Sewage treatment plant

Abstract

This invention discloses a wastewater treatment device, comprising a first housing, a wastewater treatment component, pipes, and valves. The first housing has a first cavity and is provided with an inlet, an outlet, and a return outlet. The wastewater treatment component includes a second housing with a second cavity containing packing material. The second housing is disposed within the first cavity and is provided with an outlet and an inlet. The pipes include a first pipe connected to the inlet and a second pipe connected to the return outlet, and the first and second pipes are interconnected. The valves include a first valve and a second valve. The first valve is located at the connection between the first and second pipes, and the second valve is located on the first pipe between the first valve and the inlet. This invention solves the problem of packing material in the wastewater treatment component easily clogging the water passages on the component, thereby improving wastewater treatment efficiency and extending the service life of the component.

Description

Technical Field

[0001] This invention relates to the technical field of wastewater treatment, and more specifically, to a wastewater treatment device. Background Technology

[0002] In related technologies, anaerobic fluidized bed reactors are widely used in wastewater treatment. An anaerobic fluidized bed reactor mainly consists of a distributor, a sludge layer, and wastewater treatment components. These components are filled with packing material, which is used to purify the wastewater within the anaerobic fluidized bed reactor. However, after prolonged use, the packing material inside the wastewater treatment components can easily clog the water passages, reducing wastewater treatment efficiency and even damaging the components themselves. Summary of the Invention

[0003] The present invention aims to at least partially solve one of the technical problems in the related art.

[0004] Therefore, embodiments of the present invention propose a sewage treatment device that solves the problem that the packing material inside the sewage treatment component easily clogs the water passage holes on the sewage treatment component after long-term use, thereby improving sewage treatment efficiency and extending the service life of the sewage treatment component.

[0005] A wastewater treatment device according to an embodiment of the present invention includes: a first housing having a first cavity, an inlet at the bottom of the first housing, and an outlet and a return outlet at the top of the first housing; a wastewater treatment assembly including a second housing having a second cavity, packing material in the second cavity, the second housing being disposed within and connected to the first cavity, an outlet at the top of the second housing communicating with both the first and second cavities, and an inlet at the bottom of the second housing communicating with both the first and second cavities; a pipeline including a first pipeline and a second pipeline, the first pipeline being connected to the inlet, the second pipeline being connected to the return outlet, and the first and second pipelines communicating with each other; and a valve including a first valve and a second valve, the first valve being disposed at the connection between the first and second pipelines to open and close the second pipeline, and the second valve being disposed on the first pipeline and located between the first valve and the inlet.

[0006] According to an embodiment of the present invention, a wastewater treatment device is provided outside a first housing with a first pipe and a second pipe. The first pipe is connected to an inlet on the first housing, and the second pipe is connected to an outlet on the first housing. The first pipe and the second pipe are interconnected. A first valve is provided at the connection between the first pipe and the second pipe, and a second valve is provided on the first pipe between the first valve and the inlet. The wastewater treatment device can control the flow direction of water in the first pipe through the first valve and the second valve. Water can be introduced into the first housing from the outlet. The water introduced into the first housing can backwash the outlet and inlet of the wastewater treatment component to solve the problem of blockage of the outlet and inlet of the wastewater treatment component, thereby improving the wastewater treatment efficiency and even extending the service life of the wastewater treatment component.

[0007] In some embodiments, the wastewater treatment device further includes a power source, and the wastewater treatment assembly further includes an anode assembly and a cathode assembly, both of which are disposed within the first cavity, with the anode assembly located below the cathode assembly, and both the anode assembly and the cathode assembly being electrically connected to the power source.

[0008] In some embodiments, the anode assembly includes an anode housing and an anode element. The anode housing is cylindrical and connected to the first housing. The anode element is connected to the anode housing and electrically connected to the power source.

[0009] In some embodiments, the outer periphery of the cross-section of the anode element is annular.

[0010] In some embodiments, there are multiple anodes, which are radially spaced and coaxially arranged.

[0011] In some embodiments, the outer periphery of the cross-section of the anode element is generally rectangular.

[0012] In some embodiments, there are multiple anode elements, which are arranged at circumferential intervals along the anode housing.

[0013] In some embodiments, the cathode assembly includes a cathode element disposed within the second cavity, and the cathode element is connected to the second housing.

[0014] In some embodiments, the wastewater treatment assembly further includes a microbial biofilm located within the second cavity and attached to the packing material.

