An anti-scaling electro-flocculation oxidation flotation device

Abstract

The present invention relates to an anti-scaling electro-flocculation oxidation flotation device, which relates to the field of electrochemical water treatment, and includes a tank body, an ozone loading system, an electro-flocculation electrode assembly and an ultrasonic vibration plate. An electro-flocculation tank is provided in the tank body, the ozone loading system is connected to the lower part of the electro-flocculation tank, the electro-flocculation electrode assembly is installed in the middle of the electro-flocculation tank, and an ultrasonic vibration plate is fixed in the electro-flocculation tank. The present invention adopts ozone, ultrasonic waves, gas-liquid two-phase flow and other means to dilute ion enrichment and reduce the polarization phenomenon on the surface of the electro-flocculation electrode assembly. The passivation phenomenon of the electro-flocculation electrode assembly is eliminated, so that the electro-flocculation electrode assembly is always in an activated state, the working efficiency of the electro-flocculation electrode assembly is improved, and the stability of the equipment operation is improved. There are few moving parts, a compact structure, a high density of the electro-flocculation electrode assembly, a large electrode load, a small device size, few adjustment parts, stable performance, good treatment effect, and simple operation and maintenance.

Description

Technical Field

[0001] The invention relates to the field of electrochemical water treatment, and in particular to an anti-scaling electro-flocculation oxidation flotation device. Background Art

[0002] Electrocoagulation is an electrochemical method for purifying wastewater. The positive and negative electrodes in the electrocoagulation reactor undergo redox reactions under the action of an external DC electric field. This method uses electrochemical principles to produce electrochemical reactions with the help of an external voltage, converting electrical energy into chemical energy. A single electrocoagulation device can perform redox reactions on organic and inorganic substances in wastewater, and then condense and float them to separate pollutants from the water body. It can effectively remove various harmful pollutants such as COD, heavy metals, suspended matter, oil, and phosphates in wastewater. Application objects include: drilling wastewater, fracturing flowback fluid, oilfield produced water, coalbed methane produced water, dye wastewater, printing and dyeing wastewater, garbage leachate, pharmaceutical wastewater, papermaking wastewater, electroplating wastewater, leathermaking wastewater, etc.

[0003] Including the following aspects:

[0004] (1) Flocculation: When a soluble anode such as iron or aluminum is supplied with direct current, the anode loses electrons to form metal cations Fe 2+ 、Al 3+ , and OH in the solution - Metal hydroxide colloidal flocculants are generated. This type of new ecological hydroxide has high activity and strong adsorption capacity. It combines with colloids, suspended matter, soluble pollutants, bacteria, viruses, etc. in the raw water to form larger flocs, which are removed through sedimentation and flotation. This process is similar to the mechanism of chemical flocculation, including charge neutralization, adsorption bridging, and compression of the double electric layer.

[0005] (2) Flotation: When the voltage reaches the decomposition voltage of water during the electrolysis process, hydrogen and oxygen are precipitated at the cathode and anode respectively. The generated gas appears in the form of highly dispersed tiny bubbles, which adhere to pollutants such as colloids and emulsions in the raw water and float to the water surface to be removed.

[0006] (3) Oxidation: Oxidation in the electrolysis process can be divided into direct oxidation and indirect oxidation. Direct oxidation means that the pollutants directly lose electrons at the anode and oxidize. Indirect oxidation uses anions with lower electrode potential in the solution, such as OH - , Cl - The active substances [O] and Cl2, which lose electrons at the anode and generate new stronger oxidants, are used to make pollutants lose electrons and oxidize and decompose them, thereby reducing BOD5 and COD in the original solution. cr , ammonia nitrogen, etc.

[0007] (4) Reduction: The reduction in the electrolysis process is divided into direct reduction and indirect reduction. Direct reduction means that the pollutants directly obtain electrons at the cathode and undergo reduction. Indirect reduction means that the cations in the pollutants first obtain electrons at the cathode, so that the high-valent or low-valent metal cations in the electrolyte obtain electrons at the cathode and are directly reduced to low-valent cations or metal precipitates.

[0008] Since electro-flocculation technology does not require the addition of chemicals, the amount of sludge produced by the electro-flocculation process is usually 40% less than that of other treatment processes, and the sludge density is high, which greatly reduces the sludge disposal cost and also realizes the clean production of sewage treatment process;

[0009] The equipment has a high degree of automation, simple operation, low requirements for operators, stable operation, stable effluent quality, short equipment processing time and high processing efficiency; the project investment of the electro-flocculation treatment process is basically equivalent to that of other treatment processes, but the operating cost of the electro-flocculation treatment process is usually only between 1 / 3 and 1 / 2 of the operating cost of other treatment processes; the hydroxide produced by the electro-flocculation method is more active than the chemical flocculant, has strong coagulation and adsorption capacity, and has a good treatment effect. The amount of metal ions required is only about 1 / 3 of that of the chemical coagulation method, and the anion content in the water will not increase due to the addition of chemicals to the water; since the product of the electrolysis reaction in the electro-flocculation process is only ions, no oxidant or reductant needs to be added, and no or little pollution is generated to the environment. It is an environmentally friendly water treatment technology.

