Treatment system for organic phosphorus-containing waste liquid

Abstract

The utility model provides a treatment system for organic phosphorus-containing waste liquid. The system comprises a compatibility tank provided with a potassium hydroxide solution inlet and an organic phosphorus-containing waste liquid inlet, an oxidation reactor provided with an oxidant inlet, a potassium phosphate conversion device connected with the oxidation reactor, and a potassium hydroxide solution storage tank and a monopotassium phosphate solution storage tank which are respectively connected with the potassium phosphate conversion device, the potassium phosphate conversion device comprises an electrified positive electrode and an electrified negative electrode which are oppositely arranged, and further comprises a plurality of cation exchange membranes and a plurality of bipolar ion membranes which are alternately arranged between the electrified positive electrode and the electrified negative electrode. According to the invention, the oxidation reaction is carried out in the oxidation reactor under the supercritical condition, so that the efficient decomposition of organic pollutants is realized, and meanwhile, the potassium phosphate conversion device is used for carrying out ion exchange to generate monopotassium phosphate, so that the efficient recovery of phosphorus element is realized, and the wastewater discharge reaches the standard.

Description

Technical Field

[0001] The present application relates to the field of environmental protection technology, and in particular to a treatment system for waste liquid containing organophosphorus. Background Art

[0002] In the prior art, wastewater discharged from industries such as pesticides, petrochemicals, coking, pharmaceuticals, fermentation, food, papermaking, rubber, dyes, and textile printing and dyeing often contains organophosphorus compounds, which can easily cause environmental pollution, eutrophication of surface water bodies, and deterioration of water quality. Organophosphorus pollution is a growing concern. Furthermore, phosphorus is an essential element for human survival and daily life. It is primarily derived from natural phosphate rock and is a non-renewable resource with limited reserves. Discharging untreated wastewater containing organophosphorus is a waste of resources.

[0003] Generally speaking, conventional technologies for the disposal of wastewater containing organic phosphorus include biological methods, physicochemical methods, wet oxidation, incineration, etc. These treatment methods often have limited applicability, incomplete disposal, secondary pollution, difficult and complicated phosphorus recovery or no recovery, high energy consumption and other problems. Among them, biological methods and physicochemical methods are only suitable for low-concentration wastewater containing organic phosphorus. Phosphorus is converted into biochemical or physicochemical sludge, which is solid waste, and phosphorus is not actually recovered. Wet oxidation is suitable for wastewater containing organic phosphorus at higher concentrations, but the degradation of organic matter is not complete, secondary treatment is required, and phosphorus recovery is difficult and complicated. Incineration disposal of wastewater containing organic phosphorus requires the addition of a large amount of auxiliary fuel, which has high energy consumption. Phosphorus will generate acidic substances and corrode equipment. The phosphorus is eventually converted into solid waste. In addition, the exhaust gas emissions are large, and there is secondary pollution of phosphorus-containing particles. Although the exhaust gas can meet the emission standards after treatment, it still contains a variety of atmospheric pollutants and a large amount of carbon dioxide greenhouse gas. Utility Model Content

[0004] The present application aims to propose a system for treating organic phosphorus waste liquid, which can achieve efficient and clean treatment of organic phosphorus waste liquid, and at the same time achieve efficient recovery of phosphorus to obtain products with high economic value.

[0005] To achieve the above-mentioned objectives, the present application discloses a system for treating waste liquid containing organophosphorus, the system comprising a mixing tank provided with an inlet for a potassium hydroxide solution and an inlet for the waste liquid containing organophosphorus, an oxidation reactor provided with an inlet for an oxidant, a potassium phosphate conversion device connected to the oxidation reactor, and a potassium hydroxide solution storage tank and a potassium dihydrogen phosphate solution storage tank respectively connected to the potassium phosphate conversion device;

[0006] The potassium phosphate conversion device includes a powered positive electrode and a powered negative electrode that are arranged opposite to each other, and also includes a plurality of cation exchange membranes and a plurality of bipolar ion membranes that are alternately arranged between the powered positive electrode and the powered negative electrode.

