Electrochemical enhanced sludge cracking method and device

Abstract

The invention relates to the technical field of sewage treatment, in particular to an electrochemical enhanced sludge cracking method and device, the electrochemical enhanced sludge cracking method and device are used for a sewage treatment system, the system comprises a biochemical tank and a sedimentation tank, the biochemical tank is communicated with the sedimentation tank, and the sedimentation tank is provided with a sludge port; the method comprises the following steps: S1, extracting residual sludge in a sedimentation tank into an electrochemical tank through a sludge port; s2, adding an alkaline solution into the electrochemical cell, monitoring the pH value in the electrochemical cell in real time, and keeping the mud-water mixture in the electrochemical cell alkaline; s3, introducing alternating current into the electrochemical cell, and monitoring the reaction degree of the residual sludge in the electrochemical cell in real time; s4, when the excess sludge reacts in the electrochemical tank to break walls and release nutrient substances, conveying wall-broken supernate of the sludge into a biochemical tank, collecting the sludge in the electrochemical tank, and drying the sludge. According to the present invention, the carbon source obtained through the electrochemical reaction can flow back to the biochemical pool so as to improve the carbon-nitrogen ratio of the sewage, and the denitrification effect is good.

Description

Technical Field

[0001] The present invention relates to the technical field of sewage treatment, and more specifically, to an electrochemical enhanced sludge lysis method and device. Background Art

[0002] With the development of cities and the deepening of environmental protection concepts, the scale of urban sewage treatment is expanding. At present, the activated sludge method is the mainstream process in municipal sewage treatment. This process has high organic matter removal efficiency and mature operation, but it inevitably produces a large amount of residual sludge by-products. There are a large number of harmful substances such as organic salts, pathogens and heavy metals in the residual sludge. Improper treatment will cause secondary pollution to the environment and is difficult to treat. In addition, urban sewage in my country generally has the characteristics of low carbon source content and serious insufficient C / N ratio, which restricts the reaction speed of denitrification in the activated sludge method, resulting in poor denitrification effect.

[0003] At present, there is an application of electrochemical technology in sludge treatment and disposal. Electrochemical sludge wall breaking is through electrode catalysis, using various active free radicals with strong oxidizing properties generated in the electrochemical process to destroy the sludge floc structure, oxidatively decompose extracellular polymers (EPS), release free water and intracellular substances, and further oxidize and decompose the intracellular substances and mineralize them, so as to achieve sludge treatment. According to the different electrochemical mechanisms, it can be divided into two processes: direct wall breaking and indirect wall breaking. The direct wall breaking process is to directly oxidize the sludge through the electrochemical reaction at the anode. Under the action of the current, H2O or OH- in the sludge is electrolyzed near the anode to form physically adsorbed OH. The microorganisms in the sludge react with OH on the electrode surface to achieve the wall breaking effect, thereby releasing intracellular free water and improving the sludge dewatering performance. OH continues to react with the released intracellular organic matter to decompose it into CO2 and H2O, so as to achieve the purpose of sludge wall breaking. The indirect wall breaking process is to produce strongly oxidizing intermediates through electrochemical reactions to act on pollutants. When there are anions such as chloride ions and sulfate ions in the sludge, these ions can form strong oxidizing sulfate ions (SO4-), active chlorine (ClO-) and other free radicals under the action of electrochemistry, which can cause the microorganisms in the sludge to break the cell wall and lyse the cells, releasing free water and intracellular substances. The intermediate active substances and the released intracellular organic matter continue to undergo oxidation and mineralization reactions, achieving the effect of sludge wall breaking. However, there are still problems such as low efficiency and energy loss, which need further improvement to achieve more efficient results.

[0004] The Chinese patent of the prior art CN201610571338.1 discloses a sewage treatment device, specifically a denitrification sewage treatment tank, including a cylindrical reaction tank, an outlet tank above the reaction tank, the outlet tank has an outlet, and a cover on the top of the outlet tank; the reaction tank is connected to an outwardly convex annular water inlet tank below, the annular water inlet tank is connected to the water inlet, and a packing tube is installed in the reaction tank and the annular water inlet tank, the packing tube is composed of a double-layer net to form an annular cylinder, and the middle of the double-layer net of the packing tube is filled with catalytic iron filler; the annular water inlet tank is below the sludge sedimentation tank; the sludge sedimentation tank has a sludge discharge port. The denitrification sewage treatment tank provided by the technical scheme adopts an annular water inlet method to fully allow the sewage to contact the filler in the filler tube, and the water is inlet from the bottom of the filler tube to prevent the filler from depositing at the bottom of the filler tube, but the carbon source content in the reaction tank of the scheme is low, which makes the nitrification reaction speed slow and leads to poor denitrification effect. Summary of the invention

