CN218345241U

CN218345241U - Electric flocculation air flotation machine

Info

Publication number: CN218345241U
Application number: CN202222785143.0U
Authority: CN
Inventors: 陈蔚萍; 王彩良
Original assignee: Xinjiang Greenos Environmental Protection Technology Co ltd
Current assignee: Xinjiang Greenos Environmental Protection Technology Co ltd
Priority date: 2022-10-22
Filing date: 2022-10-22
Publication date: 2023-01-20
Anticipated expiration: 2032-10-22

Abstract

The utility model relates to a water treatment technical field specifically is an electric flocculation air supporting machine, including the equipment casing, the electric flocculation device, scrape the sediment device, dissolve gas air supporting device and ultrasonic wave generating device, dissolve gas air supporting device including dissolving the gas pitcher, with dissolve the microbubble generator that the gas pitcher passes through the pipe connection, water pump and air compressor machine, can burst into the diameter for the bubble of micron order from the microbubble that microbubble generator escaped through ultrasonic wave generating device, these bubbles easily combine together with the flocculation thing in the sewage, make the flocculation thing that suspends in sewage can be quick float on the upper surface of water, it is more thorough to flocculation thing processing in sewage, ultrasonic wave generating device makes the flocculation thing in the sewage smash fast, disintegrate, the comprehensive density of after smashing flocculation thing and microbubble are attached to is littleer, can be faster to come up to the surface of water, ultrasonic wave generating device can prevent to cause the short circuit on the flocculation thing electrode among the electric flocculation device electrolysis process.

Description

Electric flocculation air flotation machine

Technical Field

The utility model relates to the technical field of water treatment, in particular to an electric flocculation air flotation machine.

Background

A large amount of sewage is generated in industrial production and daily life, the sewage generally contains jelly and solid suspended matters, and the electric flocculation air floatation equipment coagulates the jelly and the solid suspended matters in the sewage into flocs through electrode electrolysis, and then the flocs suspended in the sewage float on the upper water surface through combination of air bubbles and the flocs in the sewage. The electric flocculation air flotation equipment of prior art includes electrode and aeration equipment usually, and aeration equipment is aeration in to sewage, and the bubble of production is great, and great bubble is difficult for adsorbing the flocculation thing in the sewage for the difficult come-up of flocculation thing of suspension in the sewage to the surface of water, lead to the not thorough enough of flocculation thing processing in the sewage, gather the flocculation thing of suspension in the sewage in addition and glue easily and cause the short circuit on the electrode, and consequently prior art's electric flocculation air flotation equipment is relatively poor to the treatment effect of sewage.

SUMMERY OF THE UTILITY MODEL

The utility model aims to solve the problems and provide an electric flocculation air flotation machine with better sewage treatment effect.

In order to achieve the above purpose, the utility model adopts the technical scheme that: an electrocoagulation-floatation machine comprises an equipment shell, an electrocoagulation device, a slag scraping device, a dissolved air floatation device and an ultrasonic generation device, wherein the equipment shell is internally provided with an electrocoagulation-floatation tank and a slag collecting-sedimentation tank, the electrocoagulation device comprises an electrode arranged in the electrocoagulation-floatation tank, the ultrasonic generation device is arranged in the electrocoagulation-floatation tank, the dissolved air floatation device comprises a dissolved air tank, a micro bubble generator connected with the dissolved air tank through a pipeline, a water pump and an air compressor, and the micro bubble generator is arranged in the electrocoagulation-floatation tank.

Preferably, the left side of the equipment shell is provided with a water inlet communicated with the electric flocculation-air floatation tank, the right side of the equipment shell is provided with a water outlet and a slag outlet communicated with the slag collecting-settling tank, the top of the equipment shell is provided with a slag scraping device above the electric flocculation-air floatation tank and the slag collecting-settling tank, and the top of the right side of the slag collecting-settling tank, close to the slag scraping device, is provided with a slag collecting groove communicated with the slag outlet.

Preferably, the slag scraping device comprises two bearing seats arranged at the top of the equipment shell, a chain wheel arranged on the bearing seats, a transmission hinge sleeved on the chain wheel and a scraper plate arranged on the transmission hinge.

Preferably, the electrode comprises a plurality of cathode electrodes and anode electrodes which are arranged in a staggered manner and fixed by an electrode fixing frame, the anode electrode is made of iron, and the cathode electrode is made of graphite.

