Resourceful treatment system for hazardous waste carnallite

Abstract

The utility model discloses a hazardous waste carnallite resourceful treatment system. A salt dissolving unit of the hazardous waste carnallite resourceful treatment system carries out salt dissolving treatment on hazardous waste carnallite to be treated to obtain hazardous waste carnallite mixed liquid; the pretreatment unit is used for performing impurity removal, filtration and softening treatment on the received hazardous waste impurity salt mixed solution conveyed by the salt dissolving unit; the flat plate nanofiltration salt separation unit is used for carrying out flat plate nanofiltration salt separation on the received hazardous waste carnallite mixed solution pretreated by the pretreatment unit; the high-pressure DTRO concentration reduction unit is used for performing concentration reduction on the received produced water of the flat plate nanofiltration salt separation unit; the sodium chloride evaporative crystallization unit is used for performing evaporative crystallization on the received concentrated water of the high-pressure DTRO concentration reduction unit to generate sodium chloride; the electrocatalytic oxidation hydrogen production unit is used for carrying out electrocatalytic oxidation hydrogen production on the received concentrated water of the flat plate nanofiltration salt separation unit to remove chemical oxygen demand; and the sodium sulfate evaporative crystallization unit evaporates and crystallizes the received concentrated water from which the chemical oxygen demand is removed from the electrocatalytic oxidation hydrogen production unit to produce sodium sulfate. The device solves the problems that all components in the carnallite are difficult to separate, and the purity of the product salt is difficult to effectively improve.

Description

Technical Field

[0001] The utility model relates to a hazardous waste miscellaneous salt resource processing system, belonging to the technical field of miscellaneous salt processing. Background Art

[0002] At present, hazardous waste salts from industries such as electric power, petrochemicals, and coal chemical industry are mainly composed of sodium chloride and sodium sulfate, and contain organic matter as well as inorganic impurity ions such as calcium, magnesium, and fluorine.

[0003] At present, the main methods for treating hazardous waste salts are incineration and landfill. High-temperature incineration refers to the decomposition of organic impurities in waste salt into gas under high temperature conditions, thereby reducing the organic content in the waste salt to the standard required for industrial salt. However, the waste salt after incineration cannot be significantly reduced simply by incineration. The organic residues and other inorganic impurity ions decomposed at high temperature will affect the quality of the salt and the service life of the equipment. The landfill disposal method has the disadvantages of high cost and occupying a large amount of space. However, there are relatively few industrial solid waste landfills, and hazardous waste salts are difficult to be effectively disposed of by landfill. Therefore, how to treat hazardous waste salts as resources is a professional problem to solve in the environmental protection industry and an inevitable requirement for environmental protection. Utility Model Content

[0004] In view of the deficiencies in the prior art, the utility model provides a hazardous waste salt resource processing system, which is suitable for the processing of salts mainly composed of sodium chloride and sodium sulfate, and solves the problems of difficulty in separating the components in the salts and difficulty in effectively improving the purity of the product salt.

[0005] The utility model solves the above technical problems with the following technical solutions: a hazardous waste salt resource treatment system, including a salt dissolving unit, a pretreatment unit, a flat nanofiltration salt separation unit, a high-pressure DTRO concentration and reduction unit, a sodium chloride evaporation and crystallization unit, an electrocatalytic oxidation hydrogen production unit and a sodium sulfate evaporation and crystallization unit;

[0006] The salt dissolving unit is connected to the pretreatment unit through a conveying pipeline, and the salt dissolving unit is used to dissolve the hazardous waste and miscellaneous salts to be treated to obtain a hazardous waste and miscellaneous salt mixed solution; the pretreatment unit is used to remove impurities, filter and soften the hazardous waste and miscellaneous salt mixed solution conveyed by the salt dissolving unit;

[0007] The pretreatment unit is connected to the flat plate nanofiltration salt separation unit through a conveying pipeline, and the flat plate nanofiltration salt separation unit is used to perform flat plate nanofiltration salt separation on the hazardous waste mixed salt solution pretreated by the pretreatment unit;

