An apparatus for combined remediation of surface sewage

Abstract

The present application discloses a combined surface sewage remediation device. The combined remediation device includes: a pulsed power supply, an electrolysis treatment unit, and an ultrasonic unit; the electrolysis treatment unit has an electrode assembly connected to the pulsed power supply, and the electrode assembly includes an electrolysis cathode and an electrolysis anode; the ultrasonic unit includes an ultrasonic generator and a transducer, and the ultrasonic generator is electrically connected to the transducer; the electrolysis anode and the electrolysis cathode are respectively coupled to the transducer and serve as the ultrasonic vibrators of the ultrasonic generator, so that cavitation effects continuously occur on the surfaces of the electrolysis anode and the electrolysis cathode. The present application adopts the principles of electrolytic electrodes and ultrasonic purification to electrolyze organic pollutants in the polluted water body, and at the same time, the electrodes and the transducer are coupled to serve as the ultrasonic vibrators of the ultrasonic generator to remove the fouling on the electrode surfaces, improve the electrolysis efficiency, timely, efficiently and conveniently solve the problems of regional pollution and point source pollution in the surface water of rivers and lakes, prevent secondary pollution of nutrients in the water body, and ensure the long-term stable safety of the surface water of rivers and lakes.

Description

Technical Field

[0001] This application relates to the technical field of water pollution treatment, and particularly to a repair device for jointly repairing polluted surface water. Background Art

[0002] At present, conventional surface water repair technologies for rivers, lakes, etc. include conventional means such as physics, chemistry, and biology. For example: 1) Physical water diversion and replacement technology has huge construction workload, high technical implementation cost, and the original water in rivers and lakes diffuses under the action of water diversion and flushing, easily polluting adjacent and downstream surface water with low pollution level or unpolluted water. At the same time, during the process of water diversion and replacement, sediment resuspension may occur due to scouring, resulting in the release of nutrients and causing the risk of secondary pollution of nutrients in the water body; 2) The addition of chemical algaecides and coagulants can achieve significant treatment effects quickly in the short term, but its treatment only transfers the pollution rather than completely removing it. Therefore, it may cause secondary pollution and trigger new ecological problems. At the same time, the high treatment cost is difficult to be popularized in engineering; 3) The biological ecological repair technology with the help of artificial / natural ecological floating islands can reduce pollutants and nutrients in the water through means such as microbial biochemical degradation, absorption, transfer, root filtration, and adsorption of aquatic plants, effectively avoiding the potential risk of secondary pollution. However, it is easily affected by the surrounding environment, and the construction and operation and maintenance conditions are relatively harsh. At the same time, due to its long treatment cycle and slow effect, it is only used in small areas. It can be seen that the treatment and repair of surface water pollution in rivers, lakes, etc. is a complex systematic project, and there is an urgent need to develop fast and convenient treatment processes and equipment suitable for the current situation of water pollution. Summary of the Invention

[0003] The purpose of this application is to solve the problems in the prior art, such as high technical implementation cost, the water body is easily faced with the risk of secondary pollution of nutrients, the construction and operation and maintenance conditions are relatively harsh, and the treatment process has a long cycle and slow effect.

[0004] To achieve the above purpose, this application adopts the following technical solution: A combined repair device for surface sewage, the combined repair device includes:

[0005] A pulse power supply;

[0006] At least one electrolysis treatment unit, having an electrode assembly connected to the pulse power supply, the electrode assembly including an electrolysis cathode and an electrolysis anode;

[0007] An ultrasonic unit, including an ultrasonic generator and at least a pair of transducers electrically connected to the ultrasonic generator; wherein, at least a pair of the transducers are respectively coupled to the electrolysis anode and the electrolysis cathode to form an ultrasonic oscillator of the ultrasonic generator, so that cavitation effects continuously occur on the surfaces of the electrolysis anode and the electrolysis cathode.