[0007] Optionally, the system further includes a potassium dihydrogen phosphate solution delivery pump connected to the potassium dihydrogen phosphate solution storage tank, a potassium dihydrogen phosphate solution evaporator connected to the potassium dihydrogen phosphate solution delivery pump, and a potassium dihydrogen phosphate separator connected to the potassium dihydrogen phosphate solution evaporator.

[0008] Optionally, the system further comprises a concentrating device, which is respectively connected to the oxidation reactor and the potassium phosphate conversion device.

[0009] Optionally, the system further comprises a high-pressure waste liquid delivery pump connected to the compatibility tank, and a preheater connected to the high-pressure waste liquid delivery pump; the preheater is also connected to the oxidation reactor.

[0010] Optionally, the potassium hydroxide solution storage tank is also connected to the compatibility tank.

[0011] Optionally, the system further comprises a high-pressure oxidant delivery pump connected to the oxidation reactor.

[0012] Optionally, the system further comprises a gas-liquid separation device respectively connected to the oxidation reactor and the potassium phosphate conversion device.

[0013] Optionally, the gas-liquid separation device includes a primary gas-liquid separation device and a secondary gas-liquid separation device connected to the primary gas-liquid separation device.

[0014] Optionally, the system further includes a generator set connected to the secondary gas-liquid separation device.

[0015] Optionally, the system further comprises a carbon dioxide recovery system connected to the primary gas-liquid separation device.

[0016] Compared with the prior art, this application has the following advantages:

[0017] The present invention provides a system for treating organic phosphorus-containing waste liquid, comprising a mixing tank equipped with an inlet for a potassium hydroxide solution and an inlet for the organic phosphorus-containing waste liquid, an oxidation reactor equipped with an inlet for an oxidant, a potassium phosphate conversion device connected to the oxidation reactor, and storage tanks for the potassium hydroxide solution and potassium dihydrogen phosphate solution, respectively connected to the potassium phosphate conversion device. The potassium phosphate conversion device comprises an electrically powered positive electrode and an electrically powered negative electrode disposed opposite each other, as well as a plurality of cation exchange membranes and a plurality of bipolar ion membranes alternately disposed between the electrically powered positive electrode and the electrically powered negative electrode. The present invention achieves efficient decomposition of organic pollutants through the oxidation reactor, while simultaneously performing ion exchange in the potassium phosphate conversion device to generate potassium dihydrogen phosphate, enabling efficient recovery of phosphorus and ensuring that wastewater discharge meets standards. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 Schematic diagram of a treatment system for organophosphorus waste liquid shown in an embodiment of the present application;

[0019] Figure 2 This is a schematic diagram of a potassium phosphate conversion device shown in an embodiment of the present application.

[0020] Among them, L1-organic phosphorus waste liquid, L2-potassium hydroxide solution, L3-condensed water, G1-oxidant, G2-carbon dioxide product, S-potassium dihydrogen phosphate, E-electricity.

[0021] 1- compatibility tank, 2- high-pressure waste liquid transfer pump, 3- preheater, 4- oxidation reactor, 5- decompression system, 6- primary gas-liquid separation device, 7- secondary gas-liquid separation device, 8- generator set, 9- cooler, 10- concentration device, 11- potassium phosphate conversion device, 12- potassium hydroxide solution storage tank, 13- potassium hydroxide solution transfer pump, 14- potassium dihydrogen phosphate solution storage tank, 15- potassium dihydrogen phosphate solution transfer pump, 16- potassium dihydrogen phosphate solution evaporator, 17- potassium dihydrogen phosphate separator, 18- potassium dihydrogen phosphate dryer, 19- steam condenser, 20- cooling device, 21- carbon dioxide recovery system, 22- energy storage device, 23- high-pressure oxidant transfer pump;

[0022] 11-1-energized negative electrode, 11-2-energized positive electrode, +-cation exchange membrane, ±-bipolar ion membrane, a-potassium phosphate solution, b-potassium hydroxide solution, c-potassium dihydrogen phosphate solution, d-electrode solution. DETAILED DESCRIPTION

[0023] In order to make the above-mentioned purposes, features and advantages of the present application more obvious and easy to understand, the present application is further described in detail below with reference to the accompanying drawings and specific implementation methods.