[0008] The water outlet of the flat nanofiltration salt separation unit is connected to the high-pressure DTRO concentration and reduction unit through a transmission pipeline, and the high-pressure DTRO concentration and reduction unit is used to concentrate and reduce the water produced by the flat nanofiltration salt separation unit; the high-pressure DTRO concentration and reduction unit is connected to the sodium chloride evaporation and crystallization unit through a transmission pipeline, and the sodium chloride evaporation and crystallization unit is used to evaporate and crystallize the concentrated water received from the high-pressure DTRO concentration and reduction unit to produce sodium chloride;

[0009] The concentrated water outlet of the flat nanofiltration salt separation unit is connected to the electrocatalytic oxidation hydrogen production unit through a delivery pipeline, and the electrocatalytic oxidation hydrogen production unit is used to electrocatalytically oxidize the concentrated water received from the flat nanofiltration salt separation unit to produce hydrogen to remove chemical oxygen demand;

[0010] The liquid outlet of the electrocatalytic oxidation hydrogen production unit is connected to the sodium sulfate evaporation and crystallization unit through a conveying pipeline. The sodium sulfate evaporation and crystallization unit is used to evaporate and crystallize the concentrated water received from the electrocatalytic oxidation hydrogen production unit to remove chemical oxygen demand and produce sodium sulfate.

[0011] As a preferred solution for the hazardous waste and miscellaneous salt resource treatment system, the pretreatment unit includes a multi-stage reaction tank, a filtration tank and a resin softening tank; the multi-stage reaction tank, the filtration tank and the resin softening tank are sequentially connected by a delivery pipeline;

[0012] The multi-stage reaction tank is used to remove the hardness, alkalinity, fluoride ions and suspended matter in the hazardous waste mixed salt solution transported by the salt dissolving unit;

[0013] The filter tank is used to remove turbidity from the hazardous waste mixed salt mixture after the hardness, alkalinity, fluoride ions and suspended matter are removed;

[0014] The resin softening tank is used to de-harden the hazardous waste and miscellaneous salt mixed liquid after turbidity removal.

[0015] As a preferred solution for the hazardous waste and miscellaneous salt resource treatment system, it also includes a sludge pool, and the bottom of the multi-stage reaction tank is connected to the sludge pool through a conveying pipeline; the sludge pool is used to receive the sludge precipitated at the bottom of the multi-stage reaction tank.

[0016] As a preferred solution for the hazardous waste and miscellaneous salt resource treatment system, it also includes a hydrogen energy battery power generation device, which is connected to the hydrogen outlet of the electrocatalytic oxidation hydrogen production unit, and is used to utilize the hydrogen of the electrocatalytic oxidation hydrogen production unit for electrical energy conversion.

[0017] As a preferred solution for the hazardous waste and miscellaneous salt resource treatment system, it also includes a sodium chloride packaging device. The sodium chloride outlet of the sodium chloride evaporation and crystallization unit and the sodium chloride packaging device are connected by a conveying device. The sodium chloride packaging device is used to package the sodium chloride obtained by evaporation and crystallization of the sodium chloride evaporation and crystallization unit.

[0018] As a preferred solution for the hazardous waste and miscellaneous salt resource treatment system, it also includes a sodium sulfate packaging device. The sodium sulfate outlet of the sodium sulfate evaporation and crystallization unit is connected to the sodium sulfate packaging device via a conveying device. The sodium sulfate packaging device is used to package the sodium sulfate obtained by evaporation and crystallization of the sodium sulfate evaporation and crystallization unit.

[0019] The beneficial effects of the utility model are as follows:

[0020] Due to the complex salt content and high organic content of the impure salt, the COD removal rate of the traditional ozone catalytic oxidation solution applied to the impure salt is 20% to 30%. The utility model introduces an electrocatalytic oxidation hydrogen production unit to remove COD, and the overall removal rate can reach more than 80%, thereby improving the whiteness of the crystallized salt.

[0021] Compared with the traditional electrocatalytic oxidation device, the utility model adds an energy conversion device for hydrogen production and hydrogen power generation. The oxidizing substances produced by anode electrolysis can oxidize and remove reducing substances in water, reduce COD in water, and the hydrogen produced by cathode can be converted into electrical energy by fuel cells as a supplementary power source for the project, solving the high energy consumption problem of previous electrocatalytic oxidation to remove COD.

