A method of sewage treatment and a treatment system

Abstract

The application discloses a sewage treatment method and a treatment system, wherein the sewage treatment method comprises the following steps: guiding the used acid liquid in an acid washing tank to an acid liquid supply channel, using a heat treatment device to perform temperature adjustment treatment on the acid liquid on the acid liquid supply channel and / or a water supply channel, guiding the temperature-adjusted acid liquid into a resin exchange column, guiding water into the resin exchange column through the water supply channel, and performing evaporation concentration treatment on the acid liquid treated by the resin exchange column, so that the resin exchange column can perform efficient adsorption, and the recycling rate of finished acid is improved.

Description

Technical Field

[0001] This invention relates to the field of wastewater treatment technology for electrolytic acid treatment, and particularly to a wastewater treatment method and system. Background Technology

[0002] Ion exchange resins possess exchange capacity and a range of other excellent properties. For practical application, dynamic continuous exchange methods and corresponding apparatus are recommended for exchanging, separating, concentrating, and adsorbing electrolyte solutions. Research, design, and use have shown that columns or towers packed with ion exchange resins are the most effective. Such columns or towers are called resin beds, and are also commonly referred to as exchange columns or exchange towers.

[0003] Stainless steel is generally pickled using a mixed acid process of HNO3 and HF, which can achieve the best pickling surface quality and effectively avoid the formation of ferric fluoride precipitates, significantly reducing sludge volume. The acid solution after pickling is washed with water through resin adsorption, forming product acid, which can then be recycled. However, some resin beds require a suitable temperature for efficient adsorption, which needs to be optimized. Summary of the Invention

[0004] The main objective of this invention is to propose a wastewater treatment method and system that optimizes existing resin bed adsorption methods for efficient adsorption.

[0005] To achieve the above objectives, the present invention proposes a wastewater treatment method based on a wastewater treatment system, the wastewater treatment system including an acid washing tank, a resin exchange column, and a heat processor, wherein an acid supply flow path and a water supply flow path are formed on the wastewater treatment system, and the wastewater treatment method includes the following steps:

[0006] The used acid solution in the pickling tank is discharged to the acid supply path;

[0007] A heat treatment device is used to regulate the temperature of the acid in the acid supply path and / or the water supply path;

[0008] The temperature-controlled acid solution is introduced into the resin exchange column, and water is introduced into the resin exchange column through the water supply path.

[0009] The acid solution after being treated by the resin exchange column is then evaporated and concentrated.

[0010] Optionally, the resin exchange column has an acid inlet, an acid outlet, a backwash water inlet, and a metal outlet. The wastewater treatment system also includes an acid treatment flow path and a metal treatment flow path. The water supply flow path connects to the backwash water inlet, the acid supply flow path connects to the acid inlet, the acid treatment flow path connects to the acid outlet, and the metal treatment flow path connects to the metal outlet. The heat processor includes a heat exchanger with two mutually exchanging heat flow channels: a first heat exchange channel section and a second heat exchange channel section. The first heat exchange channel section is located on the water supply flow path, and the second heat exchange channel section is located on the acid supply flow path. Along the route, a first temperature sensor is provided on the acid supply flow path and is located near the acid inlet; a second temperature sensor is provided on the water supply flow path and is located near the backwash water inlet; the water supply flow path also includes a first water supply short-circuit branch; the acid supply flow path also includes a first liquid supply short-circuit branch; the wastewater treatment system also includes a first three-way valve and a second three-way valve; the three connecting ports of the first three-way valve are respectively connected to the first heat exchange flow path section, the first water supply short-circuit branch and the backwash water inlet; the three connecting ports of the second three-way valve are respectively connected to the second heat exchange flow path section, the first liquid supply short-circuit branch and the acid inlet.

[0011] The method of using a heat processor to regulate the temperature of the acid in the acid supply path and / or the water supply path includes:

[0012] The first actual temperature value collected by the first temperature sensor;

[0013] The second actual temperature value acquired by the second temperature sensor;

[0014] The larger of the first actual temperature value and the second actual temperature value is selected as the actual temperature value of the object.

[0015] When the actual temperature of the object is less than the first preset temperature value, the control device controls the first three-way valve to switch the first water supply short-circuit branch to connect to the backwash water inlet, and controls the second three-way valve to switch the first liquid supply short-circuit branch to connect to the acid inlet.

[0016] When the actual temperature of the object is greater than the second preset temperature value, the control device controls at least the first three-way valve and the second three-way valve to operate, so as to cool down the acid flowing through the acid inlet, wherein the second preset temperature value is greater than the first preset temperature value.

