Sewage purification device

Abstract

The invention belongs to the technical field of air galleries of air blowers, and particularly relates to a sewage purification device. According to the technical scheme, the sewage purification device comprises a sewage treatment box body, a sewage collecting pool is arranged on the lower portion of the sewage treatment box body, and a sewage treatment tank body is installed on the upper side of the sewage collecting pool; the sewage treatment tank body comprises an ultrasonic flocculation unit, a multi-layer centrifugal separation unit, an electric field auxiliary separation unit, a nano material filtering unit and an effluent collection unit which are sequentially arranged from top to bottom, and a water pumping pipe is connected between the bottom of the sewage collection tank and the ultrasonic flocculation unit. The sewage purification device provided by the invention can be used for fully purifying sewage generated by cleaning an air purification unit of an air gallery of an air blower, so that the influence on water, soil and surrounding ecological environment caused by direct discharge is avoided.

Description

Technical Field

[0001] The invention belongs to the technical field of blower air gallery, and in particular relates to a sewage purification device. Background Art

[0002] Excessive dust content in the blower intake air will have adverse effects on the air pump blades, mainly including:

[0003] 1) Accelerated wear: A large amount of dust will intensify the friction and wear on the blade surface and shorten the service life of the blade.

[0004] 2) Reduced efficiency: Dust accumulation on the blade surface will change the aerodynamic characteristics of the blade and reduce the working efficiency of the air pump.

[0005] 3) Balance destruction: Uneven dust deposition on the blades may cause the rotor to lose balance and cause vibration.

[0006] 4) Corrosion: Certain dust components may be corrosive and accelerate the degradation of blade materials.

[0007] 5) Blockage of air duct: In severe cases, it may cause blockage of air passage and affect air circulation.

[0008] To solve the above problems, an air filter needs to be installed to filter the air intake of the blower. In addition, in order to prevent the air filter from accumulating too much dust and affecting the filtering effect, the air filter needs to be cleaned regularly. At present, the treatment of contaminated mud generated by the cleaning of air filters is an important issue in the field of environmental protection. Untreated discharge will directly affect the water, soil and surrounding ecological environment. Summary of the invention

[0009] In order to solve the above problems existing in the prior art, the purpose of the present invention is to provide a sewage purification device, which can fully purify the sewage generated by cleaning the air purification unit of the air corridor of the air blower, so as to avoid direct discharge affecting the water body, soil and surrounding ecological environment.

[0010] The technical solution adopted by the present invention is:

[0011] A sewage purification device comprises a sewage treatment box body, a sewage collection pool is arranged at the lower part of the sewage treatment box body, a sewage treatment tank body is installed on the upper side of the sewage collection pool, the sewage treatment tank body comprises an ultrasonic flocculation unit, a multi-layer centrifugal separation unit, an electric field assisted separation unit, a nano material filtering unit and a water outlet collection unit which are arranged in sequence from top to bottom, and a pumping pipe is connected between the bottom of the sewage collection pool and the ultrasonic flocculation unit.

[0012] After the sewage is collected by the sewage collection tank of the present invention, the sewage is sent to the ultrasonic flocculation unit, which uses the microbubbles generated by the ultrasonic cavitation effect to promote the collision and coagulation of small particles in the sewage to form larger flocs, which are convenient for subsequent separation. The multi-layer centrifugal separation unit centrifuges the sludge in the sewage and sends the separated sludge out. The sewage is then fully treated by the electric field assisted separation unit and the nano material filtration unit and then sent to the effluent collection unit. The ultrasonic flocculation unit, the multi-layer centrifugal separation unit, the electric field assisted separation unit, and the nano material filtration unit of the present invention can fully treat the sewage and prevent the discharged water from affecting the water body, soil and the surrounding ecological environment.

[0013] As a preferred embodiment of the present invention, a plurality of sewage water pits are arranged at the bottom of the sewage water collection tank, a pumping device is installed in the sewage water pit, a pumping pipe is connected to the pumping device, and a large-aperture filter is arranged on the upper part of the sewage water pit. Sewage flows from the sewage water collection tank into each sewage water pit, so that the pumping device in the sewage water pit can pump the sewage to the ultrasonic flocculation unit. The large-aperture filter can block large impurities and prevent them from entering the sewage treatment tank.