[0022] Flat nanofiltration membrane plays a key role in the separation of high-priced and low-priced salts in the resource utilization of impure salts. Its special structure has strong anti-fouling and clogging capabilities and is easy to clean. The water produced by the membrane system and the evaporation condensate can be used as water to replenish the dissolved salt water, reducing water consumption. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] In order to more clearly illustrate the implementation of the utility model or the technical solution in the prior art, the following is a brief introduction to the drawings required for the implementation or the prior art description. Obviously, the drawings in the following description are only exemplary, and for ordinary technicians in this field, other implementation drawings can be derived from the provided drawings without creative work.

[0024] The structures, proportions, sizes, etc. illustrated in this specification are only used to match the contents disclosed in the specification so as to facilitate understanding and reading by persons familiar with the technology. They are not used to limit the conditions under which the present invention can be implemented, and therefore have no substantial technical significance. Any structural modification, change in proportion or adjustment of size shall still fall within the scope of the technical contents disclosed in the present invention without affecting the effects and purposes that can be achieved by the present invention.

[0025] Figure 1 This is a schematic diagram of a hazardous waste and miscellaneous salt resource processing system provided in an embodiment of the utility model.

[0026] In the figure, 1. salt dissolving unit; 2. pretreatment unit; 3. flat nanofiltration salt separation unit; 4. high-pressure DTRO concentration and reduction unit; 5. sodium chloride evaporation and crystallization unit; 6. electrocatalytic oxidation hydrogen production unit; 7. sodium sulfate evaporation and crystallization unit; 8. multi-stage reaction tank; 9. filtration tank; 10. resin softening tank; 11. sludge tank; 12. hydrogen battery power generation device; 13. sodium chloride packaging equipment; 14. sodium sulfate packaging equipment. DETAILED DESCRIPTION

[0027] In order to make the above-mentioned purposes, features and advantages of the utility model more obvious and easy to understand, the specific implementation methods of the utility model are described in detail below in conjunction with the accompanying drawings. In the following description, many specific details are set forth to facilitate a full understanding of the utility model. However, the utility model can be implemented in many other ways different from those described herein, and those skilled in the art can make similar improvements without violating the connotation of the utility model, so the utility model is not limited by the specific embodiments disclosed below.

[0028] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as those commonly understood by those skilled in the art in the technical field of the present invention. The terms used herein in the specification of the present invention are only for the purpose of describing specific embodiments and are not intended to limit the present invention. The term "and / or" used herein includes any and all combinations of one or more related listed items.

[0029] See also Figure 1 The embodiment of the utility model provides a hazardous waste salt resource treatment system, including a salt dissolving unit 1, a pretreatment unit 2, a flat nanofiltration salt separation unit 3, a high-pressure DTRO concentration and reduction unit 4, a sodium chloride evaporation and crystallization unit 5, an electrocatalytic oxidation hydrogen production unit 6 and a sodium sulfate evaporation and crystallization unit 7;

[0030] The salt dissolving unit 1 is connected to the pretreatment unit 2 through a conveying pipeline, and the salt dissolving unit 1 is used to dissolve the hazardous waste and miscellaneous salts to be treated to obtain a hazardous waste and miscellaneous salt mixed solution; the pretreatment unit 2 is used to remove impurities, filter and soften the hazardous waste and miscellaneous salt mixed solution conveyed by the salt dissolving unit 1;

[0031] The pretreatment unit 2 is connected to the flat plate nanofiltration salt separation unit 3 through a conveying pipeline, and the flat plate nanofiltration salt separation unit 3 is used to perform flat plate nanofiltration salt separation on the hazardous waste mixed salt solution pretreated by the pretreatment unit 2;

[0032] Among them, the water outlet of the flat nanofiltration salt separation unit 3 is connected to the high-pressure DTRO concentration and reduction unit 4 through a transmission pipeline, and the high-pressure DTRO concentration and reduction unit 4 is used to concentrate and reduce the water produced by the received flat nanofiltration salt separation unit 3; the high-pressure DTRO concentration and reduction unit 4 is connected to the sodium chloride evaporation and crystallization unit 5 through a transmission pipeline, and the sodium chloride evaporation and crystallization unit 5 is used to evaporate and crystallize the concentrated water received by the high-pressure DTRO concentration and reduction unit 4 to produce sodium chloride;