[0010] Electrocoagulation technology can treat a variety of wastewaters, and is more advantageous in treating wastewater with high concentration, difficult biodegradation, and high ammonia nitrogen content.

[0011] At present, the electrocoagulation technology mainly connects multiple sets of parallel plates with direct current to generate an electric field between the plates, so that the water to be treated flows into the gaps between the plates. At this time, the energized plates will undergo an electrochemical reaction to dissolve Al 3+ or Fe 2+ The plasma is hydrolyzed in water to produce a flocculation reaction. During this process, other effects such as electrical flotation and oxidation-reduction occur simultaneously.

[0012] However, the external electric field will also cause the anions and cations to move in a directional manner in the electric field, causing cations such as calcium and magnesium to be enriched near the cathode, combining with the high concentration of hydroxide ions produced by the cathode to produce hydroxide precipitation, which firmly adheres to the electrode surface, causing the electrode to passivate. These hydroxides will continue to deposit on the surface of the passivated electrode, accumulating continuously, making the scale on the electrode surface thicker and thicker. The hydroxide scale has poor conductivity and acts as an insulator on the electrode surface, reducing the current intensity of the electrode and increasing the voltage, so that the plate cannot discharge normally and evenly. The current intensity of the electrode surface that has partially lost the passivation scale increases dramatically, causing local excessive dissolution, destroying the overall structure of the plate, and even damaging the terminal, tank and other components.

[0013] Electrocoagulation produces a large number of microbubbles, which assist the buoyancy and separation of flocculants in water. If used improperly, it cannot produce effective separation effect.

[0014] The oxidation effect of electrocoagulation is limited and cannot significantly damage organic pollutants. Summary of the invention

[0015] The technical problem to be solved by the present invention is how to improve the working efficiency of electrodes and improve the stability of equipment.

[0016] The technical solution of the present invention to solve the above technical problems is as follows: an anti-scaling electro-flocculation oxidation flotation device, comprising a tank body, an ozone loading system, an electro-flocculation electrode assembly and an ultrasonic vibration plate, wherein an electro-flocculation tank is provided in the tank body, the ozone loading system is connected to the lower part of the electro-flocculation tank, the electro-flocculation electrode assembly is installed in the middle part of the electro-flocculation tank, and the ultrasonic vibration plate is fixed in the electro-flocculation tank.

[0017] The beneficial effects of the present invention are as follows: the incoming liquid is mixed with ozone gas in the ozone loading system and enters the electro-flocculation tank. Ozone oxidizes organic matter and low-valent inorganic matter in the water, effectively destroys dissolved organic matter, and converts it into insoluble matter for precipitation. The electro-flocculation electrode assembly in the electro-flocculation tank produces an electro-flocculation effect under the action of the electric field, releasing high-valent flocculants such as iron ions or aluminum ions, and the flocculants are hydrolyzed to produce hydroxide colloids to flocculate the suspended matter in the incoming liquid. Ozone can oxidize the divalent iron ions produced by the electro-flocculation electrode assembly into trivalent iron ions that adapt to a wider pH range and have better sedimentation properties, thereby avoiding the large-scale pH adjustment of divalent iron ions.

[0018] The ultrasonic vibration plate generates high-frequency mechanical vibration, so that ultrasonic conduction is formed in the water body. Ultrasonic waves generate vibration and mixing effects in the water body, destroying the high-concentration ion membrane enriched by electric field polarization on the surface of the electro-flocculation electrode assembly, mixing the scale-forming ions into the water, and diluting the ion enrichment from a microscopic perspective. It eliminates the hydroxide scale formed by hardness ions, eliminates the passivation phenomenon of the electrode, keeps the electrode in an activated state, improves the working efficiency of the electrode, and improves the stability of equipment operation.

[0019] Based on the above technical solution, the present invention can also be improved as follows.

[0020] Furthermore, the electro-flocculation electrode assembly comprises at least one group of electrode plates which are parallel to each other and spaced apart, and at least one ultrasonic vibration plate is disposed on the side wall of the electro-flocculation tank, and the ultrasonic vibration plate is perpendicular to the electrode plates.

[0021] Furthermore, the ozone loading system includes a liquid inlet pipeline, an ozone air inlet pipeline, an air dissolving pump and a water distributor. The liquid inlet pipeline and the ozone air inlet pipeline are respectively connected to the pump liquid inlet and pump air inlet of the air dissolving pump, the pump outlet of the air dissolving pump is connected to the water distributor, and the water distributor is fixed at the lower part of the electric flocculation tank.

[0022] The beneficial effect of adopting the above further scheme is: the incoming liquid enters the dissolved air pump through the liquid inlet pipeline, the ozone enters the dissolved air pump through the ozone inlet pipeline, the incoming liquid is mixed with the ozone gas in the dissolved air pump, and is passed into the water distributor by the dissolved air pump and evenly distributed in the electric flocculation tank. The anti-scaling electric flocculation oxidation flotation device treats the incoming liquid evenly and has high treatment efficiency.

[0023] Furthermore, it also includes a middle partition, which is vertically fixed in the tank body and separates the lower middle part of the tank body into the electric flocculation tank and the air flotation tank.

