Wastewater comprehensive treatment device

Abstract

The utility model provides a wastewater comprehensive treatment device. The wastewater comprehensive treatment device comprises a first wastewater treatment reactor and a second wastewater treatment reactor, the hydrochloric acid wastewater pipeline and the solid calcium carbonate feeding pipeline are respectively communicated to the first wastewater treatment reactor; the second wastewater treatment reactor is connected to the first wastewater treatment reactor through a first liquid discharge pipeline of the first wastewater treatment reactor; the sodium sulfate wastewater pipeline is communicated to the second wastewater treatment reactor; the solid-liquid separation device is used for receiving the sodium sulfate wastewater treated by the second wastewater treatment reactor; and the solid collecting box and the liquid collecting tank are respectively used for receiving the solid and the liquid from the solid-liquid separation device. The comprehensive wastewater treatment device provided by the embodiment of the utility model at least can treat hydrochloric acid wastewater and sodium sulfate wastewater at the same time.

Description

Technical Field

[0001] The utility model relates to a wastewater treatment device, in particular to a device for comprehensively treating hydrochloric acid wastewater and sodium sulfate wastewater. Background Art

[0002] Hydrochloric acid is a commonly used chemical product, which is widely used in the processes of chemical industry, metallurgy, metal surface treatment, rare earth production, etc. At the same time, a large amount of hydrochloric acid wastewater is generated. For example, a large amount of hydrochloric acid wastewater is generated in the process of producing crystalline aluminum chloride, which is difficult to treat and causes pollution and damage to the environment. The treatment and / or recycling of hydrochloric acid wastewater is a major problem in wastewater treatment.

[0003] At present, the main treatment methods for hydrochloric acid wastewater at home and abroad are acid-base neutralization method, hydrochloric acid regeneration method and evaporation crystallization method.

[0004] Acid-base neutralization method: Generally, lime, carbide slag or caustic soda is used for neutralization treatment to make the pH value reach the national discharge standard and then discharged. Its disadvantages are high cost of neutralization agents, large expenses, limited treatment capacity of waste acid, and ineffective utilization of waste liquid resources. The gas generated in the treatment process diffuses, causing secondary pollution.

[0005] Hydrochloric acid regeneration method: By means of heating evaporation and spray combustion, the investment in device equipment is large and the operation and maintenance cost is high, which is generally difficult for small and medium-sized enterprises to bear.

[0006] Evaporation crystallization method: Adopt steam indirect heating and negative pressure evaporation concentration process. The gas generated by evaporation is condensed into dilute hydrochloric acid by a condenser and returned to the production device for reuse. This process has large investment, high operation and maintenance costs, high equipment energy consumption, and intermittent operation wastes working hours.

[0007] Sodium sulfate wastewater is a common salt-containing wastewater in industries such as chemical industry, printing and dyeing, and metallurgy. Due to its high salt content, it is difficult to be thoroughly treated by wastewater treatment methods such as biochemical degradation. If directly discharged into the natural environment, it will cause the salinity of water bodies and soil to increase, damage the soil structure, cause soil compaction and salinization, and affect plant growth and farmland productivity.

[0008] It is difficult to remove salt from sodium sulfate wastewater. The common treatment method is to adopt a multi-effect evaporation crystallization process to recover sodium sulfate. However, the investment and operation costs of multi-effect evaporation crystallization are high. At the same time, the recovered sodium sulfate may not have a suitable application market and can only be treated as hazardous waste, with high treatment costs. Utility Model Content

[0009] In view of the above problems existing in the prior art, the embodiments of the present application propose a device for comprehensive wastewater treatment, which at least has low investment and operation costs and can treat hydrochloric acid wastewater and sodium sulfate wastewater simultaneously.

