Electrocoagulation air floatation and precipitation integrated device

Abstract

The application provides an electric flocculation air floatation and precipitation integrated device, belonging to the technical field of sewage treatment, comprising a dosing area, an electric flocculation air floatation area, an air floatation separation area, a precipitation area, a clear water area and a dissolved air system arrangement area; the dosing area is connected with the electric flocculation air floatation area; the upper part of the left side of the dosing area is provided with a water inlet; the electric flocculation air floatation area is connected with the air floatation separation area; the electric flocculation air floatation area is provided with a releaser; the air floatation separation area is connected with the clear water area; the upper part of the air floatation separation area is provided with a slag scraping device; one side of the air floatation separation area is provided with a slag collecting groove; the slag collecting groove is provided with a slag discharge port; the precipitation area is arranged below the air floatation separation area; the bottom of the precipitation area is provided with a sludge discharge port; the clear water area is connected with the dissolved air system arrangement area; the upper part of the right side of the clear water area is provided with a water outlet; the dissolved air system arrangement area is provided with a dissolved air tank; and the dissolved air tank is connected with the releaser. The device is simple in structure, good in wastewater treatment effect, and capable of quickly and effectively reducing pollutants such as SS, COD and ammonia nitrogen in wastewater.

Description

Technical Field

[0001] This invention relates to the field of wastewater treatment technology, and in particular to an integrated electrocoagulation-air flotation-sedimentation device. Background Technology

[0002] Industries such as printing and dyeing, papermaking, chemicals, and pesticides all generate wastewater with high salt content, high COD, high suspended solids, and excessive heavy metal ions during production. Due to their high salt content, high organic matter concentration, and very low biodegradability, this type of wastewater is difficult to treat using conventional biological and physicochemical treatment methods. Chemical flocculation is not only ineffective but also produces a large amount of chemical sludge.

[0003] Air flotation is a widely used water treatment process for various industrial wastewater and municipal sewage. Currently, it is commonly used to remove scum and oil from oily wastewater, such as in the treatment of oily wastewater from petrochemical and machinery manufacturing industries. It can also be used as a wastewater pretreatment method to remove colloids and other suspended substances that are difficult to remove by sedimentation, thereby improving the subsequent treatment performance of the wastewater.

[0004] Electrocoagulation is a competitive wastewater treatment process in recent years, and it can be used to treat domestic sewage, heavy metal wastewater, papermaking wastewater, and oily wastewater. However, existing electrocoagulation technologies have disadvantages such as easy caking, scaling, clogging, high power consumption, and low efficiency, which greatly limits their promotion and application.

[0005] Electrocatalytic oxidation utilizes the high potential and high catalytic activity of the anode material to directly degrade pollutants in water, or utilizes the generation of highly oxidizing intermediate products (hydroxyl radicals) on the electrode surface to degrade toxic and harmful substances in water. However, due to its high cost and operating expenses, electrocatalytic oxidation is not widely used in the field of water treatment.

[0006] Therefore, there is a need for a more effective treatment device for wastewater with high salinity, high COD, high suspended solids, and excessive heavy metal ions. Summary of the Invention

[0007] The purpose of this invention is to provide an integrated electrocoagulation-flotation-sedimentation device to solve the technical problems of poor wastewater treatment effect and low efficiency of existing electrocoagulation-sedimentation equipment. The integrated electrocoagulation-flotation-sedimentation device provided by this invention integrates electrochemistry, flotation, flocculation, and sedimentation, has a simple structure, and provides good wastewater treatment effect, rapidly and effectively reducing pollutants such as SS, COD, and ammonia nitrogen in wastewater.