[0005] The purpose of the present invention is to overcome the shortcomings of the prior art reaction tank in that the carbon source content is low and the denitrification effect is poor, and to propose an electrochemical enhanced sludge lysis method and device, which can improve the carbon-nitrogen ratio of sewage and make the denitrification effect of sewage better.

[0006] To achieve the above object, an electrochemical enhanced sludge lysis method of the present invention is used in a sewage treatment system, wherein the system comprises a biochemical tank and a sedimentation tank, wherein the biochemical tank is connected to the sedimentation tank, and the sedimentation tank is provided with a sludge outlet;

[0007] The method comprises the following steps:

[0008] S1: extracting the remaining sludge in the sedimentation tank into the electrochemical cell through the sludge port;

[0009] S2: adding an alkaline solution into the electrochemical cell, monitoring the pH value in the electrochemical cell in real time and maintaining the mud-water mixture in the electrochemical cell to be alkaline;

[0010] S3: passing alternating current into the electrochemical cell, and monitoring the reaction degree of the sludge in the electrochemical cell in real time;

[0011] S4: When the sludge is broken by reaction in the electrochemical cell and nutrients are released, the supernatant of the broken sludge is transported to the biochemical cell, and the sludge in the electrochemical cell is collected and dried.

[0012] In the technical scheme, the remaining sludge in the sedimentation tank is extracted by a sludge pump, and an alkaline solution is added to the electrochemical cell to make the mud-water mixture alkaline, which is conducive to the growth and metabolism of microorganisms. The alkaline condition can increase the activity of microorganisms, thereby enhancing the treatment effect. At the same time, the alkaline environment can also reduce equipment corrosion and extend the service life of the equipment. The use of alternating current when power is turned on can effectively offset this polarization phenomenon and maintain the sensitivity and stability of the electrode. The sludge breaks the wall due to the electrochemical reaction in the electrochemical cell, releasing nutrients to obtain a liquid phase, which contains a large amount of biodegradable organic matter. The liquid phase is returned to the anoxic section and anaerobic section of the biochemical pool to supplement the carbon source for denitrification and anaerobic phosphorus release, which can effectively increase the carbon-nitrogen ratio of the sewage, strengthen sludge lysis, and is beneficial to the denitrification of sewage by denitrifying bacteria. At the same time, it will not introduce a large amount of nitrogen and phosphorus elements to affect the effluent water quality.

[0013] As a preferred solution, in order to control the electrochemical reaction rate to ensure the carbon source replenishment speed, in step S1, the sludge accounts for 85% to 95% of the volume of the electrochemical cell.

[0014] As a preferred solution, in step S2, the alkaline solution is a sodium hydroxide solution or a potassium hydroxide solution. Since water with greater hardness will form hard scale during heating or stirring, the composition is complex and difficult to clean and remove. In order to reduce the hardness of the water, sodium hydroxide and potassium hydroxide are added to react with calcium substances in the mud and water mixture, and the calcium ions in the hard water are formed into flocculent precipitation, which is filtered in time, thereby reducing the hardness of the water.

[0015] As a preferred solution, in step S2, the alkaline solution is added and the pH value in the electrochemical cell is maintained at 9-10. By adjusting the pH value, heavy metal ions can be effectively removed, organic pollutants can be removed, water hardness can be reduced, and redox reactions can be accelerated.

[0016] As a preferred solution, in step S3, the voltage of the alternating current is 30V to 36V, and the current density is 0.5A / cm 2 ~1A / cm 2 Alternating current can cause continuous electrolysis reaction on the electrode surface, enhance the activity of electrons, ions and molecules in the mud-water mixture, and improve the accuracy and response speed of the conductivity cell. At the same time, alternating current can cause the electrode to continuously charge and discharge, thereby removing bubbles or sediment on the electrode surface and keeping the electrode clean and sensitive.

[0017] As a preferred solution, in step S3, the sludge retention time is 6 hours to 10 hours.

[0018] As a preferred solution, in step S3, the mud-water mixture in the electrochemical cell is stirred.