[0024] Furthermore, it also includes a slag scraping mechanism, the upper part of the trough body has a slag discharge port connected to the outside of the trough body, the slag scraping mechanism is fixed to the upper part of the trough body and is used to push the air-floating slag to the slag discharge port.

[0025] The beneficial effect of adopting the above further solution is that the air-floating scum on the top of the liquid in the tank body is scraped toward the scum discharge port by the scum scraping mechanism and discharged outside.

[0026] Furthermore, it also includes a scraping inclined plate, a scum groove is fixed on the upper part of the groove body, the bottom surface of the scum groove has the scum discharge port, one end of the scraping inclined plate is fixedly connected to the upper edge of the scum groove, and the other end extends toward the scraping mechanism and tilts downward.

[0027] The beneficial effect of adopting the above further scheme is that the air-floating scum is pushed by the scum scraping mechanism, and when it approaches the scum groove, the scum scraping inclined plate plays a guiding role, and the scum is scraped into the scum groove along the scum scraping inclined plate and discharged outside.

[0028] Furthermore, it also includes a slag guide plate, the slag trough is located above the air flotation trough, one end of the slag guide plate is fixedly connected to the side wall of the slag trough, and the other end extends toward the scraping mechanism and tilts upward.

[0029] The beneficial effect of adopting the above further scheme is that the air flotation tank and the electric flocculation tank are adjacent, and are separated by a middle partition to an appropriate height below the liquid surface. The incoming liquid after electric flocculation goes over the middle partition from the top of the electric flocculation tank to the air flotation tank. In the electric flocculation tank and the air flotation tank, the air dissolved by the air pump that is not oxidized into ozone is gradually released to form tiny bubbles, which adhere to the flocs produced by the electric flocculation, significantly reducing the overall density of the flocs, and quickly float up in the water body to the top of the liquid. The flocs in the floating process move to the side away from the scum tank under the guidance of the slag guide plate, and then are pushed into the scum tank along the slag scraping inclined plate under the action of the slag scraping mechanism.

[0030] Furthermore, it also includes an overflow pipe, one end of which is connected to the lower part of the air flotation tank, and the other end of which extends upward.

[0031] The beneficial effect of adopting the above further solution is that the liquid in the lower part of the flotation tank is discharged through overflow, and the liquid in the tank body has sufficient processing time.

[0032] Furthermore, it also includes a drainage hole pipe, a side wall of which is distributed with a plurality of drainage holes, the drainage hole pipe is horizontally fixed to the lower part of the air flotation tank, and one end of the drainage hole pipe is connected to one end of the overflow pipe.

[0033] The beneficial effect of adopting the above further solution is that the drainage hole pipe can make the liquid flow out of the flotation tank stably and evenly, avoiding the strong water flow from disturbing the liquid in the flotation tank and destroying the flotation separation state.

[0034] Furthermore, it also includes an overflow trough and an overflow plate, the overflow trough is fixed to the upper part of the trough body, the overflow plate is vertically installed in the overflow trough, and the middle and lower parts of the overflow trough are divided into a first overflow chamber and a second overflow chamber, the other end of the overflow pipe is connected to the first overflow chamber, and the second overflow chamber has a water outlet.

[0035] The beneficial effect of adopting the above further solution is that the liquid in the overflow pipe enters the overflow groove, then overflows through the overflow plate with adjustable height, and is discharged from the water outlet.

[0036] Furthermore, it also includes a fan and an aeration pipe, wherein the aeration pipe is fixed at the lower part of the electric flocculation tank, and the fan is connected to the aeration pipe.

[0037] The beneficial effect of adopting the above further scheme is that a large amount of gas is blown into the aeration pipe arranged at the bottom of the electro-flocculation tank by the fan, and is cut into a large number of tiny bubbles through the aeration pipe. The tiny bubbles have a large density difference with water, which generates a large buoyancy, and the gas-liquid two-phase flow generates squeezing, suction, stirring and other effects. The viscosity generated by the bubbles and the surrounding liquid also makes it a macroscopic rectifier, which floats together and makes rapid relative motion with the electro-flocculation electrode assembly, and forms convection in the electro-flocculation tank, which dilutes the ion enrichment in the macro aspect and reduces the polarization phenomenon on the electrode surface.

[0038] The present invention utilizes the strong oxidation effect of ozone to effectively destroy dissolved organic matter and convert it into insoluble matter for precipitation. It can also oxidize the divalent iron ions generated by the iron plate into trivalent iron ions that are more adaptable to a wider pH range and have better sedimentation properties, thereby avoiding the large-scale pH adjustment of divalent iron ions. The vibration and mixing effects of ultrasonic waves are utilized to destroy the ion membrane enriched on the surface of the electro-flocculation electrode assembly, so that the scale-forming ions are mixed in the water, and the ion enrichment is diluted from a microscopic aspect; the extrusion, suction, stirring and other effects generated by the gas-liquid two-phase flow are utilized to dilute the ion enrichment from a macroscopic aspect, and reduce the polarization phenomenon on the surface of the electro-flocculation electrode assembly. The hydroxide scale formed by the hardness ions is eliminated, and the passivation phenomenon of the electro-flocculation electrode assembly is eliminated, so that the electro-flocculation electrode assembly is always in an activated state, the working efficiency of the electro-flocculation electrode assembly is improved, and the stability of the equipment operation is improved. There are few moving parts, a compact structure, a high density of the electro-flocculation electrode assembly, a large electrode load, a small device volume, few adjustment parts, stable performance, good treatment effect, and simple operation and maintenance. BRIEF DESCRIPTION OF THE DRAWINGS

[0039] Figure 1 It is a structural diagram of the anti-scaling electro-flocculation oxidation flotation device of the present invention.