[0008] Preferably, the material of the electrolytic anode is selected from a graphite carbon-based rhodium / iridium coated electrode or a metal titanium-based rhodium / iridium coated electrode.

[0009] Preferably, the electrolytic cathode is a metal iron electrode or a metal copper electrode.

[0010] Preferably, the electrode assembly includes a plurality of the electrolytic anodes and electrolytic cathodes, and the plurality of electrolytic anodes and electrolytic cathodes are alternately arranged to form a uniform electric field.

[0011] Preferably, a plurality of the electrolytic anodes and electrolytic cathodes are arranged in a concentric circular or semi-circular pattern, and the electrode assembly further includes a central anode located at the center of the circle or semi-circle.

[0012] Preferably, the electrolytic anodes and electrolytic cathodes both have a mesh structure, and the central anode has a solid semi-cylindrical structure.

[0013] Preferably, the scanning frequency of the ultrasonic generator is 20 - 100 kHz.

[0014] Preferably, a plurality of the electrolytic anodes are respectively connected to the anode of the pulsed power supply through a plurality of wires, and a plurality of the electrolytic cathodes are respectively connected to the cathode of the pulsed power supply through a plurality of wires.

[0015] Preferably, the repair device further includes an aeration unit, including an air compressor and a plurality of aeration heads connected to the air compressor.

[0016] Preferably, the electrolysis treatment unit further includes a filter cover wrapped outside the electrode assembly, and the filter cover has a metal mesh and a sponge, and the metal mesh forms a Faraday cage for the inner electrode assembly.

[0017] Preferably, for a surface sewage purification method, the surface water combined repair device is placed in the sewage to be purified, and the conditions are met: the distance from the lower end of the electrode assembly to the bottom of the water is 30 - 50 cm, and the upper end of the filter cover is 3 - 5 cm above the sewage water surface.

[0018] The present application has the following beneficial effects compared with the prior art:

[0019] This application adopts the principle of electrolytic electrodes and ultrasonic purification to electrolyze organic pollutants in the polluted water body. At the same time, since the electrolytic anode and cathode are coupled with the transducer as the ultrasonic vibrator of the ultrasonic generator, cavitation effect can be formed on the electrode surface to timely remove the fouling on the electrode surface, thereby improving the electrolysis efficiency, further enhancing the oxidation effect of the water body, solving the problem of concentration polarization caused by electrolysis of the electrode assembly, increasing the dissolved oxygen concentration of the water body while reducing the concentration of pollutants in the water, timely, efficiently and conveniently solving the problems of regional pollution and point source pollution in the surface water of rivers and lakes, preventing secondary pollution of nutrients in the water body, achieving rapid improvement of the surface water quality of rivers and lakes, and further ensuring the long-term stable safety of the surface water of rivers and lakes. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 is a schematic structural diagram of this application (excluding the pulse power supply);

[0021] Figure 2 is a principle flow chart of this application;

[0022] Figure 3 is a front view of the electrolysis treatment unit of this application;

[0023] Figure 4 is Figure 3 a top view of;

[0024] Figure 5 is a schematic structural diagram of the parallel connection mode of the electrodes of the electrode assembly of this application;

[0025] Figure 6 is a schematic position diagram of the parallel installation mode selected for the electrolysis treatment unit of this application in the water body with regional pollution;

[0026] Figure 7 is a schematic position diagram of the single-point installation mode selected for the electrolysis treatment unit of this application in the water body with point source pollution. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0027] To describe in detail the technical content, structural features, achieved objectives and effects of the application, the technical solutions in the embodiments of this application will be described below with reference to the accompanying drawings in the embodiments of this application. Obviously, the described embodiments are only a part of the embodiments of this application, rather than all of the embodiments. In the following description, for the purpose of explanation, many specific details are set forth to provide a detailed description of various exemplary embodiments or implementations of the invention. However, various exemplary embodiments can also be implemented without these specific details or in the case of one or more equivalent arrangements. In addition, various exemplary embodiments can be different, but not necessarily exclusive. For example, without departing from the inventive concept, the specific shapes, structures and characteristics of the exemplary embodiments can be used or implemented in another exemplary embodiment.

