperature of the raw water and facilitate the treatment of the raw water by the ultrafiltration device and the primary reverse osmosis device. The suspended matter, colloid, chromaticity, turbidity, organic matter, microorganisms and heavy metals in the raw water are removed by the ultrafiltration device. The ultrafiltration water enters the primary reverse osmosis membrane group and passes through the primary reverse osmosis membrane under the action of a high-pressure pump. The product water enters the primary reverse osmosis water tank. The dissolved solids are intercepted by the primary reverse osmosis membrane. The product water of the primary reverse osmosis system is collected in the desalted water tank as industrial make-up water for the plant area. The concentrated water of the primary reverse osmosis system is collected in the primary concentrated brine tank. S3. Softening treatment: The concentrated water in the primary reverse osmosis system passes through the softening system to soften the reclaimed water to reduce the hardness of the reclaimed water, thereby reducing the scaling risk of the subsequent membrane system; S4. Primary concentrated water reverse osmosis treatment: The softened water is passed through a concentrated water self-cleaning filter and a concentrated water ultrafiltration device as a pretreatment for the primary concentrated water reverse osmosis device, and then subjected to primary concentrated water reverse osmosis treatment; S5. Secondary brine reverse osmosis treatment: The brine treated above is collected into the secondary brine tank as the feed water for the secondary brine reverse osmosis device. The product water from the primary and secondary brine reverse osmosis treatment is collected into the demineralized water tank and mixed with the product water from the primary reverse osmosis treatment as the make-up water for the plant production. The brine from the secondary brine reverse osmosis treatment is recycled into the brine wastewater pool and mixed with the wastewater in the wastewater pretreatment system before being sent to the brine users. S6. Recycled water treatment: The backwash drainage of the primary reverse osmosis system and the ultrafiltration device in the concentrated water reduction system are mixed and recycled to the recovery water pool, and then processed by the multi-media filter and activated carbon filter in turn and collected in the clean water tank, and S2-S5 are repeated.

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