[0024] refer to Figure 1 , Figure 1 This is a schematic diagram of a system for treating organophosphorus-containing wastewater, as described in an embodiment of the present application. The system includes a mixing tank 1 equipped with inlets for a potassium hydroxide solution and the organophosphorus-containing wastewater, an oxidation reactor 4 equipped with an oxidant inlet, a potassium phosphate conversion unit 11 connected to the oxidation reactor 4, and a potassium hydroxide solution storage tank 12 and a potassium dihydrogen phosphate solution storage tank 14, each connected to the potassium phosphate conversion unit 11.

[0025] refer to Figure 2 , Figure 2This is a schematic diagram of a potassium phosphate conversion device according to an embodiment of the present application. The potassium phosphate conversion device 11 includes an electrically powered positive electrode 11-2 and an electrically powered negative electrode 11-1 disposed opposite each other, as well as a plurality of cation exchange membranes + and a plurality of bipolar ion exchange membranes ± alternately disposed between the electrically powered positive electrode 11-2 and the electrically powered negative electrode 11-1.

[0026] The mixing tank 1 is used to receive potassium hydroxide solution through the potassium hydroxide solution inlet and receive organic phosphorus waste liquid through the organic phosphorus waste liquid inlet, determine the ratio between potassium hydroxide solution L2 and organic phosphorus waste liquid L1 according to the phosphorus content in the organic phosphorus waste liquid L1, mix the organic phosphorus waste liquid L1 and potassium hydroxide solution L2 according to the ratio, and pass the mixed solution into the oxidation reactor 4.

[0027] Specifically, in order to allow the potassium hydroxide solution L2 to fully react with the organic phosphorus-containing waste liquid L1, the ratio between the potassium hydroxide solution L2 and the organic phosphorus-containing waste liquid L1 can be determined according to the phosphorus content in the organic phosphorus-containing waste liquid L1.

[0028] Specifically, the ratio between the organic phosphorus waste liquid L1 and the potassium hydroxide solution L2 can be calculated as follows:

[0029] Q P / Q KOH =31*C KOH / (3*56*C P )

[0030] Among them, Q P -Flow rate of waste liquid containing organic phosphorus L1, m 3 / h;Q P - Potassium hydroxide solution L2 flow rate, m 3 / h; C P -Phosphorus concentration of organic phosphorus waste liquid L1, g / L; C KOH -Potassium hydroxide concentration, g / L.

[0031] The oxidation reactor 4 is used to carry out an oxidation reaction between a mixed solution containing the organic phosphorus waste liquid L1 and the potassium hydroxide solution L2 and the oxidant G1 under supercritical conditions to obtain a potassium phosphate solution, and the potassium phosphate solution is passed into the potassium phosphate conversion device 11;

[0032] The potassium phosphate conversion device 11 is used to energize the positive electrode 11-2 and the negative electrode 11-1, forming a solution channel between the cation exchange membrane and the bipolar ion membrane ±. The solution channel can be divided into a solution channel for inputting potassium phosphate solution a and a solution channel for inputting potassium hydroxide solution b. The solution channel for inputting potassium phosphate solution a and the solution channel for inputting potassium hydroxide solution b are arranged alternately. Under the action of the electrodes, the ions in the solution undergo electromigration. The K in potassium phosphate solution a +Under the attraction of the negative electrode, it moves toward the negative electrode, and the cation exchange membrane ﹢ only allows cations to pass through, K + Through the cation exchange membrane, it enters the potassium hydroxide solution channel. The bipolar ion membrane electrolyzes water into H + OH - , the generated OH - Attracted by the positive electrode, it moves toward the positive electrode and enters the potassium hydroxide solution channel, interacting with the K + , generating potassium hydroxide solution b. The H produced by the bipolar ion membrane + Attracted by the negative electrode, the electrolyte migrates toward the negative electrode, enters the potassium phosphate solution channel, and reacts with potassium phosphate solution a to form potassium dihydrogen phosphate solution c. The potassium phosphate conversion device also includes an electrode solution d that acts as a conductor. In a specific implementation, potassium hydroxide solution b can be added to the potassium phosphate conversion device 11 to enhance the electromigration effect, as needed.