[0028] In the description of the present application, unless otherwise specified, the meaning of "a plurality of" is two or more.

[0029] In addition, in the present application, spatial relative terms such as "lower", "upper", etc. are used to describe the relationship between one element and another (other) element as shown in the drawings. The spatial relative terms are intended to include different orientations of the device in use, operation and / or manufacture in addition to the orientation depicted in the drawings.

[0030] In the present application, unless otherwise clearly defined and limited, the term "connected" should be understood in a broad sense. For example, "connected" can be a fixed connection, a detachable connection, or an integral one; it can be directly connected or indirectly connected through an intermediate medium.

[0031] The present application provides a combined surface sewage remediation device, as Figures 1 - 7 shown. The combined remediation device includes a pulse power supply 1 for power supply, an electrolytic treatment unit 2 for electrolytically oxidizing pollutants, and an ultrasonic unit 3. The combined remediation device is applicable to remediate sewage flows that cause the decline of surface water quality in rivers, lakes, etc. due to section / point source pollution.

[0032] The pulse power supply 1 can be a high-voltage DC pulse power supply.

[0033] As Figures 2 - 4 shown, the electrolytic treatment unit 2 includes an electrode assembly 21 connected to the pulse power supply 1. The electrode assembly 21 at least includes an electrolytic anode 213 and an electrolytic cathode 212. The electrolytic anode 213 is connected to the anode of the pulse power supply 1 through a wire, and the electrolytic cathode 212 is connected to the cathode of the pulse power supply 1.

[0034] In one embodiment, the electrode assembly 21 may include one or more pairs of electrolytic anodes 213 and electrolytic cathodes 212. According to the number and arrangement of the electrolytic anodes 213 and electrolytic cathodes 212, the electrode assembly 21 can form electric fields with different shapes and intensities.

[0035] Among them, the electrolytic anode 213 can be made of materials such as graphite carbon-based rhodium / iridium coated electrodes or metal titanium-based rhodium / iridium coated electrodes. In one embodiment, the electrolytic anode 213 is made into a mesh structure, specifically a mesh graphite carbon-based rhodium / iridium coated electrode. The mesh density of the mesh is 5 to 32 meshes, and the wire diameter of the wire forming the mesh is about 0.5 to 1.0 mm. The reason for such a setting is that during the ultrasonic electrolysis combined purification, the electrolytic anode 213 acts as an ultrasonic vibrator. When the electrode diameter is greater than 1.5 mm, the anode material is prone to peeling. When the wire diameter meets 0.5 to 1.0 mm, the electrolytic anode 213 can work stably, and under the action of the ultrasonic unit 3, cavitation effects can continuously occur on the surface of the electrolytic anode 213 to remove the fouling attached to the surface of the electrolytic anode 213 during the electrolysis process, thereby improving the anodic oxidation effect and increasing the electrolysis efficiency.

[0036] The electrolytic cathode 212 can be made of metal electrodes, such as inexpensive materials like iron and copper. In one embodiment, the electrolytic cathode 212 is also made into a mesh structure. The mesh density is 2 to 16 meshes, and the aperture is 1 to 8 mm. The electrolytic cathode 212 can work stably, and under the action of the ultrasonic unit 3, cavitation effects can continuously occur on the surface of the electrolytic cathode 212 to remove the fouling attached to the surface of the electrolytic cathode 212 during the electrolysis process, thereby improving the cathodic oxidation effect and increasing the electrolysis efficiency.

