A dichloromethane wastewater treatment device

Abstract

The present application provides a dichloromethane wastewater treatment device, which relates to the technical field of chemical wastewater treatment. It includes a box body. One side of the box body is connected to a water inlet pipe, and the other side is connected to a water outlet pipe. A partition board is arranged inside the box body, and the partition board divides the box body into a catalytic area and a reaction area. The water inlet pipe is connected to the treatment area, and the water outlet pipe is connected to the recovery area. An electrolysis device is arranged in the recovery area, and a gas collecting pipe is opened at the top of the recovery area. The present application has the effect of reducing the pollution of water bodies.

Description

Technical Field

[0001] The present application relates to the technical field of chemical wastewater treatment. Specifically, it relates to a dichloromethane wastewater treatment device. Background Art

[0002] Dichloromethane is an organic compound with the chemical formula CH2Cl2. It is a colorless and transparent liquid with an irritating odor similar to ether. It is slightly soluble in water, soluble in ethanol and ether, and is a non-flammable low-boiling solvent under normal use conditions. Its vapor forms a weakly combustible mixture only when it becomes highly concentrated in hot air. It is often used to replace flammable petroleum ether, ether, etc.

[0003] On October 27, 2017, the International Agency for Research on Cancer of the World Health Organization released a preliminary list of carcinogens. Dichloromethane was included in the list of Group 2A carcinogens. On July 23, 2019, dichloromethane was included in the list of toxic and harmful water pollutants.

[0004] However, the inventor believes that after the enterprise uses dichloromethane, the discharged wastewater will contain a small amount of dichloromethane. Since dichloromethane cannot be biodegraded, general sewage treatment processes cannot remove it. As a result, the discharged wastewater contains a small amount of dichloromethane and cannot meet the discharge standards, causing pollution to the water body. Summary of the Invention

[0005] In order to reduce the pollution to the water body, the present application provides a dichloromethane wastewater treatment device.

[0006] A dichloromethane wastewater treatment device provided by the present application adopts the following technical solutions:

[0007] A dichloromethane wastewater treatment device includes a box body. One side of the box body is connected to a water inlet pipe, and the other side is connected to a water outlet pipe. A partition is arranged inside the box body, and the partition divides the box body into a catalytic area and a reaction area. The water inlet pipe is connected to the treatment area, and the water outlet pipe is connected to the recovery area. An electrolysis device is arranged in the recovery area, and a gas collecting pipe is opened at the top of the recovery area.

[0008] By adopting the above technical solution, in the actual working process, first, the wastewater containing dichloromethane is introduced into the water inlet pipe. The wastewater enters the catalytic zone through the water inlet pipe. At this time, the electrolysis device is started. Under the action of the DSA electrode with catalytic activity, the charge on the electrode electrolyte accelerates the reaction. The organic matter in the clear liquid of dichloromethane wastewater is degraded at the anode or reacts under the action of the anode to generate oxidants such as hydroxyl radicals, ozone, chlorate, and hypochlorite to further degrade the organic matter, so as to achieve the purpose of degrading dichloromethane. The wastewater that has completed electrolysis flows into the reaction zone and then leaves the box through the water outlet pipe. The gases such as chlorine, hydrogen, and ozone generated during the reaction process are collected through the gas collecting pipe and discharged uniformly after treatment, thereby effectively reducing harmful substances such as dichloromethane in the wastewater and significantly reducing the pollution to the water body.

[0009] Optionally, an air supply pipe is arranged in the box body, and a first aeration nozzle is connected to the air supply pipe. The first aeration nozzle is located below the electrolysis device.

[0010] By adopting the above technical solution, during the electrolysis of the wastewater, the air supply pipe is started, and high-pressure air is input through the air supply pipe. The high-pressure air is sprayed into the catalytic zone through the first aeration nozzle, thereby improving the treatment efficiency of dichloromethane in the catalytic zone, further improving the treatment efficiency of the clear liquid of dichloromethane wastewater, reducing the concentration of toxic substances contained in the discharged sewage, and further reducing the pollution to the water body.

[0011] Optionally, a first partition is arranged in the catalytic zone. The top of the first partition is fixedly connected to the inner top wall of the box body. The first partition is located on the side of the electrolysis device close to the water inlet pipe. A first partition channel for the wastewater to pass through is formed between the bottom of the first partition and the inner bottom wall of the box body.