[0010] According to one aspect of the present application, a device for comprehensive wastewater treatment is provided. The device for comprehensive wastewater treatment includes: a first wastewater treatment reactor; a hydrochloric acid wastewater pipeline and a solid calcium carbonate feeding pipeline, which are respectively connected to the first wastewater treatment reactor; a second wastewater treatment reactor, which is connected to the first wastewater treatment reactor through a first liquid discharge pipeline of the first wastewater treatment reactor; a sodium sulfate wastewater pipeline, which is connected to the second wastewater treatment reactor; a solid-liquid separation device, which receives the sodium sulfate wastewater treated by the second wastewater treatment reactor; a solid collection box and a liquid collection pool, which respectively receive the solid and the liquid from the solid-liquid separation device.

[0011] In some embodiments, the solid-liquid separation device is a centrifuge or a vacuum belt filter.

[0012] In some embodiments, an exhaust port is provided on the first wastewater treatment reactor, and an exhaust gas pipeline is connected to the exhaust port, and a gas storage tank is connected to the exhaust gas pipeline.

[0013] In some embodiments, a drying tank and an airbag are sequentially arranged between the exhaust gas pipeline and the gas storage tank.

[0014] In some embodiments, the hydrochloric acid wastewater pipeline is further connected to a hydrochloric acid wastewater tank, and the hydrochloric acid wastewater tank and the first wastewater treatment reactor are respectively arranged at both ends of the hydrochloric acid wastewater pipeline.

[0015] In some embodiments, the hydrochloric acid wastewater tank is further connected to the hydrochloric acid wastewater discharge pipeline of the crystalline aluminum chloride production device.

[0016] In some embodiments, the sodium sulfate wastewater pipeline is further connected to a sodium sulfate wastewater tank, and the sodium sulfate wastewater tank and the second wastewater treatment reactor are respectively arranged at both ends of the sodium sulfate wastewater pipeline.

[0017] In some embodiments, the sodium sulfate wastewater tank is further connected to the sodium sulfate wastewater discharge pipeline of the photoinitiator BDK production device.

[0018] In some embodiments, the gas storage tank is connected to the mesitylbenzoyl chloride production device.

[0019] In some embodiments, the device for comprehensive wastewater treatment further includes a monitor and a valve arranged on the first liquid discharge pipeline, and the monitor monitors the reaction process in the first wastewater treatment reactor to control the opening and closing of the valve.

[0020] The beneficial technical effects of the present utility model are as follows:

[0021] In the prior art, the device and equipment for treating hydrochloric acid wastewater, such as the hydrochloric acid regeneration method and the evaporation crystallization method, and the device and equipment for multi-effect evaporation crystallization of sodium sulfate wastewater have the disadvantages of large investment and high operation and maintenance costs; while the wastewater comprehensive treatment device in the embodiment of the present application is at least simple in structure and low in investment and operation costs. By using the wastewater comprehensive treatment device of the present application, hydrochloric acid wastewater can be treated with calcium carbonate in the first wastewater treatment reactor to become calcium chloride solution, and the calcium chloride solution further enters the second wastewater treatment reactor for reuse - for the treatment of sodium sulfate wastewater, which can avoid the direct discharge of calcium chloride solution in the prior art (a large amount of calcium chloride will cause the increase of water salinity, damage the water ecosystem, or cause land salinization, affecting plant growth and farmland productivity) or re-treatment. In the second wastewater treatment reactor, sodium sulfate wastewater is treated with calcium chloride solution to become easily recyclable general solid waste calcium sulfate and sodium chloride brine from which sodium chloride by-products can be easily obtained, which can solve the problem of difficult salt production of sodium sulfate wastewater in the prior art. Compared with the prior art, the device of the present application can comprehensively and overall treat hydrochloric acid wastewater and sodium sulfate wastewater. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the following will briefly introduce the drawings required to be used in the embodiments. Obviously, the drawings described below are only some embodiments of the present application. For those of ordinary skill in the art, other drawings can be obtained based on these drawings without creative efforts. It should be noted that each device / device is only for illustrative purposes.

[0023] Figure 1 It is a schematic structural diagram of a wastewater comprehensive treatment device according to an embodiment of the present application.

[0024] Figure 2 It is a schematic structural diagram of a wastewater comprehensive treatment device according to another embodiment of the present application.

