An electrocoagulation ultrasonic coupling wastewater treatment device and its usage method

Abstract

This invention discloses an electrocoagulation-ultrasound-coupled wastewater treatment device, comprising a reaction tank with an inlet on one side and an outlet on the other. Several anode plates and cathode plates, arranged in an alternating pattern, are submerged within the reaction tank. The anode plates are connected to the positive terminal of a power source, and the cathode plates are connected to the negative terminal. The device also includes an ultrasonic device disposed on the inner wall and bottom of the reaction tank. This electrochemical-ultrasound-coupled wastewater treatment device utilizes the cavitation effect and vibration acceleration of ultrasound to reduce concentration polarization in the electrocoagulation reaction. The ultrasonic cleaning action removes the passivation layer from the electrode surface, while the microbubbles generated by electrocoagulation provide dissolved gas for the ultrasonic cavitation effect, improving the ultrasonic treatment efficiency. The coupled use of these two technologies mutually stimulates the electrocoagulation reaction and ultrasonic action, significantly improving wastewater treatment efficiency and reducing energy consumption.

Description

Technical Field

[0001] This invention relates to the field of wastewater treatment technology, specifically to an electrocoagulation ultrasonic coupling wastewater treatment device and its usage method. Background Art

[0002] With the continuous development of global industrial technology and the increasing stringency of water quality standards and discharge requirements, the field of water resource regeneration and ecological environmental protection worldwide is facing unprecedented challenges posed by wastewater generated from industrial production and daily life. Currently, the traditional wastewater treatment process, primarily based on sedimentation, flotation, and biological treatment, is increasingly unable to meet wastewater discharge and reuse requirements, nor can it achieve wastewater resource utilization. Therefore, considering the characteristics of wastewater—large fluctuations in volume, wide pollution range, complex pollution conditions, difficulties in biological treatment, and the long process flow, poor effluent quality, and large land area required by traditional wastewater treatment methods—this invention conducts experimental research on the electrocoagulation process for wastewater treatment.

[0003] Electrocoagulation is one of the main electrochemical wastewater treatment technologies, possessing advantages such as wide applicability, short reaction time, stable and easily separated flocs, low sludge production, and no secondary pollution. Electrocoagulation technology generally uses Al (aluminum) as a soluble anode, which is generated under the action of an external electric field. 3+ The cationic particles further hydrolyze and polymerize into hydroxides and polynuclear hydroxyl complexes, which can coagulate colloidal pollutants. Simultaneously, during electrocoagulation, hydrogen bubbles with a diameter of 10–30 micrometers are released at the cathode, and oxygen bubbles with a diameter of 20–60 micrometers are released at the anode. These microbubbles, as they rise, can lift the flocs to the surface. Through coagulation and flotation, pollutant separation and water purification are achieved.

[0004] However, two problems are often encountered in practical applications: concentration polarization and electrode passivation. These are the main reasons for high energy consumption and reduced treatment speed. Concentration polarization occurs because the concentration of wastewater near the electrode plate (approximately 100 micrometers) differs from that far from the electrode plate. Under a certain current density, the operating voltage must be increased to overcome the concentration polarization effect, leading to a significant increase in the energy consumption of electrocoagulation. Furthermore, alumina, a byproduct generated during electrocoagulation, easily deposits on the electrode surface, causing passivation, inhibiting electrode discharge, and resulting in a decrease in electrode conductivity, thus significantly reducing the efficiency of electrochemical wastewater treatment.

[0005] In view of the above, it is necessary to propose an electrocoagulation ultrasonic coupling wastewater treatment device and its usage method to solve the above problems. Summary of the Invention

[0006] The purpose of this invention is to solve the above-mentioned technical problems by providing an electrocoagulation ultrasonic coupling wastewater treatment device and its usage method.

