Electro-oxidation sewage treatment system for pretreatment of evaporated and crystallized organic matters

Abstract

The utility model provides an electrooxidation sewage treatment system for pretreatment of evaporative crystallization organic matters, which relates to the technical field of high-salt high-concentration organic wastewater treatment and comprises an electrolytic catalytic reactor and a spray tower, a plurality of electrode plate groups are arranged in the electrolytic catalytic reactor, and each electrode plate group comprises a cathode plate and an anode plate. A water outlet of the electrolytic catalytic reactor is connected with a water mixing tank, a dosing port is formed in the top of the water mixing tank, and a gas-collecting hood at the top of the electrolytic catalytic reactor is connected with a spray tower. The device disclosed by the utility model has the beneficial effects that the electrolytic catalytic reactor can remove organic matters in sewage in an electrolytic catalytic oxidation manner, and the water mixing tank can add a reducing agent into the water mixing tank through the dosing port so as to remove residual chlorine in a water body discharged by the electrolytic catalytic reactor. And a spray head in the spray tower can spray out spray water containing an alkaline medicament under the action of a spray pump, so that chlorine in the tail gas is removed. According to the device, electrolytic oxidation, chemical reduction and tail gas purification are coupled, and the quality of evaporative crystallization salt is guaranteed.

Description

Technical Field

[0001] This utility model relates to the field of high-salt and high-concentration organic wastewater treatment technology, and in particular to an electro-oxidation wastewater treatment system for pretreatment of evaporative crystallized organic matter. Background Technology

[0002] Industries such as pesticide manufacturing, pharmaceutical and chemical production, and dye production generate large amounts of high-salt, high-concentration chlorine-containing organic wastewater. The treatment of this wastewater typically involves degradation treatment to remove organic pollutants, followed by concentration, evaporation, and crystallization to recover salts. The degradation of organic pollutants in this wastewater is usually achieved through electrocatalytic oxidation. Electrocatalytic oxidation technology directly degrades organic matter or generates strong oxidants (such as hypochlorous acid and hydroxyl radicals) through anodic reactions, offering advantages such as rapid reaction and no secondary pollution. However, existing electro-oxidation systems have the following drawbacks: residual chlorine issues: residual chlorine generated during the electrolysis of chlorine-containing wastewater corrodes subsequent equipment and interferes with the crystallization process; insufficient tail gas treatment: chlorine-containing gases (such as Cl2) released during electrolysis are directly emitted, polluting the environment; low reaction efficiency: single-stage electrolysis reactors suffer from short-circuit issues and low electrode utilization, leading to incomplete treatment.

[0003] Therefore, there is an urgent need for a pretreatment system that integrates high-efficiency electrolysis, residual chlorine removal, and exhaust gas purification to provide stable and safe influent conditions for evaporation and crystallization. Utility Model Content

[0004] In view of this, the present invention provides an electro-oxidation wastewater treatment system for the pretreatment of evaporative crystallized organic matter, including an electrolytic catalytic reactor, a spray tower, and an electrolytic power source;

[0005] The electrolytic catalytic reactor is equipped with an inlet and an outlet; the electrolytic catalytic reactor is equipped with multiple electrode plate groups, each electrode plate group including a cathode plate and an anode plate; the top of the electrolytic catalytic reactor is equipped with a gas collection hood; the positive and negative terminals of the electrolytic power supply are connected to the anode plate and the cathode plate, respectively.

[0006] The outlet is connected to an outlet pipe, the outlet pipe is equipped with a mixing tank, the top of the mixing tank is equipped with a dosing port, and the outlet pipe is connected to an evaporation collection tank.

[0007] The spray tower has an air inlet on its side wall and an exhaust pipe on its top. A spray pipe is fixedly installed on the side wall of the spray tower, and a spray pump is installed on the spray pipe. The lower end of the spray pipe is connected to the spray tower, and the upper end of the spray pipe passes through the side wall of the spray tower and is connected to the spray head inside the spray tower.

[0008] The gas collection hood is connected to the air inlet of the spray tower via a tail gas delivery pipe.

[0009] Furthermore, the electrolytic catalytic reactor is provided with multiple baffles, which divide the cavity inside the electrolytic catalytic reactor into multiple sequentially connected baffle chambers, and each baffle chamber is provided with at least one electrode plate group.