[0033] Specifically, in order to improve the degradation efficiency of organic pollutants, an oxidation reactor 4 is provided in the embodiment of the present application to provide a supercritical environment. An oxidant G1 and a mixed solution containing organic phosphorus waste liquid L1 and potassium hydroxide solution L2 are introduced into the oxidation reactor 4, and oxidative degradation is carried out in a supercritical environment. The carbon element in the organic phosphorus is converted into CO2, the hydrogen element is converted into H2O, and the phosphorus element is formed into H3PO4.

[0034] The oxidant G1 may be oxygen, ozone, hydrogen peroxide, etc., and this application does not impose any limitation on this.

[0035] In order to prevent phosphoric acid from corroding the equipment, potassium hydroxide solution L2 can be introduced simultaneously with the introduction of organic phosphorus waste liquid L1. Potassium hydroxide can neutralize phosphoric acid to form potassium phosphate solution.

[0036] As an example of the present application, when the oxidant G1 is oxygen, the supercritical water oxidative decomposition reaction can be expressed as:

[0037] C x H y O z P n +O2+KOH→CO2↑+H2O+K3PO4

[0038] Therefore, in order to obtain phosphorus-containing products with higher economic value, the potassium phosphate solution can be further introduced into the potassium phosphate conversion device 11 for treatment.

[0039] refer to Figure 2 , Figure 2Schematic diagram of a potassium phosphate conversion device 11 shown in an embodiment of the present application. The potassium phosphate conversion device 11 includes an electrically powered positive electrode 11-2 and an electrically powered negative electrode 11-1 disposed opposite each other, and also includes a plurality of cation exchange membranes + and a plurality of bipolar ion membranes ± alternately disposed between the electrically powered positive electrode 11-2 and the electrically powered negative electrode 11-1.

[0040] Under the action of electrodes, ions in the solution undergo electromigration. + Under the attraction of the negative electrode, it moves toward the negative electrode, and the cation exchange membrane ﹢ only allows cations to pass through, K + The bipolar ion membrane dissociates water into H + OH - , the generated OH - Attracted by the positive electrode, it moves toward the positive electrode and enters the potassium hydroxide solution channel, interacting with the K + , generating potassium hydroxide solution b. The H produced by the bipolar ion membrane + Under the attraction of the negative electrode, it moves toward the negative electrode, enters the potassium phosphate solution channel, and generates potassium dihydrogen phosphate solution c with potassium phosphate solution a. Among them, the potassium phosphate conversion device also includes an electrode liquid d that plays a conductive role.

[0041] This allows for the recovery of phosphorus from the organophosphorus waste liquid L1, resulting in a potassium dihydrogen phosphate product with high economic value. Other products produced during the treatment process, such as potassium hydroxide, can also be further recycled. The overall treatment process utilizes environmentally friendly raw materials and produces products without generating additional pollution, thereby enhancing the environmental friendliness of organophosphorus waste liquid treatment.

[0042] In one embodiment of the present application, the system further includes a potassium dihydrogen phosphate solution delivery pump 15 connected to the potassium dihydrogen phosphate solution storage tank 14, a potassium dihydrogen phosphate solution evaporator 16 connected to the potassium dihydrogen phosphate solution delivery pump 15, and a potassium dihydrogen phosphate separator 17 connected to the potassium dihydrogen phosphate solution evaporator 16.

[0043] Specifically, after potassium dihydrogen phosphate is obtained by the potassium phosphate conversion device 11, the potassium dihydrogen phosphate can be stored in a potassium dihydrogen phosphate solution storage tank 14. Thereafter, the potassium dihydrogen phosphate solution can be further refined. The potassium dihydrogen phosphate solution can be delivered to a potassium dihydrogen phosphate solution evaporator 16 via a potassium dihydrogen phosphate solution delivery pump 15. In the potassium dihydrogen phosphate solution evaporator 16, the potassium dihydrogen phosphate solution can be evaporated and crystallized to initially form a solid potassium dihydrogen phosphate salt.