[0007] To achieve the above objectives, the present invention adopts the following technical solution: an electrocoagulation ultrasonic coupling wastewater treatment device, comprising a reaction tank, an inlet on one side of the reaction tank and an outlet on the other side, wherein a plurality of anode plates and cathode plates are submerged in the reaction tank and arranged in an alternating manner, wherein the anode plates are connected to the positive terminal of a power supply and the cathode plates are connected to the negative terminal of a power supply; and further comprising an ultrasonic device, wherein the ultrasonic device is disposed on the inner wall and bottom of the reaction tank.

[0008] Furthermore, the upper part of the reaction tank is also provided with a slag scraping device, which includes a transmission chain that is arranged to circulate above the reaction tank, and a number of scrapers are evenly spaced on the transmission chain.

[0009] Furthermore, the spacing between the anode plate and the cathode plate is adjustable, and the reaction tank is provided with an anode guide rod and a cathode guide rod. Each anode plate is slidably connected to the anode guide rod, and each cathode plate is slidably connected to the cathode guide rod.

[0010] Furthermore, the anode plate has a first sliding sleeve on its left and right opposite sides, and the anode plate is slidably connected to the anode guide rod through the first sliding sleeve; the cathode plate has a second sliding sleeve on its upper and lower opposite sides, and the cathode plate is slidably connected to the cathode guide rod through the second sliding sleeve; it also includes stepped wedges inserted between adjacent anode plates and cathode plates, a plurality of stepped wedges are arranged on the through rod, the stepped wedges are arranged in an inverted triangular shape, and steps are provided on their two inclined surfaces, and the stepped wedges are made of insulating material.

[0011] Furthermore, the cathode guide rod is connected to the lifting slider at both ends, the inner wall of the reaction tank is provided with a guide rail longitudinally, the lifting slider is slidably connected in the guide rail, the lifting slider has a long strip structure, a spring is provided between the lower end of the lifting slider and the bottom wall of the reaction tank, the upper end of the lifting slider extends out of the sewage water surface, the reaction tank is provided with a cam drive mechanism, the cam drive mechanism includes a reduction motor and a drive cam, the reduction motor is provided on the reaction tank, the output end of the reduction motor is provided with a drive cam, and the drive cam forms a cam engagement with the top end of the lifting slider.

[0012] Furthermore, the inner wall of the reaction tank is provided with extrusion cylinders at both ends, and the free end of the extrusion cylinder is provided with a pressure plate. The extrusion cylinders on both sides extrude several anode plates and cathode plates towards the center.

[0013] Furthermore, the reaction tank is also equipped with baffles, which are disposed between the side of the electrode plate and the inner wall of the reaction tank. The baffles are staggered on both sides of the electrode plate, so that the sewage moves laterally through the gap between the electrode plates and flows in an S-shaped zigzag pattern within the reaction tank.

[0014] Furthermore, the spacing between adjacent anode and cathode plates is 10-20 mm, and the electrocoagulation current density is controlled at 5-10 A / m. 2 The reaction time of the wastewater in the reaction tank is controlled at 10-15 minutes.

[0015] A method of using an electrocoagulation ultrasonic coupling wastewater treatment device, wherein wastewater flows into a reaction tank from the inlet, and the wastewater enters the reaction tank from the inlet, immersing the anode plate, cathode plate and ultrasonic generator.

[0016] Restart the dual-pulse power supply to energize the anode and cathode plates, and control the electrocoagulation current density to 5–10 A / m. 2 Simultaneously turn on the ultrasonic generator and control the ultrasonic frequency to 25000-50000Hz; adjust the ultrasonic power to 50-100W / L according to the water volume in the reaction tank; control the reaction time of the wastewater in the reaction tank to 10-15min.

[0017] Furthermore, turn off the power, lift the through rod to remove the step wedge block's restriction on the electrode spacing; control the extension of the extrusion cylinders at both ends to push the stacked electrode plates from both ends toward the middle so that the anode plate and cathode plate fit together; start the reduction motor and drive the cam to extrude the lifting slider, causing the cathode guide rod to move up and down, so that the anode plate and cathode plate move relative to each other.