[0040] In the accompanying drawings, the components represented by the reference numerals are listed as follows:

[0041] 1. Liquid inlet pipeline; 2. Ozone generator; 3. Ozone air inlet pipeline; 4. Dissolved air pump; 5. Fan; 6. Aeration pipe; 7. Water distributor; 8. Ultrasonic vibration plate; 9. Electrocoagulation electrode assembly; 10. Tank body; 11. Middle partition; 12. Slag scraping plate; 13. Slag scraping mechanism; 14. Ultrasonic generator; 15. Electrocoagulation power supply; 16. Overflow tank; 17. Overflow plate; 18. Slag scraping inclined plate; 19. Water outlet; 20. Slag discharge port; 21. Slag guide plate; 22. Overflow pipe; 23. Air flotation tank; 24. Drain hole pipe; 25. Electrocoagulation tank. DETAILED DESCRIPTION

[0042] The principles and features of the present invention are described below. The examples given are only used to explain the present invention and are not used to limit the scope of the present invention.

[0043] like Figure 1As shown, this embodiment provides an anti-scaling electro-flocculation oxidation flotation device, including a tank body 10, an ozone loading system, an electro-flocculation electrode assembly 9 and an ultrasonic vibration plate 8. An electro-flocculation tank 25 is provided in the tank body 10, the ozone loading system is connected to the lower part of the electro-flocculation tank 25, the electro-flocculation electrode assembly 9 is installed in the middle of the electro-flocculation tank 25, and the ultrasonic vibration plate 8 is fixed in the electro-flocculation tank 25.

[0044] The incoming liquid (liquid to be treated) is mixed with ozone gas in the ozone loading system and enters the electro-flocculation tank 25. Ozone oxidizes organic matter and low-valent inorganic matter in the water, effectively destroys dissolved organic matter, and converts it into insoluble matter for precipitation. The electro-flocculation electrode assembly 9 in the electro-flocculation tank 25 produces an electro-flocculation effect under the action of the electric field, releasing high-valent flocculants such as iron ions or aluminum ions, and the flocculants are hydrolyzed to produce hydroxide colloids to flocculate the suspended matter in the incoming liquid. Ozone can oxidize the divalent iron ions produced by the electro-flocculation electrode assembly 9 into trivalent iron ions that are more adaptable to a wider pH range and have better sedimentation properties, thereby avoiding the wide range of pH adjustment when using divalent iron ions.

[0045] The ultrasonic vibration plate 8 generates high-frequency mechanical vibration, so that ultrasonic wave conduction is formed in the water body. Ultrasonic waves generate vibration and mixing effects in the water body, destroying the high-concentration ion membrane enriched by electric field polarization on the surface of the electro-flocculation electrode assembly 9, mixing the scale-forming ions into the water, and diluting the ion enrichment from a microscopic aspect. The hydroxide scale formed by the hardness ions is eliminated, the passivation phenomenon of the electrode is eliminated, the electrode is always in an activated state, the working efficiency of the electrode is improved, and the stability of the equipment operation is improved.

[0046] Optionally, the cross section of the tank body 10 may be rectangular, circular or the like.

[0047] Specifically, the ultrasonic vibration plate 8 is connected to the ultrasonic generator 14 via a wire.

[0048] Based on any of the above solutions, the electrocoagulation electrode assembly 9 includes at least one set of electrode plates that are parallel to each other and spaced apart, and at least one ultrasonic vibration plate 8 is provided on the side wall of the electrocoagulation tank 25, and the ultrasonic vibration plate 8 is perpendicular to the electrode plates.

[0049] The electro-flocculation electrode assembly 9 includes at least one group of electrode plates that are parallel to each other and spaced apart. Each group of electrode plates includes two power-connected electrode plates. Optionally, each group of electrode plates may also include an induction electrode plate disposed between the two power-connected electrode plates, and the two power-connected electrode plates of each group are respectively connected to the positive and negative electrodes of the electro-flocculation power supply 15, and are called anode electrode plates and cathode electrode plates. When there are at least two groups of electrode plates, each anode electrode plate is connected in series or in parallel, and each cathode electrode plate is connected in series or in parallel, and the power-connected electrode plates are rotated out of the electro-flocculation tank 25 through the terminal posts and connected to the positive and negative electrodes of the output end of the electro-flocculation power supply 15.

[0050] Specifically, the power electrode plate and the induction electrode plate are both flat plates. The ultrasonic vibration plate 8 is a plate-shaped assembly.

[0051] Optionally, the power-connecting electrode plate can be made of conductive materials such as iron plate, aluminum plate, stainless steel plate, titanium plate, coated plate, etc. It can be in various forms such as plate, perforated plate, mesh material, etc.