[0044] Thereafter, the mixed solution containing potassium dihydrogen phosphate salt in potassium dihydrogen phosphate solution evaporator 16 is passed into potassium dihydrogen phosphate separator 17, where it is separated by filtration to obtain potassium dihydrogen phosphate salt. The potassium dihydrogen phosphate salt is further placed in potassium dihydrogen phosphate dryer 18 for drying to obtain potassium dihydrogen phosphate salt product S.

[0045] The water vapor evaporated from the potassium dihydrogen phosphate solution evaporator 16 can be cooled by the steam condenser 19 to obtain condensed water L3, which can be recycled later.

[0046] The potassium dihydrogen phosphate solution evaporator 16 may adopt a multi-effect evaporation or MVR (Mechanical Vapor Recompression) form.

[0047] In one embodiment of the present application, the system further includes a concentrating device, which is respectively connected to the oxidation reactor and the potassium phosphate conversion device.

[0048] The oxidation reactor 4 is specifically used to pass the potassium phosphate solution into the concentration device 10;

[0049] The concentrating device 10 is used to concentrate the potassium phosphate solution and then pass the concentrated potassium phosphate solution into the potassium phosphate conversion device 11.

[0050] Specifically, before the potassium phosphate solution is passed into the potassium phosphate conversion device 11, it can be further cooled in the cooler 9 and then passed into the concentrator 10 for concentration treatment to improve the efficiency of the subsequent ion exchange process. The fresh water obtained after the concentration treatment can be used as cooling water for the oxidation reactor 4 for recycling.

[0051] In one embodiment of the present application, the system further includes a mixing tank 1, a high-pressure waste liquid delivery pump 2 connected to the mixing tank 1, and a preheater 3 connected to the high-pressure waste liquid delivery pump 2; the preheater 3 is also connected to the oxidation reactor 4.

[0052] The high-pressure waste liquid delivery pump 2 is used to deliver the mixed organic phosphorus-containing waste liquid L1 and potassium hydroxide solution L2 to the preheater 3;

[0053] The preheater 3 is used to heat the mixed organic phosphorus-containing waste liquid L1 and potassium hydroxide solution L2 to a preset temperature and then transport them to the oxidation reactor 4.

[0054] Specifically, if a supercritical water environment is required in the oxidation reactor 4, a high temperature requirement is imposed on the oxidation reactor 4. Generally speaking, when the water temperature reaches 374°C or above, the solution system in the oxidation reactor 4 can be transformed into a supercritical state.

[0055] In order to facilitate the formation of a supercritical water environment, the mixed organic phosphorus waste liquid L1 and potassium hydroxide solution L2 can be heated by a preheater 3. The preheater 3 can heat the mixed organic phosphorus waste liquid L1 and potassium hydroxide solution L2 to 200-300°C, and then pass the mixed organic phosphorus waste liquid L1 and potassium hydroxide solution L2 into the oxidation reactor 4.

[0056] In one embodiment of the present application, the potassium hydroxide solution storage tank 12 is also connected to the mixing tank 1.

[0057] In a specific implementation, the potassium hydroxide solution storage tank 12 can also be connected to the compatibility tank 1, so that the potassium hydroxide in the potassium hydroxide solution storage tank 12 can be recycled into the compatibility tank for recycling, thereby realizing recycling within the system and minimizing the waste generated during the treatment of the organophosphorus solution.

[0058] In one embodiment of the present application, the system further includes a high-pressure oxidant delivery pump 23 connected to the oxidation reactor 4 .

[0059] The high-pressure oxidant delivery pump 23 is used to pass the oxidant G1 into the oxidation reactor 4;

[0060] The oxidation reactor 4 is specifically used to carry out an oxidation reaction of the organic phosphorus waste liquid L1 and the potassium hydroxide solution L2. The reaction is an exothermic reaction. The temperature in the oxidation reactor 4 rises and can quickly reach a supercritical state. The organic phosphorus waste liquid L1, the potassium hydroxide solution L2, and the oxidant G1 undergo an oxidative decomposition reaction to obtain a potassium phosphate solution.