[0037] There can be various arrangement methods for the electrolytic cathode 212 and the electrode anode 213, as long as a uniform and stable electric field can be formed, such as a parallel electric field, a rectangular electric field, etc. In this embodiment, the electrolysis treatment unit 2 is circular or semi-circular, and the electrode assembly 21 further includes a chemically stable central anode 211. The central anode 211 is made of electrode materials such as graphite carbon-based rhodium / iridium coated electrodes or metal titanium-based rhodium / iridium coatings. In one embodiment, the central anode is a solid semi-cylindrical graphite carbon-based rhodium / iridium coated electrode. The central anode 211 is located at the center of the circle or semi-circle. A plurality of electrolytic cathodes 212 and electrolytic anodes 213 are arranged concentrically around the central anode 211 in a circular or semi-circular shape and are alternately arranged in sequence from the inside to the outside to form a stable electric field.

[0038] When the central anode 211 is connected to the pulse power supply 1, the central anode 211 is the initiating electrode for the electrolytic anode 213, and it stably and non-selectively oxidizes pollutants, achieving the functions of stable electrode voltage and pulse frequency. When the electrolytic cathode 212 is connected to the pulse power supply 1, hydrogen peroxide is formed under the combined action of electrons, oxygen, and water on the electrolytic cathode 212 and then decomposed into strong oxidation free radicals, thereby catalyzing and oxidizing the organic pollutants in the polluted water flow. When the electrolytic anode 213 is connected to the pulse power supply 1, a stable anode is formed, and the electrolytic anode 213 non-selectively oxidizes the organic pollutants in the polluted water flow.

[0039] The electrolysis treatment unit 2 further includes a filter cover 22 wrapped around the outer side of the electrode assembly 21. The filter cover 22 has a metal mesh 221 and a sponge 222. The sponge 222 is wrapped around the outer side of the electrode assembly 21. On the one hand, it can isolate and absorb the noise generated by the equipment to reduce the noise damage to aquatic animals. On the other hand, the sponge 222 can also filter particulate matter in the water body; the metal mesh 221 is wrapped around the outer side of the electrode assembly 21 along the circumferential direction, forming a Faraday cage for the inner electrode assembly 21, isolating the electric field formed by the electrode assembly 21 inside the metal mesh, and reducing the electromagnetic radiation pollution in the water. The filter cover 22 can also isolate the sundries suspended or floating around the electrode assembly 21, thereby preventing the floating sundries from causing a short circuit between the electrodes.

[0040] As Figure 1 , 2 shown, the ultrasonic unit 3 includes an ultrasonic generator 31 and a pair of transducers electrically connected to the ultrasonic generator 31. The ultrasonic generator 31 selects a device with a scanning frequency of 20 - 100 kHz. Preferably, the scanning frequency of the ultrasonic generator 31 is 50 - 90 kHz, and the power is 800 - 1500 kW. A pair of transducers are respectively coupled to the electrolysis cathode 212 and the electrolysis anode 213 to form an ultrasonic oscillator of the ultrasonic generator 31. The transducers convert electrical energy into vibration energy to drive the electrolysis cathode 212 and the electrolysis anode 213 to vibrate, so that cavitation effects continuously occur on the surfaces of the electrolysis cathode 212 and the electrolysis anode 213. The vibration of the electrolysis cathode 212 and the electrolysis anode 213 forms a cavitation zone with high temperature, high pressure, high-speed shear force and strongly oxidizing free radicals around the treatment electrode assembly 21; the algae in the sewage flow wither and die under the high temperature, high pressure, high-speed shear force and strongly oxidizing free radicals in the cavitation zone, achieving the purpose of reducing the number of algae. At the same time, the organic pollutants in the sewage flow are removed without selectivity, achieving the purpose of reducing the concentration of organic pollutants in the sewage flow.