[0012] By adopting the above technical solution, when the clear liquid of dichloromethane wastewater is injected into the inside of the box body, due to the existence of the first partition, the clear liquid of the wastewater can only gradually enter the catalytic zone through the first partition channel for electrolytic catalysis, thus avoiding a large amount of clear liquid of the wastewater entering the catalytic zone in a short time, further improving the treatment efficiency of the clear liquid of the wastewater, effectively reducing the harmful substances contained in the clear liquid of the wastewater, thereby improving the environmental protection effect to a certain extent and reducing the pollution and damage to the environment.

[0013] Optionally, a second partition is arranged in the reaction zone. The top of the second partition is fixedly connected to the inner top wall of the box body. The second partition is located on the side of the partition close to the water outlet pipe. A second partition channel for the wastewater to pass through is formed between the bottom of the second partition and the inner bottom wall of the box body.

[0014] By adopting the above technical solution, when the clarified wastewater enters the catalytic zone through the first partition channel and completes the electrolytic degradation catalysis, the clarified wastewater overflows the partition plate and enters the reaction zone through the second partition channel formed between the second partition and the inner bottom wall of the box body for slow reaction, which can effectively prevent a large amount of clarified wastewater from surging in within a short time.

[0015] Optionally, a second aeration nozzle is connected to the aeration pipe, and the second aeration nozzle is located in the reaction zone.

[0016] By adopting the above technical solution, when treating wastewater, the aeration pipe is opened, and high-pressure air is filled into the reaction zone through the second aeration nozzle of the aeration pipe, thereby effectively diluting the accumulated gas in the reaction zone, preventing excessive toxic gas from accumulating and causing secondary pollution to the water body in the reaction zone. And since a large amount of hydrogen is accumulated in the reaction zone, by filling high-pressure gas, the hydrogen content can also be reduced, avoiding the risk of explosion in the box body due to the too high hydrogen concentration within a short time.

[0017] Optionally, a through hole is formed in the top of the second partition, a filter plate is arranged in the through hole, a plurality of filter holes are formed in the filter plate, and the filter plate is detachably connected to the second partition.

[0018] By adopting the above technical solution, when degrading and electrolyzing the clarified wastewater containing dichloromethane, a large amount of chlorine gas, hydrogen gas, etc. will be generated. Due to the existence of the partition plate and the second partition, these gases are difficult to enter the reaction zone in a short time and are discharged through the gas collecting pipe. At this time, by arranging a filter plate with filter holes on the second partition, the gas generated in a short time can be discharged into the reaction zone, achieving the purpose of quickly reducing the gas concentration in the catalytic zone.

[0019] Optionally, a perforation for the filter plate to pass through is formed in the top of the box body, a sealing plate is arranged on the side of the filter plate away from the second partition, the sealing plate is used to seal the gap between the perforation and the filter plate, and a limiting member is arranged on the sealing plate, and the limiting member is used to limit the position of the sealing plate on the box body.

[0020] By adopting the above technical solution, during the electrolytic degradation process of the clarified wastewater containing dichloromethane, some chloric acid and hypochlorous acid will appear. Under the continuous impact of high-pressure gas, chloric acid and hypochlorous acid are extremely volatile, which will cause relatively serious corrosion to the filter plate. At this time, the limitation of the position of the sealing plate on the box body by the limiting member is released, and then the sealing plate can be driven to move away from the box body, and then the filter plate can be driven to move away from the box body to realize the disassembly of the filter plate. Then the filter plate can be replaced or repaired, thereby improving the overall service life and practical performance of the device.

[0021] Optionally, the limiting member is provided as a plug board. An installation groove is formed in the sealing plate along the length direction of the sealing plate. The plug board is slidably arranged in the installation groove. A jack for inserting the plug board is formed in the inner wall of the perforation. A driving member is arranged on the sealing plate, and the driving member is used to drive the plug board to move.

