CN111777132B

CN111777132B - Reclaimed water recycling system for sewage of breeding, printing, dyeing, electroplating, chemical engineering and the like

Info

Publication number: CN111777132B
Application number: CN202010666167.7A
Authority: CN
Inventors: 孙嘉保禄; 孙嘉琦; 孙成
Original assignee: WENZHOU HAIDENENG ENVIRONMENTAL PROTECTION EQUIPMENT & TECHNOLOGY CO LTD
Current assignee: WENZHOU HAIDENENG ENVIRONMENTAL PROTECTION EQUIPMENT & TECHNOLOGY CO LTD
Priority date: 2020-07-13
Filing date: 2020-07-13
Publication date: 2022-06-17
Anticipated expiration: 2040-07-13
Also published as: CN111777132A

Abstract

The invention discloses a system for recycling sewage water in the fields of aquaculture, printing, dyeing, electroplating, chemical engineering and the like, which at least comprises a first filtering part and a second filtering part, wherein the first filtering part is arranged in the second filtering part to define a first space between the first filtering part and the second filtering part, the first filtering part at least comprises a first half shell, a second half shell and a corrugated pipe, the first half shell is hinged to the first end of the second filtering part, the second half shell is hinged to the second end of the second filtering part, one end of the corrugated pipe is connected to the first half shell, and the other end of the corrugated pipe is connected to the second half shell, so that the first half shell and/or the second half shell can rotate around the respective hinge points when being subjected to external force. Through the impact of intaking to first breakwater and second breakwater, can drive half first shell and the half shell of second and swing, and then make first filtration membrane and second filtration membrane form vibrations to can clear away its accumulational dirt.

Description

Reclaimed water recycling system for sewage of breeding, printing, dyeing, electroplating, chemical engineering and the like

Technical Field

The invention belongs to the field of sewage treatment, and particularly relates to a reclaimed water recycling system for sewage of breeding, printing and dyeing electroplating chemical industry and the like.

Background

The aggravation of water pollution and the increase of water consumption lead the limited water resources to be increasingly tense, and the regeneration and the reuse of sewage become an important way for solving the shortage of water resources. The conventional anaerobic and aerobic activated sludge or biofilm process is adopted to treat wastewater, and the recycling process is generally as follows: the process is complex, the occupied area is large, the sludge amount is large, the effluent stability is poor, and the operating cost is high. The conventional Membrane bioreactor (Membrane Bio-reactors, MBR for short) is adopted, the water treatment technology of a sedimentation tank and a sand filter tank in the conventional biochemical treatment technology is replaced by Membrane filtration, Membrane pores are easily blocked by colloidal substances and soluble microbial products, the effluent flux is unstable and is continuously reduced along with time, the Membrane system is easy to pollute and damage (mainly concentration polarization phenomenon and filter cake layer and macromolecular solute pollution), the recovery of the Membrane flux by adopting the conventional acid-base chemical cleaning process is more troublesome, the maintenance cost is high, the Membrane service life is short, the Membrane is frequently replaced after the Membrane is completely blocked and loses efficacy, the Membrane replacement cost is high, the system maintenance is troublesome, and the system is large in operation energy consumption and high in cost. Therefore, the prior art has a plurality of reclaimed water recycling systems based on the vibration film.

For example, as the prior art with publication number CN105417899A, it relates to an ultrasonic electro-adsorption electro-fenton, desalination and decoloration water treatment device and method, which is characterized by comprising a suspended sludge settling tank, a photocatalytic electro-adsorption electro-fenton reactor, an NF membrane group, etc.; the sewage adjusting tank is connected with the suspended sludge settling tank, the suspended sludge settling tank is connected with a first middle water tank, the first middle water tank is connected with the photocatalytic electro-adsorption electro-Fenton reactor, the photocatalytic electro-adsorption electro-Fenton reactor is connected with the vibration membrane bioreactor, and the vibration membrane bioreactor is connected with the NF membrane group. The treatment method comprises the steps of isolating impurities in the wastewater; secondly, carrying out sedimentation through a suspended sludge sedimentation tank; thirdly, photoresist removal and desalination are carried out through a photocatalytic electro-adsorption electro-Fenton reactor; fourthly, treating the wastewater by a vibration membrane bioreactor; fifthly, sterilization and disinfection are carried out through the NF membrane group. The invention has short retention time, eliminates ammonia odor and desalts; the device not only can operate stably continuously, but also has the advantages of low operation cost, low power consumption and the like.