[0018] Compared with existing technologies, the beneficial effects of this invention are as follows: The electrocoagulation ultrasonic coupling wastewater treatment device of this invention is equipped with an ultrasonic device. Utilizing the strong cavitation, vibration acceleration, and direct flow effects of ultrasound in liquids, the dirt layer can be dispersed, emulsified, and peeled off to achieve the cleaning purpose. During the wastewater treatment process, the high energy generated by the collapse of ultrasonic cavitation bubbles produces hydroxyl and hydrogen radicals, which react with organic matter to transform harmful organic matter in the water into CO2, H2O, inorganic ions, or organic matter that is less toxic and more easily degraded than the original organic matter. This effectively overcomes the problems of concentration polarization and electrode passivation in wastewater treatment. Attached Figure Description

[0019] Figure 1 This is a schematic diagram of the structure of an electrocoagulation ultrasonic coupling wastewater treatment device according to the present invention;

[0020] Figure 2 for Figure 1 Top view of the cross-section of the intermediate reaction tank;

[0021] Figure 3 This is an isometric view of the electrocoagulation ultrasonic coupling wastewater treatment device of the present invention;

[0022] Figure 4 This is an exploded view of the electrocoagulation ultrasonic coupling wastewater treatment device of the present invention;

[0023] Figure 5 This is a longitudinal cross-sectional view of the electrocoagulation ultrasonic coupling wastewater treatment device of the present invention;

[0024] In the diagram: 1. Reaction tank; 2. Inlet; 3. Outlet; 4. Anode plate; 5. Cathode plate; 6. Power supply; 7. Ultrasonic device; 8. Sludge scraper; 9. Transmission chain; 10. Scraper; 11. Anode guide rod; 12. Cathode guide rod; 13. First sliding sleeve; 14. Second sliding sleeve; 15. Stepped wedge; 16. Through rod; 17. Lifting slider; 18. Guide rail; 19. Spring; 20. Cam drive mechanism; 21. Gear motor; 22. Drive cam; 23. Extrusion cylinder; 24. Pressure plate; 25. Baffle plate. DETAILED DESCRIPTION

[0025] The technical solution of the present invention will be clearly and completely described below with reference to the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments.

[0026] An electrocoagulation ultrasonic coupling wastewater treatment device, such as Figure 1 As shown, the reaction tank includes a reaction vessel 1 with an inlet 2 on one side and an outlet 3 on the other side. Wastewater enters the reaction vessel 1 through the inlet 2. Several anode plates 4 and cathode plates 5 are submerged in the reaction vessel 1 and arranged in an alternating pattern. The anode plates 4 are connected to the positive terminal of a power supply 6, and the cathode plates 5 are connected to the negative terminal of the power supply 6. The power supply 6 is a dual-pulse power supply 6. Each anode plate 4 is connected in parallel to the positive terminal of the power supply 6, and similarly, the cathode plates 5 are connected in parallel to the negative terminal of the power supply 6. Activating the dual-pulse power supply 6 energizes the anode plates 4 and cathode plates 5, causing an electrocoagulation reaction within the reaction vessel 1. The electrocoagulation current density is controlled to be 5–10 A / m³. 2 Electrocoagulation is one of the main electrochemical wastewater treatment technologies, possessing advantages such as wide applicability, short reaction time, stable and easily separated flocs, low sludge production, and no secondary pollution. However, its high energy consumption and the decrease in treatment rate due to electrode passivation limit its widespread application. Electrocoagulation technology generally uses Al (aluminum) as a soluble anode, which generates Al under the action of an external electric field. 3+The cationic particles further hydrolyze and polymerize into hydroxides and polynuclear hydroxyl complexes, which can coagulate colloidal pollutants. Simultaneously, during electrocoagulation, hydrogen bubbles with a particle size of 10–30 micrometers are released at the cathode, and oxygen bubbles with a particle size of 20–60 micrometers are released at the anode. These microbubbles, as they rise, can lift the flocs to the surface, achieving pollutant separation and water purification through coagulation and flotation. At this point, electrocoagulation occurs in reaction tank 1, and the anode plate 4 undergoes metal corrosion. Accompanied by hydrolysis, polymerization, and electrolysis, a large number of suspended flocs and microbubbles are generated. Some of the microbubbles dissolve in the water, while others are adsorbed onto the floc surface, causing the flocs to float and become scum.