[0015] In some embodiments, the wastewater treatment apparatus further includes a three-phase separator disposed within the first cavity and located above the wastewater treatment assembly.

[0016] In some embodiments, the wastewater treatment apparatus further includes a sludge layer disposed within the first cavity and located below the wastewater treatment component.

[0017] In some embodiments, the wastewater treatment apparatus further includes a water distributor disposed in the first cavity, located below the sludge layer and connected to the inlet. Attached Figure Description

[0018] Figure 1 This is a schematic diagram of a wastewater treatment device according to an embodiment of the present invention.

[0019] Figure 2 yes Figure 1 A front view of the wastewater treatment components in a wastewater treatment device.

[0020] Figure 3 yes Figure 1 A schematic diagram of the anode assembly in a wastewater treatment device.

[0021] Figure 4 yes Figure 1 Another schematic diagram of the anode assembly in a wastewater treatment device.

[0022] Figure label:

[0023] First housing 1, first part 101, second part 102, first cavity 11, inlet 12, return outlet 13, outlet 14, sewage treatment component 2, second housing 21, outlet hole 211, inlet hole 212, second cavity 22, anode component 23, anode housing 231, anode element 232, cathode component 24, cathode element 241, pipe 3, first pipe 31, second pipe 32, valve 4, first valve 41, second valve 42, packing 5, three-phase separator 6. Detailed Implementation

[0024] Embodiments of the present invention are described in detail below, examples of which are illustrated in the accompanying drawings. The embodiments described below with reference to the accompanying drawings are exemplary and intended to explain the present invention, and should not be construed as limiting the present invention.

[0025] like Figure 1 As shown in Figure X, the wastewater treatment device according to an embodiment of the present invention includes a first housing 1, a wastewater treatment component 2, a pipe 3, and a valve 4.

[0026] The first housing 1 has a first cavity 11, an inlet 12 at the bottom, and an outlet 14 and a return outlet 13 at the top. Figure 1 As shown, the first housing 1 is arranged vertically, and the length direction of the first housing 1 is... Figure 1As shown in the vertical direction, the first housing 1 includes a first part 101 and a second part 102. The first part 101 is generally cylindrical, with a circular inner circumferential profile in its cross-section. An outlet 14 and an inlet 13 are provided on the side wall of the first part 101 adjacent to its top wall. The second part 102 is generally conical, with a circular inner circumferential profile in its cross-section and a V-shaped inner circumferential profile in its longitudinal section along its axial direction. An inlet 12 is located at the peak of the second part 102. Therefore, when sewage flows into the first cavity 11 from the inlet 12, the sewage can flow to the top of the first housing 1 more quickly, which is beneficial for improving sewage treatment efficiency.

[0027] The wastewater treatment component 2 includes a second housing 21, which has a second cavity 22, and packing material 5 is disposed in the second cavity 22. The second housing 21 is disposed in the first cavity 11 and connected to the first housing 1. The top of the second housing 21 is provided with an outlet hole 211, which communicates with the first cavity 11 and the second cavity 22. The bottom of the second housing 21 is provided with an inlet hole 212, which communicates with the first cavity 11 and the second cavity 22.

[0028] like Figures 1-2 As shown, the second housing 21 includes a top plate and a bottom plate arranged opposite to each other. The top plate is provided with a plurality of water outlet holes 211, which penetrate the upper top plate in the vertical direction. The bottom plate is provided with a plurality of water inlet holes 212, which penetrate the lower bottom plate in the vertical direction. The sewage in the first cavity 11 flows from bottom to top through the water inlet holes 212 and the water outlet holes 211 in sequence.

[0029] The second chamber 22 is equipped with packing material 5, which includes, but is not limited to, sand packing material, polyvinyl chloride packing material, and biologically active packing material. The packing material 5 has an adsorption function, capable of adsorbing organic matter and heavy metal elements in wastewater. Preferably, both the inlet hole 212 and the outlet hole 211 are circular holes. The particle size of the packing material 5 is larger than the diameter of the inlet hole 212 and the outlet hole 211, preventing the packing material 5 from flowing out of the second chamber 22 through either the inlet hole 212 or the outlet hole 211.

[0030] Pipeline 3 includes a first pipe 31 and a second pipe 32. The first pipe 31 is connected to the inlet 12, and the second pipe 32 is connected to the outlet 13. The first pipe 31 and the second pipe 32 are connected.