Disclosure of Invention

The invention aims to provide a sewage recycling system for aquaculture, printing and dyeing, electroplating and chemical industry and the like, which is self-cleaning by a filtering membrane, energy-saving and high in water production efficiency.

The technical scheme adopted by the invention for realizing the purpose is as follows: the utility model provides a breed sewage reuse of water system such as printing and dyeing electroplating chemical industry, at least, include first filter house and second filter house, first filter house sets up in the second filter house in order to inject the first space between first filter house and the second filter house, first filter house includes first half shell at least, half shell of second and bellows, first half shell articulates the first end to the second filter house, half shell of second articulates the second end to the second filter house, the one end of bellows is connected to first half shell, the other end of bellows is connected to half shell of second, make first half shell and/or half shell of second all can be rotatory around its respective pin joint when receiving the exogenic action. Be provided with first filtration membrane in the first half shell, and be provided with second filtration membrane in the second half shell in order to separate the inner chamber of first filter portion for first cavity, second cavity and third cavity, be provided with first breakwater in the first cavity, be provided with the second breakwater in the second cavity, wherein, sewage gets into and can assault first breakwater after in the first cavity so that first half shell is rotatory along first direction around its pin joint, perhaps sewage gets into and can assault second breakwater after in the second cavity so that second half shell is rotatory along second direction opposite with first direction around its pin joint. The first filter part further comprises an elastic body, one end of the elastic body is connected to the first half shell, the other end of the elastic body is connected to the second half shell, inlet water can enter the first cavity and the second cavity simultaneously at periodically changing inlet water pressure, wherein the first half shell can rotate along the first direction and the second half shell can rotate along the second direction during the process that the inlet water pressure is gradually increased, or the first half shell can rotate along the second direction and the second half shell can rotate along the first direction during the process that the inlet water pressure is gradually decreased. Through the impact of intaking to first breakwater and second breakwater, can drive half first shell and the half shell of second and swing, and then make first filtration membrane and second filtration membrane form vibrations to can clear away its accumulational dirt. In addition, whole process only need change the pressure of intaking through the suction pump and just can realize, need not set up driving motor alone for the swing of half first shell and the half second shell, and then can reach the purpose that reduces the energy consumption.

The sewage reclaimed water recycling system for the aquaculture, printing and dyeing, electroplating and chemical industry and the like further comprises a box body, the second filtering part is arranged in the box body according to a rotation mode so as to limit a second space between the second filtering part and the box body, and a plurality of third filtering membranes are arranged on the second filtering part. Through the rotation of the second filtering portion, the purified water in the second space can be made to form a centrifugal force, and finally the speed of the purified water passing through the third filtering membrane is increased, namely, the filtering efficiency of the third filtering membrane can be enhanced at the moment.

The rotation speed of the second filter portion can exhibit a periodically varying pattern so that the purified water entering the second space can form a relative displacement with the third filter membrane based on its own inertia in the case where the rotation speed of the second filter portion is reduced from the first speed to the second speed. The first sliding block is connected to the first sliding groove in a sliding mode along the extending direction of the first sliding groove, and the second sliding block is connected to the second sliding groove in a sliding mode along the extending direction of the second sliding groove. The rotating speed of the second filtering portion can be changed periodically, and then when the rotating speed of the second filtering portion is reduced, the purified water in the second space keeps the original speed based on inertia, so that relative displacement is generated between the purified water and the third filtering membrane, and the purpose of cleaning the third filtering membrane is achieved.