[0017] Optionally, the wastewater treatment system further includes a transition tank, and the acid supply flow path further includes a tank inlet main line and a tank outlet main line that are both connected to the transition tank. The tank outlet main line is connected to the acid inlet, and the tank inlet main line is connected to the second three-way valve. The first temperature sensor is located on the tank outlet main line.

[0018] The heat processor also includes a refrigerant cooling system, on which a refrigerant circulation path is formed. A compressor, a throttling device, and an evaporator core tube are provided on the refrigerant circulation path, and the evaporator core tube is arranged around the transition groove.

[0019] When the actual temperature of the object is greater than the second preset temperature value, the control device controls at least the first three-way valve and the second three-way valve to operate, in order to cool the acid flowing through the acid inlet, including:

[0020] When the actual temperature of the object is greater than the second preset temperature value and less than or equal to the third preset temperature, the control device controls the first three-way valve to switch the first heat exchange channel section to connect to the backwash water inlet, and controls the second three-way valve to switch the second heat exchange channel section to connect to the acid inlet.

[0021] When the actual temperature of the object is greater than the third preset temperature and less than or equal to the fourth preset temperature, the control device controls the first three-way valve to switch the first water supply short-circuit branch to connect to the backwash water inlet, controls the second three-way valve to switch the first liquid supply short-circuit branch to connect to the acid inlet, controls the compressor to start, and the throttling device to work.

[0022] When the actual temperature of the object is greater than the fourth preset temperature, the control device controls the first three-way valve to switch the first heat exchange channel section to connect to the backwash water inlet, and controls the second three-way valve to switch the second heat exchange channel section to connect to the acid inlet, and controls the compressor to start, and the throttling device to work, wherein the second preset temperature value is less than the third preset temperature, and the third preset temperature value is less than the fourth preset temperature.

[0023] Optionally, when the actual temperature of the object is greater than a fourth preset temperature, the control device controls the first three-way valve to switch the first heat exchange channel section to connect to the backwash water inlet, and controls the second three-way valve to switch the second heat exchange channel section to connect to the acid inlet, and controls the compressor to start, and the throttling device to operate, including:

[0024] Calculate the ratio K between the actual temperature of the object and the fourth preset temperature;

[0025] When 1.5 < K ≤ 2, the throttling device is controlled to be at the first opening degree by the control device;

[0026] When 1 < K ≤ 1.5, the throttling device is controlled to be at the second opening degree by the control device;

[0027] When 2 < K, the throttling device is controlled by the control device to be at a third opening degree, wherein the first opening degree is less than the second opening degree and the first opening degree is greater than the third opening degree.

[0028] Optionally, the acid supply flow path further includes an acid supply main path and two filter flow paths. The acid supply main path is switched to one of the two filter flow paths via a third three-way valve. Each filter flow path is equipped with a filter and a first pressure sensor. A second pressure sensor is also provided on the acid supply main path.

[0029] Multiple first actual pressure values ​​are collected by multiple first pressure sensors, and second actual pressure values ​​are collected by the second pressure sensor;

[0030] The filter flow segment with a non-zero pressure value is selected as the first filter flow segment, and the other is selected as the second filter flow segment. The pressure value of the first filter flow segment is selected as the actual pressure value of the object.

[0031] Calculate the pressure difference between the actual pressure value of the object and the second actual pressure value;

[0032] When the pressure difference meets the preset conditions, the control device controls the third three-way valve to switch the acid supply trunk line to the second filtration flow section.

[0033] The present invention also proposes a wastewater treatment system, which includes an acid pickling tank, a resin exchange column, and a heat processor. An acid supply flow path and a water supply flow path are formed in the wastewater treatment system. The resin exchange column has an acid inlet, an acid outlet, a backwash water inlet, and a molten metal outlet. An acid treatment flow path and a molten metal treatment flow path are also formed in the wastewater treatment system. The water supply flow path is connected to the backwash water inlet, the acid supply flow path is connected to the acid inlet, the acid treatment flow path is connected to the acid outlet, and the molten metal treatment flow path is connected to the molten metal outlet.