[0025] Figure 3 It is a schematic structural diagram of a wastewater comprehensive treatment device according to another embodiment of the present application.

[0026] Figure 4 It is a schematic structural diagram of a wastewater comprehensive treatment device according to another embodiment of the present application.

[0027] Figure 5 It is a schematic structural diagram of a wastewater comprehensive treatment device according to another embodiment of the present application.

[0028] Figure 6 It is a schematic structural diagram of a wastewater comprehensive treatment device according to another embodiment of the present application.

[0029] The description of the reference numerals in the drawings is as follows: 10 first wastewater treatment reactor, 11 hydrochloric acid wastewater pipeline, 13 solid calcium carbonate feeding pipeline, 14 monitor, 15 first liquid discharge pipeline, 16 valve, 17 sodium sulfate wastewater pipeline, 18 conveying pipeline, 19 solid-liquid separation device, 20 second wastewater treatment reactor, 21 solid collection box, 22 stirrer, 23 liquid collection pool, 25 exhaust port, 27 discharged gas pipeline, 29 gas storage tank, 31 drying tank, 33 airbag, 35 hydrochloric acid wastewater tank, 37 crystalline aluminum chloride production device, 38 hydrochloric acid wastewater discharge pipeline, 39 sodium sulfate wastewater tank, 41 photoinitiator BDK production device, 42 sodium sulfate wastewater discharge pipeline. Detailed implementation manners

[0030] Next, the technical solutions in the embodiments of the present application will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present application. Obviously, the described embodiments are only a part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art belong to the scope of protection of the present application.

[0031] The following disclosure provides many different embodiments or examples for implementing different features of the provided subject matter. Specific examples of devices will be described below to simplify the present invention. Of course, these are only examples and are not intended to limit the present invention. The present invention may repeat reference numerals and / or letters in various examples. Such repetition is only for the sake of simplicity and clarity and does not in itself indicate a relationship between the various embodiments and / or configurations discussed.

[0032] In addition, without conflict, the embodiments in the present application and the features in the embodiments may be combined with each other. Next, the present application will be described in detail with reference to the drawings and in conjunction with the embodiments. When describing a specific figure, other devices not described shown in the figure may be set according to actual needs and are not intended to limit the present application.

[0033] Figure 1 is a schematic structural diagram of a device for comprehensive wastewater treatment according to an embodiment of the present application. Refer to Figure 1As shown, according to some embodiments of the present application, a device for comprehensive wastewater treatment is provided. The device for comprehensive wastewater treatment includes a first wastewater treatment reactor 10, a second wastewater treatment reactor 20, a hydrochloric acid wastewater pipeline 11, a solid calcium carbonate feeding pipeline 13, a first liquid discharge pipeline 15, a sodium sulfate wastewater pipeline 17, a solid-liquid separation device 19, a solid collection box 21, and a liquid collection pool 23. The hydrochloric acid wastewater pipeline 11 and the solid calcium carbonate feeding pipeline 13 are respectively connected to the first wastewater treatment reactor 10. The second wastewater treatment reactor 20 is connected to the first wastewater treatment reactor 10 through the first liquid discharge pipeline 15 of the first wastewater treatment reactor 10. The sodium sulfate wastewater pipeline 17 is connected to the second wastewater treatment reactor 20. The solid-liquid separation device 19 receives the sodium sulfate wastewater treated by the second wastewater treatment reactor 20. The solid collection box 21 and the liquid collection pool 23 respectively receive the solid and liquid from the solid-liquid separation device 19. The device for comprehensive wastewater treatment provided by the embodiments of the present application can at least treat hydrochloric acid wastewater and sodium sulfate wastewater simultaneously in a set of devices. The reaction liquid after treating the hydrochloric acid wastewater is used for treating the sodium sulfate wastewater, which can solve the problems of difficult treatment of hydrochloric acid wastewater and difficult salt production of sodium sulfate wastewater, reduce the treatment difficulty of both at the same time, and the investment and operation cost of the device is low.