[0014] As a preferred embodiment of the present invention, a stirring device and an ultrasonic generator are installed in the ultrasonic flocculation unit, a water outlet weir is arranged on the top of the ultrasonic flocculation unit, a water outlet pipe is connected to the bottom of the water outlet weir, and the lower end of the water outlet pipe is connected to the multi-layer centrifugal separation unit. Under the full stirring action of the stirring device, the ultrasonic generator uses the microbubbles generated by the ultrasonic cavitation effect to promote the collision and coagulation of small particles in the sewage, forming a larger floc, which is convenient for subsequent separation. The water treated with ultrasound flows into the multi-layer centrifugal separation unit through the water outlet weir and the water outlet pipe, preventing the lower layer of sewage from entering the multi-layer centrifugal separation unit.

[0015] As a preferred embodiment of the present invention, a plurality of large-pore ceramic foam filter chambers are arranged in the multi-layer centrifugal separation unit, a pressurized filtration device is arranged in the large-pore ceramic foam filter chamber, the top of the pressurized filtration device is connected to the ultrasonic flocculation unit through a water outlet pipe, a flocculent recovery spiral is installed in the pressurized filtration device, a drainage weir is arranged on the top of the multi-layer centrifugal separation unit, and a drainage pipe is connected between the drainage weir and the electric field assisted separation unit.

[0016] The outlet pipe between the multi-layer centrifugal separation unit and the ultrasonic flocculation unit is equipped with a pressurizing device, that is, the inlet water is under a certain pressure. The flocculant recovery device is always rotating, which has the effect of collecting flocculants and rotating and squeezing them. The pressure filter device is sealed inside and connected to the sludge discharge pipe, which is emptied when the sludge is discharged. The pressure filter device itself is a large-aperture hard support material, and the inner wall is a ceramic membrane material of 1 to 10μm to achieve mechanical filtration. The large-aperture ceramic foam filter chamber further removes particulate pollutants by adsorption. The treated sewage is sent to the electric field assisted separation unit through the drainage weir and the drainage pipe.

[0017] As a preferred solution of the present invention, a sludge collecting device is provided at the bottom of the sewage collecting pool, and the sludge collecting device is connected to a sludge discharge pipe, and the sludge discharge pipe is respectively connected to the bottom of a plurality of pressure filtering devices. The pressure filtering device is sealed inside, connected to the sludge discharge pipe, and emptied when discharging sludge. The sludge is sent to the sludge collecting device through the sludge discharge pipe.

[0018] As a preferred embodiment of the present invention, the electric field assisted separation unit comprises a plurality of electrode separation plates which are arranged in sequence from the outside to the inside and whose heights are successively reduced. A drainage pipe is connected to the outermost electrode separation plate, and the other end of the drainage pipe is connected to the multi-layer centrifugal separation unit. A water outlet is arranged in the innermost electrode separation plate, and the water outlet is connected to the nano material filtration unit. Sewage flows from the outer electrode separation plate into the inner electrode separation plate in sequence to remove charged particles, colloids, etc.

[0019] As a preferred solution of the present invention, an annular water distribution pipe is arranged inside the outermost electrode separation plate, and the annular water distribution pipe is connected to the water inlet pipe. The annular water distribution pipe can evenly deliver sewage into the outermost electrode separation plate from all directions.

[0020] As a preferred embodiment of the present invention, the nano material filter unit includes several layers of nano material filter membranes arranged sequentially from the outside to the inside, the inner cavity of the innermost nano material filter membrane is connected to the electric field assisted separation unit through the water outlet, the outermost nano material filter membrane is connected to a water collecting pipe, and the other end of the water collecting pipe is connected to the water outlet collection unit. The sewage flows from the innermost nano material filter membrane to the outermost nano material filter membrane in sequence, thereby fully filtering the sewage.

[0021] As a preferred solution of the present invention, an ultraviolet lamp is arranged on the inner wall of the nano material filter membrane. The ultraviolet light realizes surface enhanced advanced oxidation reaction to further remove the difficult-to-degrade organic substances in the sewage.

[0022] As a preferred solution of the present invention, an annular nano-micro bubble pipeline is arranged in the nano material filter membrane. The nano-micro bubble pipeline passes nano-micro bubbles to the space between the nano material filter membranes, and cooperates with ultraviolet light to effectively remove the difficult-to-degrade organic substances.