[0052] Optionally, a terminal block is installed on the side wall of the tank body 10, and the power electrode plate has a terminal block connected to the terminal block, and the terminal block can be connected to the terminal block from underwater or above water.

[0053] Optionally, the electro-flocculation electrode assembly 9 is fixedly connected to the electro-flocculation tank 25, or the electro-flocculation electrode assembly 9 is detachably connected to the electro-flocculation tank 25, and an electro-flocculation electrode slot or other limiting device can be provided in the electro-flocculation tank 25, and the electro-flocculation electrode assembly 9 is inserted into the electro-flocculation electrode slot. This is convenient for fixing the position of the electro-flocculation electrode assembly 9 and for removing and repairing the electro-flocculation electrode assembly 9.

[0054] Specifically, the ultrasonic vibration plate 8 is perpendicular to the electrocoagulation electrode assembly 9 and is arranged at at least one end of the electrocoagulation electrode assembly 9. That is to say, the ultrasonic vibration plate 8 is perpendicular to each group of electrode plates of the electrocoagulation electrode assembly 9. The ultrasonic vibration plate 8 is arranged at one end of the electrocoagulation electrode assembly 9, or the ultrasonic vibration plates 8 are arranged at both ends of the electrocoagulation electrode assembly 9. Ultrasonic waves pass between the two electrode plates of the electrocoagulation electrode assembly 9, effectively eliminating the hydroxide scale on the surface of the electrode plates. When there are at least two ultrasonic vibration plates 8, at least two ultrasonic vibration plates 8 are located at the same end of the electrocoagulation electrode assembly 9 and are arranged side by side, or at least one ultrasonic vibration plate 8 is arranged at each end of the electrocoagulation electrode assembly 9.

[0055] Based on any of the above schemes, the ozone loading system includes a liquid inlet pipeline 1, an ozone air inlet pipeline 3, an air dissolving pump 4 and a water distributor 7. The liquid inlet pipeline 1 and the ozone air inlet pipeline 3 are respectively connected to the pump liquid inlet and pump air inlet of the air dissolving pump 4, and the pump outlet of the air dissolving pump 4 is connected to the water distributor 7. The water distributor 7 is fixed at the lower part of the electric flocculation tank 25.

[0056] The incoming liquid enters the dissolved air pump 4 through the liquid inlet pipeline 1, and the ozone enters the dissolved air pump 4 through the ozone inlet pipeline 3. The incoming liquid is mixed with the ozone gas in the dissolved air pump 4, and is passed into the water distributor 7 by the dissolved air pump 4, and is evenly distributed in the electric flocculation tank 25. The anti-scaling electric flocculation oxidation flotation device treats the incoming liquid evenly and has high treatment efficiency.

[0057] Specifically, the ozone inlet pipeline 3 is connected to the ozone generator 2, and the ozone generator 2 generates ozone, which is sent to the dissolved air pump 4 through the ozone inlet pipeline 3. The ozone generator 2 can be an air source or an oxygen source.

[0058] Wherein, the dissolved air pump 4 can be in the form of a multi-stage centrifugal pump, a vortex pump, etc.

[0059] The water distributor 7 facilitates the water flow to evenly pass through the electro-flocculation electrode assembly area. The water distributor 7 can be in the form of slits, wire mesh, water caps, etc.

[0060] On the basis of any of the above solutions, it further comprises a middle partition 11 , which is vertically fixed in the tank body 10 and separates the lower middle part of the tank body 10 into the electric flocculation tank 25 and the air flotation tank 23 .

[0061] The liquid level in the tank body 10 is higher than the middle partition plate 11 .

[0062] Based on any of the above schemes, it also includes a scraping mechanism 13, the upper part of the trough body 10 has a slag discharge port 20 connected to the outside of the trough body 10, and the scraping mechanism 13 is fixed to the upper part of the trough body 10 and is used to push the air-floating slag to the slag discharge port 20.

[0063] The air-floating scum on the top of the liquid in the tank body 10 is scraped toward the scum discharge port 20 by the scum scraping mechanism 13 and discharged outside.

[0064] Specifically, the scraping mechanism 13 is located above the electroflocculation tank 25 and the air flotation tank 23. The scraping mechanism 13 includes a rotating mechanism and a scraping plate 12. The rotating mechanism rotates in one direction, and the rotating mechanism can be a conveyor chain or a conveyor belt. The scraping plate 12 is perpendicular to the rotation direction of the rotating mechanism and is fixedly connected to the rotating mechanism. The scraping plate 12 rotates under the drive of the rotating mechanism and pushes the air flotation slag toward the slag discharge port 20. The scraping plate 12 can be set to one or more, and multiple scraping plates 12 are arranged at intervals.

[0065] Based on any of the above schemes, it also includes a scraper inclined plate 18, a slag trough is fixed on the upper part of the trough body 10, and the bottom surface of the slag trough has the slag discharge port 20, one end of the scraper inclined plate 18 is fixedly connected to the upper edge of the slag trough, and the other end extends toward the scraper mechanism 13 and tilts downward.

[0066] The air-floating scum is pushed by the scum scraping mechanism 13, and when it approaches the scum groove, the scum scraping inclined plate 18 plays a guiding role, and the scum is scraped into the scum groove along the scum scraping inclined plate 18 and discharged outside.