[0033] The concentrated water outlet of the flat nanofiltration salt separation unit 3 is connected to the electrocatalytic oxidation hydrogen production unit 6 through a delivery pipeline, and the electrocatalytic oxidation hydrogen production unit 6 is used to electrocatalytically oxidize the concentrated water received from the flat nanofiltration salt separation unit 3 to produce hydrogen to remove chemical oxygen demand;

[0034] The liquid outlet of the electrocatalytic oxidation hydrogen production unit 6 is connected to the sodium sulfate evaporation and crystallization unit 7 via a conveying pipeline. The sodium sulfate evaporation and crystallization unit 7 is used to evaporate and crystallize the concentrated water received from the electrocatalytic oxidation hydrogen production unit 6 to remove chemical oxygen demand and produce sodium sulfate.

[0035] In this embodiment, the salt dissolving unit 1 includes a salt dissolving pool, a mixer, a salt silo, and a quantitative dosing device. The salt is stored in the silo and processed in batches. The salt can be controlled by the quantitative dosing device to control the concentration of the salt. The ratio of the salt to the water consumption is between 1:3.5 and 1:4.5. The salt dissolving water can be recycled water, groundwater or tap water.

[0036] In this embodiment, the pretreatment unit 2 includes a multi-stage reaction tank 8, a filter tank 9 and a resin softening tank 10; the multi-stage reaction tank 8, the filter tank 9 and the resin softening tank 10 are connected in sequence by a delivery pipeline; the multi-stage reaction tank 8 is used to remove the hardness, alkalinity, fluoride ions and suspended matter in the hazardous waste mixed salt solution delivered by the salt dissolving unit 1; the filter tank 9 is used to remove the turbidity of the hazardous waste mixed salt solution after the hardness, alkalinity, fluoride ions and suspended matter particles are removed; the resin softening tank 10 is used to remove the hardness of the hazardous waste mixed salt solution again after the turbidity is removed. In addition, it also includes a sludge tank 11, and the bottom of the multi-stage reaction tank 8 is connected to the sludge tank 11 through a delivery pipeline; the sludge tank 11 is used to receive the sludge precipitated at the bottom of the multi-stage reaction tank 8.

[0037] The total alkalinity of the effluent from the pretreatment unit 2 is controlled below 100 mg / L, the fluoride ion is controlled below 5 mg / L, and the pH is controlled between 6 and 7. The effluent from the multi-stage reaction tank 8 must pass through the filtration tank 9 to ensure that the effluent turbidity is controlled below 1 NTU; the total hardness (calculated as calcium carbonate) of the effluent from the resin softening tank 10 is controlled below 5 mg / L.

[0038] If the brine contains SO4 2- If the content is too high, the Donan effect will occur, Cl - Negative retention occurs, so the resin softening tank 10 is used to retain SO4 2- For high-valent ions such as Na + , K + , Cl - 、NO3 - Monovalent ions have no interception effect, and the monovalent ions in the water are distributed on both sides of the concentrated water and the produced water.

[0039] In this embodiment, the flat nanofiltration salt separation unit 3 includes a flat nanofiltration membrane system, a cleaning system, and a flushing system. The recovery rate of the flat nanofiltration membrane system is controlled at 70% to 85%, and the desalination rate of high-valent ions is 95% to 98%. When the water output of the flat nanofiltration membrane system decreases by more than 10%, the inter-stage pressure difference, the water inlet pressure, and the concentrated water pressure increase by 15%, and the salt permeability increases by more than 5%, the flat nanofiltration membrane system must be chemically cleaned. Adjust the flushing cycle and flushing time according to the operating conditions. After pretreatment, the wastewater enters the flat nanofiltration salt separation unit 3, and high-valent ions, organic substances, etc. are enriched on the concentrated water side, resulting in an increase in the COD and salt content of the concentrated water. The presence of COD will affect the whiteness of the salt produced during the crystallization process, so the electrocatalytic oxidation hydrogen production unit 6 is used to oxidize and reduce the COD in the concentrated brine.