[0061] Specifically, in order to carry out the oxidative decomposition reaction in a supercritical water environment, a high-pressure oxidant delivery pump 23 can be used to pass the oxidant G1 into the oxidation reactor 4. As a specific example of the present invention, the oxidant G1 can be liquid oxygen.

[0062] In oxidation reactor 4, the organophosphorus waste liquid L1 and potassium hydroxide solution L2 react with oxidant G1 to produce an exothermic oxidation reaction. The temperature in oxidation reactor 4 rises to above 374°C, creating a supercritical environment. In this environment, the organophosphorus waste liquid L1, potassium hydroxide solution L2, and oxidant G1 undergo an oxidative decomposition reaction at a temperature of 550-650°C and a pressure of 22.1-24 MPa, producing a potassium phosphate solution.

[0063] In one embodiment of the present application, the system further includes a gas-liquid separation device connected to the oxidation reactor 4 and the potassium phosphate conversion device 11 respectively.

[0064] Specifically, due to the supercritical high temperature and high pressure state, the multiphase is converted into a homogeneous phase, and gases such as oxygen and carbon dioxide are dissolved in supercritical water. Therefore, the oxidation product output by the oxidation reactor 4 also contains carbon dioxide and oxidant G1. Therefore, before the potassium phosphate conversion, the carbon dioxide and oxidant G1 in the oxidation product can also be separated by a gas-liquid separation device.

[0065] In one embodiment of the present application, the gas-liquid separation device includes a primary gas-liquid separation device and a secondary gas-liquid separation device connected to the primary gas-liquid separation device.

[0066] The primary gas-liquid separation device 6 separates the carbon dioxide and the oxidant G1 from the oxidation product by flash evaporation and decompression, and passes the potassium phosphate solution after the primary gas-liquid separation treatment into the secondary gas-liquid separation device 7;

[0067] The secondary gas-liquid separation device 7 is used to separate water vapor in the potassium phosphate solution by flash evaporation and pressure reduction, and pass the potassium phosphate solution after the secondary gas-liquid separation treatment into the potassium phosphate conversion device 11.

[0068] Specifically, the oxidation product output from the oxidation reactor 4 is reduced in pressure to 4-6 MPa by a pressure reduction system 5 before entering a primary gas-liquid separation unit 6 for flash evaporation and pressure reduction, thereby separating the gas phase from the liquid phase. The gas phase produced by the primary gas-liquid separation primarily contains water vapor, CO₂, and O₂, and has a pressure of 2-4 MPa.

[0069] Afterwards, the liquid phase after the primary gas-liquid separation can be subjected to a secondary gas-liquid separation device 7. At this point, the gas phase contains almost no CO2 and O2, so that the secondary gas-liquid separation can mainly separate water vapor. After the secondary gas-liquid separation, the potassium phosphate solution with higher purity can be passed into the potassium phosphate conversion device 11 for further processing.

[0070] In one embodiment of the present application, the system further comprises a generator set 8 connected to the secondary gas-liquid separation device 7;

[0071] The generator set 8 is used to receive the water vapor discharged by the secondary gas-liquid separation device 7 and generate electricity through the water vapor.

[0072] In a specific implementation, the generator set 8 can receive the water vapor discharged from the secondary gas-liquid separation device 7 and generate electricity through the water vapor, generating electrical energy E and storing it in the energy storage device 22. After power generation, the exhaust steam output by the generator set 8 can enter the steam condenser 19 for cooling and further use.

[0073] In one embodiment of the present application, the system further includes a carbon dioxide recovery system 21 connected to the primary gas-liquid separation device 6 .

[0074] The carbon dioxide recovery system 21 is used to receive the carbon dioxide and the oxidant G1 discharged from the primary gas-liquid separation device 6 and separate the carbon dioxide and the oxidant G1 through pressure swing adsorption or distillation.