[0031] like Figure 1As shown, both the first pipe 31 and the second pipe 32 are located outside the first housing 1. The sewage treatment device introduces sewage into the first housing 1 through the first pipe 31. The sewage treatment device can then introduce the purified sewage back into the first pipe 31 through the second pipe 32, allowing it to flow into the first housing 1 again. This allows for multiple purification processes of the sewage within the sewage treatment device, improving the degree of purification. Alternatively, the sewage treatment device can sequentially transport sewage to the top of the first housing 1 through the first pipe 31 and the second pipe 32. The sewage flows from top to bottom through the sewage treatment component 2 in the first cavity 12, clearing the outlet holes 211 and inlet holes 212 on the sewage treatment component 2 and resolving the problem of blockage in the outlet holes 211 and inlet holes 212.

[0032] Valve 4 includes a first valve 41 and a second valve 42. The first valve 41 is located at the connection between the first pipe 31 and the second pipe 32 to open and close the second pipe 32. The second valve 42 is located on the first pipe 31 and between the first valve 41 and the inlet 12.

[0033] like Figure 1 As shown, the first valve 41 can open and close the second pipe 32, and the second valve 42 can open and close the first pipe 31. When the second pipe 32 performs its backflow function, sewage flows from the return port 13 to the first pipe 31 and then flows into the first housing 1 together with the sewage already in the first pipe 31. At this time, the second valve 42 is open. When the second pipe 32 performs its backflushing function, the second valve 42 is closed, and the sewage flowing in the first pipe 31 flows directly to the return port 13 through the second pipe 32. After flowing into the first housing 1, the sewage flows from top to bottom through the sewage treatment component 2, thus cleaning the sewage treatment component 2.

[0034] According to an embodiment of the present invention, a wastewater treatment device is provided outside a first housing 1 with a first pipe 31 and a second pipe 32. The first pipe 31 is connected to the inlet 12 on the first housing 1, and the second pipe 32 is connected to the return outlet 13 on the first housing 1. The first pipe 31 and the second pipe 32 are connected. A first valve 41 is provided at the connection between the first pipe 31 and the second pipe 32, and a second valve 42 is provided on the first pipe 31 between the first valve 41 and the inlet 12. The wastewater treatment device can control the flow direction of the water in the first pipe 31 through the first valve 41 and the second valve 42. The water can be introduced into the first housing 1 from the return outlet 13. The water introduced into the first housing 1 can backwash the outlet 211 and the inlet 212 on the wastewater treatment component 2 to solve the problem of blockage of the outlet 211 and the inlet 212 on the wastewater treatment component 2, thereby improving the wastewater treatment efficiency and extending the service life of the wastewater treatment component 2.

[0035] In some embodiments, the wastewater treatment device further includes a power source (not shown), and the wastewater treatment component 2 further includes an anode component 23 and a cathode component 24. The anode component 23 and the cathode component 24 are both disposed in the first cavity 11. The anode component 23 is located below the cathode component 24, and both the anode component 23 and the cathode component 24 are electrically connected to the power source.

[0036] like Figure 1 As shown, both the anode assembly 23 and the cathode assembly 24 are disposed within the first cavity 11. Both are connected to the inner circumferential surface of the first housing 1, with the anode assembly 23 located below the cathode assembly 24. Thus, wastewater flows within the first cavity 11, first passing through the anode assembly 23 and then through the cathode assembly 24. A power source is located outside the first housing 1, and both the anode assembly 23 and the cathode assembly 24 are electrically connected to this power source. Therefore, when wastewater flows through the anode assembly 23, oxygen is generated on its surface, and organic matter in the wastewater undergoes an oxidation reaction on the surface of the anode assembly 23, thus degrading the organic matter. When wastewater flows through the cathode assembly 24, hydrogen gas is generated on its surface, and organic matter in the wastewater undergoes a reduction reaction on the surface of the cathode assembly 24, thus removing nitrate and nitrite nitrogen from the wastewater.

[0037] In some embodiments, the anode assembly 23 includes an anode housing 231 and an anode element 232. The anode housing 231 is cylindrical and connected to the first housing 1. The anode element 232 is connected to the anode housing 231 and is electrically connected to a power source.

[0038] like Figure 3 As shown, the outer periphery of the anode housing 231 is annular in cross-section. The anode housing 231 is disposed within the first cavity 12, and its outer periphery is connected to the inner periphery of the first housing 1. The anode element 232 is disposed inside the anode housing 231, and its inner surface is connected to the anode housing 231. Power is supplied to the anode element 232 so that when wastewater flows through it, an oxidation reaction occurs on the surface of the anode element 232.