[0019] As a preferred solution, during steps S2 to S4, the electrochemical cell is aerated with an aeration intensity of 3 m 3 / m 2 h~20m 3 / m 2 h. By forcing air into the mud-water mixture, the sewage in the pool is oxygenated by contact with the air, and the liquid is stirred to accelerate the transfer of oxygen in the air to the liquid, preventing suspended objects in the pool from sinking, strengthening the contact between organic matter in the pool and microorganisms and dissolved oxygen, and oxidizing and decomposing organic matter in the sewage. During the aeration process, the formation of small bubbles can greatly improve the dissolution efficiency of oxygen, ensuring the healthy reproduction of microorganisms in an aerobic environment.

[0020] As a preferred solution, in step S3, the heat generated by the electrochemical cell reaction is collected. The alkaline electrochemical method will generate a large amount of heat, part of which can be used to continue to increase the speed of sludge wall breaking, and the remaining heat can be collected by a heat exchanger and reused in the sludge drying process.

[0021] To achieve the above-mentioned purpose, the present invention provides a device for realizing the above-mentioned electrochemical enhanced sludge lysis method, comprising a tank body, an electrode, an agitator, a dosing pump, a sludge hopper, a heat exchanger, an air flotation machine and an aerator, wherein the electrode is arranged in the tank body, the agitator is arranged in the tank body and is located below the electrode, the side wall of the tank body is made of heat-conductive material, the heat exchanger is attached to the side wall of the tank body, one side of the tank body is connected to a sludge inlet pipe, and the other side of the tank body is connected to a return pipe, the dosing pump is connected to the tank body, the aerator is connected to the tank body, the output end of the air flotation machine is connected to the bottom of the tank body, an overflow port is provided on one side of the top of the tank body, the sludge hopper is arranged on one side of the tank body and the top of the sludge hopper is connected to the overflow port.

[0022] In the technical scheme, the residual sludge in the sedimentation tank enters the tank body through the sludge inlet pipe, and an alkaline solution is added to the mud-water mixture in the tank body through a dosing pump. The dosing pump can monitor the pH value in the tank body in real time to realize dynamic adjustment of the pH value of the tank body. Alternating current is passed through the electrode to the mud-water mixture in the tank body, so that the sludge breaks the wall in the tank body and releases nutrients. The liquid phase subsequently produced flows into the anoxic section and anaerobic section of the biochemical tank through a reflux pipe to supplement the carbon source for denitrification and anaerobic phosphorus release, thereby improving the denitrification effect of microorganisms and ensuring the effluent water quality. The flotation machine can pass air into the tank body in the form of tiny bubbles, so that the tiny bubbles adhere to the sludge floating on the surface to form a water-air-sludge three-phase mixed system. After the sludge adheres to the bubbles, its density is less than that of water, and it floats to the water surface, forming a scum layer that is separated through the overflow port and enters the sludge hopper. The sludge is statically compressed and settled, and finally dried.

[0023] Compared with the prior art, the present invention has the following beneficial effects:

[0024] 1. The present invention collects the residual sludge in the sedimentation tank and performs alkaline electrochemical treatment to strengthen the sludge lysis. The filtrate obtained by the sludge lysis contains a large amount of organic matter, which can be used as a high-quality carbon source and returned to the anoxic section and anaerobic section of the biochemical pool to supplement the carbon source for denitrification and anaerobic phosphorus release, which is beneficial to the denitrification of sewage by denitrifying bacteria, and at the same time will not introduce a large amount of nitrogen and phosphorus elements to affect the effluent water quality.

[0025] 2. The present invention collects the waste heat energy generated by the electrochemical cell reaction and reuses it in the link with heat demand in the sludge drying or sewage process, thereby realizing energy recycling, energy saving and environmental protection.

[0026] 3. The present invention uses a flotation machine to generate tiny bubbles to adhere to the sludge in the electrochemical cell, which is convenient for collecting and processing the sludge and has the effect of reducing the amount of sludge. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] Figure 1 is a flow chart of the electrochemical enhanced sludge pyrolysis method of the present invention;

[0028] Figure 2 It is a schematic diagram of the structure of the electrochemical enhanced sludge pyrolysis device of the present invention;

[0029] Figure 3 It is a structural schematic diagram of another embodiment of the electrochemical enhanced sludge pyrolysis device of the present invention;

[0030] Figure 4 The present invention is a flow chart of a sewage treatment process.

