Electrocatalytic oxidation device

Abstract

The application provides an electro-catalytic oxidation device, and relates to the technical field of sewage treatment systems.The electro-catalytic oxidation device comprises a reaction cavity, a foam removing mechanism and an electrode group, the electrode group is arranged in the reaction cavity, the foam removing mechanism comprises a blowing device, a collecting groove is arranged on at least one side above the reaction cavity, and the blowing device is used for blowing the foam on the liquid surface into the collecting groove.The electro-catalytic oxidation device provided by the application blows the foam on the liquid surface into the collecting groove through the blowing device, so that the foam is removed in the air, the complexity of the top equipment is reduced, the corrosion of the foam on the electrode plate and the connecting part is avoided, and the service life of the electrode plate is prolonged.

Description

Technical Field

[0001] This invention relates to the field of wastewater treatment system technology, and in particular to an electrocatalytic oxidation device. Background Technology

[0002] Electrocatalytic oxidation is a catalytic oxidation technology based on electrochemical reactions. When an electric current passes through wastewater containing organic pollutants, the generated electrons initiate an oxidation reaction at the anode, converting the organic pollutants into harmless substances.

[0003] Electrocatalytic oxidation technology can treat many different types of wastewater, including industrial wastewater, municipal sewage, and agricultural and livestock wastewater. It can effectively remove organic pollutants and reduce the content of nutrients such as nitrogen and phosphorus in wastewater, thereby mitigating the impact on the aquatic ecosystem.

[0004] Electrocatalytic oxidation devices generate a large amount of foam during operation, which affects the normal progress of electrolysis. Traditionally, contact foam removal equipment is used to scrape off the foam, which greatly increases the complexity of the top equipment, and the scraping effect of the scraper is not good. Summary of the Invention

[0005] The purpose of this invention is to provide an electrocatalytic oxidation device to solve the problems existing in the prior art, simplify the equipment, and improve the foam removal effect.

[0006] To achieve the above objectives, the present invention provides the following solution:

[0007] The present invention provides an electrocatalytic oxidation device, including a reaction chamber, a foam removal mechanism and an electrode assembly. The electrode assembly is disposed in the reaction chamber. The foam removal mechanism includes an air blowing device and a collection tank is provided on at least one side above the reaction chamber. The air blowing device is used to blow foam on the liquid surface into the collection tank.

[0008] Preferably, a filter screen is provided at the inlet of the collection tank, and the filter screen is used to liquefy the foam entering the collection tank.

[0009] Preferably, it also includes a pretreatment device for pretreating the wastewater before discharging it into the reaction chamber, and the collection tank is connected to the inlet of the pretreatment device.

[0010] Preferably, the device further includes a gas recovery device, which includes a gas collection hood and a tail gas separation device. The gas collection hood is located above the reaction chamber, and the gas collection hood and the tail gas separation device are connected. The tail gas separation device is used to separate and store the collected gas separately.

[0011] Preferably, the electrode assembly includes anode plates and cathode plates arranged in a cross configuration, with spacers provided in the gaps between adjacent anode plates and cathode plates.

[0012] Preferably, it further includes a magnetic stirring device, wherein the stirring head of the magnetic stirring device is located at the bottom of the reaction chamber, and the driving device of the magnetic stirring device is located outside the reaction chamber and below the reaction chamber.

[0013] Preferably, an ultrasonic oscillator is provided at the bottom of the reaction chamber;

[0014] It also includes a cooling system, in which the wastewater treated by the pretreatment equipment is first discharged into the cooling system for cooling before being discharged into the reaction chamber.

[0015] Preferably, the electrode plates of the electrode assembly are arranged sequentially along the length of the reaction chamber, and two reflux channels are formed between the electrode assembly and the side of the reaction chamber in the width direction. The area between the two reflux channels forms a main channel, and the two ends of the main channel are connected to the two ends of the reflux channels. A submersible mixer is provided at the water inlet end of the reflux channel. The submersible mixer is used to drive the water at the water inlet end of the reflux channel toward the water outlet end. The water outlet end of the reflux channel is connected to the water inlet end of the main channel.