[0027] A slag scraping device 8 is also provided at the upper part of the reaction tank 1. The slag scraping device 8 includes a transmission chain 9 that circulates above the reaction tank 1, and a number of scrapers 10 are evenly spaced on the transmission chain 9. Driven by the transmission chain 9, each scraper 10 transports the slag floating above the reaction tank 1, thereby separating the slag from the water and purifying the wastewater.

[0028] Concentration polarization and electrode passivation are the main causes of high energy consumption and reduced treatment speed. Concentration polarization occurs because the concentration of wastewater near the electrode plate (approximately 100 micrometers) differs from that farther away. Under a given current density, the operating voltage must be increased to overcome this concentration polarization effect, leading to a significant increase in the energy consumption of electrocoagulation. Furthermore, the alumina byproduct generated during electrocoagulation easily deposits on the electrode surface, causing passivation, inhibiting electrode discharge, and resulting in decreased electrode conductivity, thus significantly reducing the efficiency of electrochemical wastewater treatment.

[0029] To overcome the effects of concentration polarization and electrode passivation on electrocoagulation, this device is also equipped with an ultrasonic device 7, such as... Figure 1As shown, the ultrasonic device 7 is installed on the inner wall and bottom of the reaction tank 1. Ultrasonic waves can be used as a cleaning technology and also as a wastewater treatment technology. Ultrasonic cleaning utilizes the strong cavitation effect, vibration acceleration, and direct flow of ultrasound waves in liquids to disperse, emulsify, and peel off the dirt layer, achieving the cleaning purpose. Ultrasonic wastewater treatment mainly utilizes the cavitation effect and free radical oxidation principle of ultrasound waves to degrade harmful organic matter in wastewater. During wastewater treatment, the high energy generated by the collapse of ultrasonic cavitation bubbles produces hydroxyl and hydrogen radicals, which react with organic matter to oxidize it, transforming harmful organic matter in the water into CO2, H2O, inorganic ions, or organic matter that is less toxic and more easily degradable than the original organic matter. Therefore, organic pollutants that are difficult to treat by biological degradation in traditional wastewater treatment can be degraded through the cavitation effect of ultrasound. However, the amount of naturally dissolved gas in wastewater is very small, and insufficient dissolved gas leads to an insignificant cavitation effect, resulting in low efficiency of ultrasonic wastewater treatment and restricting the application of ultrasonic technology in the field of wastewater treatment. This invention utilizes the cavitation and cleaning effects of ultrasound, along with the flocculation and flotation effects generated by electrocoagulation, to mutually stimulate the electrocoagulation reaction and the ultrasonic action, thereby significantly improving wastewater treatment efficiency and effectively reducing energy consumption.

[0030] Electrocoagulation occurs between the anode plate 4 and the cathode plate 5 in reaction tank 1. Simultaneously, ultrasound induces strong cavitation, causing dissolved microbubbles in the water to continuously break and collapse. This causes strong vibrations in the water flow near the anode plate 4 and cathode plate 5, resulting in friction between the water and the electrode plates. On the one hand, this accelerates the dissolution of the electrode plates, increasing the number of flocs. On the other hand, it accelerates the mixing of water near the electrode plates, reducing concentration polarization and ensuring that the electrocoagulation reaction can always operate stably at a lower voltage. In addition, active oxidizing substances are generated, causing pollutants in the water to undergo oxidation-reduction reactions and transform into non-pollutants.

