Hydrogen-coupled electrocoagulation process for treating wastewater

Abstract

The application discloses a hydrogen-coupled electric flocculation treatment process for sewage, and relates to the field of sewage treatment, comprising a water tank main body and a backflow assembly arranged outside the water tank main body; the inner cavity of the water tank main body is divided into a water distribution area, a flocculation reaction area communicated with the water distribution area and a water outlet area connected with the flocculation reaction area, and the inner wall of the flocculation reaction area is provided with an electrode plate slot group, and the electrode plate slot group is provided with an electrode plate assembly. The hydrogen collection cover plate is arranged on the cathode plate, the gas outlet pipe is connected with the existing equipment gas dissolving pump, the hydrogen gas generated between the cathode plate and the induction electrode plate can rise to the inside of the gas area, the hydrogen gas is transported to the outside sedimentation tank or the flocculation reaction area through the characteristics of the gas dissolving pump, the reducing property of the hydrogen gas is utilized to improve the performance of ferrous iron, the electric flocculation effect is strengthened, the hydrogen gas is consumed in the process of maintaining the activity of the ferrous iron, the hydrogen gas concentration in the environment is reduced, and the explosion is prevented.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of sewage treatment, in particular to a hydrogen coupled electrocoagulation process for treating sewage. BACKGROUND

[0002] Electrocoagulation is also known as electroflocculation or electrocoagulation, which is a water treatment technology developed on the basis of chemical coagulation and electrolysis. Electrocoagulation process is more and more concerned due to its simple device, high treatment efficiency, more types of pollutants that can be removed, no secondary pollution and other characteristics. Electrocoagulation uses electrolysis method to treat sewage. In the electrolysis process, harmful substances in the original wastewater are oxidized and reduced on the anode and cathode respectively through electrolysis, and then converted into harmless substances to achieve wastewater purification.

[0003] However, the existing electrocoagulation device has the following problems in the process of electrolysis:

[0004] 1. During the operation of the electrocoagulation device, hydrogen gas is generated on the surface of the cathode. When the concentration of the generated hydrogen gas in the environment accumulates to 4% to 75.6%, there is an explosion risk, and the safety is low.

[0005] 2. The anode plate of the electrocoagulation device is directly connected to the power supply. As the running time of the equipment increases, the anode plate is worn out. Replacement of the anode plate requires shutdown and then disassembly and replacement, which is very inconvenient. SUMMARY

[0006] The purpose of the present application is to provide a hydrogen coupled electrocoagulation process for treating sewage to solve the problems raised in the background art.

[0007] To solve the above technical problems, the technical solution adopted by the present application is:

[0008] A hydrogen coupled electrocoagulation process for treating sewage, comprising a water tank body and a backflow assembly arranged outside the water tank body.

[0009] The inner cavity of the water tank body is divided into a water distribution area, a flocculation reaction area communicating with the water distribution area, and a water outlet area connected to the flocculation reaction area. The inner wall of the flocculation reaction area is provided with a plurality of plate insertion slots, and the plate insertion slots are inserted with a plurality of plate assemblies. The plate assembly is covered with a hydrogen collection cover plate.

[0010] The plate assembly comprises a plurality of cathode plates arranged in parallel, a plurality of anode plates arranged in parallel, and a plurality of induction plates arranged between the cathode plates and the anode plates.

[0011] The hydrogen collection cover plate is arranged on the cathode plate and abuts on the plate insertion slot group, and one end of the hydrogen collection cover plate is connected with an air outlet pipe.

[0012] Preferably, the backflow assembly comprises a backflow pump, a sludge discharge pipe connected to the input end of the backflow pump, and a three-way pipe connected to the output end of the backflow pump, one end of the sludge discharge pipe is connected to the flocculation reaction zone, and the three-way pipe is connected with a circulating pipe and an external pipe connected to the water distribution zone, and ball valves are arranged on the sludge discharge pipe, the circulating pipe and the external pipe respectively. The sludge discharge pipe is used to extract the precipitate after electrolysis, and the circulating pipe can be used to empty the water collected in the equipment and circulate the water in the water tank body to make it mix uniformly.