Preferably, the microbubble generator includes barrel, waterproof ventilated membrane, hard otter board and soft otter board, and a plurality of side openings have been seted up to the barrel lateral wall, and every side opening department all is equipped with the waterproof ventilated membrane of one deck, two-layer hard otter board and one deck soft otter board, and two-layer hard otter board is laminated in waterproof ventilated membrane both sides, the sieve mesh dislocation set of the hard otter board of waterproof ventilated membrane both sides.

Preferably, the top of the dissolved air tank is communicated with the slag collecting-settling tank through a backflow water pipeline, the water pump is arranged on the backflow water pipeline, one side of the bottom of the dissolved air tank is connected with the air compressor through a pipeline, and the other side of the bottom of the dissolved air tank is communicated with the cylinder through a water inlet pipeline extending into the electrocoagulation-air flotation tank.

Preferably, the inner wall of the upper end of the cylinder body is connected with a piston in a sealing and sliding manner, the piston can slide up and down in the cylinder body, and a limit switch is arranged at an opening at the upper end of the cylinder body.

Preferably, the slag collecting-settling tank is internally provided with a first-stage sedimentation inclined pipe and a second-stage sedimentation inclined pipe arranged above the first-stage sedimentation inclined pipe, the bottom of the slag collecting-settling tank is provided with a conical hopper, the first-stage sedimentation inclined pipe and the horizontal direction form an included angle of 60 degrees, and the second-stage sedimentation inclined pipe and the first-stage sedimentation inclined pipe form an included angle of 120 degrees.

The utility model realizes the high-efficiency purification treatment of sewage through the coordination of the electric flocculation device, the dissolved air floatation device and the ultrasonic wave generating device, enables suspended impurities in the sewage to interact to generate flocculate through the electric flocculation device, and can reduce COD, BOD5, ammonia nitrogen and other components in the sewage to a certain extent; can explode the microbubble that escapes from microbubble generator through ultrasonic wave generating device and open into the bubble that the diameter is the micron order, these bubbles easily combine together with the flocculation thing in the sewage for the flocculation thing of suspension in sewage can be quick float on the upper water surface, and is handled more thoroughly to flocculation thing in the sewage. In addition, the ultrasonic wave generating device generates high-frequency vibration to drive the flocculate suspended in the sewage to vibrate rapidly, so that the flocculate is crushed and disintegrated rapidly, the comprehensive density of the disintegrated and crushed flocculate and the attached micro-bubbles is lower, and the flocculate can float upwards to the water surface more rapidly. In addition, the ultrasonic generator generates high-frequency vibration to drive the suspended flocculate in the sewage to vibrate rapidly, so that the flocculate is prevented from being stuck on the electrode to cause short circuit in the electrolytic process of the electric flocculation device.

Drawings

The present invention will be further explained with reference to the drawings and examples.

FIG. 1 is a schematic structural view of an electroflocculation air flotation machine according to the preferred embodiment of the present invention;

fig. 2 is a schematic structural diagram of the microbubble generator in fig. 1;

fig. 3 is a partially enlarged schematic view of the microbubble generator in fig. 2;

in the figure: 10. an equipment housing; 11. an electric flocculation-air flotation tank; 12. a slag collection-sedimentation tank; 121. a slag collection groove; 13. a water inlet; 14. a water outlet; 15. a partition plate; 16. a slag outlet; 20. an electrocoagulation device; 21. an electrode; 22. an electrode holder; 31. a dissolved air tank; 311. a water inlet pipeline; 312. an electromagnetic valve; 313. a return water conduit; 32. a microbubble generator; 321. a barrel; 322. a waterproof breathable film; 323. a hard mesh plate; 324. a soft screen plate; 325. side holes; 326. a piston; 327. a limit switch; 33. a water pump; 34. an air compressor; 40. a slag scraping device; 41. a bearing seat; 42. a transmission hinge; 43. a sprocket; 44. a squeegee; 50. an ultrasonic wave generating device; 61. a first-stage sedimentation inclined tube; 62. a secondary sedimentation inclined tube; 63. a conical hopper.

Detailed Description

The invention will now be described in further detail with reference to the accompanying drawings, which are simplified schematic drawings and illustrate, by way of illustration only, the basic structure of the invention, and which therefore show only the constituents relevant to the invention.