[0040] In this embodiment, the electrocatalytic oxidation hydrogen production unit 6 includes an electrolytic hydrogen production system, a hydrogen purification and separation device, and a hydrogen storage device. The front-end water is concentrated by the flat nanofiltration salt separation unit 3 to a salt concentration of 1% or above, and the total hardness (calculated as calcium carbonate) is maintained below 50 mg / L. In order to avoid the influence of fluoride ions on the electrodes, the inlet water is required to be controlled below 5 mg / L. The cathode electrolyzer of the electrolytic hydrogen production system produces hydrogen, and the hydrogen is mixed with water, carbon dioxide, nitrogen, etc. to enter the hydrogen purification and separation device to obtain pure hydrogen, and the impurity gas can be controlled within 10%. The higher the salt content of the electrolyte, the higher the purity of the hydrogen. Pure hydrogen enters the hydrogen storage device for storage.

[0041] In this embodiment, a hydrogen energy battery power generation device 12 is also included. The hydrogen energy battery power generation device 12 is connected to the hydrogen outlet of the electrocatalytic oxidation hydrogen production unit 6. The hydrogen energy battery power generation device 12 is used to convert the hydrogen of the electrocatalytic oxidation hydrogen production unit 6 into electrical energy.

[0042] Specifically, the hydrogen battery power generation device 12 includes a hydrogen fuel cell and a power supply system. The hydrogen generated by the electrocatalytic oxidation hydrogen production unit 6 is converted into electrical energy through the hydrogen fuel cell, with a conversion rate of 60% to 70%. The electrical energy generated by the battery is converted from direct current to alternating current through an inverter in the power supply system, so that users can obtain electricity on demand.

[0043] In this embodiment, a sodium chloride packaging device 13 is also included, and the sodium chloride outlet of the sodium chloride evaporation and crystallization unit 5 is connected to the sodium chloride packaging device 13 through a conveying device, and the sodium chloride packaging device 13 is used to package the sodium chloride obtained by evaporation and crystallization of the sodium chloride evaporation and crystallization unit 5; and a sodium sulfate packaging device 14 is also included, and the sodium sulfate outlet of the sodium sulfate evaporation and crystallization unit 7 is connected to the sodium sulfate packaging device 14 through a conveying device, and the sodium sulfate packaging device 14 is used to package the sodium sulfate obtained by evaporation and crystallization of the sodium sulfate evaporation and crystallization unit 7.

[0044] Specifically, the concentrated water of the flat nanofiltration salt separation unit 3 is passed through the electrocatalytic oxidation hydrogen production unit 6 to remove COD, and then enters the sodium sulfate evaporation crystallization unit 7 to produce sodium sulfate, and the produced sodium sulfate is packaged and processed by the sodium sulfate packaging equipment 14. The produced water of the flat nanofiltration salt separation unit 3 is concentrated by the high-pressure DTRO concentration and reduction unit 4, and the concentrated water of the high-pressure DTRO concentration and reduction unit 4 enters the sodium chloride evaporation crystallization unit 5 to produce sodium chloride, and the produced sodium chloride is packaged and processed by the sodium chloride packaging equipment 13. Among them, the produced water and evaporated condensed water of the membrane system can be used as water replenishment for the dissolved brine of the impurities.