[0041] The combined remediation device further includes a group of aeration units 4. The aeration unit 4 includes an air compressor 42 and several aeration heads 41 connected to the air compressor 42; several aeration heads 41 are immersed in the sewage flow, and at least one aeration head 41 is close to the electrode assembly 21; the air compressor 42 oxygenates the aeration heads 41 to stir the sewage flow and supply oxygen to the periphery of the electrode assembly 21, solving the problem of concentration polarization generated by electrolysis of the electrode assembly 21, improving the electrolysis efficiency of the electrode, and increasing the contact interface area between the strongly oxidizing groups formed by catalysis and oxidation and the pollutants, effectively reducing the concentration of pollutants in the water, and then improving the water quality of surface waters such as rivers and lakes, slowing down or controlling (even solving) the outbreak of water blooms, and then increasing the added value of the water body.

[0042] A surface sewage combined remediation device of the present application also has a surface sewage purification method. Place the combined remediation device of the above embodiment in the sewage to be purified, and the distance from the lower end of the electrode assembly 21 to the bottom of the water is 30 - 50 cm, and the upper end of the filter cover 22 is 3 - 5 cm above the sewage water surface; the part of the filter cover 22 above the water surface is used to block the floating debris on the water surface from flowing into the electrode assembly 21.

[0043] As Figure 5 shown, the electrolytic cathode 212 and the electrolytic anode 213 of the electrode assembly 21 are connected in parallel. The parallel connection method is: multiple electrolytic anodes 213 are respectively connected to the anode of the pulse power supply 1 through multiple wires, and multiple electrolytic cathodes 212 are respectively connected to the cathode of the pulse power supply 1 through multiple wires.

[0044] As Figure 6 shown, when the electrolytic treatment unit 2 encounters regional pollution, multiple circular electrolytic treatment units 2 are respectively installed downstream of the sewage flow, and the electrode assemblies 21 of the electrolytic treatment units 2 are connected to the pulse power supply 1 through a parallel connection method. When the sewage flow flows downstream, it passes through the electrolytic treatment unit 2, and the electrolytic treatment unit 2 performs regional water body remediation on the sewage flow.

[0045] As Figure 7 shown, when the electrolytic treatment unit 2 encounters point source pollution, multiple semi-circular electrolytic treatment units 2 are sequentially installed at multiple pollution leakage points 5 along the river or lake shore, and the electrode assemblies 21 of the multiple electrolytic treatment units 2 are single-pointed and then connected to the pulse power supply 1. The sewage flow flowing out from the pollution leakage point 5 passes through the electrolytic treatment unit 2, and the electrolytic treatment unit 2 performs point-to-point water body remediation on the pollution leakage point 5.

[0046] As shown in Table 1, compared with the current conventional remediation process plan, the electrolytic treatment unit 2 and the ultrasonic unit 3 are operated jointly in the technical solution of the present application, which can greatly improve the energy efficiency of treating polluted rivers / lakes. At the same time, compared with the ecological floating island, on the premise of slightly increasing the operation and maintenance cost, it saves the device generation cost and the manual assembly cost. By changing the voltage time and potential of the pulse power supply 1 according to the actual water quality, and at the same time adjusting the circulation period and frequency range of the ultrasonic unit 3, it can effectively improve the device's ability to reduce organic pollutants in water and remove the number of algae in the raw water. After being treated by the technology of the present application, the effluent reaches the water quality requirements of Class IV - V in the "Surface Water Environment Quality Standard of the People's Republic of China" (GB3838 - 2002). The treatment ranges of water body pH, permanganate index, COD, BOD, ammonia nitrogen, TP, and SS are significantly expanded, effectively solving the problem of the decline in the water quality of surface waters such as rivers and lakes caused by section / point source pollution, and at the same time, the DO index is significantly improved.