[0075] Specifically, the carbon dioxide and oxidant G1 discharged from the primary gas-liquid separation device 6 can be passed through a cooling device 20 to reduce the temperature and remove water vapor in the gas phase. Thereafter, the carbon dioxide and oxidant G1 can be passed into a carbon dioxide recovery system 21 to extract the carbon dioxide product G2.

[0076] The carbon dioxide G2 can be extracted by pressure swing adsorption or distillation to separate the carbon dioxide and the oxidant G1.

[0077] When using pressure swing adsorption, the adsorbent material selectively adsorbs carbon dioxide at gaseous pressure. The oxidant G1 and other impurities are not adsorbed and are discharged directly. Subsequently, the atmospheric pressure is reduced, and the carbon dioxide adsorbed by the adsorbent material is desorbed, resulting in highly pure carbon oxide G2 for recycling.

[0078] When distillation is used, the gas phase can be dried and dehydrated first, then cooled to -5 to -10°C to liquefy the gas phase and then enter the distillation unit. The unliquefied impurity gas is separated from the liquid carbon dioxide to obtain higher purity carbon dioxide for recycling.

[0079] The above is a detailed introduction to a treatment system for organophosphorus waste liquid provided by the present application. Specific examples are used herein to illustrate the principles and implementation methods of the present application. The description of the above embodiments is only used to help understand the method of the present application and its core idea. At the same time, for those skilled in the art, based on the ideas of the present application, there will be changes in the specific implementation methods and application scope. In summary, the content of this specification should not be understood as a limitation on the present application.

Claims

1. A system for treating waste liquid containing organophosphorus, characterized in that: The system includes a mixing tank provided with an inlet for potassium hydroxide solution and an inlet for organic phosphorus waste liquid, an oxidation reactor provided with an inlet for an oxidant, a potassium phosphate conversion device connected to the oxidation reactor, and a potassium hydroxide solution storage tank and a potassium dihydrogen phosphate solution storage tank respectively connected to the potassium phosphate conversion device; The potassium phosphate conversion device includes a powered positive electrode and a powered negative electrode that are arranged opposite to each other, and also includes a plurality of cation exchange membranes and a plurality of bipolar ion membranes that are alternately arranged between the powered positive electrode and the powered negative electrode.

2. The system for treating waste liquid containing organic phosphorus according to claim 1, characterized in that: The system further includes a potassium dihydrogen phosphate solution delivery pump connected to the potassium dihydrogen phosphate solution storage tank, a potassium dihydrogen phosphate solution evaporator connected to the potassium dihydrogen phosphate solution delivery pump, and a potassium dihydrogen phosphate separator connected to the potassium dihydrogen phosphate solution evaporator.

3. The system for treating waste liquid containing organic phosphorus according to claim 1, characterized in that: The system further comprises a concentrating device, which is respectively connected to the oxidation reactor and the potassium phosphate conversion device.

4. The system for treating waste liquid containing organic phosphorus according to claim 1, characterized in that: The system further comprises a high-pressure waste liquid delivery pump connected to the mixing tank, and a preheater connected to the high-pressure waste liquid delivery pump; the preheater is also connected to the oxidation reactor.

5. The system for treating waste liquid containing organic phosphorus according to claim 4, characterized in that: The potassium hydroxide solution storage tank is also connected to the compatibility tank.

6. The system for treating waste liquid containing organic phosphorus according to claim 1, characterized in that: The system further comprises a high-pressure oxidant delivery pump connected to the oxidation reactor.

7. The system for treating waste liquid containing organic phosphorus according to claim 1, characterized in that: The system further comprises a gas-liquid separation device connected to the oxidation reactor and the potassium phosphate conversion device respectively.

8. The system for treating waste liquid containing organic phosphorus according to claim 7, characterized in that: The gas-liquid separation device includes a primary gas-liquid separation device and a secondary gas-liquid separation device connected to the primary gas-liquid separation device.

9. The system for treating waste liquid containing organic phosphorus according to claim 8, characterized in that: The system further comprises a generator set connected to the secondary gas-liquid separation device.

10. The system for treating waste liquid containing organic phosphorus according to claim 8, characterized in that: The system further comprises a carbon dioxide recovery system connected to the primary gas-liquid separation device.

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