[0039] In some embodiments, the outer periphery of the cross-section of the anode member 232 is annular.

[0040] like Figure 3 As shown, the anode element 232 is generally cylindrical and is located inside the anode housing 231. The anode element 232 and the anode housing 231 are coaxial. As a result, the anode element 232 has a larger specific surface area and a larger contact area with sewage, which is beneficial to improving the sewage treatment effect.

[0041] In some embodiments, there are multiple anode elements 232, and the multiple anode elements 232 are arranged radially (e.g., ...). Figure 1The left and right directions are shown, and they are arranged at intervals and coaxially.

[0042] As shown in the figure, the multiple anode components 232 are all cylindrical, and the diameter of the multiple anode components 232 decreases sequentially. Thus, the multiple anode components 232 can be nested together. There is a gap between adjacent anode components 232 in the left-right direction, and the multiple anode components 232 are arranged coaxially in the up-down direction.

[0043] In some embodiments, the outer periphery of the cross-section of the anode member 232 is generally rectangular.

[0044] like Figure 4 As shown, the anode element 232 is generally a rectangular plate, arranged vertically, and its length direction is... Figure 1 As shown in the up-down direction, when the sewage from the sewage treatment device flows from bottom to top through the anode 232, the obstruction of the anode 232 to the sewage is minimized.

[0045] In some embodiments, there are multiple anode elements 232, which are arranged at circumferential intervals along the anode housing 231.

[0046] As shown in the figure, the multiple anode components 232 are all rectangular plates, and the multiple anode components 232 are arranged at intervals along the circumference of the anode shell 231. The multiple anode components 232 are all connected to the inner circumferential surface of the anode shell 231. As a result, the anode components 232 have a larger specific surface area and a larger contact area with sewage, which is beneficial to improving the sewage treatment effect.

[0047] In some embodiments, the cathode assembly 24 includes a cathode element 241 disposed in the second cavity 22, and the cathode element 241 is connected to the second housing 21.

[0048] like Figures 1-2 As shown, the cathode component 241 is located in the second cavity 22 and connected to the second housing 21. The second cavity 22 is filled with packing 5. When sewage flows through the cathode assembly 24, the cathode component 241 and the packing 5 work together to achieve the purpose of sewage purification.

[0049] In some embodiments, the wastewater treatment assembly 2 further includes a microbial biofilm (not shown), which is located within the second cavity 22 and attached to the packing 5.

[0050] like Figures 1-2 As shown, the second chamber 22 is equipped with a cathode 241, a packing 5, and a microbial biofilm attached to the packing 5. The sewage continuously undergoes reduction and anaerobic decomposition reactions in the second chamber 22. In the anaerobic decomposition reaction, the organic matter in the sewage will produce methane, carbon dioxide, and other gases. Among them, methane is the main component of the gases produced by the organic matter in the sewage.

[0051] In some embodiments, the wastewater treatment apparatus further includes a three-phase separator 6 disposed within the first cavity 11 and located above the wastewater treatment assembly 2.

[0052] like Figure 1 As shown, the three-phase separator 6 is located in the first chamber 12, below the return water inlet 13 and the outlet 14, and above the sewage treatment component 2. The three-phase separator 6 can separate the sewage, impurities and gases (methane, carbon dioxide and other gases) in the first chamber 12 to improve the methane collection efficiency.

[0053] In some embodiments, the wastewater treatment apparatus further includes a sludge layer (not shown), which is disposed within the first cavity 11 and located below the wastewater treatment assembly 2.

[0054] like Figure 1 As shown, the sludge layer consists of granular, high-concentration sludge suspended in a sludge suspension. Both the density of the high-concentration sludge and the sludge suspension are greater than the density of the wastewater. Under gravity, the high-concentration sludge and sludge suspension settle at the bottom of the first chamber 12. The sludge layer and sludge suspension contain a large number of microorganisms. Wastewater in the first chamber 12 first flows through the sludge layer and sludge suspension, where it mixes thoroughly with the microorganisms and undergoes anaerobic decomposition. The methane produced during anaerobic decomposition lifts the sludge particles as it rises, causing the sludge layer to expand. Finally, propelled by the combined action of wastewater and methane gas, the high-concentration sludge contacts the bottom plate of the wastewater treatment component 2, thus clogging the inlet hole 212. Therefore, a second pipe 32 is provided outside the first shell 1, allowing the wastewater treatment device to directly supply wastewater to the top of the first shell 1. The wastewater then flushes the wastewater treatment component 2 from top to bottom within the first chamber 12.