[0067] The scum tank can be arranged at any position on the upper part of the tank body 10 , and can be located above the electric flocculation tank 25 or above the air flotation tank 23 .

[0068] On the basis of any of the above schemes, a slag guide plate 21 is further included. The slag trough is located above the air flotation trough 23. One end of the slag guide plate 21 is fixedly connected to the side wall of the slag trough, and the other end extends toward the scraping mechanism 13 and tilts upward.

[0069] The flotation tank 23 and the electroflocculation tank 25 are adjacent, and are separated by the middle partition 11 to a proper height below the liquid surface. The incoming liquid after electroflocculation passes through the middle partition 11 from the top of the electroflocculation tank 25 to the flotation tank 23. In the electroflocculation tank 25 and the flotation tank 23, the air dissolved by the air dissolving pump that is not oxidized into ozone is gradually released to form tiny bubbles, which adhere to the flocs produced by the electroflocculation, significantly reducing the overall density of the flocs, and quickly float up in the water body to the top of the liquid. The flocs in the floating process move to the side away from the scum tank under the guidance of the slag guide plate 21, and then are pushed into the scum tank along the slag scraping inclined plate 18 under the action of the slag scraping mechanism 13.

[0070] On the basis of any of the above solutions, an overflow pipe 22 is further included, one end of which is connected to the lower part of the air flotation tank 23, and the other end of which extends upward.

[0071] The liquid in the lower part of the flotation tank 23 is discharged through overflow, and the liquid in the tank body 10 has sufficient processing time.

[0072] On the basis of any of the above schemes, it also includes a drainage hole pipe 24, the side wall of which is distributed with a plurality of drainage holes. The drainage hole pipe 24 is horizontally fixed to the lower part of the flotation tank 23, and one end of the drainage hole pipe 24 is connected to one end of the overflow pipe 22.

[0073] The drain hole pipe 24 can make the liquid flow out of the air flotation tank 23 stably and evenly, and prevent the strong water flow from disturbing the liquid in the air flotation tank 23 and destroying the air flotation separation state.

[0074] On the basis of any of the above schemes, it also includes an overflow trough 16 and an overflow plate 17, the overflow trough 16 is fixed to the upper part of the trough body 10, the overflow plate 17 is vertically installed in the overflow trough 16, and the middle and lower parts of the overflow trough 16 are divided into a first overflow chamber and a second overflow chamber, the other end of the overflow pipe 22 is connected to the first overflow chamber, and the second overflow chamber has a water outlet 19.

[0075] The liquid in the overflow pipe 22 enters the overflow groove 16 , then overflows through the overflow plate 17 with adjustable height, and is discharged from the water outlet 19 .

[0076] Optionally, an overflow plate slot is provided in the overflow trough 16, and the overflow plate 17 is inserted into the overflow plate slot. Overflow plates 17 of different heights are provided, and the height of the overflow plate 17 can be conveniently adjusted to ensure that the overall height of the liquid level in the trough body 10 is in the middle of the scraper inclined plate 18.

[0077] On the basis of any of the above solutions, it further includes a fan 5 and an aeration pipe 6 , wherein the aeration pipe 6 is fixed at the lower part of the electric flocculation tank 25 , and the fan 5 is communicated with the aeration pipe 6 .

[0078] A large amount of gas is blown into the aeration pipe 6 arranged at the bottom of the electro-flocculation tank 25 by the fan 5, and is cut into a large number of tiny bubbles through the aeration pipe 6. The tiny bubbles have a large density difference with water, which generates a large buoyancy force, and the gas-liquid two-phase flow generates squeezing, suction, stirring and other effects. The viscosity generated by the bubbles and the surrounding liquid also makes them a macroscopic rectifier, which floats together and makes a rapid relative motion with the electro-flocculation electrode assembly 9, and forms a convection phenomenon in the electro-flocculation tank 25, which dilutes the ion enrichment in the macro aspect and reduces the polarization phenomenon on the electrode surface.

[0079] The fan 5 is a blower, which may be a Roots blower or other types of blowers.

[0080] In a specific embodiment, the ozone generator 2 uses an air source, and the ozone air inlet pipeline 3 of the ozone generator 2 is connected to the pump air inlet of the air dissolving pump 4 through a flow regulating metering device. The air dissolving pump 4 uses a vortex pump, and the pump inlet of the air dissolving pump 4 receives the incoming liquid, which is pressurized and mixed by the air dissolving pump 4, and the gas-liquid two-phase is mixed and dissolved, and the ozone and the air that has not been converted into ozone are dissolved in the incoming liquid to form pressurized dissolved air water. The dissolved ozone oxidizes and breaks the long-chain organic matter, and oxidizes the trace divalent iron ions contained in the incoming liquid into trivalent iron ions, and the trivalent iron ions are hydrolyzed to generate iron hydroxide colloid, and gradually form flocs. The pump outlet of the air dissolving pump 4 is connected to the liquid inlet of the electric flocculation tank 25, and the incoming liquid containing the iron hydroxide colloid generated by oxidation degradation and hydrolysis enters the electric flocculation tank 25.