[0023] The beneficial effects of the present invention are:

[0024] After the sewage is collected by the sewage collection tank of the present invention, the sewage is sent to the ultrasonic flocculation unit, which uses the microbubbles generated by the ultrasonic cavitation effect to promote the collision and coagulation of small particles in the sewage to form larger flocs, which are convenient for subsequent separation. The multi-layer centrifugal separation unit centrifuges the sludge in the sewage and sends the separated sludge out. The sewage is then fully treated by the electric field assisted separation unit and the nano material filtration unit and then sent to the effluent collection unit. The ultrasonic flocculation unit, the multi-layer centrifugal separation unit, the electric field assisted separation unit, and the nano material filtration unit of the present invention can fully treat the sewage and prevent the discharged water from affecting the water body, soil and the surrounding ecological environment. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 It is a cutaway structural diagram of the first position of the present invention;

[0026] Figure 2 is a cross-sectional structural diagram of the second position of the present invention;

[0027] Figure 3 It is a structural schematic diagram of a sewage treatment tank;

[0028] Figure 4 It is a partial structural diagram of the present invention;

[0029] Figure 5 It is a schematic diagram of the structure of the ultrasonic flocculation unit;

[0030] Figure 6 is a schematic diagram of the structure of a multi-layer centrifugal separation unit;

[0031] Figure 7 It is a partial structural diagram of the electric field assisted separation unit;

[0032] Figure 8 It is a structural schematic diagram of a nano material filtration unit.

[0033] In the figure: 1-sewage treatment box; 2-sewage collection tank; 3-sewage treatment tank; 4-ultrasonic flocculation unit; 5-multi-layer centrifugal separation unit; 6-electric field assisted separation unit; 7-nano material filtration unit; 8-effluent collection unit; 21-pumping pipe; 22-sewage sump; 23-pumping device; 24-large-aperture filter; 25-sludge collection device; 26-sludge discharge pipe; 41-stirring device; 42-ultrasonic generator; 43-effluent weir; 44-effluent pipe; 51-large-aperture ceramic foam filter chamber; 52-pressure filtration device; 53-floc recovery spiral; 54-drainage weir; 55-drainage pipe; 61-electrode separation plate; 62-water outlet; 63-annular water distribution pipe; 71-nano material filter membrane; 72-water collection pipe; 73-ultraviolet lamp; 74-nano micro bubble pipeline. DETAILED DESCRIPTION

[0034] In order to make the purpose, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Generally, the components of the embodiments of the present invention described and shown in the drawings here can be arranged and designed in various different configurations.

[0035] Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the claimed invention, but merely represents selected embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in the field without creative work are within the scope of protection of the present invention. It should be noted that the embodiments of the present invention and the features in the embodiments can be combined with each other without conflict.

[0036] like Figure 1 to Figure 3 As shown, a sewage purification device of this embodiment includes a sewage treatment box body 1, a sewage collecting pool 2 is arranged at the lower part of the sewage treatment box body 1, a sewage treatment tank body 3 is installed on the upper side of the sewage collecting pool 2, and the sewage treatment tank body 3 includes an ultrasonic flocculation unit 4, a multi-layer centrifugal separation unit 5, an electric field assisted separation unit 6, a nanomaterial filtration unit 7 and a water collection unit 8 arranged in sequence from top to bottom, and a pumping pipe 21 is connected between the bottom of the sewage collecting pool 2 and the ultrasonic flocculation unit 4.

[0037] After the sewage collection tank 2 of the present invention collects the sewage, the sewage is sent to the ultrasonic flocculation unit 4, which uses the microbubbles generated by the ultrasonic cavitation effect to promote the collision and coagulation of small particles in the sewage to form larger flocs for subsequent separation. The multi-layer centrifugal separation unit 5 centrifuges the sludge in the sewage and sends the separated sludge out. The sewage is then fully treated by the electric field assisted separation unit 6 and the nano material filtration unit 7 and then sent to the effluent collection unit 8. The ultrasonic flocculation unit 4, the multi-layer centrifugal separation unit 5, the electric field assisted separation unit 6, and the nano material filtration unit 7 of the present invention can fully treat the sewage to prevent the discharged water from affecting the water body, soil and the surrounding ecological environment.