In the description of the present invention, it is to be understood that the terms "center", "longitudinal", "lateral", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc. indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, and are only for convenience of description and simplicity of description, but do not indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore, are not to be construed as limiting the present invention. Furthermore, the terms "first," "second," and the like are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or to implicitly indicate a number of the indicated technical features. Thus, a feature defined as "first," "second," etc. may explicitly or implicitly include one or more of that feature. In the description of the present invention, "a plurality" means two or more unless otherwise specified.

In the description of the present invention, it is to be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meaning of the above terms in the present invention can be understood by those of ordinary skill in the art through specific situations.

As shown in fig. 1, fig. 2 and fig. 3, an electric flocculation air flotation machine provided by a preferred embodiment of the present invention includes an apparatus housing 10, an electric flocculation apparatus 20, a dissolved air flotation apparatus, a slag scraping apparatus 40 and an ultrasonic generating apparatus 50.

An electric flocculation-air flotation tank 11 and a slag collecting-settling tank 12 are arranged in the equipment shell 10, and a partition plate 15 is arranged between the electric flocculation-air flotation tank 11 and the slag collecting-settling tank 12; a water inlet 13 communicated with the electrocoagulation-floatation tank 11 is arranged at the left side of the equipment shell 10, and sewage to be treated firstly enters the electrocoagulation-floatation tank 11 through the water inlet 13; the right side of the equipment shell 10 is provided with a water outlet 14 and a slag outlet 16 which are communicated with the slag collecting-settling tank 12, the treated sewage flows out through the water outlet 14, the water outlet 14 can be connected with a valve and a water pump so as to pump out water, and scum in the slag collecting-settling tank 12 is discharged through the slag outlet 16.

The top of the equipment shell 10 is provided with a slag scraping device 40 above the electric flocculation-air flotation tank 11 and the slag collecting-settling tank 12, the top of the right side of the slag collecting-settling tank 12 close to the slag scraping device 40 is provided with a slag collecting groove 121 communicated with the slag outlet 16, the slag scraping device 40 comprises two bearing seats 41 arranged at the top of the equipment shell 10, a chain wheel 43 arranged on the bearing seats 41, a transmission hinge 42 sleeved on the chain wheel 43 and a scraping plate 44 arranged on the transmission hinge 42, the chain wheel 43 and the transmission hinge 42 are driven to rotate by a driving motor, and scum containing floating flocculates is scraped to the slag collecting groove 121 through the scraping plate 44 of the slag scraping device 40.

The electric flocculation apparatus 20 includes an electrode 21 disposed in the electric flocculation-air flotation tank 11, and the electrode 21 includes a plurality of cathode electrodes and anode electrodes alternately disposed and fixed by an electrode fixing frame 22, and is used for electrolyzing sewage. The electrode 21 may be made of different materials according to the material to be removed, and the material for the anode electrode may be iron or aluminum, and the material for the cathode electrode may be graphite.

Ultrasonic generator 50 locates in electric flocculation-air supporting pond 11, and ultrasonic generator 50 produces high frequency vibration and drives the flocculation thing of suspension in the sewage quick vibration, makes flocculation thing smash fast, disintegrates, and the integrated density after disintegration, the flocculation thing after smashing and the microbubble are attached to is littleer, can be faster to the come-up to the surface of water. In addition, the ultrasonic generator 50 generates high frequency vibration to drive the suspended flocculate in the sewage to vibrate rapidly, so that the flocculate can be prevented from being adhered to the electrode to cause short circuit in the electrolytic process.

The dissolved air flotation device comprises a dissolved air tank 31, a micro-bubble generator 32, a water pump 33 and an air compressor 34. The microbubble generator 32 is arranged in the electrocoagulation-air flotation tank 11, the microbubble generator 32 is used for providing microbubbles to the electrocoagulation-air flotation tank 11 to enable flocs in sewage in the electrocoagulation-air flotation tank 11 to float, the microbubble generator 32 comprises a cylinder 321, a waterproof breathable film 322, a hard mesh plate 323 and a soft mesh plate 324, a plurality of side holes 325 are formed in the side wall of the cylinder 321, a layer of waterproof breathable film 322, two layers of hard mesh plates 323 and a layer of soft mesh plate 324 are arranged at each side hole 325, and in the embodiment, the waterproof breathable film 322, the hard mesh plate 323 and the soft mesh plate 324 are glued and fixed at the edges of the side holes 325. The two layers of hard mesh plates 323 are attached to two sides of the waterproof breathable film 322, the mesh holes of the hard mesh plates 323 on two sides of the waterproof breathable film 322 are arranged in a staggered mode, the size of the mesh holes of the hard mesh plates 323 is 20-16 meshes, the diameter of a single escaping bubble is about 1mm, and the smaller bubble is convenient for the soft mesh plates 324 to crush the hard mesh plates into smaller micro bubbles in the later period; the sieve pore size of the soft net plate 324 is 20-16 meshes, the soft net plate 324 is made of nylon net and is tightly glued in the side hole 325.