[0047] Table 1

[0048]

[0049] This application adopts the principle of electrolytic electrodes and ultrasonic purification to electrolyze organic pollutants in the polluted water body. At the same time, since the electrolytic anode 213 and the electrolytic cathode 212 are coupled with the transducer as the ultrasonic vibrator of the ultrasonic generator 31, cavitation effect can be formed on the electrode surface to timely remove the fouling on the electrode surface, thereby improving the electrolysis efficiency, further enhancing the oxidation effect of the water body, solving the problem of concentration polarization caused by electrolysis of the electrode assembly 21, increasing the dissolved oxygen concentration of the water body while reducing the concentration of pollutants in the water, timely, efficiently and conveniently solving the problems of surface water pollution and point source pollution in rivers, lakes and surface water areas, preventing secondary pollution of nutrients in the water body, realizing the rapid improvement of the water quality of rivers, lakes and surface water, and further ensuring the long-term stable safety of rivers, lakes and surface water.

[0050] The above shows and describes the basic principle, main features and advantages of this application. Those skilled in the art should understand that this application is not limited by the above embodiments. What is described in the above embodiments and the specification only illustrates the principle of this application. Without departing from the spirit and scope of this application, this application will have various changes and improvements. The scope of protection required by this application is defined by the appended claims, the specification and their equivalents.

Claims

1. A combined surface sewage remediation device, characterized in that, The described combined repair device includes: A pulsed power supply (1); At least one electrolysis treatment unit (2), having an electrode assembly (21) connected to the pulsed power supply (1), the electrode assembly (21) including an electrolysis cathode (212) and an electrolysis anode (213); An ultrasonic unit (3), including an ultrasonic generator (31) and at least a pair of transducers electrically coupled to the ultrasonic generator (31); wherein, at least a pair of the transducers are respectively coupled to the electrolysis anode (213) and the electrolysis cathode (212) to form an ultrasonic oscillator of the ultrasonic generator (31), such that cavitation effects continuously occur on the surfaces of the electrolysis anode (213) and the electrolysis cathode (212); The electrode assembly (21) includes a plurality of the electrolysis anodes (213) and electrolysis cathodes (212), the plurality of the electrolysis anodes (213) and electrolysis cathodes (212) are alternately arranged respectively to form a uniform electric field; the plurality of the electrolysis anodes (213) and electrolysis cathodes (212) are arranged in a concentric circular or semi-circular shape, and the electrode assembly (21) further includes a central anode (211), the central anode (211) is located at the center of the circle or semi-circle; the electrolysis treatment unit (2) further includes a filter cover (22) wrapped outside the electrode assembly (21), the filter cover (22) has a metal mesh (221) and a sponge (222), and the metal mesh (221) forms a Faraday cage for the inner electrode assembly (21).

2. The combined surface sewage remediation device according to claim 1, characterized in that The material of the electrolysis anode (213) is selected as a graphite carbon-based rhodium / iridium coated electrode or a metal titanium-based rhodium / iridium coated electrode.

3. The combined surface sewage remediation device according to claim 1, characterized in that, The electrolysis cathode (212) is a metal iron electrode or a metal copper electrode.

4. The combined surface sewage remediation device according to claim 1, characterized in that, Both the electrolysis anode (213) and the electrolysis cathode (212) have a mesh structure, and the central anode (211) has a solid semi-cylindrical structure.

5. The combined surface sewage remediation device according to claim 1, characterized in that, The scanning frequency of the ultrasonic generator (31) is 20~100 kHz.

6. The combined surface sewage remediation device according to claim 1, wherein, The plurality of electrolysis anodes (213) are respectively connected to the anode of the pulsed power supply (1) through a plurality of wires, and the plurality of electrolysis cathodes (212) are respectively connected to the cathode of the pulsed power supply (1) through a plurality of wires.

7. The combined surface sewage remediation device according to claim 1, wherein, The repair device further includes an aeration unit (4), including an air compressor (42) and a plurality of aeration heads (41) connected to the air compressor (42).

8. A method for purifying surface sewage, characterized in that, Place the surface sewage combined repair device described in claim 1 in the sewage to be purified, and meet the conditions: the distance from the lower end of the electrode assembly (21) to the bottom of the water is 30~50 cm, and the upper end of the filter cover (22) is 3~5 cm higher than the sewage water surface.

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