[0010] Furthermore, the inner wall of the electrolytic catalytic reactor is provided with multiple insulating mounting bases, and the edges of both the cathode plate and the anode plate are fixed to the insulating mounting bases.

[0011] Furthermore, a dosing tank is provided on the dosing port, the dosing tank contains liquid reducing agent, and a dosing pump is provided between the dosing port and the dosing tank.

[0012] Furthermore, a stirring assembly is provided on the mixing tank. The stirring assembly includes a stirring motor and a stirring shaft. The upper end of the stirring shaft is connected to the output shaft of the stirring motor, and the lower end of the stirring shaft extends into the mixing tank. The stirring shaft is also provided with multiple stirring blades.

[0013] Furthermore, an air pump is installed on the exhaust pipe delivery pipe.

[0014] Furthermore, the exhaust pipe delivery pipe is also equipped with a gas collection tank and a flow regulating valve, with the gas collection tank located between the air pump and the flow regulating valve.

[0015] Furthermore, the spray tower is also equipped with two air permeable plates, each with air permeable holes, and spray packing is filled between the two air permeable plates.

[0016] Furthermore, a chemical supply tank is provided on the outside of the spray tower, which contains alkaline chemicals. A three-way valve is connected to the spray pump, and a liquid supply pipe is provided on the three-way valve, which is connected to the chemical supply tank.

[0017] Furthermore, the bottom of the spray tower is provided with a drain outlet, and a drain pipe is connected to the drain outlet, which is connected to the evaporation collection tank.

[0018] The beneficial effects of this utility model's electro-oxidation wastewater treatment system for the pretreatment of evaporative crystallization organic matter are as follows: The electro-oxidation wastewater treatment system includes an electrolytic catalytic reactor and a spray tower. The electrolytic catalytic reactor contains multiple sets of electrode plates, each set including a cathode plate and an anode plate connected to an electrolytic power source. The electrolytic catalytic reactor removes organic matter from wastewater through electrolytic catalytic oxidation. An outlet pipe is connected to the outlet of the electrolytic catalytic reactor, and a mixing tank is installed on the outlet pipe. A dosing port is located at the top of the mixing tank, allowing the addition of a reducing agent to remove residual chlorine from the water discharged from the electrolytic catalytic reactor. A gas collection hood is also installed at the top of the electrolytic catalytic reactor to collect chlorine-containing tail gas generated during the electrolysis reaction. A tail gas delivery pipe transports the chlorine-containing tail gas to the spray tower. Spray nozzles in the spray tower, under the action of a spray pump, spray water containing an alkaline agent, thereby removing chlorine from the tail gas and preventing environmental pollution from chlorine-containing tail gas.

[0019] This electro-oxidation wastewater treatment system can efficiently remove organic matter from high-salt, high-concentration chlorine-containing organic wastewater through electrolysis, and can also remove residual chlorine in electrolysis tail gas and electrolysis water through spraying and reduction methods. It couples electrolytic oxidation, chemical reduction and tail gas purification, and has the advantages of high efficiency, environmental protection and economy, making it suitable for the pretreatment of high-salt and high-chlorine industrial wastewater. Attached Figure Description

[0020] Figure 1 This is a schematic diagram of the structure of an electro-oxidation wastewater treatment system for the pretreatment of evaporative crystallized organic matter, according to an embodiment of this utility model.

[0021] Figure 2 yes Figure 1 Cross-sectional view of section AA in the electrolytic catalytic reactor.

[0022] Figure 3 A cross-sectional view of a spray tower in an electro-oxidation wastewater treatment system for pretreatment of evaporative crystallized organic matter, according to an embodiment of this utility model.

[0023] In the above diagram: 1-Electrolytic catalytic reactor, 11-Gas collection hood, 12-Inlet, 13-Outlet, 14-Baffle plate, 15-Cathode plate, 16-Anode plate, 17-Insulating mounting base, 2-Tail gas delivery pipe, 21-Gas collection tank, 22-Air pump, 23-Flow regulating valve, 3-Spray tower, 31-Aeration plate, 32-Aeration hole, 33-Exhaust pipe, 4-Outlet pipe, 5-Mixed water tank, 51-Agitator assembly, 52-Dosing tank, 6-Evaporation collection tank, 7-Spray pipe, 71-Spray head, 8-Spray pump, 81-Three-way valve, 82-Dosing tank, 83-Drain pipe. Detailed Implementation

[0024] To make the objectives, technical solutions and advantages of this utility model clearer, the embodiments of this utility model will be further described below with reference to the accompanying drawings.