[0008] To achieve the above objectives, the technical solution adopted by the present invention is as follows:

[0009] An integrated electrocoagulation-flotation-sedimentation device includes a dosing zone, an electrocoagulation-flotation zone, a flotation separation zone, a sedimentation zone, a clear water zone, and a dissolved air system layout zone. The dosing zone is connected to the electrocoagulation-flotation zone. An inlet is located at the upper left side of the dosing zone, through which wastewater enters the dosing zone. The electrocoagulation-flotation zone is connected to the flotation separation zone. A release device is installed in the electrocoagulation-flotation zone to release dissolved air water. The flotation separation zone is connected to the clear water zone. A scum scraper is installed above the flotation separation zone to collect scum. A scum collection trough with a scum discharge port is located on one side of the flotation separation zone to discharge scum. The sedimentation zone is located below the flotation separation zone. A sludge discharge port is located at the bottom of the sedimentation zone to discharge sludge. The clear water zone is connected to the dissolved air system layout zone. An outlet is located at the upper right side of the clear water zone. A dissolved air tank is installed in the dissolved air system layout zone, and the dissolved air tank is connected to the release device.

[0010] Furthermore, a mixer is installed in the dosing area, and a power control cabinet is installed at the top of the dosing area, with the power control cabinet located on one side of the mixer.

[0011] Furthermore, a partition is provided between the air flotation separation zone and the electrocoagulation air flotation zone. The upper part of the partition is inclined at an angle of 30°. The slag collection trough is located on the right side of the air flotation separation zone and below one end of the slag scraping device. The slope of the slag collection trough is set to 1-5%.

[0012] Furthermore, several sets of electrode plates are arranged between the releaser and the partition to generate flocs and microbubbles. An electrode plate support frame is arranged below the electrode plate set. Each set of electrode plates is equipped with several electrode plates, which are arranged in parallel and the spacing between each electrode plate is set to 1-10cm. The releaser is located between the dosing area and the electrode plate set, and the releaser is an octagonal releaser.

[0013] Furthermore, hexagonal honeycomb inclined tubes are inclined in the sedimentation zone, and several sludge collection hoppers are set at the bottom of the sedimentation zone. A water collection pipe is set between the hexagonal honeycomb inclined tubes and the sludge collection hoppers. Several holes are set at one end of the water collection pipe facing downwards, and the other end of the water collection pipe extends to the upper part of the clear water zone.

[0014] Furthermore, the angle of inclination of the hexagonal honeycomb inclined tube is set to 60°, and the diameter of the hexagonal honeycomb inclined tube is set to 35-80mm; several vertical pipes are provided inside the mud collection hopper, and several holes are provided on the downward part of the vertical pipes; mud discharge port is provided on the side of the mud collection hopper.

[0015] Furthermore, a level regulator is installed in the clear water zone and is located on the water collection pipe. A vent is provided at the bottom of the clear water zone, and a dissolved air water return port is provided on one side of the lower part of the clear water zone. The clear water zone is connected to the dissolved air tank in the dissolved air system layout area through the dissolved air water return port.

[0016] Furthermore, the liquid level regulator includes a handwheel, a fixed plate, a lead screw, and a pressure cap. The handwheel is positioned above the fixed plate and is arranged horizontally. The handwheel is connected to the pressure cap via the lead screw. The pressure cap is positioned at the inlet of the water collection pipe, and a protrusion is provided on the lower end face of the pressure cap.

[0017] Furthermore, a dissolved gas pump is installed between the dissolved gas water return port and the dissolved gas tank. The dissolved gas water return port and the dissolved gas pump are connected by a pipe, and one end of the dissolved gas tank is connected to the dissolved gas pump by a pipe.

[0018] Furthermore, the dissolved gas tank and the release device are connected by a pipeline, and an air compressor is installed at one end of the dissolved gas tank. The dissolved gas tank and the air compressor are connected by a hose.

[0019] The present invention, by adopting the above-described technical solution, has the following beneficial effects:

[0020] 1. In this invention, the release device in the electrocoagulation flotation zone adopts an octagonal release device, which can automatically avoid clogging, facilitate operation, reduce labor intensity, and overcome the trouble caused by other types of release devices being prone to clogging, resulting in the shutdown and emptying and cleaning of the flotation equipment. The flotation efficiency is increased by more than 100%. The released dissolved air water has a residence time of more than 5 minutes, ensuring that the solid-liquid separation is in the optimal state. The released dissolved air water diffuses downward and around at the same time, improving the uniformity of the water distribution from the release device and increasing the probability of microbubbles colliding and adhering to impurities in the water to be treated, thereby further improving the flotation water purification effect.