[0055] In some embodiments, the wastewater treatment apparatus further includes a water distributor (not shown), which is disposed in the first cavity 11, located below the sludge layer and connected to the inlet 12.

[0056] like Figure 1 As shown, the water distributor is located in the first chamber 12 and is connected to the inlet 12. The water distributor diverts the sewage flowing in from the inlet 12 and transports the diverted sewage to the bottom of the sludge layer. Thus, the water distributor makes the sewage flow to the sludge layer faster and improves the efficiency of sewage treatment.

[0057] The following is a reference appendix. Figure 1-3 This invention describes some specific exemplary wastewater treatment apparatuses according to the present invention.

[0058] like Figure 1-3As shown, the wastewater treatment device according to an embodiment of the present invention includes: a first housing 1, a wastewater treatment component 2, a pipe 3, a valve 4, packing material 5, a three-phase separator 6, a sludge layer, a water distributor, and a power supply.

[0059] The first housing 1 is arranged vertically and has a first cavity 12 inside. The first housing 1 includes a first part 101 and a second part 102.

[0060] The first part 101 is generally cylindrical, and the inner circumference of the cross-section of the first part 101 is circular. The first part 101 has an outlet 14 and an outlet 13 on the side wall adjacent to its top wall.

[0061] The second part 102 is generally conical, with a circular inner perimeter of its cross-section and a V-shaped inner perimeter of its longitudinal section along its axial direction. An inlet 12 is located at the peak of the cone of the second part 102.

[0062] Pipeline 3 includes a first pipe 31 and a second pipe 32. The first pipe 31 is connected to the inlet 12, and the second pipe 32 is connected to the outlet 13. The first pipe 31 and the second pipe 32 are connected.

[0063] Valve 4 includes a first valve 41 and a second valve 42. The first valve 41 is located at the connection between the first pipe 31 and the second pipe 32 to open and close the second pipe 32. The second valve 42 is located on the first pipe 31 and between the first valve 41 and the inlet 12.

[0064] The water distributor is located in the first chamber 12 and is connected to the water inlet 1.

[0065] The sludge layer is located inside the first cavity 12, above the water distributor.

[0066] Wastewater treatment component 2 is disposed in the first cavity 12 and is located above the sludge layer. Wastewater treatment component 2 includes an anode component 23 and a cathode component 24, wherein the anode component 23 is located below the cathode component 24.

[0067] The anode assembly 23 includes an anode housing 231 and a plurality of anode elements 232.

[0068] The anode housing 231 is cylindrical, and the outer periphery of the cross-section of the anode housing 231 is annular. The outer periphery of the anode housing 231 is connected to the inner periphery of the first housing 1.

[0069] Multiple anode elements 232 are cylindrical, and the diameters of the multiple anode elements 232 decrease sequentially. The multiple anode elements 232 are nested together. There is a gap between adjacent anode elements 232 in the left-right direction. The multiple anode elements 232 are coaxially arranged in the up-down direction. The multiple anode elements 232 are all connected to the anode housing 231. The multiple anode elements 232 are all electrically connected to the power supply.

[0070] The cathode assembly 24 includes a second housing 21 and a cathode component 241. The second housing 21 has a second cavity 22. The cathode component 241 is disposed in the second cavity 22 and connected to the inner circumferential surface of the second housing 21. The filler 5 is disposed in the second cavity 22.

[0071] The second housing 21 includes an upper top plate and a lower bottom plate arranged opposite each other in the vertical direction. The upper top plate is provided with a plurality of water outlet holes 211, which penetrate the upper top plate in the vertical direction. The lower bottom plate is provided with a plurality of water inlet holes 212, which penetrate the lower bottom plate in the vertical direction. Both the water inlet holes 212 and the water outlet holes 211 are round holes.

[0072] The three-phase separator 6 is located inside the first chamber 12, above the wastewater treatment assembly 2, and below the return water inlet 13 and the outlet 14.

[0073] The following is a reference appendix. Figure 4 Other specific exemplary wastewater treatment apparatuses according to the present invention are described.

[0074] like Figure 4 As shown, the wastewater treatment device according to an embodiment of the present invention includes: a first housing 1, a wastewater treatment component 2, a pipe 3, a valve 4, packing material 5, a three-phase separator 6, a sludge layer, a water distributor, and a power supply.