The elastic body may be connected at both end portions thereof to the first slider and the second slider, respectively, and may be stretched to store elastic potential energy when a rotation speed of the second filtering part is greater than a set threshold, wherein a distance between the first filtering membrane and the second filtering membrane may be reduced based on the elastic potential energy released from the elastic body when the rotation speed of the second filtering part is less than the set threshold. The corrugated pipe is provided with a drainage channel, the third cavity can be communicated with the first space through the drainage channel, and the extending direction of the drainage channel is approximately parallel to the radial direction of the corrugated pipe. When the rotation speed of the second filtering part is high, the component force of the centrifugal force generated by the first sliding block and the second sliding block can overcome the elastic acting force of the elastic body, at the moment, the first sliding block can slide along the first sliding groove, the second sliding block can slide along the second sliding groove, and the distance between the first filtering membrane and the second filtering membrane is increased. When the rotation speed is reduced such that the separation of the centrifugal force is less than the elastic force of the elastic body, the distance between the first filtering membrane and the second filtering membrane is reduced based on the release of the elastic potential energy of the elastic body, so that the vibration of the first filtering membrane and the second filtering membrane can be realized by the periodic change of the rotation speed of the second filtering portion. When the distance between the first filter membrane and the second filter membrane is reduced, the purified water in the third cavity can be discharged in time. When the distance between the first filtering membrane and the second filtering membrane is increased, the volume of the third cavity is increased, so that the pressure of the third cavity is reduced, at the moment, the first filtering membrane is in a shape protruding to the right, and the second filtering membrane is in a shape protruding to the left. And then make the in-process that the purified water flows along drainage channel, can wash away first filtration membrane and second filtration membrane's surface better, and then improve first filtration membrane and second filtration membrane's automatically cleaning ability.

In case the distance between the first filtering membrane and the second filtering membrane is increased, the length of the bellows can be increased so that the flow rate of the drainage channel is increased, or in case the distance between the first filtering membrane and the second filtering membrane is decreased, the length of the bellows can be decreased so that the flow rate of the drainage channel is decreased. Be provided with first inlet tube on the box, all be provided with the second inlet tube on half first shell and the half second shell, the second inlet tube can be according to the mode and the first inlet tube intercommunication that run through the second filter house. Drainage channel's opening can set up on the bellows, when the bellows shortened, the opening just can be because folding each other of bellows and reduce the cross section, strike so that first half shell clockwise rotation when intaking first breakwater and second breakwater, when half shell anticlockwise rotation of second, drainage channel's flow can increase, and then can accelerate purifying waste water from third cavity exhaust speed, and then can reach the effect that improves the water yield.

The invention adopts the first filter part and the second filter part, thereby having the following beneficial effects: 1. through the impact of intaking to first breakwater and second breakwater, can drive half first shell and the half shell of second and swing, and then make first filtration membrane and second filtration membrane form vibrations to can clear away accumulational dirt on it. In addition, whole process only need change the pressure of intaking through the suction pump and just can realize, need not set up driving motor alone for the swing of first half shell and second half shell, and then can reach the purpose that reduces the energy consumption. 2. Through the rotation of the second filtering portion, the purified water in the second space can be made to form a centrifugal force, and finally the speed of the purified water passing through the third filtering membrane is increased, namely, the filtering efficiency of the third filtering membrane can be enhanced at the moment. 3. And then when the rotational speed of second filter portion reduces, the purified water in the second space will keep original speed based on inertia, and then makes to produce relative displacement between purified water and the third filtration membrane to reach the mesh of clean third filtration membrane. 4. When the distance between the first filtering membrane and the second filtering membrane is increased, the volume of the third cavity is increased, so that the pressure of the third cavity is reduced, at the moment, the first filtering membrane is in a shape protruding to the right, and the second filtering membrane is in a shape protruding to the left. And then make the in-process that purified water flows along drainage channel, can wash away first filtration membrane and second filtration membrane's surface better, and then improve first filtration membrane and second filtration membrane's automatically cleaning ability. 5. When water is fed to impact the first water baffle and the second water baffle, the first half shell rotates clockwise, and when the second half shell rotates anticlockwise, the flow of the drainage channel can be increased, so that the speed of purified water discharged from the third cavity can be increased, and the effect of improving the water yield can be achieved. Therefore, the invention is a sewage recycling system with self-cleaning filtering membrane, energy saving and high water production efficiency for aquaculture, printing and electroplating chemical industry and the like.