[0016] Preferably, an equalization tank, a sedimentation tank, and an effluent storage tank are provided on one side of the reaction chamber. An effluent outlet is provided at or near the end of the reaction chamber and is connected to the equalization tank. An automatic pH dosing device is provided above the equalization tank. The equalization tank, the sedimentation tank, and the effluent storage tank are connected in sequence, and the effluent storage tank is connected to the inlet of the next unit.

[0017] Preferably, the effluent storage tank can also be connected to the inlet of the pretreatment equipment.

[0018] The present invention achieves the following technical effects compared to the prior art:

[0019] The electrocatalytic oxidation device provided by this invention blows the foam on the liquid surface into the collection tank through an air blowing device, thereby achieving the effect of removing foam in the air, reducing the complexity of the top equipment, avoiding the corrosion of the electrode plates and connections by the foam, and increasing the service life of the electrode plates. Attached Figure Description

[0020] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0021] Figure 1 A top view of the electrocatalytic oxidation apparatus provided in an embodiment of the present invention;

[0022] Figure 2 A front view of the electrocatalytic oxidation apparatus provided in an embodiment of the present invention;

[0023] Figure 3 A side view of the electrocatalytic oxidation apparatus provided in an embodiment of the present invention;

[0024] Figure 4 A side view of the electrode plate, aeration pipe, and support provided in an embodiment of the present invention;

[0025] Figure 5 for Figure 4 The front view;

[0026] Figure 6 This is a schematic diagram of the structure of two aeration pipes;

[0027] Figure 7 This is a schematic diagram of the water distributor.

[0028] Figure 8 This is a cross-sectional view of sedimentation tank one;

[0029] Figure 9 This is a cross-sectional view of sedimentation tank two;

[0030] Figure 10 This is a schematic diagram showing the direction of water flow.

[0031] In the diagram: 1-Pretreatment equipment; 2-Reaction chamber; 3-Inlet pump; 4-Cooling system; 5-Collection tank; 6-Submersible mixer; 7-Magnetic stirring device; 8-Ultrasonic vibrator; 9-Water distributor; 10-Separator; 11-Baffle; 12-Foam liquefaction return pipe; 13-Sedimentation tank one; 14-Equalization tank; 15-Sedimentation tank two; 16-Effluent storage tank; 17-Water distribution overflow weir; 18-External circulation pump; 19-Inclined plate; 20-Effluent Overflow weir; 21-Outlet pipe; 22-Sludge collection well; 23-Gas collection hood; 24-Tail gas separation device; 25-Hydrogen outlet; 26-Chlorine outlet; 27-Waste gas outlet; 28-Electrode plate; 30-Top partition; 31-Filter screen; 32-Automatic pH dosing device; 33-Top horizontal plate; 34-Aeration pipe; 35-Cathode plate; 36-Anode plate; 37-Blowing hole; 38-Sedimentation tank side water passage hole; 39-Outlet. Detailed Implementation

[0032] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0033] The purpose of this invention is to provide an electrocatalytic oxidation device to solve the problems existing in the prior art, simplify the equipment, and improve the foam removal effect.

[0034] To make the above-mentioned objects, features and advantages of the present invention more apparent and understandable, the present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments.

[0035] This invention provides an electrocatalytic oxidation device, such as... Figures 1-10 As shown, it includes a reaction chamber 2, a foam removal mechanism, and an electrode assembly. The electrode assembly is located inside the reaction chamber 2. The reaction chamber 2 is used to contain the fluid to be treated. The foam removal mechanism includes an air blowing device. At least one side above the reaction chamber 2 is provided with a collection tank 5. The air blowing device is used to blow the foam on the liquid surface into the collection tank 5.

[0036] Preferably, a collection trough 5 is provided on both opposite sides of the reaction chamber 2, and the actuation structure of the air blowing device is located in the middle of the upper part of the reaction chamber 2, and can blow air towards both sides respectively.