[0021] 2. This invention places the release device before the electrode plate assembly, which can effectively cut the bubbles released by the release device into smaller microbubbles under the action of the electrode plate assembly, increasing the interaction area between the bubbles and the wastewater. These microbubbles are charged on the surface, and the smaller the diameter of the bubble, the higher its surface potential. Therefore, they are more likely to be adsorbed onto the surface of other phases in the liquid, resulting in a superior adsorption effect on oil and suspended solids in wastewater, separating them from the liquid. It also has a good removal effect on COD, ammonia nitrogen, and TP, thereby reducing organic matter in the water, significantly improving water transparency, and improving water color.

[0022] 3. This invention includes a liquid level regulator in the clear water zone. Operators rotate a handwheel, which in turn rotates a lead screw, allowing the pressure cap to move up and down. The handwheel facilitates the rotation of the lead screw, improving its ease of operation and increasing the gap between the pressure cap and the water collection pipe, thus accelerating water flow. Rotating the regulator in the opposite direction brings the pressure cap closer to the water collection pipe, narrowing the water flow channel and controlling the outflow speed. This keeps the liquid level in the flotation tank stable, thereby improving the efficiency of scum removal.

[0023] 4. The integrated electrocoagulation, flotation and sedimentation device provided by this invention integrates electrochemistry, flotation, flocculation and sedimentation. Multiple sets of positive and negative electrodes are inserted into the wastewater. When energized, flocculants and some oxidants are generated on the anode. The oxidants can oxidize large organic molecules into small organic molecules, and the flocculants can coagulate suspended solids, organic matter and other harmful impurities in the wastewater. At the same time, bubbles are generated on the cathode, so that the flocculants of suspended solids and organic matter adhere to the bubbles and float to the surface for removal, thereby achieving a rapid and effective reduction in the concentration of SS, COD and ammonia nitrogen in the wastewater.

[0024] 5. The integrated electrocoagulation-air flotation-sedimentation device provided by this invention has a simple structure, good treatment effect, high treatment efficiency, and low operation and maintenance costs. It is applicable to domestic sewage, dyeing and printing wastewater, dye wastewater, chemical wastewater, hospital wastewater, leather wastewater, electroplating wastewater, high-concentration organic wastewater, oily wastewater, etc., and is suitable for widespread application. Attached Figure Description

[0025] Figure 1 This is a schematic diagram of the integrated electrocoagulation, air flotation, and sedimentation device of the present invention.

[0026] In the attached diagram, 1-dosing area, 11-mixer, 12-inlet, 2-electrocoagulation and flotation zone, 21-releaser, 22-electrode plate assembly, 23-electrode plate support frame, 24-electrode plate, 3-flotation separation zone, 31-partition plate, 4-sludge collection trough, 41-sludge discharge port, 5-sedimentation zone, 51-hexagonal honeycomb inclined tube, 52-sludge hopper, 53-sludge discharge port, 54-water collection pipe, 55-vertical pipe 56-hole, 6-clear water zone, 61-outlet, 62-level regulator, 63-dissolved gas water return port, 64-vent, 65-handwheel, 66-fixed plate, 67-screw rod, 68-pressure cap, 69-protrusion, 7-dissolved gas system layout area, 71-dissolved gas pump, 72-air compressor, 73-dissolved gas tank, 74-hose, 8-sludge scraper, 9-power control cabinet, 10-pipeline. Detailed Implementation

[0027] To make the objectives, technical solutions, and advantages of the present invention clearer, the present invention will be further described in detail below with reference to the accompanying drawings and preferred embodiments. However, it should be noted that many details listed in the specification are merely to provide the reader with a thorough understanding of one or more aspects of the present invention, and these aspects of the invention can be implemented even without these specific details.