[0034] The solid-liquid separation device 19 receives the sodium sulfate wastewater treated by the second wastewater treatment reactor 20. The sodium sulfate wastewater treated by the second wastewater treatment reactor 20 can be discharged into the solid-liquid separation device 19 through the discharge port. In some embodiments, the solid-liquid separation device 19 can be directly arranged below the discharge port of the second wastewater treatment reactor 20. In some embodiments, the treated sodium sulfate wastewater enters the conveying pipeline 18 through the discharge port of the second wastewater treatment reactor 20 and then is discharged into the solid-liquid separation device 19. The solid-liquid separation device 19 and the discharge port / conveying pipeline 18 can be directly connected in contact or can be spaced apart by a certain distance, as long as the treated sodium sulfate wastewater can be discharged into the solid-liquid separation device 19. The solid collection box 21 and the liquid collection pool 23 respectively receive the solid and liquid from the solid-liquid separation device 19. In some embodiments, the solid and liquid can be respectively conveyed from the solid-liquid separation device 19 to the solid collection box 21 and the liquid collection pool 23 through pipelines. In other embodiments, the solid and liquid can also be directly conveyed from different discharge ports of the solid-liquid separation device 19 to the solid collection box 21 and the liquid collection pool 23 respectively, and the solid-liquid separation device 19 does not contact the liquid to the solid collection box 21 and the liquid collection pool 23. It should be understood that Figure 1 the styles shown in the embodiments are only for the sake of simplicity and clarity in illustration and are not intended to be limiting.

[0035] In some embodiments, the solid-liquid separation device 19 can be a centrifuge or a vacuum belt filter. In the embodiment where the solid-liquid separation device 19 is a vacuum belt filter, the sodium sulfate wastewater treated by the second wastewater treatment reactor 20 (the treated sodium sulfate wastewater includes calcium sulfate insolubles and sodium chloride brine) can be directly discharged from the discharge port of the second wastewater treatment reactor 20 into the feed port of the vacuum belt filter. The solids in the treated sodium sulfate wastewater are collected at the discharge end of the vacuum belt filter, and the liquid in the treated sodium sulfate wastewater flows into the liquid collection pipe of the vacuum belt filter and is collected. Using a vacuum belt filter for solid-liquid separation has a good separation effect, and the salt content of the sodium chloride brine can directly meet the treatment requirements when it is 20%-30%.

[0036] In some embodiments, a stirrer 22 driven by a motor is installed on the first wastewater treatment reactor 10. In some embodiments, the wastewater comprehensive treatment device may further include a monitor 14 and a valve 16 provided on the first liquid discharge pipe 15. The monitor 14 monitors the reaction process in the first wastewater treatment reactor 10 to control the opening and closing of the valve 16. In some embodiments, the monitor 14 can be a pH meter. By monitoring the pH value in the first wastewater treatment reactor 10 to judge the reaction process, when the pH value is close to 7, it represents that the reaction is complete (hydrochloric acid reacts with calcium carbonate to obtain a calcium chloride solution), and the valve 16 is opened, and the calcium chloride liquid is discharged into the second wastewater treatment reactor 20. It should be understood that Figure 1 the stirrer 22, monitor 14, and valve 16 shown in can be optionally provided.

[0037] In some embodiments, the first wastewater treatment reactor 10 and the second wastewater treatment reactor 20 can be an inverted conical opening structure, a cylindrical structure, a square columnar structure, etc. When the first wastewater treatment reactor 10 and the second wastewater treatment reactor 20 are of an inverted conical opening structure, it is convenient for the reaction liquid to converge and discharge.

[0038] Figure 1 The specific installation positions and shapes of the various devices in are only for the sake of simple and clear illustration, and are not intended to limit the present application.