[0025] Please refer to Figures 1 to 3 The present invention relates to an electro-oxidation wastewater treatment system for the pretreatment of evaporative crystallized organic matter, comprising an electrolytic catalytic reactor 1, a spray tower 3, and an electrolytic power source.

[0026] The electrolytic catalytic reactor 1 is a rectangular box-shaped body. The electrolytic catalytic reactor 1 is provided with an inlet 12 and an outlet 13. The electrolytic catalytic reactor 1 is provided with multiple electrode plate groups. Each electrode plate group includes a cathode plate 15 and an anode plate 16. The top of the electrolytic catalytic reactor 1 is provided with a gas collection hood 11. The positive and negative electrodes of the electrolytic power supply are connected to the anode plate 16 and the cathode plate 15, respectively.

[0027] A water outlet 13 is connected to a water outlet pipe 4, and a mixing tank 5 is installed on the water outlet pipe 4. A dosing port is located on the top of the mixing tank 5, and the water outlet pipe 4 is connected to the evaporation collection tank 6. A dosing tank 52 is installed on the dosing port, and the dosing tank 52 contains a liquid reducing agent (e.g., sodium sulfite solution). A dosing pump is installed between the dosing port and the dosing tank 52. The dosing pump is used to add the liquid reducing agent from the dosing tank 52 into the mixing tank 5 to remove residual chlorine from the water after electrolysis. The liquid stored in the evaporation collection tank 6 can then undergo evaporation and crystallization treatment.

[0028] The spray tower 3 has an air inlet on its side wall, and the gas collection hood 11 is connected to the air inlet of the spray tower 3 through the tail gas delivery pipe 2. The top of the spray tower 3 is equipped with an exhaust pipe 33, and a spray pipe 7 is fixedly installed on the side wall of the spray tower 3. A spray pump 8 is installed on the spray pipe 7 and is located on the side wall of the spray tower 3. The lower end of the spray pipe 7 is connected to the spray tower 3 and extends through the side wall of the spray tower 3 to the bottom of the internal cavity of the spray tower 3. The upper end of the spray pipe 7 passes through the side wall of the spray tower 3 and is connected to the spray head 71 inside the spray tower 3. The bottom of the internal cavity of the spray tower 3 is filled with spray water containing alkaline agents. The spray pump 8 is used to draw up the spray water at the bottom of the spray tower 3, pump it into the spray head 71 and spray it out, thereby adsorbing and removing chlorine gas in the tail gas.

[0029] In operation, the wastewater to be treated in this electro-oxidation wastewater treatment system is introduced into the electrolytic catalytic reactor 1 through inlet 12. The electrode plate assembly electrolyzes the wastewater, with the wastewater near the anode plate 16 generating strong oxidants (such as hypochlorous acid and hydroxyl radicals) during electrolysis to oxidize and remove organic matter. The electrolysis process also produces electrolysis tail gas, which mainly consists of hydrogen, oxygen, and chlorine, with chlorine being the primary harmful component. Some hypochlorous acid and dissolved chlorine will remain in the electrolyzed water. The electrolyzed water then enters the mixing tank 5. Liquid reducing agents from the dosing tank 52 are added to the mixing tank 5 at a predetermined flow rate to remove residual chlorine from the electrolyzed water. The tail gas generated during electrolysis is collected in the gas collection hood 11 and then enters the spray tower 3 through the tail gas delivery pipe 2. The spray pump 8 draws spray water from the bottom of the spray tower 3, pumps it into the spray head 71, and sprays it out, thereby adsorbing and removing chlorine from the tail gas.

[0030] This electro-oxidation wastewater treatment system can efficiently remove organic matter from high-salt, high-concentration chlorine-containing organic wastewater through electrolysis, and can also remove residual chlorine in electrolysis tail gas and electrolyzed water through spraying and reduction. It couples electrolytic oxidation, chemical reduction, and tail gas purification, combining high efficiency, environmental friendliness, and economy, and is particularly suitable for the pretreatment of high-salt, high-chlorine industrial wastewater.