[0028] Example 1

[0029] like Figure 1As shown, an integrated electrocoagulation-flotation-sedimentation device includes a dosing zone 1, an electrocoagulation-flotation zone 2, a flotation separation zone 3, a sedimentation zone 5, a clear water zone 6, and a dissolved air system layout zone 7. The dosing zone 1 is connected to the electrocoagulation-flotation zone 2, and an inlet 12 is provided at the upper left side of the dosing zone 1. The electrocoagulation-flotation zone 2 is connected to the flotation separation zone 3, and a release device 21 is provided inside the electrocoagulation-flotation zone 2. The flotation separation zone 3 is connected to the clear water zone 6, and a sludge scraping device 8 is provided above the flotation separation zone 3. A sludge collection tank 4 is provided on one side of the flotation separation zone 3, and a sludge discharge port 41 is provided in the sludge collection tank 4. The sedimentation zone 5 is located below the flotation separation zone 3, and a sludge discharge port 53 is provided at the bottom of the sedimentation zone 5. The clear water zone 6 is connected to the dissolved air system layout zone 7, and an outlet 61 is provided at the upper right side of the clear water zone 6. A dissolved air tank 73 is provided inside the dissolved air system layout zone 7, and the dissolved air tank 73 is connected to the release device 21. The integrated electrocoagulation-air flotation-sedimentation device provided by this invention has a simple structure, good treatment effect, high treatment efficiency, and low operation and maintenance costs. It is applicable to domestic sewage, dyeing and printing wastewater, dye wastewater, chemical wastewater, hospital wastewater, leather wastewater, electroplating wastewater, high-concentration organic wastewater, oily wastewater, etc., and is suitable for widespread use.