[0039] Figure 2 is a schematic structural diagram of a wastewater comprehensive treatment device according to another embodiment of the present application. Refer to Figure 2As shown, in some embodiments, an exhaust port 25 is provided on the first wastewater treatment reactor 10. A discharge gas pipeline 27 is communicatively connected to the exhaust port 25, and a gas storage tank 29 is communicatively connected to the discharge gas pipeline 27. One end of the discharge gas pipeline 27 can be connected to the first wastewater treatment reactor 10 through the exhaust port 25, and the other end of the discharge gas pipeline 27 is connected to the gas storage tank 29. The first wastewater treatment reactor 10, the exhaust port 25, the discharge gas pipeline 27, and the gas storage tank 29 are in communication. The gas storage tank 29 is a carbon dioxide storage tank for storing the carbon dioxide generated by the reaction of hydrochloric acid wastewater and calcium carbonate in the first wastewater treatment reactor 10. The carbon dioxide is collected, which can avoid being discharged into the air to pollute the environment and can also be utilized as a resource to create value.

[0040] Figure 3 is a schematic structural diagram of a wastewater comprehensive treatment device according to another embodiment of the present application. Refer to Figure 3 As shown, in some embodiments, a drying tank 31 and an airbag 33 connected in sequence may also be provided between the discharge gas pipeline 27 and the gas storage tank 29 to obtain dry gas after water removal.

[0041] Continue to refer to Figure 3 As shown, in some embodiments, the gas storage tank 29 can be communicatively connected to a mesitylbenzoyl chloride production device (not shown), and the carbon dioxide after water removal can be directly used for the production of mesitylbenzoyl chloride, so that the resources are fully utilized.

[0042] Figure 4 is a schematic structural diagram of a wastewater comprehensive treatment device according to another embodiment of the present application. Refer to Figure 4 As shown, in some embodiments, the hydrochloric acid wastewater pipeline 11 is also communicatively connected to a hydrochloric acid wastewater tank 35, and the hydrochloric acid wastewater tank 35 and the first wastewater treatment reactor 10 are respectively arranged at both ends of the hydrochloric acid wastewater pipeline 11. That is, the hydrochloric acid wastewater pipeline 11 communicates the hydrochloric acid wastewater tank 35 and the first wastewater treatment reactor 10, and the hydrochloric acid wastewater in the hydrochloric acid wastewater tank 35 can be transported to the first wastewater treatment reactor 10 through the hydrochloric acid wastewater pipeline 11.

[0043] Continue to refer to Figure 4 , in some embodiments, the hydrochloric acid wastewater tank 35 is also communicatively connected to a hydrochloric acid wastewater discharge pipeline 38 of a crystalline aluminum chloride production device 37. That is, the wastewater comprehensive treatment device of the present application can treat the hydrochloric acid wastewater generated by the crystalline aluminum chloride production device 37.

[0044] In other embodiments, the hydrochloric acid wastewater pipeline 11 can be communicatively connected to other production devices, that is, the wastewater comprehensive treatment device can treat the hydrochloric acid wastewater generated by other production devices.

[0045] Figure 5The structural schematic diagram of the device for comprehensive wastewater treatment according to another embodiment of the present application. Refer to Figure 5 As shown, in some embodiments, the sodium sulfate wastewater pipe 17 is also connected to the sodium sulfate wastewater tank 39. The sodium sulfate wastewater tank 39 and the second wastewater treatment reactor 20 are respectively arranged at both ends of the sodium sulfate wastewater pipe 17. That is, the sodium sulfate wastewater pipe 17 connects the sodium sulfate wastewater tank 39 and the second wastewater treatment reactor 20, and the sodium sulfate wastewater in the sodium sulfate wastewater tank 39 can be transported to the second wastewater treatment reactor 20 through the sodium sulfate wastewater pipe 17.

[0046] Continue to refer to Figure 5 , in some embodiments, the sodium sulfate wastewater tank 39 is also connected to the sodium sulfate wastewater discharge pipe 42 of the photoinitiator BDK production device 41. That is, the device for comprehensive wastewater treatment of the present application can treat the sodium sulfate wastewater generated by the photoinitiator BDK production device 41.

[0047] In other embodiments, the sodium sulfate wastewater pipe 17 can be connected to other production devices, that is, the device for comprehensive wastewater treatment can treat the sodium sulfate wastewater generated by other production devices.