[0034] The heat processor includes a heat exchanger, within which two mutually exchanging heat flow channels, a first heat exchange flow channel and a second heat exchange flow channel, are formed. The first heat exchange flow channel is located on the water supply flow path, and the second heat exchange flow channel is located on the acid supply flow path. A first temperature sensor is provided on the acid supply flow path, adjacent to the acid inlet, and a second temperature sensor is provided on the water supply flow path, adjacent to the backwash water inlet. The water supply flow path also includes a first water supply short-circuit branch, and the acid supply flow path also includes a first liquid supply short-circuit branch. The wastewater treatment system also includes a first three-way valve and a second three-way valve. The three ports of the first three-way valve are respectively connected to the first heat exchange flow channel, the first water supply short-circuit branch, and the backwash water inlet. The three ports of the second three-way valve are respectively connected to the second heat exchange flow channel, the first liquid supply short-circuit branch, and the acid inlet.

[0035] Optionally, the wastewater treatment system further includes a transition tank, and the acid supply flow path further includes a tank inlet main line and a tank outlet main line that are both connected to the transition tank. The tank outlet main line is connected to the acid inlet, and the tank inlet main line is connected to the second three-way valve. The first temperature sensor is located on the tank outlet main line, and a third temperature sensor is also provided on the tank inlet main line.

[0036] The heat processor also includes a refrigerant cooling system, on which a refrigerant circulation path is formed. A compressor, a throttling device, and an evaporator core tube are provided on the refrigerant circulation path, and the evaporator core tube is arranged around the transition groove.

[0037] Optionally, a return acid flow path is also formed in the wastewater treatment system. One end of the return acid flow path is connected to the transition tank, and the other end is connected to the acid supply flow path. It is located on the side of the second heat exchange channel section opposite to the second three-way valve.

[0038] Optionally, the acid supply path further includes an acid supply main path and two filter flow sections. The acid supply main path is switched to one of the two filter flow sections via a third three-way valve. Each filter flow section is equipped with a filter and a first pressure sensor. A second pressure sensor is also provided on the acid supply main path.

[0039] Optionally, a first pressure pump is provided in the acid supply flow path; and / or,

[0040] A second pressure pump is provided in the acid treatment flow path.

[0041] In the technical solution provided by this invention, the used acid solution in the pickling tank is exported to the acid supply flow path. A heat processor is used to adjust the temperature of the acid solution in the acid supply flow path and / or the water supply flow path. The temperature-adjusted acid solution is introduced into the resin exchange column, and water is introduced into the resin exchange column through the water supply flow path. The acid solution treated by the resin exchange column is then evaporated and concentrated. In this way, the resin exchange column can perform efficient adsorption, improving the recovery rate of the finished acid. Attached Figure Description

[0042] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on the structures shown in these drawings without creative effort.

[0043] Figure 1 This is a schematic flowchart of an embodiment of the wastewater treatment method provided by the present invention;

[0044] Figure 2 This is a schematic diagram of an embodiment of the wastewater treatment system provided by the present invention.

[0045] Explanation of icon numbers:

[0046]

[0047]

[0048] The realization of the objective, functional features and advantages of the present invention will be further explained in conjunction with the embodiments and with reference to the accompanying drawings. Detailed Implementation

[0049] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of the present invention.

[0050] It should be noted that if the embodiments of the present invention involve directional indicators (such as up, down, left, right, front, back, etc.), the directional indicators are only used to explain the relative positional relationship and movement of the components in a certain specific posture (as shown in the figure). If the specific posture changes, the directional indicators will also change accordingly.

[0051] Furthermore, if the embodiments of this invention involve descriptions such as "first" or "second," these descriptions are for descriptive purposes only and should not be construed as indicating or implying their relative importance or implicitly specifying the number of technical features indicated. Therefore, a feature defined with "first" or "second" may explicitly or implicitly include at least one of those features. Additionally, the technical solutions of the various embodiments can be combined with each other, but this must be based on the ability of those skilled in the art to implement them. If the combination of technical solutions is contradictory or impossible to implement, it should be considered that such a combination of technical solutions does not exist and is not within the scope of protection claimed by this invention.

[0052] Ion exchange resins possess exchange capacity and a range of other excellent properties. For practical application, a dynamic continuous exchange method and corresponding equipment are recommended for exchanging, separating, concentrating, and adsorbing electrolyte solutions. Research, design, and application have shown that columns or towers packed with ion exchange resins are the most effective. Such columns or towers are called resin beds, and are also commonly referred to as exchange columns or exchange towers.

[0053] Stainless steel is generally pickled using a mixed acid process of HNO3 and HF, which can achieve the best pickling surface quality and effectively avoid the formation of ferric fluoride precipitates, significantly reducing sludge volume. The acid solution after pickling is washed with water through resin adsorption, forming product acid, which can then be recycled. However, some resin beds require a suitable temperature for efficient adsorption, which needs to be optimized.