[0031] In the figure: a tank body 1; an electrode 2; a stirrer 3; a dosing pump 4; a sludge bucket 5; a heat exchanger 6; an air flotation machine 7; an aerator 8; a cleaning assembly 9; a telescopic cylinder 91; a crossbar 92; a connecting rod 93; and a soft scraper 94. DETAILED DESCRIPTION

[0032] The drawings are only for illustrative purposes and cannot be construed as limiting the present invention. To better illustrate the present embodiment, some parts of the drawings may be omitted, enlarged, or reduced, and do not represent the size of the actual product. For those skilled in the art, it is understandable that some well-known structures and their descriptions may be omitted in the drawings. The positional relationships described in the drawings are only for illustrative purposes and cannot be construed as limiting the present invention.

[0033] The same or similar numbers in the drawings of the embodiments of the present invention correspond to the same or similar parts; in the description of the present invention, it should be understood that if the terms "upper", "lower", "left", "right", "long", "short" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, they are only for the convenience of describing the present invention 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. Therefore, the terms describing the positional relationship in the drawings are only used for illustrative purposes and cannot be understood as limitations on this patent. For ordinary technicians in this field, the specific meanings of the above terms can be understood according to specific circumstances.

[0034] The technical solution of the present invention is further described in detail below through specific embodiments and in conjunction with the accompanying drawings:

[0035] Embodiment 1:

[0036] like Figure 1 As shown, this embodiment provides an electrochemical enhanced sludge lysis method for a sewage treatment system, wherein the system comprises a biochemical tank and a sedimentation tank, wherein the biochemical tank is connected to the sedimentation tank, and the sedimentation tank is provided with a sludge outlet;

[0037] The method comprises the following steps:

[0038] S1: extracting the remaining sludge in the sedimentation tank into the electrochemical cell through the sludge port;

[0039] S2: adding an alkaline solution into the electrochemical cell, monitoring the pH value in the electrochemical cell in real time and maintaining the mud-water mixture in the electrochemical cell to be alkaline;

[0040] S3: passing alternating current into the electrochemical cell, and monitoring the reaction degree of the sludge in the electrochemical cell in real time;

[0041] S4: When the sludge is broken by reaction in the electrochemical cell and nutrients are released, the supernatant of the broken sludge is transported to the biochemical cell, and the sludge in the electrochemical cell is collected and dried.

[0042] Specifically, in step S1, the sludge accounts for 85% to 95% of the volume of the electrochemical cell.

[0043] Specifically, in step S2, the alkaline solution is a sodium hydroxide solution or a potassium hydroxide solution with a concentration of 0.5 mol / L to 3 mol / L.

[0044] Specifically, in step S2, the alkaline solution is added and the pH value in the electrochemical cell is maintained at 9-10.

[0045] Specifically, in step S3, the voltage of the alternating current is 30V to 36V, and the current density is 0.5A / cm 2 ~1A / cm 2 .

[0046] Specifically, in step S3, the sludge retention time is 6 hours to 10 hours.

[0047] Specifically, in step S3, the mud-water mixture in the electrochemical cell is stirred.

[0048] Specifically, during steps S2 to S4, the electrochemical cell is aerated at an aeration intensity of 3 m 3 / m 2 h~20m 3 / m 2 h.

[0049] Specifically, in step S3, the heat generated by the electrochemical cell reaction is collected.

[0050] In this embodiment, under this reaction condition, the obtained liquid carbon source COD=12300mg / L, BOD5=6155mg / L, biodegradability BOD5 / COD=0.5, which is comparable to the commercial carbon source sodium acetate (commercial carbon source sodium acetate biodegradability BOD5 / COD=0.5). Ammonia nitrogen=56mg / L, total nitrogen=339mg / L, total phosphorus=22mg / L, COD:TN=36, COD:TP=559, NH4+-N:TN=17, the mass fraction of total nitrogen accounts for 2.7%, and the mass fraction of total phosphorus accounts for 0.2%. The COD:TN of the general untreated influent is 4, COD:TP=50, so the sludge cracking liquid can be put into the denitrification stage to effectively improve the carbon-nitrogen ratio of the sewage, which is beneficial to the denitrification of the sewage by denitrifying bacteria, and at the same time will not introduce a large amount of nitrogen and phosphorus elements to affect the effluent water quality.