[0031] In order to thoroughly purify the wastewater in reaction tank 1, such as Figure 2 As shown, the reaction tank 1 is also equipped with baffles 25, which are disposed between the side of the electrode plates and the inner wall of the reaction tank 1. The baffles 25 are staggered on both sides of the electrode plates. Baffles 25 are disposed at intervals between multiple anode plates 4 and cathode plates 5. In this area, the wastewater between the multiple electrode plates flows in the same direction. Figure 2 As shown by the dashed line, when the wastewater encounters the next baffle plate 25, it is redirected, causing the wastewater to move laterally through the gap between the electrodes and flow in an S-shaped zigzag pattern within the reaction tank 1. This increases the residence time of the wastewater between the electrodes, allowing for more thorough treatment. Secondly, the scouring effect created by the lateral movement of the wastewater between the electrodes can wash away the byproducts deposited on the electrode surface, thus cleaning the electrode surface and effectively inhibiting passivation.

[0032] The electrochemical-ultrasonic coupled wastewater treatment device proposed in this invention utilizes the cavitation effect and vibration acceleration of ultrasound to reduce concentration polarization in the electrocoagulation reaction. The ultrasonic cleaning action removes the passivation layer from the electrode surface, while the microbubbles generated by electrocoagulation provide dissolved gas for the ultrasonic cavitation effect, thus improving the ultrasonic treatment efficiency. The coupled use of these two technologies mutually stimulates the electrocoagulation reaction and ultrasonic action, significantly improving wastewater treatment efficiency and reducing energy consumption.

[0033] like Figure 3-5 As shown, the spacing between the anode plate 4 and the cathode plate 5 is adjustable. The reaction tank 1 is provided with an anode guide rod 11 and a cathode guide rod 12. Each anode plate 4 is slidably connected to the anode guide rod 11, and each cathode plate 5 is slidably connected to the cathode guide rod 12.

[0034] Specifically, the anode plate 4 has first sliding sleeves 13 on its left and right opposite sides, such as... Figure 4 As shown, four first sliding sleeves 13 are distributed on both sides of the anode plate 4. The anode plate 4 is slidably connected to the anode guide rod 11 through the first sliding sleeves 13. Four anode guide rods 11 are also provided in the reaction tank 1 to allow the anode plate 4 to slide freely laterally. Similarly, second sliding sleeves 14 are provided on the upper and lower opposite sides of the cathode plate 5. The cathode plate 5 is slidably connected to the cathode guide rod 12 through the second sliding sleeves 14.

[0035] In actual use, the distance between adjacent anode plates 4 and cathode plates 5 is 10-20mm, and the distance can be changed as needed. Specifically, it also includes stepped wedges 15 inserted between adjacent anode plates 4 and cathode plates 5. Multiple stepped wedges 15 are arranged on the through rod 16. The stepped wedges 15 are arranged in an inverted triangular shape, with steps on both sides of their inclined surfaces. The stepped wedges 15 are made of insulating material. Figure 3 As shown, in this embodiment, in order to arrange two adjacent electrode plates as close as possible, stepped wedges 15 are respectively arranged on two through rods 16, and stepped wedges 15 are respectively arranged on the two through rods 16, so that the stepped wedges 15 on the two through rods 16 are staggered. The ends of the two through rods 16 are respectively arranged on the sliders on the inner wall of the reaction tank 1. In actual use, the sliders on both sides can be raised and lowered by electric control. Figure 5 As shown, since the sidewall of the stepped wedge 15 is stepped, it can limit the distance between the plates at different intervals. In use, it can prevent the flow of sewage from changing the distance between the plates. In actual use, it is advisable to set the stepped wedge 15 on at least two opposite sides of the plates so that the plates are kept parallel under force. The lower stepped wedge 15 is not shown in this embodiment.