[0054] In view of this, the present invention proposes a wastewater treatment method, wherein, Figure 1 This is a schematic flowchart of an embodiment of the wastewater treatment method provided by the present invention. The wastewater treatment method is based on a wastewater treatment system. Figure 2 This is a schematic diagram of an embodiment of the wastewater treatment system provided by the present invention.

[0055] It should be noted that in this application, all pipes, valves, etc. that form the flow path are specially treated to be acid-resistant, so that while meeting the requirements for the flow of acid, they can also guide the acid.

[0056] Please see Figures 1 to 2 The wastewater treatment system 100 includes an acid pickling tank 1, a resin exchange column 3, and a heat treatment unit 4. An acid supply flow path 31a and a water supply flow path 33a are formed on the wastewater treatment system 100. The wastewater treatment method includes the following steps:

[0057] S10. The used acid solution in the pickling tank 1 is discharged to the acid supply flow path 31a.

[0058] It should be noted that pickling tank 1 is a container used to hold aqueous solution and remove the thin film from the metal surface during the pickling process. It has good alkali resistance, acid resistance, high temperature resistance and corrosion resistance.

[0059] The automotive components are pickled in the pickling tank 1. After pickling, the used acid is discharged to the acid supply flow path 31a for subsequent processing.

[0060] S20. The acid in the acid supply path 31a and / or the water supply path 33a is temperature-controlled using a heat processor 4.

[0061] It should be noted that the adsorption of the resin in the resin exchange column 3 often requires a suitable temperature range to achieve good adsorption capacity. For example, some require around 50℃ to 60℃, some around 40℃, and some around 80℃ to 90℃. Therefore, it is necessary to adjust the temperature of the acid in the acid supply flow path 31a and / or the water supply flow path 33a. Depending on the requirements, either cooling or heating may be performed until the appropriate temperature requirement is met.

[0062] S30. The temperature-controlled acid solution is introduced into the resin exchange column 3, and water is introduced into the resin exchange column 3 through the water supply path 33a.

[0063] The acid solution after temperature conditioning is introduced into the resin exchange column 3, and water is introduced into the resin exchange column 3 through the water supply path 33a, which enables efficient adsorption.

[0064] S40. The acid solution after being treated by the resin exchange column 3 is evaporated and concentrated.

[0065] The acid solution after being treated by the resin exchange column 3 is evaporated and concentrated to obtain the finished acid, which is then recycled and reused.

[0066] In the technical solution provided by this invention, the used acid solution in the pickling tank 1 is exported to the acid supply flow path 31a. The acid solution on the acid supply flow path 31a and / or the water supply flow path 33a is temperature-controlled by a heat processor 4. The temperature-controlled acid solution is then introduced into the resin exchange column 3, and water is introduced into the resin exchange column 3 through the water supply flow path 33a. The acid solution treated by the resin exchange column 3 is then evaporated and concentrated. In this way, the resin exchange column 3 can perform efficient adsorption, thereby improving the recovery rate of the finished acid.

[0067] To facilitate the explanation of the wastewater treatment method of the present invention, the relevant structure of the wastewater treatment system 100 of the present invention is now described in detail. Please refer to the following for details. Figure 2 , Figure 2An embodiment of the wastewater treatment system 100 of the present invention is described in detail below:

[0068] The wastewater treatment system 100 includes an acid pickling tank 1, a resin exchange column 3, and a heat processor 4. An acid supply flow path 31a and a water supply flow path 33a are formed on the wastewater treatment system 100. The resin exchange column 3 has an acid inlet 31, an acid outlet 32, a backwash water inlet 33, and a metal liquid outlet 34. An acid treatment flow path 32a and a metal liquid treatment flow path 34a are also formed on the wastewater treatment system 100. The water supply flow path 33a is connected to the backwash water inlet 33, the acid supply flow path 31a is connected to the acid inlet 31, the acid treatment flow path 32a is connected to the acid outlet 32, and the metal liquid treatment flow path 34a is connected to the metal liquid outlet 34.