[0038] Furthermore, a plurality of sewage water pits 22 are provided at the bottom of the sewage water collection tank 2, a pumping device 23 is installed in the sewage water pit 22, a pumping pipe 21 is connected to the pumping device 23, and a large-aperture filter 24 is provided on the upper part of the sewage water pit 22. Sewage flows from the sewage water collection tank 2 into each sewage water pit 22, so that the pumping device 23 in the sewage water pit 22 can pump the sewage to the ultrasonic flocculation unit 4. The large-aperture filter 24 can block large impurities and prevent them from entering the sewage treatment tank 3.

[0039] Specifically, Figure 4 and Figure 5 As shown, the ultrasonic flocculation unit 4 is equipped with a stirring device 41 and an ultrasonic generator 42, and a water outlet weir 43 is arranged on the top of the ultrasonic flocculation unit 4. The bottom of the water outlet weir 43 is connected to a water outlet pipe 44, and the lower end of the water outlet pipe 44 is connected to the multi-layer centrifugal separation unit 5. Under the full stirring action of the stirring device 41, the ultrasonic generator 42 uses the microbubbles generated by the ultrasonic cavitation effect to promote the collision and coagulation of small particles in the sewage, forming a larger floc, which is convenient for subsequent separation. The water treated with ultrasound flows into the multi-layer centrifugal separation unit 5 through the water outlet weir 43 and the water outlet pipe 44, preventing the lower layer of sewage from entering the multi-layer centrifugal separation unit 5.

[0040] Key parameters of ultrasonic generator 42: frequency range: 20-40kHz; power density: 0.1-0.5W / cm 3 ; Processing time: 30-120s. Performance data: Increase in average particle size of flocs: 200%-300%; Turbidity reduction: 60%-80%; Energy consumption: 0.05-0.1kWh / m 3 .

[0041] Multi-band combination: Use ultrasonic waves of different frequencies at the same time to improve flocculation efficiency. Pulse mode: Use intermittent ultrasonic treatment to reduce energy consumption. Adaptive control: Adjust ultrasonic parameters in real time according to the influent water quality.

[0042] Specifically, Figure 6 As shown, the multi-layer centrifugal separation unit 5 is provided with a plurality of large-pore ceramic foam filter chambers 51, and a pressurized filter device 52 is provided in the large-pore ceramic foam filter chamber 51. The top of the pressurized filter device 52 is connected to the ultrasonic flocculation unit 4 through a water outlet pipe 44, and a flocculent recovery spiral 53 is installed in the pressurized filter device 52. A drainage weir 54 is provided on the top of the multi-layer centrifugal separation unit 5, and a drainage pipe 55 is connected between the drainage weir 54 and the electric field assisted separation unit 6.

[0043] The outlet pipe 44 between the multi-layer centrifugal separation unit 5 and the ultrasonic flocculation unit 4 is provided with a pressurizing device, that is, the incoming water carries a certain pressure. The flocculant recovery device is always rotating, which has the effect of collecting flocculants and rotating and squeezing them. The pressure filter device 52 is sealed inside and connected to the sludge discharge pipe, which is emptied when the sludge is discharged. The pressure filter device 52 itself is a large-pore hard support material, and the inner wall is a ceramic membrane material of 1 to 10 μm to achieve mechanical filtration. The large-pore ceramic foam filter chamber 51 further removes particulate pollutants by adsorption. The treated sewage is sent to the electric field assisted separation unit 6 through the drainage weir 54 and the drainage pipe 55.

[0044] Furthermore, a sludge collecting device 25 is provided at the bottom of the sewage collection tank, and the sludge collecting device 25 is connected to a sludge discharge pipe 26, and the sludge discharge pipe 26 is respectively connected to the bottom of a plurality of pressure filtering devices 52. The pressure filtering device 52 is sealed inside and connected to a sludge discharge pipe, and is emptied when the sludge is discharged. The sludge is sent to the sludge collecting device 25 through the sludge discharge pipe 26, and the sludge discharge pipe 26 is controlled by an electric valve.