[0013] Preferably, the bottom of the flocculation reaction zone is provided with a V-shaped inclined plate, and the inner wall of the flocculation reaction zone is provided with a sludge discharge hole, and the flocculation reaction zone is connected to the sludge discharge pipe through the sludge discharge hole. The V-shaped inclined plate can help the precipitate to incline and concentrate and be discharged from the flocculation reaction zone.

[0014] Preferably, the surface of the water tank body is connected with a water inlet pipe, and the water inlet pipe is connected to the water distribution zone. It is used for sewage to enter the water tank body for electrolysis treatment.

[0015] Preferably, the surface of the water tank body is connected with a water discharge pipe, and the water discharge pipe is connected to the bottom of the water outlet zone. It is used for the treated sewage to flow into the external precipitation zone.

[0016] Preferably, the inner wall of the flocculation reaction zone is connected with a support pipe, and the bottom of the electrode plate assembly is attached to the surface of the support pipe. It is used to support the cathode plate, the anode plate and the sensing plate to ensure the stability of the cathode plate, the anode plate and the sensing plate.

[0017] Preferably, the inner wall of the hydrogen gas collecting cover plate is connected with a clamping plate, the clamping plate is attached to the surface of the cathode plate, and a gas zone is formed between the inner cavity of the hydrogen gas collecting cover plate and the cathode plate. The clamping plate leaves a gap between the cathode plate and the hydrogen gas collecting cover plate, which is convenient for the gas generated to rise to the inside of the gas zone.

[0018] Preferably, the outer side of the water tank body is provided with a support frame, and the support frame is connected with a stepping plate. It is beneficial for workers to stand on the top to disassemble and replace the electrode plate assembly.

[0019] The technical scheme provides a kind of efficient sewage treatment process, comprising the following steps:

[0020] S1, sewage is connected to water inlet pipe by water pump, to make sewage be pumped into to the inside of water distribution zone;

[0021] S2, sewage enters the inside of flocculation reaction zone from the communication between water distribution zone and flocculation reaction zone, under the action of direct current, cathode plate and anode plate are electrified to occur electrochemical reaction respectively, and sensing plate is used to indirectly precipitate ion between cathode plate and anode plate to hydrolyze in water and occur flocculation reaction;

[0022] S3. After the flocculation reaction occurs, the generated hydrogen gas will rise into the gas zone and then be connected to the dissolved gas pump through the gas outlet pipe. The dissolved gas pump will inject the hydrogen gas into the hydrogen reaction tank for dissolution.

[0023] S4. After the flocculation reaction, the liquid can flow into the effluent zone and be discharged to the sedimentation zone through the drain pipe.

[0024] Due to the adoption of the above technical solution, the technical progress achieved by this invention compared to the prior art is as follows:

[0025] 1. This invention provides a hydrogen-coupled electrocoagulation wastewater treatment process to address the problem of excessively high hydrogen concentrations and potential explosions in existing electrocoagulation equipment. A hydrogen collection cover is installed on the cathode plate, and its outlet pipe is connected to the dissolved air pump in existing equipment. The hydrogen gas generated between the cathode plate and the induction plate can rise through the gaps in the cover design into the gas zone. The dissolved air pump then transports the hydrogen gas to an external sedimentation tank or flocculation reaction zone. After the hydrogen gas returns to the sedimentation tank or flocculation reaction zone, its reducing properties enhance the performance of ferrous iron, strengthening the electrocoagulation effect. The hydrogen is consumed while maintaining the activity of the ferrous iron, thus reducing the hydrogen concentration in the environment and preventing explosions.

[0026] 2. This invention provides a hydrogen-coupled electrocoagulation process for wastewater treatment. To address the problem of inconvenient replacement of anode plates due to wear and tear requiring shutdown and disassembly, an induction electrode is placed within an electrode slot assembly, positioned between the cathode and anode plates. This allows the induction electrode to indirectly precipitate ferrous iron, thus reducing anode plate wear and protecting it. Furthermore, the induction electrode does not require a power connection when placed in the electrode slot assembly; replacement is simple and quick, requiring only the removal of the induction electrode. Attached Figure Description

[0027] Figure 1 This is a schematic diagram of the overall structure of the present invention;

[0028] Figure 2 This is a schematic diagram of the overall rear view structure of the present invention;

[0029] Figure 3 This is a schematic diagram of the internal structure of the water tank body of the present invention;

[0030] Figure 4 This is a schematic diagram of the electrode slot assembly structure of the present invention;

[0031] Figure 5 This is a schematic diagram of the electrode assembly structure of the present invention;

[0032] Figure 6 This is a schematic cross-sectional view of the hydrogen collection cover plate of the present invention;

[0033] Figure 7 The schematic diagram of the card structure of the present application.