The dissolved air tank 31 is a closed pressurized container, and has the function of realizing full contact mass transfer of water and air in the dissolved air tank 31 under certain pressure (generally 0.2-0.6 MPa), so that the air is dissolved in the sewage to reach the saturation degree. The water and the air are fully mixed under certain pressure through the dissolved air tank 31, the sewage dissolved with the air is introduced into the microbubble generator 32, the top of the dissolved air tank 31 is communicated with the slag collecting-settling tank 12 through a return water pipeline 313, a water pump 33 is arranged on the return water pipeline 313, the sewage in the slag collecting-settling tank 12 is pumped into the dissolved air tank 31 through the water pump 33, the return water pipeline 313 can be placed into a water tank containing tap water in advance, and the tap water is pumped into the dissolved air tank 31 through the water pump 33; one side of the bottom of the dissolved air tank 31 is connected with an air compressor 34 through a pipeline, so that compressed air can be provided conveniently. The other side of the bottom of the dissolved air tank 31 is communicated with the barrel 321 through a water inlet pipeline 311 extending into the electric flocculation-air flotation tank 11, sewage dissolved with air flows into the barrel 321 along the water inlet pipeline 311, and the water inlet pipeline 311 is provided with an electromagnetic valve 312.

Preferably, the piston 326 is connected to the inner wall of the upper end of the cylinder 321 in a sealing and sliding manner, the piston 326 can slide up and down in the cylinder 321, when the gas in the water in the cylinder 321 escapes outwards through the side hole 325, the pressure in the cylinder 321 is reduced, and at this time, the piston 326 slides downwards along the inner wall of the cylinder 321; when the pressure in the cylinder 321 increases, the piston 326 slides upward along the inner wall of the cylinder 321.

Furthermore, a limit switch 327 is disposed at an opening at the upper end of the cylinder 321, when the pressure in the cylinder 321 increases and the piston 326 slides upwards along the inner wall of the cylinder 321 to contact the limit switch 327, the electromagnetic valve 312 on the water inlet pipe 311 is closed, and the dissolved air tank 31 stops filling water into the cylinder 321.

Preferably, a first-stage inclined sedimentation pipe 61 and a second-stage inclined sedimentation pipe 62 arranged above the first-stage inclined sedimentation pipe 61 are arranged in the sludge collection-sedimentation tank 12, a conical hopper 63 is arranged at the bottom of the sludge collection-sedimentation tank 12, and flocculate in the sewage is removed through the first-stage inclined sedimentation pipe 61 and the second-stage inclined sedimentation pipe 62. In this embodiment, the inclined tube 61 is precipitated to the one-level and the inclined tube 62 is precipitated to the second grade adopts the ethylene-propylene copolymerization or polyvinyl chloride honeycomb inclined tube, the inclined tube 61 is precipitated to the one-level and is 60 degrees settings with the horizontal direction, the inclined tube 62 is precipitated to the second grade and is 120 degrees settings with the one-level inclined tube 61, the length that the inclined tube 61 is precipitated to the one-level and the inclined tube 62 is 1m to the second grade, the inside pipe diameter that the inclined tube 62 was precipitated to the second grade is less than the inside pipe diameter that the inclined tube 61 was precipitated to the one-level, this kind of structure greatly increased the dwell time of water, make the small particle collision probability increase, can deposit after becoming the large granule rapidly, the turbidity clearance of going out water has been improved greatly. Specifically, the inner diameter of the first-stage inclined sedimentation pipe 61 is 35-50mm, and the inner diameter of the second-stage inclined sedimentation pipe 62 is 20-30mm. The inner diameter of the pipe can be changed according to the water quality to achieve the best sedimentation effect, so that flocculates and condensate in the sewage are accumulated into Bao Niceng, then the sludge is settled into the conical hopper 63, the sludge sediment in the conical hopper 63 is collected to the bottom and is periodically discharged, and the sludge is conveniently discharged to clean the slag collecting-sedimentation tank 12.