[0048] Figure 6 The structural schematic diagram of the device for comprehensive wastewater treatment according to another embodiment of the present application. Refer to Figure 6 As shown, different from the embodiment shown in Figure 1 , the embodiment shown in Figure 6 also includes a crystalline aluminum chloride production device 37, a hydrochloric acid wastewater discharge pipe 38, a hydrochloric acid wastewater tank 35, a photoinitiator BDK production device 41, a sodium sulfate wastewater discharge pipe 42, a sodium sulfate wastewater tank 39, an exhaust port 25, an exhaust gas pipe 27, a drying tank 31, an airbag 33, and a gas storage tank 29. The crystalline aluminum chloride production device 37, the hydrochloric acid wastewater discharge pipe 38, the hydrochloric acid wastewater tank 35, and the hydrochloric acid wastewater pipe 11 are sequentially connected. The photoinitiator BDK production device 41, the sodium sulfate wastewater discharge pipe 42, the sodium sulfate wastewater tank 39, and the sodium sulfate wastewater pipe 17 are sequentially connected to the second wastewater treatment reactor 20. At the same time, the exhaust port 25 arranged on the first wastewater treatment reactor 10 is sequentially communicated with the exhaust gas pipe 27, the drying tank 31, the airbag 33, and the gas storage tank 29.

[0049] Refer to Figure 6 As shown, in some embodiments, through Figure 6The shown device for comprehensive wastewater treatment is such that the hydrochloric acid wastewater generated by the crystalline aluminum chloride production device 37 enters the first wastewater treatment reactor 10 and reacts with the solid calcium carbonate entering the first wastewater treatment reactor 10 through the solid calcium carbonate feeding pipeline 13 to generate calcium chloride solution and gaseous carbon dioxide; the carbon dioxide enters the exhaust gas pipeline 27 through the exhaust port 25 and then successively passes through the drying tank 31 and the airbag 33 and is finally collected in the gas storage tank 29. The carbon dioxide in the gas storage tank 29 can be further transported to the mesitylbenzoyl chloride production device for the production of mesitylbenzoyl chloride; the calcium chloride solution is discharged from the first wastewater treatment reactor 10 to the second wastewater treatment reactor 20 through the first liquid discharge pipeline 15 connecting the first wastewater treatment reactor 10 and the second wastewater treatment reactor 20; the sodium sulfate wastewater generated by the photoinitiator BDK production device 41 enters the second wastewater treatment reactor 20 and reacts with the calcium chloride solution entering the second wastewater treatment reactor 20 to generate calcium sulfate precipitate and sodium chloride brine; the calcium sulfate precipitate and the sodium chloride brine are respectively collected into the solid collection box 21 and the liquid collection pool 23 through the solid-liquid separation device 19; the calcium sulfate can be packed and treated as general solid waste, and the sodium chloride brine in the filtrate separated by the solid-liquid separation device 19 can be further treated to obtain sodium chloride by-product. The device for comprehensive wastewater treatment of the present application can comprehensively and overallly treat the hydrochloric acid wastewater generated in the production of crystalline aluminum chloride and the sodium sulfate wastewater generated in the production of photoinitiator BDK, realizing the treatment of two kinds of waste liquids in one device, reducing the treatment difficulty of hydrochloric acid wastewater and sodium sulfate wastewater, and finally obtaining general solid waste calcium sulfate and sodium chloride by-product, reducing the cost of treating wastewater and obtaining benefits at the same time. In addition, the investment and operation cost of the device for comprehensive wastewater treatment of the present application is low.

[0050] It should be understood that the wastewater collected in the sodium sulfate wastewater tank 39 generated by the photoinitiator BDK production device 41 mainly includes sodium sulfate, and also includes a small amount of organic substances such as BDK, toluene, unreacted raw materials, etc. After treatment and standing in the second wastewater treatment reactor 20, calcium sulfate precipitate and supernatant liquid (i.e., the separated filtrate) are formed. The main component of the supernatant liquid is sodium chloride brine, and it also includes other impurities such as BDK, toluene, unreacted raw materials, etc. The supernatant liquid can be treated by using activated carbon for decolorization and hydrogen peroxide for oxidizing organic substances, and then the sodium chloride brine can be further treated to obtain sodium chloride by-product.