[0045] Specifically, if Figure 7 As shown, the electric field assisted separation unit 6 includes a plurality of electrode separation plates 61 arranged in sequence from the outside to the inside with decreasing heights. A drain pipe 55 is connected to the outermost electrode separation plate 61, and the other end of the drain pipe 55 is connected to the multi-layer centrifugal separation unit 5. A water outlet 62 is arranged in the innermost electrode separation plate 61, and the water outlet 62 is connected to the nano material filtration unit 7. Sewage flows from the outer electrode separation plate 61 to the inner electrode separation plate 61 in sequence to remove charged particles, colloids, etc. An annular water distribution pipe 63 is arranged in the outermost electrode separation plate 61, and the annular water distribution pipe 63 is connected to the water inlet pipe. The annular water distribution pipe 63 can evenly deliver sewage into the outermost electrode separation plate 61 from all directions.

[0046] Technical parameters: Electric field strength: 0.5-2kV / cm; Electrode material: titanium-based DSA (dimensionally stable anode) electrode; Electrode spacing: 5-10cm; Power supply type: high-frequency pulsed DC power supply.

[0047] Performance data: Charged particle removal rate: >95%; Colloid removal rate: 80%~90%; Energy consumption: 0.1~0.3kWh / m 3 water.

[0048] Features: Adaptive electric field strength regulation: Automatically adjust the electric field strength according to the conductivity of the influent water; Multi-pole electrode design: Increase the electric field coverage area and improve the separation efficiency; Electrochemical oxidation synergy: Synergistically degrade some organic matter during the separation process.

[0049] Specifically, if Figure 8 As shown, the nano material filter unit 7 includes several layers of nano material filter membranes 71 arranged sequentially from the outside to the inside, the inner cavity of the innermost nano material filter membrane 71 is connected to the electric field assisted separation unit 6 through the water outlet 62, and the outermost nano material filter membrane 71 is connected to a water collecting pipe 72, and the other end of the water collecting pipe 72 is connected to the water outlet collection unit 8. The sewage flows from the innermost nano material filter membrane 71 to the outermost nano material filter membrane 71 in sequence, so that the sewage is fully filtered.

[0050] Material composition:

[0051] Base material: PVDF (polyvinylidene fluoride) membrane; functionalized nanomaterials: graphene oxide (GO) and carbon nanotubes (CNTs). Nanomaterial loading: 0.1-0.5wt%.

[0052] Composite structure design:

[0053] 1) Use a multi-layer composite structure: PVDF as the functional layer, with a support layer with high mechanical strength. The support layer material can be selected from: polysulfone (PSf), polyethersulfone (PES) or polyamide (PA).

[0054] Structural parameters: PVDF functional layer thickness: 0.1-0.5 μm; support layer thickness: 50-150 μm; total thickness: 50-200 μm.

[0055] 2) Nanofiber reinforcement: Add high-strength nanofibers to the PVDF matrix; Material selection: carbon nanotubes (CNTs), polyamide nanofibers; Addition ratio: 0.5-2wt%. The tensile strength is increased by 30%-50%, and the Young's modulus is increased by 20%-40%.

[0056] 3) Cross-linking treatment: Cross-linking agent: diisocyanate, polyol; cross-linking degree: 10% to 30%; the mechanical strength of the film is increased by 40% to 60%, and the solvent resistance is enhanced.

[0057] Load mode:

[0058] 1) In-situ polymerization method: directly add nanomaterials during the polymerization of PVDF monomers, with a loading amount of 1 to 5 wt%.

[0059] 2) Co-spinning method: The nanomaterial is mixed with PVDF solution and then spun, with a loading amount of 0.1 to 1 wt%.

[0060] 3) Surface modification method: plasma activation of PVDF surface, application of nanomaterials by dipping or spraying, fixation of nanomaterials by UV light or heat treatment, loading density: 0.1-0.5 mg / cm 2 .

[0061] Structural parameters: tensile strength: >5Mpa; elongation at break: >50%; porosity: 60%~80%; compressive strength: >0.5Mpa.

[0062] Filtration performance: molecular weight cut-off: 100-1000Da; flux: 50-100L / (m 2 h)@0.1Mpa; Anti-pollution: 90% flux recovery rate (after chemical cleaning)

[0063] Service life: Continuous operation time: >1000 hours; Chemical cleaning cycle: every 200-300 hours.

[0064] An ultraviolet lamp 73 is provided on the inner wall of the nano material filter membrane 71. The ultraviolet light realizes the surface enhanced advanced oxidation reaction, further removing the difficult-to-degrade organic substances in the sewage. An annular nano-micro bubble pipeline 74 is provided in the nano material filter membrane 71. The nano-micro bubble pipeline 74 passes nano-micro bubbles to the space between the nano material filter membranes 71, and cooperates with the ultraviolet light to effectively remove the difficult-to-degrade organic substances.