[0022] By adopting the above technical solution, when it is necessary to disassemble the filter plate, the driving member drives the plug board to move in a direction away from the jack, so that the plug board is disengaged from the jack. At this time, the sealing plate can be driven to move in a direction away from the perforation, thereby realizing the disassembly of the filter plate. When it is necessary to install the filter plate, first drive the sealing plate to move into the perforation, and then drive the plug board to move into the jack through the driving member, so as to complete the limitation of the position of the sealing plate. At this time, the installation of the filter plate can be completed. The operation is convenient and fast, which is convenient for improving the work efficiency of the staff.

[0023] Optionally, the driving member is provided as a driving plate. A connection hole communicating with the installation groove is formed at the top of the sealing plate. The driving plate is rotatably arranged in the connection hole. A transmission gear is rotatably arranged in the connection hole. One end of the plug board far away from the installation hole is fixedly connected with a rack. The transmission gear meshes with the rack, and the driving plate is in transmission connection with the transmission gear.

[0024] By adopting the above technical solution, when it is necessary to drive the plug board to move, first drive the driving plate to deflect. The driving plate drives the gear to deflect, and the gear drives the rack to move. Along with the movement of the rack, the filter plate can be driven to move. In this process, the transmission is carried out through the gear and rack, and the transmission is more accurate and reliable, with better practicability.

[0025] Optionally, an installation shaft is rotatably arranged in the connection hole. A driving gear is coaxially and fixedly arranged on the installation shaft. The driving gear meshes with the transmission gear. The installation shaft is fixedly connected with the driving plate. An elastic member is arranged in the connection hole, and the elastic member is used to drive the driving plate to deflect towards the inside of the connection hole.

[0026] By adopting the above technical solution, in the actual use process, under the drive of the elastic member, the driving plate always has a tendency to move towards the inside of the connection hole, so that the volume occupied by the sealing plate can be reduced to a certain extent. And in the actual use process, since the driving plate always has a tendency to deflect towards the inside of the connection hole, the plug board always has a tendency to move towards the inside of the jack, which can play a good role in limiting the position of the sealing plate and can effectively prevent the filter plate from shifting in position due to the vibration of the machine.

[0027] To sum up, the present application includes at least one of the following beneficial technical effects:

[0028] 1. The electrolytic degradation catalysis of the clarified wastewater containing dichloromethane is carried out through DSA electrodes, so as to degrade the pollutants and organic matters in the clarified wastewater, thereby achieving the purpose of treating the wastewater, effectively reducing the harmful substances in the wastewater, and further reducing the pollution to the water body.

[0029] 2. By carrying out aeration treatment of high-pressure gas on the clarified wastewater in the catalytic zone, the treatment efficiency of dichloromethane in the catalytic zone is improved, the treatment efficiency of the clarified wastewater containing dichloromethane is further improved, and the concentration of toxic substances contained in the discharged sewage is reduced.

[0030] 3. By setting the first partition and the second partition, the flow rate of the clarified wastewater in the box body can be effectively reduced in a short time, avoiding the accumulation of a large amount of clarified wastewater to be treated in a short time, resulting in the decline of the treatment effect of the clarified wastewater, thereby improving the environmental protection effect to a certain extent and reducing the pollution and damage to the environment.

[0031] 4. By setting a filter plate with filter holes on the second partition, the gas generated in a short time can be discharged into the reaction zone, achieving the purpose of quickly reducing the gas concentration in the catalytic zone. BRIEF DESCRIPTION OF THE DRAWINGS

[0032] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings required to be used in the embodiments will be briefly introduced below. It should be understood that the following drawings only show some embodiments of the present application, and therefore should not be regarded as a limitation of the scope. For those of ordinary skill in the art, other related drawings can be obtained based on these drawings without creative efforts.

[0033] Figure 1 It is a schematic diagram of the overall structure of the embodiment of the present application;

[0034] Figure 2 It is a schematic diagram of the partial structure of the filter plate and the second partition of the embodiment of the present application;

[0035] Figure 3 It is a partial cross-sectional view of the box body of the embodiment of the present application;

[0036] Figure 4 It is a cross-sectional view of the sealing plate of the embodiment of the present application;

[0037] Figure 5 It is a partial cross-sectional view of the sealing plate of the embodiment of the present application.