[0081] The electro-flocculation tank 25 adopts a rectangular structure with a rectangular cross section. The outlet of the fan 5 is connected to the air inlet of the electro-flocculation tank 25. 20 induction electrodes and a pair of contact electrode plates (anode electrode plate and cathode electrode plate) are arranged in the middle of the electro-flocculation tank 25. The induction electrode plate is made of aluminum plate, which is inserted into the electro-flocculation electrode slot arranged in the electro-flocculation tank 25 for easy maintenance and replacement. The contact electrode plate is an iron plate, which is inserted into the end face slot arranged in the electro-flocculation tank 25. The contact electrode plate terminal extends to the water surface and is connected to the wire on the water surface. The two contact electrode plates are connected to the positive and negative poles of the output end of the electro-flocculation power supply 15. Two groups of ultrasonic vibration plates 8 are arranged on both sides of the electro-flocculation tank 25 perpendicular to the electro-flocculation electrode assembly 9. The ultrasonic vibration plate 8 is connected to the ultrasonic generator 14 through a wire. A water distributor 7 is arranged at the bottom of the electro-flocculation tank 25 to facilitate the water flow to evenly pass through the electro-flocculation electrode assembly area. The water distributor 7 is in the form of a slit. An aeration pipe 6 is provided at the bottom of the electroflocculation tank 25, and the outlet of the fan 5 is connected to the air inlet of the aeration pipe 6 in the electroflocculation tank 25. The flotation tank 23 is adjacent to the electroflocculation tank 25, and is separated by a middle partition 11 to a height of 200 mm below the liquid surface. A scraping mechanism 13 is provided on the top of the electroflocculation tank 25 and the flotation tank 23. The scraping mechanism 13 rotates counterclockwise, and the flotation scum is scraped into the scum tank by the scraping mechanism 13 along the scraping inclined plate 18 and discharged outside. The water outlet of the flotation tank 23 is discharged after adjusting the height through the overflow pipe 22 and the overflow plate 17. The overflow plate 17 is arranged in the overflow tank 16, which is convenient for adjusting the height of the overflow plate 17 to ensure that the overall height of the liquid level is in the middle of the scraping inclined plate 18.

[0082] During operation, the incoming liquid is mixed with ozone gas in the air dissolving pump 4 and enters the electric flocculation tank 25. Ozone oxidizes organic matter and low-valent inorganic matter in the water, effectively destroys dissolved organic matter, converts it into insoluble matter and precipitates it, oxidizes trace divalent iron ions contained in the incoming liquid into trivalent iron ions, and the trivalent iron ions are hydrolyzed to form iron hydroxide colloid, gradually forming flocs.

[0083] The electric flocculation tank 25 is provided with an electric flocculation effect by the electric field, and the high-valent flocculation ions such as iron ions and aluminum ions are released. The divalent iron ions produced by the electric flocculation are converted into trivalent iron ions under the action of ozone. These flocculation ions are hydrolyzed to produce hydroxide colloids to flocculate the suspended matter in the liquid. Ozone can oxidize the divalent iron ions produced by the iron plate into trivalent iron ions that are more adaptable to a wider pH range and have better sedimentation properties, thereby avoiding the pH wide range adjustment when the divalent iron ions are used.

[0084] The ultrasonic vibration plate 8 perpendicular to the electro-flocculation electrode assembly 9 generates high-frequency mechanical vibration under the action of the ultrasonic generator 14, so as to form ultrasonic conduction in the water body. The ultrasonic wave generates vibration and mixing in the water body, destroying the high-concentration ion membrane enriched by the electric field polarization on the surface of the electro-flocculation electrode assembly 9, mixing the scaling ions into the water, and diluting the ion enrichment from a microscopic aspect.

[0085] A large amount of gas is blown into the aeration pipe 6 arranged at the bottom of the electro-flocculation tank 25 by the fan 5, and is cut into a large number of tiny bubbles through the aeration pipe 6. The tiny bubbles have a large density difference with water, which generates a large buoyancy force, and the gas-liquid two-phase flow generates squeezing, suction, stirring and other effects. The viscosity generated by the bubbles and the surrounding liquid also makes them a macroscopic rectifier, which floats together and makes a rapid relative motion with the electro-flocculation electrode assembly 9, and forms a convection phenomenon in the electro-flocculation tank, which dilutes the ion enrichment in the macro aspect and reduces the polarization phenomenon on the electrode surface.

[0086] The flotation tank 23 and the electro-flocculation tank 25 are adjacent, and are separated by the middle partition 11 to an appropriate height below the liquid surface. The incoming liquid after electro-flocculation passes over the middle partition 11 from the top of the electro-flocculation tank 25 to the flotation tank 23. At this time, the air dissolved by the air dissolving pump 4 that has not been oxidized into ozone is gradually released to form tiny bubbles, which adhere to the flocs produced by the electro-flocculation, significantly reducing the overall density of the flocs, and quickly float in the water body to reach the top of the liquid. A scraping mechanism 13 is set at the top of the electro-flocculation tank 25 and the flotation tank 23, and the air-floating scum on the top of the liquid is scraped by the scraping mechanism 13 along the scraping inclined plate 18 into the scum tank for external discharge. The water out of the flotation tank is discharged after adjusting the height through the overflow pipe 22 and the overflow plate 17.