[0034] In the figure:

[0035] 1, water tank main body; 11, water distribution area; 111, water inlet pipe; 12, flocculation reaction area; 121, V-shaped inclined plate; 122, sludge discharge hole; 123, support pipe; 13, water outlet area; 131, water discharge pipe;

[0036] 2, reflux assembly; 21, reflux pump; 22, sludge discharge pipe; 23, three-way pipe; 24, circulation pipe; 25, external connection pipe; 26, ball valve;

[0037] 3, polar plate slot group;

[0038] 4, polar plate assembly; 41, cathode plate; 42, anode plate; 43, inductive polar plate;

[0039] 5, hydrogen gas collection cover plate; 51, gas outlet pipe; 52, card;

[0040] 6, gas area; 7, step plate. DETAILED DESCRIPTION

[0041] The present application will be further described in detail below in combination with examples:

[0042] For example, Figures 1-7As shown, the present application provides a hydrogen coupling electroflocculation treatment wastewater process, comprising a water tank body 1 and a reflux assembly 2 arranged outside the water tank body 1; the inner cavity of the water tank body 1 is divided into a water distribution area 11, a flocculation reaction area 12 communicated with the water distribution area 11, and a water outlet area 13 connected to the flocculation reaction area 12, and the inner wall of the flocculation reaction area 12 is provided with an electrode plate slot group 3, and the electrode plate slot group 3 is provided with an electrode plate assembly 4, and the electrode plate assembly 4 is provided with a hydrogen collection cover plate 5; the inner wall of the flocculation reaction area 12 is connected with a support pipe 123, and the bottom of the electrode plate assembly 4 is attached to the surface of the support pipe 123, which is used to support the electrode plate assembly 4, avoid the sinking of the electrode plate assembly 4, and ensure the stability of the electrode plate assembly 4; the electrode plate assembly 4 comprises a plurality of cathode plates 41 arranged in parallel, a plurality of anode plates 42 arranged in parallel, and a plurality of induction plates 43 arranged between the cathode plates 41 and the anode plates 42; the hydrogen collection cover plate 5 is arranged on the cathode plate 41 and abuts on the electrode plate slot group 3, and one end of the hydrogen collection cover plate 5 is connected with an air outlet pipe 51, and the inner wall of the hydrogen collection cover plate 5 is connected with a clamping plate 52, which is attached to the surface of the cathode plate 41, and a gas area 6 is formed between the inner cavity of the hydrogen collection cover plate 5 and the cathode plate 41, specifically, the design of the clamping plate 52 leaves a gap between the cathode plate 41 and the hydrogen collection cover plate 5, which facilitates the rising of the generated gas into the gas area 6, and facilitates the extraction after connecting the external gas dissolving pump, and the outer side of the water tank body 1 is provided with a support frame, and the support frame is connected with a step plate 7.

[0043] Further, as shown in Figure 2 and Figure 3 the surface of the water tank body 1 is connected with a water inlet pipe 111, the water inlet pipe 111 is communicated with the water distribution area 11, the water inlet pipe 111 is used to connect the water pump to enter the wastewater into the water tank body 1 for electrolysis treatment, the surface of the water tank body 1 is connected with a drain pipe 131, the drain pipe 131 is communicated with the bottom of the water outlet area 13, and the drain pipe 131 is used to flow the treated wastewater into the external sedimentation tank.

[0044] As shown in Figure 2 and Figure 3As shown, the backflow assembly 2 comprises a backflow pump 21, a sludge discharge pipe 22 connected to the input end of the backflow pump 21, and a three-way pipe 23 connected to the output end of the backflow pump 21. The other end of the sludge discharge pipe 22 is connected to the flocculation reaction zone 12. The three-way pipe 23 is connected with a circulating pipe 24 and an external pipe 25 which are connected to the water distribution zone 11. Ball valves 26 are arranged on the sludge discharge pipe 22, the circulating pipe 24 and the external pipe 25 respectively. A V-shaped inclined plate 121 is arranged at the bottom of the flocculation reaction zone 12, and a sludge discharge hole 122 is formed in the inner wall of the flocculation reaction zone 12. The flocculation reaction zone 12 is connected with the sludge discharge pipe 22 through the sludge discharge hole 122. The V-shaped inclined plate 121 can help the precipitate generated in the flocculation reaction zone 12 to incline and concentrate at the bottom, and then be connected with the sludge discharge hole 122 and the sludge discharge pipe 22, so that the backflow pump 21 can pump out the precipitate after electrolysis. The circulating pipe 24 can be used to empty the water collected in the water tank main body 1, and at the same time, can circulate the water in the water tank main body 1 to make the water mix uniformly.