[0038] Icons: 1. Box body; 11. Water inlet pipe; 12. Water outlet pipe; 13. Partition board; 14. Catalytic zone; 15. Reaction zone; 16. Electrolysis device; 17. Gas collecting pipe; 2. Aeration pipe; 21. First aeration nozzle; 22. Second aeration nozzle; 3. First partition; 31. First partition passage; 4. Second partition; 41. Second partition passage; 5. Through hole; 51. Filter plate; 52. Filter hole; 53. Perforation; 54. Sealing plate; 55. Sealing strip; 6. Limiting part; 61. Installation groove; 62. Jack; 7. Driving part; 71. Connecting hole; 72. Transmission gear; 73. Rack; 74. Installation shaft; 75. Driving gear; 76. Elastic part. Detailed implementation manners

[0039] To make the objectives, technical solutions and advantages of the embodiments of the present application clearer, the technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present application. Apparently, the described embodiments are some but not all of the embodiments of the present application. Usually, the components of the embodiments of the present application described and illustrated in the accompanying drawings here can be arranged and designed in various different configurations.

[0040] Therefore, the following detailed description of the embodiments of the present application provided in the accompanying drawings is not intended to limit the scope of the present application claimed, but merely represents the selected embodiments of the present application. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present application without creative efforts shall fall within the scope of protection of the present application.

[0041] It should be noted that: similar reference numerals and letters denote similar items in the following drawings. Therefore, once an item is defined in one drawing, it does not need to be further defined and explained in subsequent drawings.

[0042] In the description of the embodiments of the present application, it should be noted that if terms such as "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc. indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, or the orientation or positional relationship when the inventive product is normally placed, it is only for the convenience of describing the present application and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be construed as a limitation to the present application. In addition, the terms "first", "second", "third", etc. are only used for descriptive distinction and cannot be construed as indicating or implying relative importance.

[0043] In addition, when terms such as "horizontal", "vertical", and "hanging" appear, it does not mean that the components are required to be absolutely horizontal or hanging, but they can be slightly inclined. For example, "horizontal" only means that its direction is more horizontal relative to "vertical", and it does not mean that the structure must be completely horizontal, but it can be slightly inclined.

[0044] In the description of the embodiments of the present application, "a plurality of" represents at least two.

[0045] In the description of the embodiments of the present application, it should also be noted that unless otherwise clearly specified and limited, when terms such as "set", "installed", "connected", and "coupled" appear, they should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium, and it can be the communication inside two components. For those of ordinary skill in the art, the specific meanings of the above terms in the present application can be understood according to specific circumstances.

[0046] The following will further describe the present application in detail with reference to the Figures 1-5 accompanying drawings.

[0047] The embodiments of the present application disclose a dichloromethane wastewater treatment device.

[0048] Referring to Figure 1 , a dichloromethane wastewater treatment device includes a box body 1. One side of the box body 1 is communicated with a water inlet pipe 11, and the other side is communicated with a water outlet pipe 12. A partition 13 is arranged in the box body 1. The partition 13 divides the box body 1 into a catalytic zone 14 and a reaction zone 15. The water inlet pipe 11 is communicated with the treatment zone, and the water outlet pipe 12 is communicated with the recovery zone. An electrolysis device 16 is arranged in the recovery zone, and a gas collecting pipe 17 is opened at the top of the recovery zone.

[0049] As an implementation manner of the present application, referring to Figure 1 , the electrolysis device 16 is set as a DSA electrode plate, and multiple DSA electrode plates are distributed in a grid shape in sequence.

[0050] Referring to Figure 1 , an air supply pipe 2 is arranged in the box body 1. A first aeration nozzle 21 is communicated with the air supply pipe 2. The first aeration nozzle 21 is located below the electrolysis device 16.

[0051] As an implementation manner of the present application, two first aeration nozzles 21 are provided, and the two aeration nozzles are distributed directly below the DSA electrode plate. As another implementation manner of the present application, the first aeration nozzle 21 can also be set to three, four or more, and the specific quantity is determined according to the volume of the box body 1 and the volume of the catalytic zone 14.

[0052] During the electrolysis of wastewater, the aeration pipe 2 is started, and high-pressure air is input through the aeration pipe 2. The high-pressure air is sprayed into the catalytic zone 14 through the first aeration nozzle 21, thereby improving the treatment efficiency of dichloromethane in the catalytic zone 14, further enhancing the treatment efficiency of the clear liquid of dichloromethane wastewater, reducing the concentration of toxic substances contained in the discharged sewage, and thus further reducing the pollution of the water body.