Drawings

FIG. 1 is a schematic structural diagram of a reclaimed water recycling system for sewage of aquaculture, printing, dyeing, electroplating and chemical engineering and the like;

FIG. 2 is a schematic diagram of a splicing structure of the box body;

FIG. 3 is a schematic structural view of the first water baffle or the second water baffle 22;

fig. 4 is a schematic view of the arrangement of the first back flushing channel and the second back flushing channel.

Reference numerals: the first filtering part 1, the second filtering part 2, the box body 3, the first shell 1a, the second shell 2a, the first end 4, the second end 5, the first space 6, the second space 7, the first rotating shaft 8, the second rotating shaft 9, the first half shell 10, the second half shell 11, the corrugated pipe 12, the first filtering membrane 13, the second filtering membrane 14, the first cavity 15, the second cavity 16, the third cavity 17, the first water inlet pipe 18, the second water inlet pipe 19, the elastic body 20, the first water baffle 21, the second water baffle 22, the drainage channel 23, the third filtering membrane 24, the first sliding block 25, the second sliding block 26, the first sliding groove 27, the second sliding groove 28, the hydraulic telescopic rod 29, the first box body 3a, the second box body 3b, the threaded hole 30, the screw 31, the sealing strip 32, the first backwashing channel 33 and the second backwashing channel 34.

Detailed Description

The technical solution of the present invention is further described in detail below with reference to the following detailed description and the accompanying drawings:

example 1:

as shown in fig. 1 to 4, the invention provides a reclaimed water recycling system for sewage of cultivation, printing, dyeing, electroplating and chemical engineering and the like, which at least comprises a first filtering part 1, a second filtering part 2 and a box body 3. The first filter portion 1 is provided in the second filter portion 2. The second filter portion 2 is provided in the case 3. The first filtering part 1 and the second filtering part 2 are used for filtering sewage so as to filter out micro particles. The first filter portion 1 includes at least a first housing 1 a. The second filter portion 2 includes at least a second housing 2 a. The first casing 1a, the second casing 2a, and the case 3 may each have a hollow cylindrical shape. The outer diameter of the first housing 1a is smaller than the inner diameter of the second housing 2 a. The outer diameter of the second housing 2a is smaller than the inner diameter of the case 3. One end of the first housing 1a can be hinged to the first end 4 of the second housing 2 a. The other end of the first housing 1a can be hinged to the second end 5 of the second housing 2 a. When the first housing 1a is subjected to an external force, it can be rotationally swung about its hinge point. It will be appreciated that the contaminated water can be pre-treated to improve its quality prior to entering the first filter portion 1. For example, the pretreatment may include, but is not limited to, aeration treatment, anaerobic treatment, aerobic treatment, sterilization treatment, standing precipitation treatment, etc., thereby enabling the influent water to satisfy the influent water requirement of the first filtering portion 1.