[0045] As shown in the drawings, Figures 1-7 The embodiment of the present application provides a high-efficiency sewage treatment process, which comprises the following steps:

[0046] S1, the sewage is pumped into the water distribution zone 11 through the water pump and the water inlet pipeline 111;

[0047] S2, the sewage enters the flocculation reaction zone 12 from the communication between the water distribution zone 11 and the flocculation reaction zone 12. Under the action of direct current, the cathode plate 41 and the anode plate 42 are electrified to generate electrochemical reaction, and the inductive plate 43 is used to indirectly generate ions between the cathode plate 41 and the anode plate 42 to hydrolyze in water to generate flocculation reaction;

[0048] After the cathode plate 41 and the anode plate 42 are electrified, green foam appears between the cathode plate 41 and the inductive plate 43, which is "ferrous + hydrogen + water". Yellow foam appears between the anode plate 42 and the inductive plate 43, which is "oxygen + water". Compared with the air floatation performance of the existing equipment, the air floatation performance is stronger, and the pollutants can be carried away from the reaction system faster, so as to improve the sewage treatment efficiency. In the flocculation reaction process, the ferrous is not directly precipitated by the anode plate 42, but is indirectly precipitated between the cathode plate 41 and the anode plate 42 by the inductive plate 43. The inductive plate 43 generates loss, which indirectly reduces the loss of the anode plate 42, so as to protect the anode plate 42. When the inductive plate 43 is placed on the plate slot group 3, it does not need to be connected to the power supply. When it is replaced, it can be replaced by extracting the inductive plate 43, which is convenient and fast.

[0049] Further, the inductive plate 43 is usually made of iron plate or aluminum plate.

[0050] S3, when the flocculation reaction occurs, the generated hydrogen gas rises to the gas zone 6, and is connected to the dissolved air pump through the gas outlet pipe 51, and the dissolved air pump injects the hydrogen gas into the hydrogen reaction tank for dissolution;

[0051] Wherein, because the gas outlet pipe 51 is connected to the existing equipment dissolved air pump, when the dissolved air pump is started, the hydrogen gas generated between the cathode plate 41 and the inductive plate 43 can rise to the inside of the gas zone 6 through the gap left by the clamping plate 52, and thus the hydrogen gas is transported into the hydrogen reaction tank by the characteristics of the dissolved air pump, and the hydrogen reaction tank is the outside sedimentation tank or flocculation reaction zone 12, so that after the hydrogen gas is returned to the sedimentation tank or flocculation reaction zone 12, the hydrogen gas can improve the performance of ferrous iron by using the reducing property of hydrogen gas, and the effect of electroflocculation is strengthened, and the hydrogen gas is consumed in the process of maintaining the activity of ferrous iron, so that the concentration of hydrogen gas in the environment can be reduced, and the risk of explosion can be reduced.

[0052] Wherein, further, the sedimentation tank is connected to the water outlet zone 13, and ferrous ions exist in the inside.

[0053] S4, the liquid after the flocculation reaction can flow into the water outlet zone 13, and is discharged to the sedimentation zone through the drain pipe 131.

[0054] It should be pointed out that in the description of the present disclosure, it is necessary to point out that unless otherwise explicitly specified and limited, the terms "mounting", "connecting", "connecting" should be understood broadly, for example, it can be fixedly connected, or it can be detachably connected, or integrally connected, it can be mechanically connected, it can be directly connected, or indirectly connected through an intermediate medium, it can be the internal communication of two elements or the interaction relationship between two elements. For ordinary skilled in the art, the specific meaning of the above terms in the present disclosure can be understood according to the specific circumstances.