[0037] The air source for the air blowing device can be a high-pressure tank or an air pump. The actuator is an aeration pipe 34, which has air blowing holes 37. One aeration pipe 34 can be installed, with a row of air blowing holes 37 on each side of the aeration pipe 34. Alternatively, two aeration pipes 34 can be installed, with the two aeration pipes 34 arranged in parallel, and a row of air blowing holes 37 on each side that is far apart from each other.

[0038] The collection tank 5 is a tank separated from one side of the reaction chamber 2 by a plate-like structure (e.g., top partition 30). The height of the top opening of the collection tank 5 can be flush with the liquid surface in the reaction chamber 2 or slightly higher than the liquid surface, so that the foam can enter the collection tank 5.

[0039] The electrocatalytic oxidation device provided in this embodiment blows the foam on the liquid surface into the collection tank 5 through an air blowing device, thereby achieving the effect of removing foam in the air, reducing the complexity of the top equipment, avoiding the corrosion of the electrode plate 28 and the connection by the foam, and increasing the service life of the electrode plate 28.

[0040] Considering the low density and poor fluidity of foam, it is difficult to perform subsequent processing after being blown into the collection tank 5. To solve this problem, in this embodiment of the invention, a filter screen 31 is provided at the inlet of the collection tank 5. The filter screen 31 is used to liquefy the foam entering the collection tank 5. When the foam enters the collection tank 5, it impacts the filter screen 31, which causes the foam to break and enter the collection tank 5. The liquefied fluid has good fluidity and can be discharged to other units for processing through the outlet on one side of the collection tank 5, such as the pretreatment device 1. Therefore, this embodiment of the invention also includes a pretreatment device 1, which is used to pretreat the wastewater before discharging it into the reaction chamber 2. The collection tank 5 and the inlet of the pretreatment device 1 are connected. Specifically, the liquefied fluid is returned to the pretreatment device 1 through the foam liquefaction return pipe 12.

[0041] The pretreatment equipment 1 can realize the "grid + coagulation + flocculation + sedimentation" pretreatment process, which pre-treats larger impurities and suspended solids in the wastewater, and prevents suspended solids from entering the reaction chamber 2 and adhering to the electrode plate 28, thus affecting the lifespan of the electrode plate 28 and the catalytic oxidation efficiency.

[0042] In this embodiment of the invention, a water distributor 9 is fixedly installed at the water inlet end of the reaction chamber 2.

[0043] In this embodiment of the invention, the electrocatalytic oxidation device further includes a gas recovery device, which includes a gas collection hood 23 and a tail gas separation device 24. The gas collection hood 23 is disposed above the reaction chamber 2, and the gas collection hood 23 and the tail gas separation device 24 are connected. The tail gas separation device 24 is used to separate and store the collected gas separately. The tail gas separation device 24 has a hydrogen outlet 25, a chlorine outlet 26, and a waste gas outlet 27.

[0044] In this embodiment, the gas collection hood 23 can be arranged above the reaction chamber 2 in a detached manner, and the area of ​​the hood must cover the entire reaction chamber 2. In order to achieve the purpose of collecting gas, a corresponding gas storage tank can be set up.

[0045] This embodiment can collect the gas after electrocatalysis, separate hydrogen, chlorine and exhaust gas, recover and reuse hydrogen and chlorine, and treat exhaust gas and harmful gases in an exhaust gas adsorption device.

[0046] In this embodiment of the invention, the electrode assembly includes an anode plate 36 and a cathode plate 35 arranged in a cross configuration, with a spacer 10 disposed in the gap between adjacent anode plates 36 and cathode plates 35.

[0047] In this embodiment, the spacer 10 ensures that the distance between the anode plate and the cathode plate remains constant, preventing the distance between the plates 28 from changing due to the impact of water flow, which would affect the electrocatalytic process.

[0048] Specifically, the spacer 10 can be fixedly mounted on a baffle 11, and the anode plate and cathode plate are snapped between adjacent spacers 10.

[0049] In some embodiments, the electrical connection wires between the anode plate and the cathode plate are fixed to the top horizontal plate 33.