[0075] Multiple anode elements 232 are rectangular plates, and the multiple anode elements 232 are arranged at intervals along the circumference of the anode shell 231. The multiple anode elements 232 are all connected to the inner circumferential surface of the anode shell 231.

[0076] Figure 4 Other structures of the wastewater treatment device shown can be combined with Figures 1-2 The embodiments shown are the same, and will not be described in detail here.

[0077] In the description of this invention, it should be understood that the terms "center," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," and "circumferential" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing this invention and simplifying the description, and are not intended to indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this invention.

[0078] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one of that feature. In the description of this invention, "a plurality of" means at least two, such as two, three, etc., unless otherwise explicitly specified.

[0079] In this invention, unless otherwise explicitly specified and limited, the terms "installation," "connection," "linking," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection, an electrical connection, or a connection that allows communication between them; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components, unless otherwise explicitly limited. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0080] In this invention, unless otherwise explicitly specified and limited, "above" or "below" the second feature can mean that the first feature is in direct contact with the second feature, or that the first feature is in indirect contact with the second feature through an intermediate medium. Furthermore, "above," "over," and "on top" of the second feature can mean that the first feature is directly above or diagonally above the second feature, or simply that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature can mean that the first feature is directly below or diagonally below the second feature, or simply that the first feature is at a lower horizontal level than the second feature.

[0081] In this invention, the terms "one embodiment," "some embodiments," "example," "specific example," or "some examples," etc., refer to a specific feature, structure, material, or characteristic described in connection with that embodiment or example, which is included in at least one embodiment or example of the invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples. Moreover, without contradiction, those skilled in the art can combine and integrate the different embodiments or examples described in this specification, as well as the features of different embodiments or examples.

[0082] Although embodiments of the present invention have been shown and described above, it is understood that the above embodiments are exemplary and should not be construed as limiting the present invention. Those skilled in the art can make changes, modifications, substitutions and variations to the above embodiments within the scope of the present invention.

Claims

1. A wastewater treatment device, characterized in that, include: A first housing, having a first cavity inside, with a water inlet at the bottom and a water outlet and a water return outlet at the top; A wastewater treatment assembly includes a second housing, a second cavity inside the second housing, a packing material inside the second cavity, the second housing being disposed inside and connected to the first housing, a water outlet at the top of the second housing communicating with the first and second cavities, and a water inlet at the bottom of the second housing communicating with the first and second cavities. The pipeline includes a first pipeline and a second pipeline, wherein the first pipeline is connected to the inlet, the second pipeline is connected to the outlet, and the first pipeline and the second pipeline are connected in series. The valve includes a first valve and a second valve. The first valve is located at the connection between the first pipe and the second pipe to open and close the second pipe. The second valve is located on the first pipe and between the first valve and the inlet to open and close the first pipe. When the second pipe functions as a backflow pipe, sewage flows from the return port to the first pipe and then flows into the first housing along with the original sewage in the first pipe. At this time, the second valve is opened. When the second pipe functions as a backflushing pipe, the second valve is closed, and the sewage flowing in the first pipe flows directly through the second pipe to the return port and into the first housing. The water flowing into the first housing can backflush the outlet and inlet of the sewage treatment component. It also includes a power supply. The wastewater treatment assembly further includes an anode assembly and a cathode assembly. The anode assembly and the cathode assembly are both disposed in the first cavity. The anode assembly is located below the cathode assembly. The anode assembly and the cathode assembly are both electrically connected to the power supply. It also includes a microbial biofilm, which is located in the second cavity and attached to the packing material; The anode assembly includes an anode housing and anode elements. The anode housing is cylindrical and connected to the first housing. The anode elements are connected to the anode housing and electrically connected to the power supply. There are multiple anode elements. The outer periphery of the cross-section of the anode element is annular, and the multiple anode elements are arranged coaxially and radially spaced. Alternatively, the outer periphery of the cross-section of the anode element is generally rectangular, and the multiple anode elements are arranged circumferentially spaced along the anode housing. The cathode assembly includes a cathode element disposed within the second cavity, and the cathode element is connected to the second housing.

2. The wastewater treatment device according to claim 1, characterized in that, It also includes a three-phase separator, which is disposed in the first cavity and located above the wastewater treatment assembly.

3. The wastewater treatment device according to claim 1, characterized in that, It also includes a sludge layer, which is disposed in the first cavity and located below the wastewater treatment component.

4. The wastewater treatment device according to claim 3, characterized in that, It also includes a water distributor, which is located in the first cavity, below the sludge layer and connected to the water inlet.

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