[0045] In summary, the utility model uses mixed salts to store in silos and process in batches. Mixed salts can be used to control the concentration of dissolved salts through a quantitative dosing device. The ratio of mixed salts to water consumption is between 1:3.5 and 1:4.5. The dissolved salt water can be recycled water, groundwater or tap water. The total alkalinity of the effluent from the pretreatment unit 2 is controlled below 100 mg / L, the fluoride ion is controlled below 5 mg / L, and the pH is controlled between 6 and 7. The effluent turbidity of the multi-stage reaction tank 8 must be controlled below 1 NTU after passing through the filter tank 9; the total hardness (calcium carbonate) of the effluent from the resin softening tank 10 is controlled below 5 mg / L. The flat nanofiltration salt separation unit 3 includes a flat nanofiltration membrane system, a cleaning system, and a flushing system. The recovery rate of the flat nanofiltration membrane system is controlled at 70% to 85%, and the desalination rate of high-valent ions is 95% to 98%. When the water output of the flat nanofiltration membrane system decreases by more than 10%, the pressure difference between sections, the inlet pressure, and the concentrated water pressure increase by 15%, and the salt permeability increases by more than 5%, the flat nanofiltration membrane system needs to be chemically cleaned. Adjust the flushing cycle and flushing time according to the operating conditions. After pretreatment, the wastewater enters the flat nanofiltration salt separation unit 3. High-valent ions, organic matter, etc. are enriched on the concentrated water side, resulting in increased COD and salt in the concentrated water. The presence of COD will affect the whiteness of the salt produced during the crystallization process, so the electrocatalytic oxidation hydrogen production unit 6 is used to oxidize and reduce the COD in the concentrated brine. The electrocatalytic oxidation hydrogen production unit 6 includes an electrolytic hydrogen production system, a hydrogen purification and separation device, and a hydrogen storage device. The front-end incoming water must be concentrated to a salt concentration of 1% or more after passing through the flat nanofiltration salt separation unit 3, and the total hardness (calculated as calcium carbonate) must be kept below 50 mg / L. In order to avoid the influence of fluoride ions on the electrodes, the inlet water is required to be controlled below 5 mg / L. The cathode electrolyzer of the electrolytic hydrogen production system produces hydrogen, which is mixed with water, carbon dioxide, nitrogen, etc. and enters the hydrogen purification and separation device to obtain pure hydrogen, and the impurity gas can be controlled within 10%. The higher the salt content of the electrolyte, the higher the purity of the hydrogen. Pure hydrogen enters the hydrogen storage device for storage. After the concentrated water of the flat nanofiltration salt separation unit 3 passes through the electrocatalytic oxidation hydrogen production unit 6 to remove COD, it enters the sodium sulfate evaporation crystallization unit 7 to produce sodium sulfate, and the produced sodium sulfate is packaged and processed using the sodium sulfate packaging equipment 14. After the water produced by the flat nanofiltration salt separation unit 3 is concentrated by the high-pressure DTRO concentration and reduction unit 4, the concentrated water of the high-pressure DTRO concentration and reduction unit 4 enters the sodium chloride evaporation crystallization unit 5 to produce sodium chloride, and the produced sodium chloride is packaged and processed using the sodium chloride packaging equipment 13. Among them, the water produced by the membrane system and the evaporated condensed water can be used as the brine replenishment of the impurity salt.Due to the complex salt content and high organic content of the mixed salt, the COD removal rate of the traditional ozone catalytic oxidation scheme applied to the mixed salt is 20% to 30%. The utility model introduces an electrocatalytic oxidation hydrogen production unit 6 to remove COD, and the overall removal rate can reach more than 80%, thereby improving the whiteness of the crystalline salt. Compared with the traditional electrocatalytic oxidation device, the utility model adds an energy conversion device for hydrogen production and hydrogen power generation. The oxidizing substances produced by anode electrolysis can oxidize and remove reducing substances in the water, thereby reducing the COD in the water. The hydrogen produced by the cathode can be converted into electricity through a fuel cell as a supplementary power source for the project, thereby solving the high energy consumption problem of electrocatalytic oxidation to remove COD in the past. The flat nanofiltration membrane plays a key role in separating high-priced and low-priced salts in the recycling of mixed salts, and its special structure has strong anti-fouling and clogging capabilities and is easy to clean. The water produced by the membrane system and the evaporated condensed water can be used as water replenishment for the dissolved salt water, thereby reducing the water consumption.

[0046] The technical features of the above-described embodiments may be arbitrarily combined. To make the description concise, not all possible combinations of the technical features in the above-described embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0047] The above-mentioned embodiments only express several implementation methods of the utility model, and the description is relatively specific and detailed, but it cannot be understood as limiting the scope of the utility model patent. It should be pointed out that for ordinary technicians in this field, several modifications and improvements can be made without departing from the concept of the utility model, which all belong to the protection scope of the utility model. Therefore, the protection scope of the utility model patent shall be based on the attached claims.