[0050] In this embodiment of the invention, in order to reduce the generation of exhaust gas, a magnetic stirring device 7 is also provided. The stirring head of the magnetic stirring device 7 is located at the bottom of the reaction chamber 2, and the driving device of the magnetic stirring device 7 is located outside the reaction chamber 2 and below the reaction chamber 2.

[0051] This embodiment abandons the existing aeration and stirring methods and the motor-driven stirring head method, and adopts a magnetic stirring device 7 which will not produce exhaust gas.

[0052] When using a motor-driven method, if the motor is placed inside the cavity, not only does the motor need to be sealed, but the wiring is also difficult to lay. If the motor is placed outside the cavity, a hole needs to be made in the cavity to facilitate torque transmission. However, the magnetic stirring device 7 provided in this embodiment uses magnetic drive, which can be performed through the physical structure. It can achieve the purpose of driving the internal stirring head without setting a motor or making a hole at the bottom of the reaction chamber 2.

[0053] Although the above embodiments can increase the flowability of sewage in the reaction chamber 2, thereby preventing the sedimentation of solid particles in the sewage and reducing the accumulation of charge near the electrode plate 28, in order to further improve the flowability of sewage in the reaction chamber 2, in this embodiment of the invention, the electrode plates 28 of the electrode group are arranged sequentially along the length direction of the reaction chamber 2, and two return channels are formed between the electrode group and the side of the reaction chamber 2 in the width direction. The area between the two return channels forms a main channel. The two ends of the main channel are connected to the two ends of the return channel. A submersible mixer 6 is provided at the water inlet end of the return channel. The submersible mixer 6 is used to drive the water at the water inlet end of the return channel toward the water outlet end. The water outlet end of the return channel is connected to the water inlet end of the main channel.

[0054] This embodiment creates an internal circulation of wastewater, thereby improving the flowability of the wastewater.

[0055] Among them, the submersible mixer 6, also known as a submersible propeller, is suitable for propulsing and mixing sewage containing suspended solids, thin slurry, industrial process liquids, etc. in the process flow of sewage treatment plants, creating water flow, enhancing the mixing function, and preventing sludge sedimentation. It is an important piece of equipment in the process flow of municipal and industrial sewage treatment.

[0056] In this embodiment of the invention, an ultrasonic oscillator 8 is provided at the bottom of the reaction chamber 2.

[0057] Preferably, the ultrasonic oscillator 8 is located at the bottom center of the reaction chamber 2. The rod-type ultrasonic oscillator is used to treat the dirt on the surface of the electrode plate 28, extend the service life of the electrode plate 28 and ensure the catalytic oxidation effect. During use, the ultrasonic oscillator 8 can be turned on automatically at regular intervals or manually.

[0058] Due to weather and process reasons, the water temperature fluctuates greatly, which has a negative effect on the catalytic efficiency. In order to solve this problem, this embodiment of the invention also includes a cooling system 4. The wastewater treated by the pretreatment equipment 1 is first discharged into the cooling system 4 for cooling before being discharged into the reaction chamber 2.

[0059] Cooling system 4 uses a heat exchanger for cooling.

[0060] In some embodiments, a regulating tank 14, a sedimentation tank, and an effluent storage tank 16 are provided on one side of the reaction chamber 2. An effluent outlet is provided at or near the end of the reaction chamber 2, and the effluent outlet is connected to the regulating tank 14. An automatic pH dosing device 32 is provided above the regulating tank 14. The regulating tank 14, the sedimentation tank, and the effluent storage tank 16 are connected in sequence. An effluent outlet 39 is provided on one side of the effluent storage tank 16, and the effluent outlet 39 is connected to the inlet of the next unit.

[0061] In some embodiments, the effluent storage tank 16 can also be connected to the inlet of the pretreatment device 1.

[0062] This embodiment forms an external wastewater circulation system.