[0031] In a preferred embodiment, the electrolytic catalytic reactor 1 is provided with multiple baffle plates 14. The baffle plates 14 and the inner wall of the electrolytic catalytic reactor 1 have baffle openings and are arranged in an alternating pattern, thereby dividing the cavity inside the electrolytic catalytic reactor 1 into multiple sequentially connected baffle chambers. Each baffle chamber is provided with at least one electrode plate assembly. This baffle chamber structure can prolong the residence time of wastewater in the electrolytic catalytic reactor 1, improving electrode utilization and organic matter degradation efficiency.

[0032] In a preferred embodiment, the inner wall of the electrolytic catalytic reactor 1 is provided with a plurality of insulating mounting bases 17, and the edges of the cathode plate 15 and the anode plate 16 are fixed on the insulating mounting bases 17.

[0033] In a preferred embodiment, a stirring assembly 51 is mounted on the mixing tank 5. The stirring assembly 51 includes a stirring motor and a stirring shaft. The upper end of the stirring shaft is connected to the output shaft of the stirring motor, and the lower end of the stirring shaft extends into the mixing tank 5. The stirring shaft is also provided with multiple stirring blades. The stirring assembly 51 is used to thoroughly mix the water in the mixing tank 5, thereby ensuring that residual chlorine in the water is fully removed.

[0034] In a preferred embodiment, the exhaust gas delivery pipe 2 is equipped with an air extraction pump 22, a gas collection tank 21, and a flow regulating valve 23. The gas collection tank 21 is located between the air extraction pump 22 and the flow regulating valve 23. The air extraction pump 22 is used to extract the exhaust gas from the gas collection hood 11 into the gas collection tank 21 for storage. The flow regulating valve 23 is used to regulate the air intake of the spray tower 3. It can be understood that the electrolytic catalytic reactor 1 of this electro-oxidation wastewater treatment system can have multiple reactors, meaning that one spray tower 3 can correspond to multiple electrolytic catalytic reactors 1, enabling the spray tower 3 to simultaneously treat the exhaust gas generated by multiple electrolytic catalytic reactors 1.

[0035] In a preferred embodiment, the spray tower 3 is further provided with two permeable plates 31, each with permeable holes 32, and granular spray packing is filled between the two permeable plates 31. The spray packing can be PP (polypropylene), PVC (polyvinyl chloride), PVDF (polyvinylidene fluoride), CPVC (chlorinated polyvinyl chloride), etc. The spray packing can increase the gas-liquid contact area, allowing the exhaust gas to flow in a tortuous manner within the packing layer, ensuring sufficient contact with the spray liquid and guaranteeing that the chlorine in the pollutant exhaust gas is fully absorbed.

[0036] In a preferred embodiment, a chemical supply tank 82 is also provided on the outside of the spray tower 3. The chemical supply tank 82 contains a liquid alkaline agent, which can be sodium hydroxide, i.e., the spray liquid is a sodium hydroxide solution. A three-way valve 81 is connected to the spray pump 8, and a liquid supply pipe is also provided on the three-way valve 81. The liquid supply pipe is connected to the chemical supply tank 82. A drain outlet is provided at the bottom of the spray tower 3, and a drain pipe 83 is connected to the drain outlet. The drain pipe 83 is connected to the evaporation collection tank 6. The supply tank 82 is used to provide spray liquid to the spray tower 3. When in use, the spray pump 8 draws spray liquid from the supply tank 82 through the supply pipe for spraying. After the spray liquid in the spray tower 3 reaches a certain amount, the three-way valve 81 is switched so that the spray pump 8 draws the spray liquid accumulated at the bottom of the spray tower 3 for circulating spraying. When the concentration of the agent in the spray liquid drops to a certain concentration, the spray liquid can be discharged into the evaporation collection tank 6 through the drain outlet. Then the spray liquid in the supply tank 82 is drawn again to achieve the effect of refreshing the spray liquid.

[0037] In this document, the directional terms such as front, back, top, and bottom are defined based on the location of the components in the accompanying drawings and their relative positions to each other, solely for the purpose of clarity and convenience in expressing the technical solution. It should be understood that the use of these directional terms should not limit the scope of protection claimed in this application.

[0038] Where there is no conflict, the above embodiments and features described herein can be combined with each other.

[0039] The above description is only a preferred embodiment of the present utility model and is not intended to limit the present utility model. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.