[0065] The present invention is not limited to the above-mentioned optional implementation modes. Anyone can derive other various forms of products under the inspiration of the present invention. However, no matter what changes are made in the shape or structure, all technical solutions that fall within the scope defined by the claims of the present invention fall within the protection scope of the present invention.

Claims

1. A sewage purification device, characterized in that: The invention comprises a sewage treatment box (1), a sewage collection tank (2) being arranged at the bottom of the sewage treatment box (1), a sewage treatment tank (3) being installed on the upper side of the sewage collection tank (2), the sewage treatment tank (3) comprising an ultrasonic flocculation unit (4), a multi-layer centrifugal separation unit (5), an electric field assisted separation unit (6), a nano material filtering unit (7) and an effluent collection unit (8) being arranged in sequence from top to bottom, and a water extraction pipe (21) being connected between the bottom of the sewage collection tank (2) and the ultrasonic flocculation unit (4).

2. A sewage purification device according to claim 1, characterized in that: A plurality of sewage water pits (22) are arranged at the bottom of the sewage water collection tank (2), a pumping device (23) is installed in the sewage water pits (22), a pumping pipe (21) is connected to the pumping device (23), and a large-aperture filter screen (24) is arranged on the top of the sewage water pits (22).

3. A sewage purification device according to claim 1, characterized in that: The ultrasonic flocculation unit (4) is provided with a stirring device (41) and an ultrasonic generator (42). A water outlet weir (43) is arranged at the top of the ultrasonic flocculation unit (4). The bottom of the water outlet weir (43) is connected to a water outlet pipe (44). The lower end of the water outlet pipe (44) is connected to the multi-layer centrifugal separation unit (5).

4. A sewage purification device according to claim 1, characterized in that: The multi-layer centrifugal separation unit (5) is provided with a plurality of large-pore ceramic foam filter chambers (51), a pressure filter device (52) is provided in the large-pore ceramic foam filter chamber (51), the top of the pressure filter device (52) is connected to the ultrasonic flocculation unit (4) via a water outlet pipe (44), a flocculent recovery spiral (53) is installed in the pressure filter device (52), a drainage weir (54) is provided at the top of the multi-layer centrifugal separation unit (5), and a drainage pipe (55) is connected between the drainage weir (54) and the electric field assisted separation unit (6).

5. A sewage purification device according to claim 4, characterized in that: A sludge collecting device (25) is provided at the bottom of the sewage collecting tank, and the sludge collecting device (25) is connected to a sludge discharge pipe (26), and the sludge discharge pipe (26) is respectively connected to the bottom of a plurality of pressure filtering devices (52).

6. A sewage purification device according to claim 1, characterized in that: The electric field assisted separation unit (6) comprises a plurality of electrode separation plates (61) which are arranged in sequence from the outside to the inside and whose heights decrease in sequence. A drainage pipe (55) is connected to the outermost electrode separation plate (61), and the other end of the drainage pipe (55) is connected to the multi-layer centrifugal separation unit (5). A water outlet (62) is arranged in the innermost electrode separation plate (61), and the water outlet (62) is connected to the nano material filtering unit (7).

7. A sewage purification device according to claim 6, characterized in that: An annular water distribution pipe (63) is arranged inside the outermost electrode separation plate (61), and the annular water distribution pipe (63) is connected to the water inlet pipe.

8. A sewage purification device according to claim 1, characterized in that: The nano material filter unit (7) comprises a plurality of nano material filter membranes (71) arranged in sequence from the outside to the inside, the inner cavity of the innermost nano material filter membrane (71) is connected to the electric field assisted separation unit (6) via a water outlet (62), the outermost nano material filter membrane (71) is connected to a water collecting pipe (72), and the other end of the water collecting pipe (72) is connected to a water outlet collection unit (8).

9. A sewage purification device according to claim 8, characterized in that: An ultraviolet lamp tube (73) is arranged on the inner wall of the nano material filter membrane (71).

10. A sewage purification device according to claim 8, characterized in that: An annular nano-micro bubble pipeline (74) is arranged inside the nano material filter membrane (71).

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