[0069] The heat processor 4 includes a heat exchanger 41, within which two heat exchange channels, a first heat exchange channel section 411 and a second heat exchange channel section 412, are formed for mutual heat exchange. The first heat exchange channel section 411 is located on the water supply channel 33a, and the second heat exchange channel section 412 is located on the acid supply channel 31a. A first temperature sensor 51 is provided on the acid supply channel 31a, adjacent to the acid inlet 31, and a second temperature sensor 52 is provided on the water supply channel 33a, adjacent to the backwash water inlet 33. The flow path 33a also includes a first water supply short-circuit branch 351, and the acid supply flow path 31a also includes a first liquid supply short-circuit branch 352. The sewage treatment system 100 also includes a first three-way valve 61 and a second three-way valve 62. The three connecting ports of the first three-way valve 61 are respectively connected to the first heat exchange flow channel section 411, the first water supply short-circuit branch 351 and the backwash water inlet 33. The three connecting ports of the second three-way valve 62 are respectively connected to the second heat exchange flow channel section 412, the first liquid supply short-circuit branch 352 and the acid inlet 31.

[0070] Water is introduced into the resin exchange column 3 through the water supply path 33a. The acid adsorbed by the resin is washed by the water and then enters the acid treatment path 32a for subsequent concentration treatment. The remaining metal salt solution enters the metal liquid treatment path 34a.

[0071] By switching between the first three-way valve 61 and the second three-way valve 62, the temperature of the water and acid entering the resin exchange column 3 can be adjusted so that their temperatures can be adapted to the efficient adsorption of the resin in the resin exchange column 3.

[0072] It should be noted that the temperature of the acid solution in the pickling tank 1 is often higher than the water temperature in the water supply path 33a. When the temperature in the acid supply path 31a is abnormally high, it is necessary to further adjust the temperature in the acid supply path 31a. In some embodiments, a refrigerant can be used for forced cooling, which will be described in detail below.

[0073] Specifically, the wastewater treatment system 100 further includes a transition tank 2, and the acid supply flow path 31a further includes a tank inlet main path and a tank outlet main path that are both connected to the transition tank 2. The tank outlet main path is connected to the acid inlet 31, and the tank inlet main path is connected to the second three-way valve 62. The first temperature sensor 51 is located on the tank outlet main path, and a third temperature sensor 53 is also located on the tank inlet main path.

[0074] The heat processor 4 also includes a refrigerant cooling system 7, on which a refrigerant circulation path is formed. A compressor 71, a throttling device 72 and an evaporator core tube 73 are provided on the refrigerant circulation path. The evaporator core tube 73 is arranged around the transition groove 2.

[0075] Refrigerant flows through the refrigerant cooling system 7. After passing through the compressor 71, condenser and throttling device 72, the refrigerant forms a low-temperature refrigerant. After passing through the evaporator core tube 73, the low-temperature refrigerant releases cold energy into the transition tank 2, thereby cooling the transition tank 2.

[0076] Of course, when the temperature is low, a four-way valve can be installed in the refrigerant cooling system 7. The four-way valve can be used to directly switch the exhaust port of the compressor 71 to the evaporator core tube 73, so that the evaporator core tube 73 releases heat to the outside, thereby heating the transition tank 2. It should be noted that the heating mode can be used under extreme conditions, and the cooling mode is generally used.

[0077] In addition, when the temperature regulation of the water supply path 33a requires cooling or heating, it can be achieved by heating or cooling devices respectively. When cooling, the cold end of the semiconductor cooling chip can radiate cold energy to the water supply path 33a. When heating, the hot end of the semiconductor cooling chip can radiate heat to the water supply path 33a.

[0078] In another embodiment, a circulating cooling method can also be used. Specifically, a return acid flow path 37 is formed on the sewage treatment system 100. One end of the return acid flow path 37 is connected to the transition tank 2, and the other end is connected to the acid supply flow path 31a. It is located on the side of the second heat exchange channel section 412 away from the second three-way valve 62. The acid that does not meet the requirements is reheated through the return acid flow path 37 until the temperature requirement is met.

[0079] It should be noted that a shut-off valve and / or a third pressurizing pump may be provided in the return acid flow path 37. The return flow is forced by the third pressurizing pump. When the return flow is not required, the shut-off valve is controlled by the control device to stop the flow of the return acid flow path 37.

[0080] When the acid enters the resin exchange column 3, it is also necessary to filter the acid in the acid supply flow path 31a. Specifically, the acid supply flow path 31a also includes an acid supply main path and two filter flow paths 36. The acid supply main path is switched to one of the two filter flow paths 36 through a third three-way valve 63. Each filter flow path 36 is equipped with a filter 9 and a first pressure sensor 81. A second pressure sensor 82 is also provided on the acid supply main path.

[0081] The filter 9 achieves the filtration function. When the filtration effect of one of the filter flow sections 36 is poor or fails, the third three-way valve 63 can switch the other filter flow section 36 to be open, so as to replace the filter 9 without stopping the machine and ensure that the acid supply flow path 31a is always in a flowing state.