[0063] Specifically, the sedimentation tank includes sedimentation tank 13 and sedimentation tank 2 15. The equalization tank 14, sedimentation tank 13, sedimentation tank 2 15 and effluent storage tank 16 are connected in sequence. Overflow weirs are provided at the connection points of equalization tank 14 and sedimentation tank 13, sedimentation tank 13 and sedimentation tank 2 15, and sedimentation tank 2 15 and effluent storage tank 16 to maintain the liquid layer on the plate and make the liquid overflow evenly. Maintaining a certain liquid level difference helps to maintain the overall liquid level stability in each tank. The even overflow of sewage helps to increase the sedimentation effect of the sedimentation tank and better achieve sludge-water separation.

[0064] In a preferred embodiment, inclined plates 19 with large spacing are provided in the sedimentation tank 2 15 to enhance the sedimentation effect.

[0065] In a preferred embodiment, a sedimentation tank side overflow hole 38 is provided on one side of the overflow weir 20 of the sedimentation tank 2 15.

[0066] Specific examples have been used to illustrate the principles and implementation methods of this invention. The descriptions of the above embodiments are only for the purpose of helping to understand the method and core ideas of this invention. Furthermore, those skilled in the art will recognize that, based on the ideas of this invention, there will be changes in the specific implementation methods and application scope. Therefore, the content of this specification should not be construed as a limitation of this invention.

Claims

1. An electro-catalytic oxidation device comprising a reaction chamber and an electrode set, the electrode set being disposed within the reaction chamber, characterized in that: Also include: The foam removal mechanism includes a blowing device for blowing the liquid foam into the collection tank; a filter screen is provided at the inlet of the collection tank for liquefying the foam entering the collection tank; the electrode plates of the electrode group are arranged in sequence along the length direction of the reaction chamber, and the electrode group and the side of the reaction chamber in the width direction have a spacing to form two reflux channels, the area between the two reflux channels forms a main flow channel, the two ends of the main flow channel are communicated with the two ends of the reflux channel, the water inlet end of the reflux channel is provided with a submersible mixer for driving the water at the water inlet end of the reflux channel towards the water outlet end, and the water outlet end of the reflux channel is communicated with the water inlet end of the main flow channel; two collection tanks are arranged on both sides of the reaction chamber in the width direction, and the length direction of the reaction chamber is the flow direction of the reaction liquid; the execution mechanism of the blowing device is an aeration pipe, which is provided with a blowing hole for blowing the foam into the collection tank; it also includes a gas recovery device, which includes a gas collecting hood and a tail gas separation device, the gas collecting hood is arranged above the reaction chamber, the gas collecting hood is communicated with the tail gas separation device, and the tail gas separation device is used for separating and separately storing the collected gas.

2. The electro-catalytic oxidation device of claim 1, wherein: It also includes a pretreatment device for pretreating wastewater before discharging it into the reaction chamber, and the water inlet end of the collection tank is communicated with the pretreatment device.

3. The electro-catalytic oxidation device of claim 1, wherein: The electrode group includes anode plates and cathode plates arranged in cross, and a partition is arranged in the gap between adjacent anode plates and cathode plates.

4. The electro-catalytic oxidation device of claim 1, wherein: It also includes a magnetic stirring device, the stirring head of the magnetic stirring device is located at the bottom of the reaction chamber, and the driving device of the magnetic stirring device is located outside the reaction chamber and below the reaction chamber.

5. The electro-catalytic oxidation device of claim 2, wherein: The bottom of the reaction chamber is provided with an ultrasonic oscillator. It also includes a cooling system, the wastewater treated by the pretreatment device is discharged into the cooling system for cooling and then discharged into the reaction chamber.

6. The electro-catalytic oxidation device of claim 2, wherein: One side of the reaction chamber is provided with an adjustment tank, a sedimentation tank and a water outlet temporary storage tank, an outlet hole is arranged at the end or near the end of the reaction chamber, the outlet hole is communicated with the adjustment tank, and a PH automatic dosing device is arranged above the adjustment tank; the adjustment tank, the sedimentation tank and the water outlet temporary storage tank are communicated in sequence, and the water outlet temporary storage tank is communicated with the water inlet end of the next unit.

7. The electro-catalytic oxidation device of claim 6, wherein: The water inlet end of the pretreatment device can also be communicated with the water outlet temporary storage tank.

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