[0051] Embodiment 2:

[0052] like Figure 2 As shown, this embodiment provides a device for realizing the above-mentioned electrochemical enhanced sludge lysis method, including a tank body 1, an electrode 2, an agitator 3, a dosing pump 4, a sludge hopper 5, an air flotation machine 7 and an aerator 8, wherein the electrode 2 is arranged in the tank body 1, the agitator 3 is arranged in the tank body 1 and is located below the electrode 2, one side of the tank body 1 is connected to a sludge inlet pipe 11, and the other side of the tank body 1 is connected to a return pipe 12, the dosing pump 4 is connected to the tank body 1, the aerator 8 is connected to the tank body 1, the output end of the air flotation machine 7 is connected to the bottom of the tank body 1, an overflow port 13 is provided on one side of the top of the tank body 1, the sludge hopper 5 is arranged on one side of the tank body 1 and the top of the sludge hopper 5 is connected to the overflow port 13.

[0053] In this embodiment, the electrodes 2 are titanium-based ruthenium-iridium electrodes, and the number is 10 to 20 pairs.

[0054] In this embodiment, if Figure 2 , 4 As shown, the residual sludge in the sedimentation tank enters the tank body 1 through the sludge inlet pipe 11, and an alkaline solution is added to the mud-water mixture in the tank body 1 through the dosing pump 4, and the dosing pump 4 can monitor the pH value in the tank body 1 in real time to realize dynamic adjustment of the pH value in the tank body 1. Alternating current is passed through the electrode 2 to the mud-water mixture in the tank body 1, so that the sludge breaks the wall in the tank body 1 and releases nutrients. The liquid phase subsequently produced flows into the anoxic section and the anaerobic section of the biochemical tank through the reflux pipe 12 to supplement the carbon source for denitrification and anaerobic phosphorus release, thereby improving the denitrification effect of microorganisms and ensuring the effluent water quality. The flotation machine 7 can pass air into the tank body 1 in the form of tiny bubbles, so that the tiny bubbles adhere to the sludge floating on the surface to form a water-air-sludge three-phase mixed system. After the sludge adheres to the bubbles, its density is less than that of water, and it floats to the water surface, forming a scum layer that is separated through the overflow port 13 and enters the sludge hopper 5. The sludge is subjected to static compression sedimentation and finally dried.

[0055] In this embodiment, the aerator 8 can provide appropriate oxygen during the electrochemical reaction process. Appropriate oxygen can increase the electrochemical reaction rate and play a stirring role to prevent residual sludge from settling, so that the mud-water mixture remains homogeneous during the reaction process, and the sludge cell wall is broken more thoroughly. It can also remove part of the sludge attached to the electrode 2, and at the same time prevent anaerobic reactions from occurring in the pool to produce substances and foul-smelling gases that are not conducive to the reaction.

[0056] Embodiment 3:

[0057] This embodiment is similar to Embodiment 2, except that, in this embodiment, Figure 2 As shown, a heat exchanger 6 is also included. The side wall of the pool body 1 is made of a heat-conducting material, and the heat exchanger 6 is attached to the side wall of the pool body 1 .

[0058] In this embodiment, since the alkaline electrochemical reaction generates a large amount of heat, the heat exchanger 6 can collect the heat and reuse it in processes that require heat, such as sludge drying, to play the role of energy circulation and improve energy utilization efficiency.

[0059] Heat exchanger 6,

[0060] Embodiment 4:

[0061] This embodiment is similar to Embodiment 2, except that, in this embodiment, Figure 3As shown, in this embodiment, a cleaning component 9 is also provided on the top of the pool body 1, and the cleaning component 9 is used to clean the sludge attached to the electrode 2. The cleaning component 9 includes a telescopic cylinder 91, a cross bar 92, a connecting rod 93 and a soft scraper 94. The telescopic cylinder 91 is provided on the top of the pool body 1, and the telescopic end of the telescopic cylinder 91 performs telescopic movement in the vertical direction, and the telescopic end is vertically connected to the cross bar 92. The tops of multiple connecting rods 93 are vertically connected to the cross bar 92 in turn, and each connecting rod 93 corresponds to the position of each electrode 2 respectively. The bottom of the connecting rod 93 is connected to the soft scraper 94, and the soft scraper 94 is an insulating material. The soft scraper 94 abuts against the electrode 2. After the telescopic cylinder 91 is started, the telescopic end drives the connecting rod 93 on the cross bar 92 to move up and down, so that the soft scraper 94 slides back and forth on the surface of the electrode 2, thereby scraping off the sludge on the surface of the electrode 2.