[0082] In some embodiments, a first pressurizing pump 101 is provided on the acid supply flow path 31a to facilitate the flow of acid in the acid supply flow path 31a, and a second pressurizing pump 102 is provided on the acid treatment flow path 32a to facilitate the flow of acid in the acid treatment flow path 32a.

[0083] The above is a detailed description of the wastewater treatment system 100 provided by the present invention. Based on the above-described wastewater treatment system 100, the wastewater treatment method provided by the present invention will be described in detail below.

[0084] In one embodiment, step S20 further includes the following steps:

[0085] S201, The first actual temperature value collected by the first temperature sensor 51;

[0086] S202, The second actual temperature value collected by the second temperature sensor 52;

[0087] S203. Select the larger of the first actual temperature value and the second actual temperature value as the actual temperature value of the object;

[0088] S204. When the actual temperature value of the object is less than the first preset temperature value, the first three-way valve 61 is controlled by the control device to switch the first water supply short-circuit branch 351 to connect to the backwash water inlet 33, and the second three-way valve 62 is controlled to switch the first liquid supply short-circuit branch 352 to connect to the acid liquid inlet 31.

[0089] S205. When the actual temperature value of the object is greater than the second preset temperature value, at least the first three-way valve 61 and the second three-way valve 62 are controlled by the control device to cool down the acid flowing through the acid inlet 31, wherein the second preset temperature value is greater than the first preset temperature value.

[0090] Generally speaking, the acid solution after pickling is at a high temperature and needs to be cooled down, while the water temperature in the water tank 11 connected to the water supply path 33a is at room temperature. Therefore, heat exchange between the two can be used to treat the acid solution.

[0091] In the above processing steps, the focus is on the higher temperature. When the higher temperature is relatively small and meets the requirements for high adsorption efficiency, no cooling treatment is needed. When the higher temperature is relatively large and does not meet the requirements for high adsorption efficiency, temperature regulation is achieved through the heat exchange between the water supply path 33a and the acid supply path 31a. On the one hand, the temperature of the acid is reduced, and on the other hand, the temperature of the water supply is increased, so that the liquid entering the resin exchange column 3 can have a good temperature and achieve high-efficiency adsorption. The above processing method does not require an additional cold source or heat source, is economical, and has a simple structure to implement.

[0092] In one embodiment, step S205 further includes the following steps:

[0093] S2051. When the actual temperature value of the object is greater than the second preset temperature value and less than or equal to the third preset temperature, the first three-way valve 61 is controlled by the control device to switch the first heat exchange channel section 411 to connect to the backwash water inlet 33, and the second three-way valve 62 is controlled to switch the second heat exchange channel section 412 to connect to the acid inlet 31.

[0094] S2052. When the actual temperature value of the object is greater than the third preset temperature and less than or equal to the fourth preset temperature, the first three-way valve 61 is controlled by the control device to switch the first water supply short-circuit branch 351 to connect to the backwash water inlet 33, and the second three-way valve 62 is controlled to switch the first liquid supply short-circuit branch 352 to connect to the acid liquid inlet 31, and the compressor 71 is controlled to start, and the throttling device 72 is operated.

[0095] S2053. When the actual temperature value of the object is greater than the fourth preset temperature, the control device controls the first three-way valve 61 to switch the first heat exchange flow channel section 411 to connect to the backwash water inlet 33, and controls the second three-way valve 62 to switch the second heat exchange flow channel section 412 to connect to the acid inlet 31, and controls the compressor 71 to start, and the throttling device 72 to work, wherein the second preset temperature value is less than the third preset temperature, and the third preset temperature value is less than the fourth preset temperature.

[0096] In the above processing steps, when the temperature is high, the temperature is adjusted only through the heat exchange between the water supply path 33a and the acid supply path 31a; when the temperature is very high, the acid supply path 31a is cooled only through the refrigerant cooling system 7; when the temperature is abnormally high, the water supply path 33a and the acid supply path 31a are cooled simultaneously through the heat exchange between them, as well as the forced cooling treatment of the refrigerant cooling system 7. By using different cooling methods to adjust the temperature of the water supply path 33a and / or the acid supply path 31a, the temperature of the water supply path 33a and the acid supply path 31a can be adjusted more precisely, thereby improving the adsorption efficiency.

[0097] Of course, in this embodiment, when the heat exchanger 41 is not working, a separate temperature control device can be used to adjust the temperature of the water supply path 33a, such as a semiconductor cooling chip for rapid temperature control.