[0030] Example 2

[0031] like Figure 1As shown, a mixer 11 is installed in the dosing zone 1, and a power control cabinet 9 is installed at the top of the dosing zone 1, with the power control cabinet 9 located to one side of the mixer 11. Wastewater enters the dosing zone 1 and is thoroughly mixed with the added PAC or PAM reagents under the action of the mixer 11, and then enters the electrocoagulation and flotation zone 2. The power control cabinet 9 controls the start and stop of the equipment. Several sets of electrode plate groups 22 are arranged between the release device 21 and the partition 31. An electrode plate support frame 23 is arranged below the electrode plate group 22. Each set of electrode plate groups 22 is equipped with several electrode plates 24. The electrode plates 24 are arranged in parallel, and the spacing between each electrode plate 24 is set to 1-10cm. The electrode plates 24 are made of carbon steel, stainless steel, aluminum plate, etc. Under the action of electric field, the electrode plate group 22 has multiple functions such as demulsification, flocculation, oil removal, sterilization, decolorization, and surfactant removal for sewage. One or more sets of electrode plate groups 22 can be set up to operate in parallel. The spacing between each positive and negative electrode plate is 1-10cm. The release device 21 is set between the dosing area 1 and the electrode plate group 22. The release device 21 is an octagonal release device. The octagonal release device is made of carbon steel, stainless steel, or UPVC. After the wastewater mixed with the reagents enters the electrocoagulation flotation zone 2, the electrode plate 24 is connected to direct current. The electrode plate generates flocs and microbubbles through electrochemical action. Under the influence of the electric field, the electrode plate performs multiple functions on the wastewater, including demulsification, flocculation, oil removal, sterilization, decolorization, and surfactant removal. The flocs and microbubbles then enter the flotation separation zone 3 together. In this invention, the release device 21 in the electrocoagulation flotation zone is an octagonal release device, which automatically avoids clogging, facilitates operation, reduces labor intensity, and overcomes the trouble caused by other types of release devices that are prone to clogging, resulting in flotation equipment shutdowns and venting for cleaning. The flotation efficiency is increased by more than double. The released dissolved air water has a residence time of more than 5 minutes, ensuring that solid-liquid separation is at its optimal state. The released dissolved air water diffuses downwards and outwards simultaneously, improving the uniformity of the effluent distribution from the release device 21 and increasing the probability of microbubbles colliding and adhering to impurities in the water to be treated, thereby further improving the flotation purification efficiency. The release device 21 is positioned before the electrode plate assembly, effectively cutting the bubbles released by the release device 21 into smaller microbubbles under the action of the electrode plate assembly 22. This increases the interaction area between the bubbles and the wastewater. These microbubbles are charged on their surfaces, and the smaller the diameter of the bubbles, the higher their surface potential. Therefore, they are more easily adsorbed onto the surface of other phases in the liquid, resulting in superior adsorption effects on oil and suspended solids in the wastewater, separating them from the liquid. It also has good removal effects on COD, ammonia nitrogen, and TP, thereby reducing organic matter in the water, significantly improving water transparency, and improving water color. A partition 31 is provided between the air flotation separation zone 3 and the electrocoagulation air flotation zone 2. The upper part of the partition 31 is inclined at an angle of 30°. The sludge collection tank 4 is located on the right side of the air flotation separation zone 3 and below one end of the sludge scraping device 8. The sludge collection tank 4 has a certain slope, which is 1-5%.After the flocs and microbubbles enter the air flotation separation zone 3 at an inclined angle from the upper part of the baffle 31, they form scum on the liquid surface of the air flotation separation zone 3. The scum is collected into the scum collection tank 4 by the scum scraper 8 and discharged through the scum discharge port 41 of the scum collection tank 4. Hexagonal honeycomb inclined tubes 51 are inclined in the sedimentation zone 5. Several sludge collection hoppers 52 are set at the bottom of the sedimentation zone 5. A water collection pipe 54 is set between the hexagonal honeycomb inclined tubes 51 and the sludge collection hoppers 52. Several holes 56 are set on the downward part of one end of the water collection pipe 54 to improve the water collection efficiency. The other end of the water collection pipe 54 extends to the upper part of the clear water zone 6 and is connected to the clear water zone 6. The hexagonal honeycomb inclined tube 51 is tilted at an angle of 60°, with a diameter of 35-80mm. The material of the hexagonal honeycomb inclined tube 51 is polypropylene, polyvinyl chloride, or fiberglass. Several vertical pipes 55 are installed inside the sludge collection hopper 52, with several holes 56 on the downward-facing parts of the vertical pipes 55. A sludge discharge port 53 is located on the side of the sludge collection hopper 52. The clear water from the air flotation separation zone 3 flows downward through the water collection pipe 54 into the clear water zone 6. The sludge from the air flotation separation zone 3 flows downward into the sedimentation zone 5 and is discharged through the sludge discharge port 53 on the side of the sludge collection hopper 52. A level regulator 62 is installed in the clear water zone 6 and is located on the water collection pipe 54. A vent 64 is located at the bottom of the clear water zone 6, and a dissolved air water return port 63 is located on one side of the lower part of the clear water zone 6. The clear water zone 6 is connected to the dissolved air tank 73 in the dissolved air system arrangement area 7 through the dissolved air water return port 63. The liquid level regulator 62 includes a handwheel 65, a fixed plate 66, a lead screw 67, and a pressure cap 68. The handwheel 65 is positioned above the fixed plate 66 and is horizontally oriented. The handwheel 65 is connected to the pressure cap 68 via the lead screw 67. The pressure cap 68 is located at the inlet of the water collection pipe 54, and a protrusion 69 is provided on its lower end face. In this invention, a liquid level regulator 62 is installed in the clear water zone 6. When the operator rotates the handwheel 65, it drives the lead screw 67 to rotate, thus moving the pressure cap 68 up and down. The handwheel 65 facilitates the rotation of the lead screw 67, improving its ease of operation and increasing the gap between the pressure cap 68 and the water collection pipe 54, thereby accelerating the water outflow. Rotating the regulator in the opposite direction brings the pressure cap 68 closer to the water collection pipe 54, narrowing the water flow channel and controlling the water outflow speed. This keeps the liquid level in the flotation tank stable, thereby improving the efficiency of scum removal. A dissolved air pump 71 is installed between the dissolved air water return port 63 and the dissolved air tank 73. The dissolved air water return port 63 and the dissolved air pump 71 are connected by a pipe 10. One end of the dissolved air tank 73 is connected to the dissolved air pump 71 by a pipe 10. The dissolved air tank 73 is connected to the release device 21 by a pipe 10. An air compressor 72 is installed at one end of the dissolved air tank 73. The dissolved air tank 73 and the air compressor 72 are connected by a hose 74.The integrated electrocoagulation, flotation, and sedimentation device provided by this invention combines electrochemistry, flotation, flocculation, and sedimentation. Multiple sets of positive and negative electrodes are inserted into the wastewater. When energized, flocculants and oxidants are generated on the anode. The oxidants can oxidize large organic molecules into small organic molecules, while the flocculants can coagulate suspended solids, organic matter, and other harmful impurities in the wastewater. At the same time, bubbles are generated on the cathode, causing the flocculants of suspended solids and organic matter to adhere to the bubbles and float to the surface for removal, thereby achieving a rapid and effective reduction in the concentration of SS, COD, and ammonia nitrogen in the wastewater.