[0062] In this embodiment, a MLSS detection probe for detecting sludge concentration is also provided near the electrode 2 in the tank body 1. The MLSS detection probe is linked to the cleaning component 9. When the MLSS detection probe detects an increase in sludge concentration, the cleaning component 9 starts working.

[0063] Although the embodiments of the present invention have been shown and described above, it is to be understood that the above embodiments are exemplary and are not to be construed as limitations of the present invention. A person skilled in the art may change, modify, replace and vary the above embodiments within the scope of the present invention.

[0064] Obviously, the above embodiments of the present invention are only examples for clearly illustrating the present invention, and are not intended to limit the embodiments of the present invention. For those skilled in the art, other different forms of changes or modifications can be made based on the above description. It is not necessary and impossible to list all the embodiments here. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention should be included in the protection scope of the claims of the present invention.

Claims

1. An electrochemical enhanced sludge pyrolysis method, characterized in that: Used in a sewage treatment system, the system comprises a biochemical tank and a sedimentation tank, the biochemical tank is connected to the sedimentation tank, and the sedimentation tank is provided with a sludge outlet; The method comprises the following steps: S1: extracting the remaining sludge in the sedimentation tank into the electrochemical cell through the sludge port; S2: adding an alkaline solution into the electrochemical cell, monitoring the pH value in the electrochemical cell in real time and maintaining the mud-water mixture in the electrochemical cell to be alkaline; S3: passing alternating current into the electrochemical cell, and monitoring the reaction degree of the sludge in the electrochemical cell in real time; S4: When the sludge is broken by reaction in the electrochemical cell and nutrients are released, the supernatant of the broken sludge is transported to the biochemical cell, and the sludge in the electrochemical cell is collected and dried.

2. The electrochemical enhanced sludge lysis method according to claim 1, characterized in that: In step S1, the sludge accounts for 85% to 95% of the volume of the electrochemical cell.

3. The electrochemical enhanced sludge lysis method according to claim 1, characterized in that: In step S2, the alkaline solution is a sodium hydroxide solution or a potassium hydroxide solution with a concentration of 0.5 mol / L to 3 mol / L.

4. The electrochemical enhanced sludge lysis method according to claim 3, characterized in that: In step S2, the alkaline solution is added and the pH value in the electrochemical cell is maintained at 9-10.

5. The electrochemical enhanced sludge lysis method according to claim 1, characterized in that: In step S3, the voltage of the AC power is 30V to 36V, and the current density is 0.5A / cm 2 ~1A / cm 2 .

6. The electrochemical enhanced sludge lysis method according to claim 5, characterized in that: In step S3, the sludge retention time is 6 hours to 10 hours.

7. The electrochemical enhanced sludge lysis method according to claim 1, characterized in that: In step S3, the mud-water mixture in the electrochemical cell is stirred.

8. The electrochemical enhanced sludge lysis method according to claim 1, characterized in that: During steps S2 to S4, the electrochemical cell is aerated at an intensity of 3 m 3 / m 2 h~20m 3 / m 2 h.

9. The electrochemical enhanced sludge lysis method according to claim 1, characterized in that: In step S3, the heat generated by the electrochemical cell reaction is collected.

10. A device for implementing the electrochemical enhanced sludge lysis method according to any one of claims 1 to 9, characterized in that: The invention comprises a tank body (1), an electrode (2), an agitator (3), a dosing pump (4), a sludge bucket (5), a heat exchanger (6), an air flotation machine (7) and an aerator (8), wherein the electrode (2) is arranged in the tank body (1), the agitator (3) is arranged in the tank body (1) and is located below the electrode (2), the side wall of the tank body (1) is made of a heat-conducting material, the heat exchanger (6) is attached to the side wall of the tank body (1), and one side of the tank body (1) is connected to a A mud inlet pipe (11) is connected to the other side of the tank body (1) with a return pipe (12), the dosing pump (4) is connected to the tank body (1), the aerator (8) is connected to the tank body (1), the output end of the flotation machine (7) is connected to the bottom of the tank body (1), an overflow port (13) is provided on one side of the top of the tank body (1), and the mud slag hopper (5) is provided on one side of the tank body (1) and the top of the mud slag hopper (5) is connected to the overflow port (13).

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