[0036] Furthermore, in this embodiment, the anode plate 4 can move axially along the anode guide rod 11, and the cathode plate 5 can also move axially along the cathode guide rod 12; however, the cathode plate 5 can also reciprocate within a certain range in the vertical direction, thereby creating relative movement between the cathode plate 5 and the anode plate 4. This relative movement causes friction between the surfaces of the cathode plate 5 and the anode plate 4, thus cleaning the surface of the plates more thoroughly. Specifically, as... Figure 4 As shown, the cathode guide rod 12 is connected to the lifting slider 17 at both ends. The inner wall of the reaction tank 1 is provided with a guide rail 18 in the longitudinal direction. The lifting slider 17 is slidably connected in the guide rail 18. The lifting slider 17 has a long strip structure. A spring 19 is provided between the lower end of the lifting slider 17 and the bottom wall of the reaction tank 1. Under the action of the spring 19, the lifting slider 17 is lifted upward. The upper end of the lifting slider 17 extends out of the sewage water surface. A cam drive mechanism 20 is provided on the reaction tank 1. The cam drive mechanism 20 is used to press downward. This controls the overall up and down movement of the cathode plate 5. Specifically, the cam drive mechanism 20 includes a reduction motor 21 and a drive cam 22. The reduction motor 21 is provided on the reaction tank 1. The output end of the reduction motor 21 is provided with a drive cam 22. The drive cam 22 forms a cam engagement with the top end of the lifting slider 17. The reaction tank 1 has compression cylinders 23 at both ends of its inner wall. Each compression cylinder 23 has a pressure plate 24 at its free end. The compression cylinders 23 on both sides compress several anode plates 4 and cathode plates 5 towards the center. In actual use, the compression cylinders 23 work together to push the anode plates 4 and cathode plates 5 towards the center, making them fit together. It is understood that during cleaning, the power supply 6 needs to be turned off and the stepped wedge block 15 lifted. Then, the cam drive mechanism 20 is activated. If multiple cam drive mechanisms 20 are provided as shown in the attached diagram, they need to be set to rotate synchronously to control the synchronous lifting and lowering of each lifting slider 17. The rotation of the reduction motor 21 controls the rotation of the drive cam 22 at its end. When the cam dome of the drive cam 22 is at the top of the lifting slider 17, it pushes the lifting slider 17 downwards, causing the cathode plate 5 to move downwards relative to the anode plate 4, resulting in friction between them and achieving a surface cleaning effect.

[0037] A method for using an electrocoagulation ultrasonic coupling wastewater treatment device involves allowing wastewater to flow into a reaction tank 1 through inlet 2. The wastewater enters the reaction tank 1 through the inlet, immersing the anode plate 4, cathode plate 5, and ultrasonic generator. A dual-pulse power supply 6 is then activated, energizing the anode plate 4 and cathode plate 5, controlling the electrocoagulation current density to 5–10 A / m². Simultaneously, the ultrasonic generator is turned on, controlling the ultrasonic frequency to 25000–50000 Hz. The ultrasonic power is adjusted to 50–100 W / L based on the water volume in the reaction tank 1. The reaction time of the wastewater in the reaction tank 1 is controlled to 10–15 minutes. The alumina passivation layer continuously generated on the surface of the anode plate 4, under the strong cavitation and vibration acceleration induced by the ultrasonic waves, detaches from the electrode surface and undergoes hydrolysis and polymerization reactions, forming flocs. This avoids the attenuation of the electrode plate's conductivity caused by the passivation layer.

[0038] Pollutants in the water are purified through the combined action of electrocoagulation and ultrasound, resulting in two parts: scum and clean water. The scum is discharged through the scum scraper 8 at the top of the reaction tank 1, while the clean water is discharged from the outlet at the bottom of the reaction tank 1.

[0039] When it is necessary to clean the surface of the electrode plate, the power supply 6 needs to be turned off, the through rod 16 is lifted, and the step wedge block 15 is removed from limiting the distance between the electrode plates. The extrusion cylinders 23 at both ends are extended to push the stacked electrode plates from both ends toward the middle so that the anode plate 4 and the cathode plate 5 are in contact with each other. The reduction motor 21 is started and the lifting slider 17 is squeezed by the drive cam 22 to make the cathode guide rod 12 move up and down, so that the anode plate 4 and the cathode plate 5 move relative to each other.