[0032] Working principle

[0033] Wastewater first enters the dosing zone 1 through inlet 12, where PAC or PAM agents are added. Under the action of mixer 11, the wastewater is fully mixed with the chemicals and then enters the electrocoagulation and flotation zone 2. Electrode plate assembly 22 is connected to DC power, and electrode plate 24 generates flocs and microbubbles through electrochemical action. These flocs and microbubbles enter the flotation separation zone 3 and form scum on the liquid surface. The scum is collected in the scum collection tank 4 by the scum scraper 8 and discharged from the equipment through the scum discharge port 41 of the scum collection tank 4. Meanwhile, the clear water in the flotation separation zone 3 flows downward through the water collection pipe 54 to the clear water zone 6 and is discharged from the equipment through the water outlet 61 of the clear water zone 6. The sludge in the flotation separation zone 3 enters the sedimentation zone 5 and is collected by the sludge collection hopper 52 of the sedimentation zone 5, and then discharged from the sludge discharge port 53 on the side of the sludge collection hopper 52.

[0034] The above description is only a preferred embodiment of the present invention. It should be noted that for those skilled in the art, several improvements and modifications can be made without departing from the principle of the present invention, and these improvements and modifications should also be considered within the scope of protection of the present invention.

Claims

1. An integrated electrocoagulation-air flotation-sedimentation device, characterized in that: The system includes a dosing zone (1), an electrocoagulation and flotation zone (2), a flotation separation zone (3), a sedimentation zone (5), a clear water zone (6), and a dissolved air system layout zone (7). The dosing zone (1) is connected to the electrocoagulation and flotation zone (2). An inlet (12) is provided on the upper left side of the dosing zone (1), and wastewater enters the dosing zone (1) from the inlet (12). The electrocoagulation and flotation zone (2) is connected to the flotation separation zone (3). A release system is provided in the electrocoagulation and flotation zone (2). The apparatus (21) is used to release dissolved air water. The flotation separation zone (3) is connected to the clear water zone (6). A scum scraper (8) is installed above the flotation separation zone (3) to collect scum. A scum collection trough (4) is installed on one side of the flotation separation zone (3). The scum collection trough (4) is equipped with a scum discharge port (41) to discharge the scum. The sedimentation zone (5) is located below the flotation separation zone (3). A sludge discharge port (53) is installed at the bottom of the sedimentation zone (5) to discharge scum. The sludge is discharged, the clear water zone (6) is connected to the dissolved air system layout zone (7), the upper right side of the clear water zone (6) is provided with an outlet (61), the dissolved air system layout zone (7) is provided with a dissolved air tank (73), and the dissolved air tank (73) is connected to the release device (21). The liquid level regulator (62) includes a handwheel (65), a fixed plate (66), a lead screw (67), and a pressure cap (68). The handwheel (65) is located above the fixed plate (66) and is used to rotate the lead screw (67). The handwheel (65) is arranged in a horizontal direction. The handwheel (65) and the pressure cap (68) are connected by the lead screw (67). The pressure cap (68) is located at the opening of the water collection pipe (54). The lower end face of the pressure cap (68) is provided with a protrusion (69). The release device (21) adopts an octagonal release device.