[0053] Refer to Figure 1 , a first partition 3 is arranged in the catalytic zone 14. The top of the first partition 3 is fixedly connected to the inner top wall of the box body 1. The first partition 3 is located on the side of the electrolysis device 16 close to the water inlet pipe 11. A first partition passage 31 for wastewater to pass through is formed between the bottom of the first partition 3 and the inner bottom wall of the box body 1.

[0054] When injecting the clear liquid of dichloromethane wastewater into the interior of the box body 1, due to the existence of the first partition 3, the clear liquid of wastewater can only gradually enter the catalytic zone 14 through the first partition passage 31 for electrolytic catalysis, thereby avoiding a large amount of clear liquid of wastewater entering the catalytic zone 14 in a short time. Furthermore, the treatment efficiency of the clear liquid of wastewater is improved, and the harmful substances contained in the clear liquid of wastewater are effectively reduced, thus improving the environmental protection effect to a certain extent and reducing the pollution and damage to the environment.

[0055] Refer to Figure 1 , a second partition 4 is arranged in the reaction zone 15. The top of the second partition 4 is fixedly connected to the inner top wall of the box body 1. The second partition 4 is located on the side of the partition 13 close to the water outlet pipe 12. A second partition passage 41 for wastewater to pass through is formed between the bottom of the second partition 4 and the inner bottom wall of the box body 1.

[0056] When the clear liquid of wastewater enters the catalytic zone 14 through the first partition passage 31 and completes the electrolytic degradation catalysis, the clear liquid of wastewater overflows the partition 13 and enters the reaction zone 15 through the second partition passage 41 formed between the second partition 4 and the inner bottom wall of the box body 1 for slow reaction, which can effectively avoid a large amount of clear liquid of wastewater surging in a short time.

[0057] Refer to Figure 1 , a second aeration nozzle 22 is connected to the aeration pipe 2. The second aeration nozzle 22 is located in the reaction zone 15. When treating wastewater, the aeration pipe 2 is opened, and high-pressure air is filled into the reaction zone 15 through the second aeration nozzle 22 of the aeration pipe 2, thereby effectively diluting the accumulated gas in the reaction zone 15, avoiding the secondary pollution of the water body in the reaction zone 15 caused by the accumulation of excessive toxic gases, and since a large amount of hydrogen accumulates in the reaction zone 15, by filling high-pressure gas, the hydrogen content can also be reduced, avoiding the risk of explosion in the box body 1 due to the excessive hydrogen concentration in a short time.

[0058] Refer toFigure 2 , 3 , a through hole 5 is provided in the top of the second partition 4, a filter plate 51 is arranged in the through hole 5, and a plurality of filter holes 52 are provided in the filter plate 51.

[0059] When degrading and electrolyzing the waste water supernatant containing dichloromethane, a large amount of chlorine gas, hydrogen gas, etc. will be generated. Due to the presence of the partition plate 13 and the second partition 4, these gases are difficult to enter the reaction zone 15 in a short time and are discharged through the gas collecting pipe 17. At this time, by arranging the filter plate 51 with filter holes 52 on the second partition 4, the gas generated in a short time can be discharged into the reaction zone 15, so as to quickly reduce the gas concentration in the catalytic zone 14.

[0060] Refer to Figure 3 , a through hole 53 for the filter plate 51 to pass through is provided in the top of the box body 1. A sealing plate 54 is arranged on the side of the filter plate 51 away from the second partition 4. The sealing plate 54 is used to seal the gap between the through hole 53 and the filter plate 51. A sealing sticker is fixedly installed at the bottom of the sealing plate 54. The material of the sealing sticker is set as rubber, which can further seal the gap between the through hole 53 and the filter plate 51, so as to further reduce the escape of harmful gases.