[0051] With the device for comprehensive wastewater treatment of the present application, hydrochloric acid wastewater can be treated with calcium carbonate in the first wastewater treatment reactor to become calcium chloride solution, and the calcium chloride solution further enters the second wastewater treatment reactor for the treatment of sodium sulfate wastewater, which can avoid the direct discharge (calcium chloride will increase the salinity of water bodies, damage the water ecosystem, or cause soil salinization, affecting plant growth and farmland productivity) or re-treatment of calcium chloride solution. In the second wastewater treatment reactor, sodium sulfate wastewater is treated with calcium chloride solution to become calcium sulfate, a general solid waste that is easy to recycle, and sodium chloride brine from which sodium chloride by-products can be easily obtained, which can avoid directly treating sodium sulfate wastewater that is difficult to desalt.

[0052] The above are only the preferred embodiments of the present application and are not intended to limit the present application. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present application shall be included in the protection scope of the present application.

Claims

1. A device for comprehensive wastewater treatment, characterized in that: include: a first wastewater treatment reactor; The hydrochloric acid wastewater pipeline and the solid calcium carbonate feeding pipeline are respectively connected to the first wastewater treatment reactor; a second wastewater treatment reactor connected to the first wastewater treatment reactor via a first liquid discharge conduit of the first wastewater treatment reactor; a sodium sulfate wastewater pipeline connected to the second wastewater treatment reactor; a solid-liquid separation device, receiving the sodium sulfate wastewater treated by the second wastewater treatment reactor; The solid collecting box and the liquid collecting tank receive the solid and the liquid from the solid-liquid separation device respectively.

2. The device for comprehensive wastewater treatment according to claim 1, characterized in that: The solid-liquid separation device is a centrifuge or a vacuum belt conveyor.

3. The device for comprehensive wastewater treatment according to claim 1, characterized in that: The first wastewater treatment reactor is provided with an exhaust port, the exhaust port is connected with an exhaust gas pipeline, and the exhaust gas pipeline is connected with a gas storage tank.

4. The device for comprehensive wastewater treatment according to claim 3, characterized in that: A drying tank and an air bag connected in sequence are also provided between the exhaust gas pipeline and the gas storage tank.

5. The device for comprehensive wastewater treatment according to claim 1, characterized in that: The hydrochloric acid wastewater pipeline is also connected to a hydrochloric acid wastewater pool, and the hydrochloric acid wastewater pool and the first wastewater treatment reactor are respectively arranged at two ends of the hydrochloric acid wastewater pipeline.

6. The device for comprehensive wastewater treatment according to claim 5, characterized in that: The hydrochloric acid wastewater pool is also connected to the hydrochloric acid wastewater discharge pipeline of the crystalline aluminum chloride production device.

7. The device for comprehensive wastewater treatment according to claim 1, characterized in that: The sodium sulfate wastewater pipeline is also connected to a sodium sulfate wastewater pool, and the sodium sulfate wastewater pool and the second wastewater treatment reactor are respectively arranged at two ends of the sodium sulfate wastewater pipeline.

8. The device for comprehensive wastewater treatment according to claim 7, characterized in that: The sodium sulfate wastewater pool is also connected to the sodium sulfate wastewater discharge pipeline of the photoinitiator BDK production device.

9. The device for comprehensive wastewater treatment according to claim 4, characterized in that: The gas storage tank is connected to the mesitylene trimethylbenzoyl chloride production device.

10. The device for comprehensive wastewater treatment according to claim 1, characterized in that: It also includes a monitor and a valve arranged on the first liquid discharge pipeline, wherein the monitor monitors the reaction progress in the first wastewater treatment reactor to control the opening and closing of the valve.

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