When the utility model is used, the external sewage to be treated enters the electric flocculation-air floatation tank 11 from the water inlet 13, the electric flocculation device 20 and the dissolved air floatation device are started, the electric flocculation device 20 electrolyzes the sewage, trivalent aluminum ions or divalent iron ions which are dissolved on the anode electrode and transferred into the sewage are hydrolyzed to become effective flocculating agents of dispersing impurities in the electrolytic process, and the trivalent aluminum ions (or divalent iron ions) and the hydrolytic polymerization products thereof interact with suspended impurities to generate flocculation; all in oneThe water molecules are ionized to generate H ⁺ And OH ^- Under the drive of an electric field, H ⁺ 、OH ^- The water surface floating slag is transferred to the cathode electrode and the anode electrode respectively, hydrogen bubbles and oxygen bubbles are separated out on the surfaces of the cathode electrode and the anode electrode respectively, and the bubbles adsorb flocculates in the sewage and carry the flocculates out of the water surface when rising, so that a scum layer is formed on the water surface. OH group ^- The loss of electrons at the anode electrode can also generate intermediate active substances with strong oxidizing property, and the intermediate active substances have the function of oxidizing and decomposing pollutants in the sewage, thereby reducing the components such as COD, BOD5, ammonia nitrogen and the like in the sewage to a certain extent. In addition, the electric field formed by the anode electrode and the cathode electrode changes the original mutual repulsion between the particles into attraction and coalescence.

Meanwhile, the sewage dissolved with air in the dissolved air tank 31 flows into the cylinder 321, the ultrasonic generator 50 sends out ultrasonic waves to drive the surrounding water body to vibrate at high frequency, the waterproof breathable film 322 generates high-frequency vibration along with the water body, and part of the ultrasonic waves are in the inwards concave state at the sieve pores of the hard net plate 323 in the vibration process, because the vibration frequency is very high, the inwards concave speed of the waterproof breathable film 322 is extremely high, at the moment, the air pressure at the corresponding position is inevitably increased suddenly to exceed the water pressure at the other side of the waterproof breathable film 322, so that part of the air passes through the waterproof breathable film 322 under the action of pressure difference, and the air can form bubbles to continue moving outwards after passing through the hard net plate 323. The soft net plate 324 at the side hole 325 is affected by ultrasonic waves and can generate high-frequency vibration, when the bubbles pass through the soft net plate 324, the high-frequency vibration soft net plate 324 can smash the bubbles into micro-bubbles with smaller diameters, and the micro-bubbles can adsorb flocculates in the sewage after entering the electrocoagulation-air flotation tank 11, so that the flocculates suspended in the electrocoagulation-air flotation tank 11 can quickly float on the upper water surface. In addition, the ultrasonic wave generating device 50 generates high-frequency vibration to drive the flocculate suspended in the sewage to vibrate rapidly, so that the flocculate is crushed and disintegrated rapidly, the comprehensive density of the disintegrated and crushed flocculate and the attached microbubbles is lower, and the flocculate can float upwards to the water surface more rapidly; in addition, the ultrasonic generator 50 can also burst the micro-bubbles escaping from the micro-bubble generator 32 into micro-sized bubbles with smaller diameter, so that the bubbles are easily combined with the flocculates in the sewage to treat the flocculates in the sewage more thoroughly, and finally the scum on the water surface is scraped to the scum collecting tank 121 by the scum scraping device 40.

The utility model realizes the high-efficiency purification treatment of the sewage through the coordination of the electric flocculation device 20, the dissolved air floatation device and the ultrasonic wave generating device 50, enables suspended impurities in the sewage to interact with each other through the electric flocculation device 20 to generate flocculate, and can reduce the COD, BOD5, ammonia nitrogen and other components in the sewage to a certain extent; can explode the microbubble that escapes from microbubble generator 32 through ultrasonic wave generating device 50 and open into the bubble that the diameter is the micron order, these bubbles easily combine together with the flocculation thing in the sewage for the flocculation thing that suspends in sewage can be quick float on the upper water level, and is handled more thoroughly to flocculation thing in the sewage. In addition, the ultrasonic generator 50 generates high-frequency vibration to drive the flocculate suspended in the sewage to vibrate rapidly, so that the flocculate is crushed and disintegrated rapidly, the comprehensive density of the disintegrated and crushed flocculate and the attached microbubbles is lower, and the flocculate can float up to the water surface more rapidly. In addition, the ultrasonic generator 50 generates high frequency vibration to drive the suspended flocculate in the sewage to vibrate rapidly, so as to prevent the flocculate from being adhered to the electrode to cause short circuit in the electrolytic process of the electric flocculation device 20.