Claims

1. A hazardous waste salt resource treatment system, characterized in that: It comprises a salt dissolving unit (1), a pretreatment unit (2), a flat nanofiltration salt separation unit (3), a high-pressure DTRO concentration and reduction unit (4), a sodium chloride evaporation and crystallization unit (5), an electrocatalytic oxidation hydrogen production unit (6) and a sodium sulfate evaporation and crystallization unit (7); The salt dissolving unit (1) is connected to the pretreatment unit (2) via a delivery pipeline, and the salt dissolving unit (1) is used to dissolve the hazardous waste and miscellaneous salts to be treated to obtain a hazardous waste and miscellaneous salt mixed liquid; the pretreatment unit (2) is used to remove impurities, filter and soften the hazardous waste and miscellaneous salt mixed liquid delivered by the salt dissolving unit (1); The pretreatment unit (2) is connected to the flat plate nanofiltration salt separation unit (3) via a conveying pipeline, and the flat plate nanofiltration salt separation unit (3) is used to perform flat plate nanofiltration salt separation on the hazardous waste mixed salt solution pretreated by the pretreatment unit (2); The water outlet of the flat nanofiltration salt separation unit (3) is connected to the high-pressure DTRO concentration and reduction unit (4) via a transmission pipeline, and the high-pressure DTRO concentration and reduction unit (4) is used to concentrate and reduce the water produced by the flat nanofiltration salt separation unit (3); the high-pressure DTRO concentration and reduction unit (4) is connected to the sodium chloride evaporation and crystallization unit (5) via a transmission pipeline, and the sodium chloride evaporation and crystallization unit (5) is used to evaporate and crystallize the concentrated water received by the high-pressure DTRO concentration and reduction unit (4) to produce sodium chloride; The concentrated water outlet of the flat nanofiltration salt separation unit (3) is connected to the electrocatalytic oxidation hydrogen production unit (6) via a transmission pipeline, and the electrocatalytic oxidation hydrogen production unit (6) is used to electrocatalytically oxidize the concentrated water received from the flat nanofiltration salt separation unit (3) to produce hydrogen to remove chemical oxygen demand; The liquid outlet of the electrocatalytic oxidation hydrogen production unit (6) is connected to the sodium sulfate evaporation and crystallization unit (7) via a conveying pipeline, and the sodium sulfate evaporation and crystallization unit (7) is used to evaporate and crystallize the concentrated water received from the electrocatalytic oxidation hydrogen production unit (6) from which chemical oxygen demand is removed to produce sodium sulfate.

2. A hazardous waste and miscellaneous salt resource treatment system according to claim 1, characterized in that: The pretreatment unit (2) comprises a multi-stage reaction tank (8), a filtration tank (9) and a resin softening tank (10); the multi-stage reaction tank (8), the filtration tank (9) and the resin softening tank (10) are connected in sequence by a transport pipeline; The multi-stage reaction tank (8) is used to remove the hardness, alkalinity, fluoride ions and suspended matter in the hazardous waste mixed salt solution transported by the salt dissolving unit (1); The filter tank (9) is used to remove turbidity from the hazardous waste and salt mixed liquid after the hardness, alkalinity, fluoride ions and suspended particles are removed; The resin softening tank (10) is used to de-harden the hazardous waste and miscellaneous salt mixed liquid after turbidity removal.

3. A hazardous waste and miscellaneous salt resource treatment system according to claim 2, characterized in that: It also comprises a sludge pool (11), the bottom of the multi-stage reaction pool (8) being connected to the sludge pool (11) via a conveying pipeline; the sludge pool (11) is used to receive the sludge precipitated at the bottom of the multi-stage reaction pool (8).

4. A hazardous waste and miscellaneous salt resource treatment system according to claim 1, characterized in that: It also comprises a hydrogen energy battery power generation device (12), the hydrogen energy battery power generation device (12) being connected to the hydrogen outlet of the electrocatalytic oxidation hydrogen production unit (6), and the hydrogen energy battery power generation device (12) being used to utilize the hydrogen of the electrocatalytic oxidation hydrogen production unit (6) to perform electrical energy conversion.

5. A hazardous waste and miscellaneous salt resource treatment system according to claim 1, characterized in that: It also comprises a sodium chloride packaging device (13), wherein the sodium chloride outlet of the sodium chloride evaporation and crystallization unit (5) and the sodium chloride packaging device (13) are connected via a conveying device, and the sodium chloride packaging device (13) is used to package the sodium chloride obtained by evaporation and crystallization of the sodium chloride evaporation and crystallization unit (5).

6. A hazardous waste and miscellaneous salt resource treatment system according to claim 1, characterized in that: It also comprises a sodium sulfate packing device (14), wherein the sodium sulfate outlet of the sodium sulfate evaporation and crystallization unit (7) and the sodium sulfate packing device (14) are connected via a conveying device, and the sodium sulfate packing device (14) is used to pack the sodium sulfate obtained by evaporation and crystallization of the sodium sulfate evaporation and crystallization unit (7).

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