[0040] When treating the same type of municipal wastewater, the initial biochemical oxygen demand is 400 mg / L.

[0041] Example: Using the solution described in this patent, at a current density of 8A / m 2 With an ultrasonic frequency of 40,000 Hz and a treatment time of 15 minutes, the biochemical oxygen demand (BOD) can be reduced to 60 mg / L, meeting the requirements of GB 18918-2002 "Discharge Standard of Pollutants for Municipal Wastewater Treatment Plants". The comprehensive power consumption per ton of water treated is 8 kWh.

[0042] Comparative Example 1: Using existing electrocoagulation technology, a current density of 20 A / m³ is required. 2 At this temperature, the treatment time is 30 minutes, and the biochemical oxygen demand (BOD) can be reduced to 60 mg / L. The comprehensive power consumption for treating one ton of water is 15 kWh.

[0043] Comparative Example 2: Using existing ultrasonic technology, with an ultrasonic frequency of 50,000 Hz and a treatment time of 30 min, the biochemical oxygen demand (BOD) could only be reduced to 150 mg / L. As the treatment time was extended, the reduction in BOD gradually slowed down and could not be reduced to 60 mg / L.

[0044] Comparative Example 3: Simply connecting an existing electrocoagulation device in series with an ultrasonic device requires a current density of 15 A / m 2 An ultrasonic frequency of 50,000 Hz, with electrocoagulation and ultrasonic treatment each lasting 30 minutes, for a total treatment time of 60 minutes, is required to reduce the biochemical oxygen demand to 60 mg / L. The comprehensive power consumption per ton of water treated is 20 kWh.

[0045] The results are compared in the table below:

[0046]

[0047]

[0048] Compared with existing electrocoagulation methods, the solution described in this patent has lower overall power consumption and shorter processing time under the same influent and effluent conditions.

[0049] By comparing the solution described in this patent with existing ultrasonic methods, it can be found that under the same water inlet conditions, the solution described in this patent can achieve the water quality standard requirements in real time with lower ultrasonic power and frequency, while existing ultrasonic methods, which use higher power and frequency, can never achieve the water quality standard requirements.

[0050] A simple comparison between the solution described in this patent and existing electrocoagulation devices and ultrasonic devices in series reveals that, under the same influent and effluent conditions, the solution described in this patent has lower overall power consumption and shorter processing time.

[0051] In summary, the solution described in this patent is faster and consumes less energy than existing electrocoagulation and ultrasonic treatments. Furthermore, in the solution described in this patent, electrocoagulation and ultrasonication are not simply superimposed, but rather mutually reinforcingly coupled.

[0052] The above description is only a preferred embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any equivalent substitutions or modifications made by those skilled in the art within the scope of the technology disclosed in the present invention, based on the technical solution and inventive concept of the present invention, should be covered within the scope of protection of the present invention.