[0061] Refer to Figure 3 , 4 , the filter plate 51 is detachably connected to the second partition 4. A limiting member 6 is arranged on the sealing plate 54. The limiting member 6 is used to limit the position of the sealing plate 54 on the box body 1. The limiting member 6 is set as an insertion plate. An installation groove 61 is provided on the sealing plate 54 along the length direction of the sealing plate 54. The insertion plate is slidably arranged in the installation groove 61, and an insertion hole 62 for the insertion plate to insert is provided on the inner wall of the through hole 53.

[0062] When the filter plate 51 needs to be disassembled, the driving member 7 drives the insertion plate to move in a direction away from the insertion hole 62, so that the insertion plate disengages from the insertion hole 62. At this time, the sealing plate 54 can be driven to move in a direction away from the through hole 53, so as to realize the disassembly of the filter plate 51. When the filter plate 51 needs to be installed, first drive the sealing plate 54 to move into the through hole 53, and then drive the insertion plate to move into the insertion hole 62 through the driving member 7, so as to complete the limitation of the position of the sealing plate 54. At this time, the installation of the filter plate 51 can be completed. The operation is convenient and fast, which is convenient for improving the work efficiency of the staff.

[0063] Refer to Figure 4 , 5, a driving member 7 is provided on the sealing plate 54. The driving member 7 is used to drive the insertion plate to move, and the driving member 7 is set as a driving plate. A connection hole 71 communicating with the installation groove 61 is opened at the top of the sealing plate 54. The driving plate is rotatably arranged in the connection hole 71. A transmission gear 72 is rotatably arranged in the connection hole 71. One end of the insertion plate away from the installation hole is fixedly connected with a rack 73. The transmission gear 72 meshes with the rack 73, and the driving plate is in transmission connection with the transmission gear 72.

[0064] When it is necessary to drive the insertion plate to move, first drive the driving plate to deflect. The driving plate drives the gear to deflect, and the gear drives the rack 73 to move. With the movement of the rack 73, the filter plate 51 can be driven to move. During this process, the transmission is carried out through the gear rack 73, and the transmission is more accurate and reliable, with better practicability.

[0065] Refer to Figure 4 , 5 , an installation shaft 74 is rotatably arranged in the connection hole 71. A driving gear 75 is coaxially and fixedly arranged on the installation shaft 74. The driving gear 75 meshes with the transmission gear 72, and the installation shaft 74 is fixedly connected with the driving plate.

[0066] Refer to Figure 5 , an elastic member 76 is arranged in the connection hole 71. The elastic member 76 is used to drive the driving plate to deflect towards the inside of the connection hole 71, and the elastic member 76 is set as a torsion spring. The torsion spring is sleeved on the installation shaft 74. One end of the torsion spring is fixedly connected with the installation shaft 74, and the other end is fixedly connected with the inner wall of the connection hole 71.

[0067] In the actual use process, under the drive of the elastic member 76, the driving plate always has a tendency to move towards the inside of the connection hole 71, so as to reduce the volume occupied by the sealing plate 54 to a certain extent. And in the actual use process, since the driving plate always has a tendency to deflect towards the inside of the connection hole 71, the insertion plate always has a tendency to move towards the insertion hole 62, which can play a good role in limiting the position of the sealing plate 54 and can effectively prevent the filter plate 51 from shifting in position due to the vibration of the machine.

[0068] The implementation principle of the dichloromethane wastewater treatment device in the embodiment of the present application is as follows:

[0069] In the actual working process, first, the wastewater containing dichloromethane is introduced into the water inlet pipe 11. The wastewater enters the catalytic zone 14 through the water inlet pipe 11. At this time, the electrolysis device 16 is started. Under the action of the DSA electrode with catalytic activity, the charge on the electrode electrolyte accelerates the reaction. The organic matter in the wastewater supernatant is degraded through the anode or reacts under the action of the anode to generate oxidants such as hydroxyl radicals, ozone, chlorate, and hypochlorite to further degrade the organic matter, so as to achieve the purpose of degrading dichloromethane. The wastewater that has completed electrolysis flows into the reaction zone 15 and then leaves the box body 1 through the water outlet pipe 12. Gases such as chlorine, hydrogen, and ozone generated during the reaction are collected through the gas collecting pipe 17 and discharged uniformly after treatment, thereby effectively reducing harmful substances such as dichloromethane in the wastewater and significantly reducing the pollution of water bodies.