Claims

1. An electro-oxidative wastewater treatment system for the evaporation crystallization of organic matter pre-treatment, characterized by: It includes an electrolytic catalytic reactor (1), a spray tower (3), and an electrolytic power source; The electrolytic catalytic reactor (1) is provided with an inlet (12) and an outlet (13); the electrolytic catalytic reactor (1) is provided with multiple electrode plate groups, each electrode plate group including a cathode plate (15) and an anode plate (16); the top of the electrolytic catalytic reactor (1) is provided with a gas collection hood (11); the positive and negative poles of the electrolytic power supply are connected to the anode plate (16) and the cathode plate (15) respectively; The outlet (13) is connected to an outlet pipe (4), the outlet pipe (4) is equipped with a mixing tank (5), the top of the mixing tank (5) is equipped with a dosing port, and the outlet pipe (4) is connected to an evaporation collection tank (6). The spray tower (3) has an air inlet on its side wall and an exhaust pipe (33) on its top. A spray pipe (7) is fixedly installed on the side wall of the spray tower (3). A spray pump (8) is installed on the spray pipe (7). The lower end of the spray pipe (7) is connected to the spray tower (3), and the upper end of the spray pipe (7) passes through the side wall of the spray tower (3) and is connected to the spray head (71) inside the spray tower (3). The gas collection hood (11) is connected to the air inlet of the spray tower (3) through the tail gas delivery pipe (2).

2. An electro-oxidation wastewater treatment system for the pre-treatment of evaporative crystallization organic matter according to claim 1, characterized in that: The electrolytic catalytic reactor (1) is provided with a plurality of baffle plates (14), which divide the cavity inside the electrolytic catalytic reactor (1) into a plurality of sequentially connected baffle chambers, and each baffle chamber is provided with at least one electrode plate group.

3. An electro-oxidation wastewater treatment system for the pre-treatment of evaporative crystallization organic matter according to claim 1, characterized in that: The inner wall of the electrolytic catalytic reactor (1) is provided with multiple insulating mounting bases (17), and the edges of the cathode plate (15) and the anode plate (16) are fixed on the insulating mounting bases (17).

4. An electro-oxidation wastewater treatment system for the pre-treatment of evaporative crystallization organic matter according to claim 1, characterized in that: The dosing port is equipped with a dosing tank (52), which contains a liquid reducing agent. A dosing pump is provided between the dosing port and the dosing tank (52).

5. An electro-oxidation wastewater treatment system for the pre-treatment of evaporative crystallization organic matter according to claim 1, characterized in that: The mixing tank (5) is provided with a stirring assembly (51), which includes a stirring motor and a stirring shaft. The upper end of the stirring shaft is connected to the output shaft of the stirring motor, and the lower end of the stirring shaft extends into the mixing tank (5). The stirring shaft is also provided with multiple stirring blades.

6. The electro-oxidation wastewater treatment system for pretreatment of evaporative crystallization organic matter according to claim 1, characterized in that: An air pump (22) is installed on the exhaust pipe (2).

7. An electro-oxidation wastewater treatment system for the pre-treatment of evaporative crystallization organic matter according to claim 6, characterized in that: The exhaust pipe (2) is also equipped with a gas collection tank (21) and a flow regulating valve (23), with the gas collection tank (21) located between the air pump (22) and the flow regulating valve (23).

8. An electro-oxidation wastewater treatment system for the pre-treatment of evaporative crystallization organic matter according to claim 1, characterized in that: The spray tower (3) is also equipped with two air permeable plates (31), each with an air permeable hole (32), and spray packing is filled between the two air permeable plates (31).

9. The electro-oxidation wastewater treatment system for pretreatment of evaporative crystallization organic matter according to claim 1, characterized in that: The spray tower (3) is also equipped with a medicine supply box (82) on the outside. The medicine supply box (82) contains alkaline agents. The spray pump (8) is connected to a three-way valve (81). The three-way valve (81) is also equipped with a liquid supply pipe, which is connected to the medicine supply box (82).

10. An electro-oxidation wastewater treatment system for the pre-treatment of evaporative crystallization organic matter according to claim 1, characterized in that: The spray tower (3) is provided with a drain outlet at the bottom, and a drain pipe (83) is connected to the drain outlet. The drain pipe (83) is connected to the evaporation collection tank (6).

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