Claims

1. An electrocoagulation ultrasonic coupling wastewater treatment device, comprising a reaction tank (1), an inlet (2) on one side of the reaction tank (1) and an outlet (3) on the other side, characterized in that, The reaction tank (1) is submerged with a number of anode plates (4) and cathode plates (5) arranged in an alternating manner. The anode plates (4) are connected to the positive terminal of the power supply (6), and the cathode plates (5) are connected to the negative terminal of the power supply (6). The reaction tank (1) also includes an ultrasonic device (7), which is installed on the inner wall and bottom of the reaction tank (1). The spacing between the anode plate (4) and the cathode plate (5) is adjustable. The reaction tank (1) is provided with an anode guide rod (11) and a cathode guide rod (12). Each anode plate (4) is slidably connected to the anode guide rod (11), and each cathode plate (5) is slidably connected to the cathode guide rod (12). The anode plate (4) is provided with a first sliding sleeve (13) on its left and right opposite sides, and the anode plate (4) is slidably connected to the anode guide rod (11) through the first sliding sleeve (13); the cathode plate (5) is provided with a second sliding sleeve (14) on its upper and lower opposite sides, and the cathode plate (5) is slidably connected to the cathode guide rod (12) through the second sliding sleeve (14); it also includes a stepped wedge (15) inserted between adjacent anode plates (4) and cathode plates (5), a plurality of the stepped wedges (15) are set on the through rod (16), the stepped wedges (15) are set in an inverted triangular shape, and steps are set on the inclined surfaces on both sides, and the stepped wedges (15) are made of insulating material; The cathode guide rod (12) is connected to the lifting slider (17) at both ends. The inner wall of the reaction tank (1) is provided with a guide rail (18) in the longitudinal direction. The lifting slider (17) is slidably connected in the guide rail (18). The lifting slider (17) has a long strip structure. A spring (19) is provided between the lower end of the lifting slider (17) and the bottom wall of the reaction tank (1). The upper end of the lifting slider (17) extends out of the sewage water surface. A cam drive mechanism (20) is provided on the reaction tank (1). The cam drive mechanism (20) includes a reduction motor (21) and a drive cam (22). The reduction motor (21) is provided on the reaction tank (1). The output end of the reduction motor (21) is provided with a drive cam (22). The drive cam (22) and the top end of the lifting slider (17) form a cam engagement. The reaction tank (1) has extrusion cylinders (23) at both ends of its inner wall. The free end of the extrusion cylinder (23) is equipped with a pressure plate (24). The extrusion cylinders (23) on both sides extrude several anode plates (4) and cathode plates (5) towards the center.

2. The electrocoagulation ultrasonic coupling wastewater treatment device according to claim 1, characterized in that, The upper part of the reaction tank (1) is also provided with a slag scraping device (8), which includes a transmission chain (9) that is arranged above the reaction tank (1) and rotates in a circular manner. Several scrapers (10) are evenly spaced on the transmission chain (9).

3. The electrocoagulation ultrasonic coupling wastewater treatment device according to claim 2, characterized in that, The reaction tank (1) is also provided with baffles (25). The baffles (25) are arranged between the side of the electrode plate and the inner wall of the reaction tank (1). The baffles (25) are arranged alternately on both sides of the electrode plate, so that the sewage moves laterally through the gap between the electrode plates and flows in an S-shaped folding pattern in the reaction tank (1).

4. The electrocoagulation ultrasonic coupling wastewater treatment device according to claim 1, characterized in that, The distance between adjacent anode plates (4) and cathode plates (5) is 10-20 mm, and the electrocoagulation current density is controlled at 5-10 A / m. 2 The reaction time of the wastewater in the reaction tank (1) is controlled at 10~15min.

5. The method of using the electrocoagulation ultrasonic coupling wastewater treatment device according to any one of claims 1-4, characterized in that, Wastewater flows into the reaction tank (1) from the inlet (2). Wastewater enters the reaction tank (1) from the inlet and submerges the anode plate (4), cathode plate (5) and ultrasonic generator. Restart the dual-pulse power supply (6) to energize the anode plate (4) and cathode plate (5), and control the electrocoagulation current density to 5~10 A / m. 2 At the same time, turn on the ultrasonic generator and control the ultrasonic frequency to 25000~50000Hz; adjust the ultrasonic power to 50~100W / L according to the water volume in the reaction tank (1); control the reaction time of the sewage in the reaction tank (1) to 10~15min. Turn off the power (6), lift the through rod (16) to remove the step wedge block (15) from limiting the distance between the plates; control the extrusion cylinders (23) at both ends to extend and push the stacked plates from both ends toward the middle so that the anode plate (4) and the cathode plate (5) fit together; start the reduction motor (21) and squeeze the lifting slider (17) through the drive cam (22) to make the cathode guide rod (12) move up and down, so that the anode plate (4) and the cathode plate (5) move relative to each other.

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