[0087] In the description of the present invention, it should be noted that the terms "upper", "lower", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise" and the like indicate directions or positional relationships based on the directions or positional relationships shown in the accompanying drawings. They are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific direction, be constructed and operated in a specific direction. Therefore, they cannot be understood as limitations on the present invention.

[0088] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include at least one of the features. In the description of the present invention, the meaning of "plurality" is at least two, such as two, three, etc., unless otherwise clearly and specifically defined.

[0089] In the present invention, unless otherwise clearly specified and limited, a first feature being "above" or "below" a second feature may mean that the first and second features are in direct contact, or the first and second features are in indirect contact through an intermediate medium. Moreover, a first feature being "above", "above" or "above" a second feature may mean that the first feature is directly above or obliquely above the second feature, or simply means that the first feature is higher in level than the second feature. A first feature being "below", "below" or "below" a second feature may mean that the first feature is directly below or obliquely below the second feature, or simply means that the first feature is lower in level than the second feature.

[0090] In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "example", "specific example", or "some examples" etc. means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described may be combined in any one or more embodiments or examples in a suitable manner. In addition, those skilled in the art may combine and combine the different embodiments or examples described in this specification and the features of the different embodiments or examples, without contradiction.

[0091] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0092] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. An anti-scaling electro-flocculation oxidation flotation device, characterized in that: The invention comprises a tank body (10), an ozone loading system, an electric flocculation electrode assembly (9) and an ultrasonic vibration plate (8); an electric flocculation tank (25) is arranged in the tank body (10); the ozone loading system is connected to the lower part of the electric flocculation tank (25); the electric flocculation electrode assembly (9) is installed in the middle part of the electric flocculation tank (25); and the ultrasonic vibration plate (8) is fixed in the electric flocculation tank (25); It also includes a middle partition (11), wherein the middle partition (11) is vertically fixed in the tank body (10) and divides the lower middle part of the tank body (10) into the electric flocculation tank (25) and the air flotation tank (23); It also includes an overflow pipe (22), one end of which is connected to the lower part of the air flotation tank (23), and the other end of which extends upward; It also includes a drainage hole pipe (24), the side wall of which is provided with a plurality of drainage holes. The drainage hole pipe (24) is horizontally fixed to the lower part of the air flotation tank (23), and one end of the drainage hole pipe is connected to one end of the overflow pipe (22).

2. The anti-scaling electro-flocculation oxidation flotation device according to claim 1, characterized in that: The electro-flocculation electrode assembly (9) comprises at least one group of electrode plates which are parallel to each other and spaced apart. The side wall of the electro-flocculation tank (25) is provided with at least one ultrasonic vibration plate (8), and the ultrasonic vibration plate (8) is perpendicular to the electrode plates.

3. The anti-scaling electro-flocculation oxidation flotation device according to claim 1, characterized in that: The ozone loading system comprises a liquid inlet pipeline (1), an ozone air inlet pipeline (3), an air dissolving pump (4) and a water distributor (7); the liquid inlet pipeline (1) and the ozone air inlet pipeline (3) are respectively connected to a pump liquid inlet and a pump air inlet of the air dissolving pump (4); the pump outlet of the air dissolving pump (4) is connected to the water distributor (7); and the water distributor (7) is fixed to the lower part of the electric flocculation tank (25).

4. The anti-scaling electro-flocculation oxidation flotation device according to claim 1, characterized in that: The invention also includes a scraping mechanism (13), wherein the upper part of the trough body (10) has a slag discharge port (20) connected to the outside of the trough body (10), and the scraping mechanism (13) is fixed to the upper part of the trough body (10) and is used to push the air-floating slag to the slag discharge port (20); and also includes a scraping inclined plate (18), wherein the upper part of the trough body (10) is fixed with a slag trough, and the bottom surface of the slag trough has the slag discharge port (20), and one end of the scraping inclined plate (18) is fixedly connected to the upper edge of the slag trough, and the other end extends toward the scraping mechanism (13) and tilts downward.

5. The anti-scaling electro-flocculation oxidation flotation device according to claim 4, characterized in that: It also comprises a slag guide plate (21), the slag trough is located above the air flotation trough (23), one end of the slag guide plate (21) is fixedly connected to the side wall of the slag trough, and the other end extends toward the scraping mechanism (13) and tilts upward.

6. The anti-scaling electro-flocculation oxidation flotation device according to claim 1, characterized in that: It also includes an overflow trough (16) and an overflow plate (17), wherein the overflow trough (16) is fixed to the upper part of the trough body (10), and the overflow plate (17) is vertically installed in the overflow trough (16) and divides the middle and lower parts of the overflow trough (16) into a first overflow chamber and a second overflow chamber, the other end of the overflow pipe (22) is connected to the first overflow chamber, and the second overflow chamber has a water outlet (19).

7. The anti-scaling electro-flocculation oxidation flotation device according to any one of claims 1 to 6, characterized in that: It also includes a fan (5) and an aeration pipe (6), wherein the aeration pipe (6) is fixed to the lower part of the electric flocculation tank (25), and the fan (5) is connected to the aeration pipe (6).

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