[0098] In one embodiment, step S2053 further includes the following steps:

[0099] S20531. Calculate the ratio K of the actual temperature value of the object to the fourth preset temperature;

[0100] S20532. When 1.5 < K ≤ 2, the throttling device 72 is controlled to be at the first opening degree by the control device;

[0101] S20533. When 1 < K ≤ 1.5, the throttling device 72 is controlled to be at the second opening degree by the control device;

[0102] S20534. When 2 < K, the throttling device 72 is controlled to be at a third opening degree by the control device, wherein the first opening degree is less than the second opening degree and the first opening degree is greater than the third opening degree;

[0103] In the refrigerant cooling system 7, the temperature of the refrigerant flowing through the evaporator core tube 73 can be controlled by controlling the opening degree of the throttling device 72. In some embodiments, when 1.5 < K ≤ 2, the throttling device 72 is controlled by the control device to be at the first opening degree, which is an intermediate opening value, and the throttling device 72 is normally throttling. When 1 < K ≤ 1.5, the acid in the acid supply flow path 31a has a relatively small temperature difference deviation. Thus, the opening degree of the throttling device 72 can be increased to reach the second opening degree, thereby reducing the energy consumption of the entire refrigerant cooling system 7. When 2 < K, the acid in the acid supply flow path 31a has a relatively significant temperature difference deviation. Thus, the opening degree of the throttling device 72 can be decreased to reach the third opening degree, achieving rapid and efficient temperature regulation. According to different needs, precise regulation is achieved.

[0104] In some embodiments, the wastewater treatment method further includes the following steps:

[0105] S50. Multiple first actual pressure values ​​collected by multiple first pressure sensors 81, and second actual pressure values ​​collected by the second pressure sensor 82;

[0106] S60. Select the filter flow segment 36 with a pressure value that is not zero as the first filter flow segment 36, and the other as the second filter flow segment 36. Select the pressure value of the first filter flow segment 36 as the actual pressure value of the object.

[0107] S70. Calculate the pressure difference between the actual pressure value of the object and the second actual pressure value;

[0108] S80. When the pressure difference meets the preset condition, the control device controls the third three-way valve 63 to switch the acid supply trunk line to the second filter flow section 36.

[0109] The filter 9 achieves the filtration function. The filtration effect is judged by multiple first pressure sensors 81 and second pressure sensors 82. When the filtration effect of one of the filter flow sections 36 is poor or fails, the third three-way valve 63 can switch the other filter flow section 36 to be open, so as to replace the filter 9 without stopping the machine and ensure that the acid supply flow path 31a is always in a flowing state.

[0110] The above description is merely an optional embodiment of the present invention and does not limit the patent scope of the present invention. All equivalent structural transformations made using the contents of the present invention's specification and drawings under the inventive concept of the present invention, or direct / indirect applications in other related technical fields, are included within the patent protection scope of the present invention.

Claims

1. A wastewater treatment method, based on a wastewater treatment system, said wastewater treatment system comprising an acid washing tank, a resin exchange column, and a heat processor, wherein an acid supply flow path and a water supply flow path are formed on said wastewater treatment system, characterized in that, The wastewater treatment method includes the following steps: The used acid solution in the pickling tank is discharged to the acid supply path; A heat treatment device is used to regulate the temperature of the acid in the acid supply path; The temperature-controlled acid solution is introduced into the resin exchange column, and water is introduced into the resin exchange column through the water supply path. The acid solution after being treated by the resin exchange column is then evaporated and concentrated. The resin exchange column has an acid inlet, an acid outlet, a backwash water inlet, and a molten metal outlet. The wastewater treatment system also includes an acid treatment flow path and a molten metal treatment flow path. The water supply flow path connects to the backwash water inlet, the acid supply flow path connects to the acid inlet, the acid treatment flow path connects to the acid outlet, and the molten metal treatment flow path connects to the molten metal outlet. The heat processor includes a heat exchanger with two mutually exchanging heat flow channels: a first heat exchange channel section and a second heat exchange channel section. The first heat exchange channel section is located on the water supply flow path, and the second heat exchange channel section is located on the acid supply flow path. A first temperature sensor is provided on the acid supply flow path and is located near the acid inlet. A second temperature sensor is provided on the water supply flow path and is located near the backwash water inlet. The water supply flow path also includes a first water supply short-circuit branch. The acid supply flow path also includes a first liquid supply short-circuit branch. The wastewater treatment system also includes a first three-way valve and a second three-way valve. The three ports of the first three-way valve are respectively connected to the first heat exchange flow path section, the first water supply short-circuit branch and the backwash water inlet. The three ports of the second three-way valve are respectively connected to the second heat exchange flow path section, the first liquid supply short-circuit branch and the acid inlet. The method of using a heat processor to regulate the temperature of the acid in the acid supply path includes: The first actual temperature value collected by the first temperature sensor; The second actual temperature value acquired by the second temperature sensor; The larger of the first actual temperature value and the second actual temperature value is selected as the actual temperature value of the object. When the actual temperature of the object is less than the first preset temperature value, the control device controls the first three-way valve to switch the first water supply short-circuit branch to connect to the backwash water inlet, and controls the second three-way valve to switch the first liquid supply short-circuit branch to connect to the acid inlet. When the actual temperature of the object is greater than the second preset temperature value, the control device controls at least the first three-way valve and the second three-way valve to operate, so as to cool down the acid flowing through the acid inlet, wherein the second preset temperature value is greater than the first preset temperature value.