The above descriptions of the embodiments of the present invention that are not related to the present invention are well known in the art, and can be implemented by referring to the well-known technologies.

In light of the foregoing, it will be apparent to those skilled in the art from this disclosure that various changes and modifications can be made without departing from the spirit and scope of the invention. The technical scope of the present invention is not limited to the content of the specification, and must be determined according to the scope of the claims.

Claims

1. An electrocoagulation-air flotation machine comprises an equipment shell, an electrocoagulation device and a slag scraping device, wherein the equipment shell is internally provided with an electrocoagulation-air flotation tank and a slag collecting-sedimentation tank, the electrocoagulation device comprises an electrode arranged in the electrocoagulation-air flotation tank, and is characterized in that: the device comprises a dissolved air flotation device and an ultrasonic generation device, wherein the ultrasonic generation device is arranged in the electrocoagulation-flotation tank, the dissolved air flotation device comprises a dissolved air tank, a micro bubble generator connected with the dissolved air tank through a pipeline, a water pump and an air compressor, and the micro bubble generator is arranged in the electrocoagulation-flotation tank.

2. The electroflocculation air flotation machine according to claim 1, characterized in that: the left side of the equipment shell is provided with a water inlet communicated with the electric flocculation-air floatation tank, the right side of the equipment shell is provided with a water outlet and a slag outlet which are communicated with the slag collection-sedimentation tank, the top of the equipment shell is provided with a slag scraping device above the electric flocculation-air floatation tank and the slag collection-sedimentation tank, and the top of the right side of the slag collection-sedimentation tank is provided with a slag collection groove communicated with the slag outlet and close to the slag scraping device.

3. The electroflocculation air flotation machine according to claim 2, characterized in that: the slag scraping device comprises two bearing seats arranged at the top of the equipment shell, a chain wheel arranged on the bearing seats, a transmission hinge sleeved on the chain wheel and a scraper plate arranged on the transmission hinge.

4. The electroflocculation air flotation machine according to claim 1, characterized in that: the electrode comprises a plurality of cathode electrodes and anode electrodes which are arranged in a staggered mode and fixed through an electrode fixing frame, wherein the anode electrodes are made of iron, and the cathode electrodes are made of graphite.

5. The electroflocculation air flotation machine according to claim 1, characterized in that: microbubble generator includes barrel, waterproof ventilated membrane, hard otter board and soft otter board, and a plurality of side openings have been seted up to the barrel lateral wall, and every side opening department all is equipped with the waterproof ventilated membrane of one deck, two-layer hard otter board and one deck soft otter board, and two-layer hard otter board is laminated in waterproof ventilated membrane both sides, the sieve mesh dislocation set of the hard otter board of waterproof ventilated membrane both sides.

6. The electroflocculation air flotation machine according to claim 5, characterized in that: the top of the dissolved air tank is communicated with the residue collecting-settling tank through a backflow water pipeline, the backflow water pipeline is provided with the water pump, one side of the bottom of the dissolved air tank is connected with the air compressor through a pipeline, and the other side of the bottom of the dissolved air tank is communicated with the barrel through a water inlet pipeline extending into the electric flocculation-air flotation tank.

7. The electroflocculation air flotation machine according to claim 5, characterized in that: the inner wall of the upper end of the cylinder body is connected with a piston in a sealing and sliding manner, the piston can slide up and down in the cylinder body, and a limit switch is arranged at an opening at the upper end of the cylinder body.

8. The electroflocculation air flotation machine according to any one of claims 1 to 7, characterized in that: the slag collecting-settling pond is internally provided with a first-stage sedimentation inclined pipe and a second-stage sedimentation inclined pipe arranged above the first-stage sedimentation inclined pipe, the bottom of the slag collecting-settling pond is provided with a conical hopper, the first-stage sedimentation inclined pipe and the horizontal direction form an included angle of 60 degrees, and the second-stage sedimentation inclined pipe and the first-stage sedimentation inclined pipe form an included angle of 120 degrees.