[0055] The above has made a detailed description of the present application generally, but some modifications or improvements can be made on the basis of the present application, which is obvious to those skilled in the art. Therefore, the modifications or improvements without departing from the spirit and principles of the present application are within the protection scope of the present application.

Claims

1. A hydrogen-coupled electrocoagulation process for treating wastewater, characterized in that: Includes the main body of the water tank and the reflux assembly located on the outside of the main body of the water tank; The inner cavity of the water tank body is divided into a water distribution area, a flocculation reaction area connected to the water distribution area, and a water outlet area connected to the flocculation reaction area. The inner wall of the flocculation reaction area is provided with an electrode slot group, an electrode assembly is inserted into the electrode slot group, and a hydrogen collection cover is provided on the electrode assembly. The electrode assembly includes several cathode plates arranged in parallel, several anode plates arranged in parallel, and multiple induction electrode plates disposed between the cathode plates and the anode plates. The induction electrode plates are made of iron plates. The hydrogen collection cover is placed on the cathode plate and abuts against the electrode slot assembly. One end of the hydrogen collection cover is connected to an outlet pipe. The inner wall of the hydrogen collection cover is connected to a retaining plate. The retaining plate is attached to the surface of the cathode plate. A gas zone is formed between the inner cavity of the hydrogen collection cover and the cathode plate. After the flocculation reaction occurs, the generated hydrogen gas rises into the gas zone and is then connected to the dissolved gas pump through the gas outlet pipe. The dissolved gas pump injects the hydrogen gas into the hydrogen reaction tank for dissolution. The reducing properties of hydrogen gas are used to improve the performance of ferrous iron and enhance the electrocoagulation effect. The hydrogen reaction tank is the flocculation reaction zone.

2. The hydrogen-coupled electrocoagulation wastewater treatment process according to claim 1, characterized in that: The reflux assembly includes a reflux pump, a sludge discharge pipe connected to the input end of the reflux pump, and a tee pipe connected to the output end of the reflux pump. The other end of the sludge discharge pipe is connected to the flocculation reaction zone, and the tee pipe is connected to a circulation pipe and an external pipe connected to the water distribution zone. Ball valves are respectively installed on the sludge discharge pipe, the circulation pipe, and the external pipe.

3. The hydrogen-coupled electrocoagulation wastewater treatment process according to claim 2, characterized in that: The bottom of the flocculation reaction zone is provided with a V-shaped inclined plate, and the inner wall of the flocculation reaction zone is provided with a sludge discharge hole, which is connected to the sludge discharge pipe.

4. The hydrogen-coupled electrocoagulation wastewater treatment process according to claim 1, characterized in that: The surface of the main body of the water tank is connected to a water inlet pipe, which is connected to the water distribution area.

5. The hydrogen-coupled electrocoagulation wastewater treatment process according to claim 1, characterized in that: A drain pipe is connected to the surface of the main body of the water tank, and the drain pipe is connected to the bottom of the water outlet area.

6. The hydrogen-coupled electrocoagulation wastewater treatment process according to claim 1, characterized in that: The inner wall of the flocculation reaction zone is connected to a support tube, and the bottom of the electrode assembly is attached to the surface of the support tube.

7. The hydrogen-coupled electrocoagulation wastewater treatment process according to claim 1, characterized in that: A support frame is provided on the outside of the main body of the water tank, and a step plate is connected to the support frame.

8. A method of using a hydrogen-coupled electrocoagulation wastewater treatment process according to any one of claims 1-7, characterized in that, Includes the following steps: S1. The sewage is connected to the inlet pipe through a water pump, so that the sewage is pumped into the water distribution area; S2. Wastewater enters the flocculation reaction zone through the connection between the water distribution zone and the flocculation reaction zone. Under the action of direct current, the cathode plate and anode plate are energized to produce an electrochemical reaction. Ions are indirectly deposited between the cathode plate and anode plate by induction plates, which then hydrolyze in the water and cause a flocculation reaction. S3. After the flocculation reaction occurs, the generated hydrogen will rise into the gas zone and then be connected to the dissolved gas pump through the gas outlet pipe. The dissolved gas pump will inject the hydrogen into the hydrogen reaction tank for dissolution. S4. After the flocculation reaction, the liquid can flow into the effluent zone and be discharged to the sedimentation zone through the drain pipe.

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