2. The integrated electrocoagulation-flotation-sedimentation device according to claim 1, characterized in that: A mixer (11) is installed in the dosing area (1), and a power control cabinet (9) is installed at the top of the dosing area (1), and the power control cabinet (9) is located on one side of the mixer (11).

3. The integrated electrocoagulation-flotation-sedimentation device according to claim 1, characterized in that: A partition (31) is provided between the air flotation separation zone (3) and the electrocoagulation air flotation zone (2). The upper part of the partition (31) is inclined and the angle of inclination is set to 30°. The slag collection tank (4) is located on the right side of the air flotation separation zone (3) and is located below one end of the slag scraping device (8). The slope of the slag collection tank (4) is set to 1-5%.

4. The integrated electrocoagulation-flotation-sedimentation device according to claim 1, characterized in that: Several sets of electrode plate groups (22) are arranged between the releaser (21) and the partition (31) for generating flocs and microbubbles. An electrode plate support frame (23) is arranged below the electrode plate group (22). Each set of electrode plate group (22) is provided with several electrode plates (24). The electrode plates (24) are arranged in parallel, and the spacing between each electrode plate (24) is set to 1-10cm. The releaser (21) is located between the drug addition area (1) and the electrode plate group (22).

5. The integrated electrocoagulation-flotation-sedimentation device according to claim 1, characterized in that: A hexagonal honeycomb inclined tube (51) is inclined in the sedimentation zone (5). Several sludge collection hoppers (52) are provided at the bottom of the sedimentation zone (5). A water collection pipe (54) is provided between the hexagonal honeycomb inclined tube (51) and the sludge collection hoppers (52). Several holes (56) are provided on one end of the water collection pipe (54) facing downwards. The other end of the water collection pipe (54) extends to the upper part of the clear water zone (6).

6. The integrated electrocoagulation-flotation-sedimentation device according to claim 5, characterized in that: The angle of inclination of the hexagonal honeycomb inclined tube (51) is set to 60°, and the diameter of the hexagonal honeycomb inclined tube (51) is set to 35-80mm; several vertical pipes (55) are provided in the mud collection hopper (52), and several holes (56) are provided on the downward part of the vertical pipes (55). A mud discharge port (53) is provided on the side of the mud collection hopper (52).

7. The integrated electrocoagulation-flotation-sedimentation device according to claim 1, characterized in that: A level regulator (62) is installed in the clear water zone (6), and the level regulator (62) is installed on the water collection pipe (54). A vent (64) is installed at the bottom of the clear water zone (6). A dissolved air water return port (63) is installed on one side of the lower part of the clear water zone (6). The clear water zone (6) is connected to the dissolved air tank (73) of the dissolved air system arrangement area (7) through the dissolved air water return port (63).

8. The integrated electrocoagulation-air flotation-sedimentation device according to claim 1, characterized in that: A dissolved gas pump (71) is installed between the dissolved gas water return port (63) and the dissolved gas tank (73). The dissolved gas water return port (63) and the dissolved gas pump (71) are connected through a pipe (10). One end of the dissolved gas tank (73) is connected to the dissolved gas pump (71) through a pipe (10).

9. The integrated electrocoagulation-air flotation-sedimentation device according to claim 1, characterized in that: The dissolved gas tank (73) and the release device (21) are connected by a pipe (10). An air compressor (72) is installed at one end of the dissolved gas tank (73). The dissolved gas tank (73) and the air compressor (72) are connected by a hose (74).

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