2. The wastewater treatment method as described in claim 1, characterized in that, The wastewater treatment system also includes a transition tank, and the acid supply flow path also includes a tank inlet main line and a tank outlet main line that are both connected to the transition tank. The tank outlet main line is connected to the acid inlet, and the tank inlet main line is connected to the second three-way valve. The first temperature sensor is located on the tank outlet main line. The heat processor also includes a refrigerant cooling system, on which a refrigerant circulation path is formed. A compressor, a throttling device, and an evaporator core tube are provided on the refrigerant circulation path, and the evaporator core tube is arranged around the transition groove. When the actual temperature of the object is greater than the second preset temperature value, the control device controls at least the first three-way valve and the second three-way valve to operate, in order to cool the acid flowing through the acid inlet, including: When the actual temperature of the object is greater than the second preset temperature value and less than or equal to the third preset temperature, the control device controls the first three-way valve to switch the first heat exchange channel section to connect to the backwash water inlet, and controls the second three-way valve to switch the second heat exchange channel section to connect to the acid inlet. When the actual temperature of the object is greater than the third preset temperature and less than or equal to the fourth preset temperature, the control device controls the first three-way valve to switch the first water supply short-circuit branch to connect to the backwash water inlet, controls the second three-way valve to switch the first liquid supply short-circuit branch to connect to the acid inlet, controls the compressor to start, and the throttling device to work. When the actual temperature of the object is greater than the fourth preset temperature, the control device controls the first three-way valve to switch the first heat exchange channel section to connect to the backwash water inlet, and controls the second three-way valve to switch the second heat exchange channel section to connect to the acid inlet, and controls the compressor to start, and the throttling device to work, wherein the second preset temperature value is less than the third preset temperature, and the third preset temperature value is less than the fourth preset temperature.

3. The wastewater treatment method as described in claim 2, characterized in that, When the actual temperature of the object is greater than the fourth preset temperature, the control device controls the first three-way valve to switch the first heat exchange channel section to connect to the backwash water inlet, and controls the second three-way valve to switch the second heat exchange channel section to connect to the acid inlet, and controls the compressor to start, and the throttling device to operate, including: Calculate the ratio K between the actual temperature of the object and the fourth preset temperature; When 1.5 < K ≤ 2, the throttling device is controlled to be at the first opening degree by the control device; When 1 < K ≤ 1.5, the throttling device is controlled to be at the second opening degree by the control device; When 2 < K, the throttling device is controlled by the control device to be at a third opening degree, wherein the first opening degree is less than the second opening degree and the first opening degree is greater than the third opening degree.

4. The wastewater treatment method as described in claim 2, characterized in that, The acid supply flow path also includes an acid supply main path and two filter flow paths. The acid supply main path is switched to one of the two filter flow paths through a third three-way valve. Each filter flow path is equipped with a filter and a first pressure sensor. A second pressure sensor is also provided on the acid supply main path. Multiple first actual pressure values ​​are collected by multiple first pressure sensors, and second actual pressure values ​​are collected by the second pressure sensor; The filter flow segment with a non-zero pressure value is selected as the first filter flow segment, and the other is selected as the second filter flow segment. The pressure value of the first filter flow segment is selected as the actual pressure value of the object. Calculate the pressure difference between the actual pressure value of the object and the second actual pressure value; When the pressure difference meets the preset conditions, the control device controls the third three-way valve to switch the acid supply trunk line to the second filtration flow section.

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