[0070] The main conversion process of dichloromethane during this process is as follows:

[0071] In the first step, dichloromethane is converted into chloroform under the action of strong oxidants such as hypochlorous acid and chloric acid:

[0072] CH2Cl2 + Cl2 → CHCl3 + HCl, CH2Cl2 + HClO → CHCl3 + H2O;

[0073] In the second step, chloroform is converted into formic acid and hydrochloric acid under strong electrolysis:

[0074] 2CHCl3 + 4H2O → 2CH2O2 + 6HCl;

[0075] In the third step, formic acid is finally directly oxidized to carbon dioxide and water through electron transfer on the electrode plate:

[0076] CH2O2 + O2 → 2CO2 + 2H2O.

[0077] So far, the complete conversion process of dichloromethane is completed.

[0078] The above is only the preferred embodiment of the present application and is not used to limit the present application. For those skilled in the art, various changes and modifications can be made to the present application. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application shall be included in the protection scope of the present application.

Claims

1. A dichloromethane wastewater treatment device, characterized in that: The invention comprises a box body, one side of the box body is connected to a water inlet pipe, the other side is connected to a water outlet pipe, a partition is provided in the box body, the partition separates the box body into a catalytic zone and a reaction zone, the water inlet pipe is connected to the treatment zone, the water outlet pipe is connected to the recovery zone, an electrolysis device is provided in the recovery zone, and a gas collecting pipe is provided on the top of the recovery zone; An aeration pipe is provided in the box body, and the aeration pipe is connected to a second aeration nozzle, and the second aeration nozzle is located in the reaction zone; A second partition is provided in the reaction zone, a through hole is provided on the top of the second partition, a filter plate is provided in the through hole, a plurality of filter holes are provided on the filter plate, and the filter plate is detachably connected to the second partition; A sealing plate is provided on the side of the filter plate away from the second partition, and a driving member is provided on the sealing plate, and the driving member is configured as a driving plate. A connecting hole communicating with the mounting groove is provided on the top of the sealing plate, and an elastic member is provided in the connecting hole, and the elastic member is used to drive the driving plate to deflect toward the connecting hole.

2. The dichloromethane wastewater treatment device according to claim 1, wherein: The aeration pipe is connected to a first aeration nozzle, and the first aeration nozzle is located below the electrolysis device.

3. The dichloromethane wastewater treatment device according to claim 2, characterized in that: A first partition is provided in the catalytic zone, the top of the first partition is fixedly connected to the inner top wall of the box body, the first partition is located on the side of the electrolysis device close to the water inlet pipe, and a first partition channel for wastewater to pass through is formed between the bottom of the first partition and the inner bottom wall of the box body.

4. A dichloromethane wastewater treatment device according to claim 3, characterized in that: The top of the second partition is fixedly connected to the inner top wall of the box body. The second partition is located on the side of the partition close to the outlet pipe. A second partition channel for wastewater to pass through is formed between the bottom of the second partition and the bottom wall of the box body.

5. A dichloromethane wastewater treatment device according to claim 4, characterized in that: The top of the box body is provided with a through hole for the filter plate to pass through, and the sealing plate is used to close the gap between the through hole and the filter plate. The sealing plate is provided with a limiting member, and the limiting member is used to limit the position of the sealing plate on the box body.

6. The dichloromethane wastewater treatment device according to claim 5, characterized in that: The limiting member is configured as an insert plate, a mounting groove is provided on the sealing plate along the length direction of the sealing plate, the insert plate is slidably arranged in the mounting groove, a socket for inserting the insert plate is provided on the inner wall of the through hole, and the driving member is used to drive the insert plate to move.

7. A dichloromethane wastewater treatment device according to claim 6, characterized in that: The driving plate is rotatably arranged in the connecting hole, a transmission gear is rotatably arranged in the connecting hole, one end of the plug plate away from the mounting hole is fixedly connected to a rack, the transmission gear is engaged with the rack, and the driving plate is transmission-connected to the transmission gear.

8. The dichloromethane wastewater treatment device according to claim 7, wherein: A mounting shaft is rotatably provided in the connecting hole, a driving gear is coaxially fixedly provided on the mounting shaft, the driving gear is meshed with the transmission gear, and the mounting shaft is fixedly connected to the driving plate.

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