A first space 6 in a closed shape can be formed between the first casing 1a and the second casing 2 a. A second space 7 can be formed between the second casing 2a and the case 3 in a closed state. The second casing 2a is disposed in the case 3 in such a manner as to be rotatable about its own central axis. Specifically, the first end 4 of the second housing 2a is provided with a first rotating shaft 8, and the second end 5 of the second housing 2a is provided with a second rotating shaft 9. Both ends of the box body 3 are provided with fixing holes. The first rotating shaft 8 and the second rotating shaft 9 are nested in the fixing holes, and the second housing 2a can be driven to rotate by driving the first rotating shaft 8 and/or the second rotating shaft 9. The first casing 1a includes at least a first half shell 10, a second half shell 11, and a bellows 12. The first half-shell 10 is hinged to the first end 4 of the second housing 2 a. The second half-shell 11 is hinged to the second end 5 of the second casing 2 a. One end of the bellows 12 is connected to the first half shell 10, and the other end of the bellows 12 is connected to the second half shell 11. The first half-shell 10 has a first filter membrane 13 disposed therein. A second filter membrane 14 is arranged in the second half-shell 11. For the sake of easy differentiation, the area between the first filter membrane 13 and the first half-shell 10 is named first cavity 15. The area between the second filter membrane 14 and the second half-shell 11 is a second cavity 16. The area between the first filter membrane 13 and the second filter membrane 14 is a third cavity 17. The tank 3 is provided with a first water inlet pipe 18. A second water inlet pipe 19 is provided on the second housing 2 a. The second inlet conduit 19 can communicate with the first cavity 15 and/or the second cavity 16. When the second housing 2a is rotated to align the first inlet pipe 18 and the second inlet pipe 19, the first inlet pipe 18 can be inserted into the second inlet pipe 19, and at this time, the external inlet water can sequentially pass through the first inlet pipe 18 and the second inlet pipe 19 into the first cavity 15 and the second cavity 16. The second housing 2a can be rotated again by pulling the first inlet conduit 18 out of the second inlet conduit 19. The inlet water in the first cavity 15 can enter the third cavity 17 after being filtered by the first filtering membrane 13. The inlet water in the second cavity 16 can enter the third cavity 17 after being filtered by the second filtering membrane 14. The third chamber 17 can communicate with the first space 6, so that the purified water in the third chamber 7 can enter the first space 6. Specifically, the first end 4 and the second end 5 are both provided with hydraulic telescopic rods 29 with the length capable of being increased or decreased. The first half-shell 10 and the second half-shell 11 are each hinged to their respective hydraulic telescopic rods 29. When the distance between first filtration membrane and the second filtration membrane reduces, the length of hydraulic telescoping rod can reduce.

The first filter house 1 further comprises a number of elastic bodies 20. The elastic body 20 may be a compression spring so that the length of the elastic body 20 can be increased or shortened. One end of the elastic body 20 is connected to the first half shell 10, and the other end of the elastic body 20 is connected to the second half shell 11. The second inlet conduit 19 can be arranged in an eccentric manner such that the central axis of the second inlet conduit 19 and the central axis of the first half-shell 10 or the second half-shell 11 do not coincide with one another. The first cavity 15 is provided therein with a first water guard 21. A second water baffle 22 is disposed in the second cavity 16. When water enters the first cavity 15 through the second water inlet tube 19, the water first impacts the first water deflector 21, thereby enabling the first half-shell 10 to rotate about its hinge point in a first direction. When water enters the second cavity 15 through the second water inlet tube 19, the water first impacts the second water deflector 22, so that the second half-shell 11 can rotate about its hinge point in the second direction. For example, as shown in FIG. 1, the first half shell 10 can rotate clockwise when the first splash plate 21 is impacted. The second half-shell 11 can rotate counterclockwise when the second apron 22 is impacted. At this time, the elastic body 20 near the upper side of the second casing 2a can be compressed to shorten the length, and the elastic body 20 near the lower side of the second casing 2a can be stretched to increase the length. In actual use, the first water inlet pressure of the first cavity 15 and the second water inlet pressure of the second cavity 16 can present a periodic variation state, wherein the respective maximum values of the first water inlet pressure and the second water inlet pressure can be equal, and the respective minimum values of the first water inlet pressure and the second water inlet pressure can be equal. For example, the first chamber 15 may be in communication with a first suction pump and the second chamber 16 may be in communication with a second suction pump. The regulation of the water inlet pressure can be realized by controlling the respective power or rotating speed of the first water suction pump and the second water suction pump. In first settlement time period, first pressure and the second pressure of intaking all can be the trend of crescent, and specific numerical value is from B crescent to A. In the second set time period, the first water inlet pressure and the second water inlet pressure both tend to be gradually reduced, and the specific numerical value is gradually reduced from A to B. Through the mode, the first shell 1a and the second shell 2a can be enabled to periodically rotate clockwise and anticlockwise alternately, and then the first filtering membrane 13 and the second filtering membrane 14 can be enabled to be in a vibration state, so that adsorbed substances on the first filtering membrane 13 and the second filtering membrane 14 can be timely removed, and the cleaning or replacement frequency of the first filtering membrane 13 and the second filtering membrane 14 can be reduced. When the impact force applied to the first water baffle 21 by the inflow water under the first inflow pressure is greater than the elastic potential energy of the elastic body 20, and the impact force applied to the second water baffle 22 by the inflow water under the second inflow pressure is greater than the elastic potential energy of the elastic body 20, the elastic body 20 close to the upper side of the second housing 2a can be compressed to shorten the length, and the elastic body 20 close to the lower side of the second housing 2a can be stretched to increase the length, so that the third housing 17 is in a trapezoidal shape with a narrow top and a wide bottom.

The third chamber 17 may be provided with a drain passage 23 so that the purified water can flow in a radial direction of the third chamber 17 to be discharged out of the third chamber 17. For example, the drain port of the drain passage 23 may be provided on the lower side of the corrugated tube 12, and as the length of the corrugated tube 12 increases, the opening area of the drain port will increase so that the amount of water discharged from the drain passage 23 increases. When the length of the corrugated tube 12 is reduced, the opening area of the drain port will be reduced so that the amount of water discharged from the drain passage 23 is reduced. That is, when the third cavity 17 has a trapezoidal shape with a narrow top and a wide bottom, the amount of water discharged from the water discharge passage 23 is reduced, and at this time, a vortex is formed in the third cavity 17. For example, as shown in fig. 1, when the purified water flows downward to be discharged from the third cavity 17, if the water discharge amount of the water discharge channel 23 is suddenly reduced, the excessive water cannot be discharged in time, and then a vortex is formed on the upstream surface, and the formed vortex flushes the first filtering membrane 13 and/or the second filtering membrane 14, thereby achieving the purpose of cleaning the filtering membranes. The first stage purified water after being filtered by the first filtering membrane 13 and/or the second filtering membrane 14 can enter the first space 6 through the drainage channel 23. The second housing 2a is provided with a number of third filter membranes 24 so that the first space 6 can communicate with the second space 7 through the third filter membranes 24. The first-stage purified water is filtered again by the third filtering membrane 24 to obtain second-stage purified water. That is, the second filter unit 2 may be composed of the second casing 2a and the third filter membrane 24. In actual use, the second housing 2a can be rotated at a variable speed. The centrifugal force generated by the rotation of the second housing 2a will increase the filtering speed of the third filtering membrane 24, thereby increasing the water production rate per unit time. For example, the second casing 2a rotates at the first speed for a third set time period. During a fourth set time period, the second casing 2a rotates at the second speed. The first speed and the second speed are different from each other. For example, the first speed may be greater than the second speed, so that when the second housing rotates at the second speed, the second stage purified water inside the second housing can keep flowing at the first speed due to inertia thereof, and at this time, a relative displacement will be generated between the second stage purified water and the third filtering membrane 24, so that the second stage purified water can flush and clean the third filtering membrane 24.

The first half-shell 10 is provided with a first slider 25 and the second half-shell 11 is provided with a second slider 26. A first slide groove 27 and a second slide groove 28 are provided on the inner wall of the second housing 2 a. The first slider 25 can be nested in the first sliding groove 27, so that the first slider 25 can slide along the extending direction of the first sliding groove 27. The second slide block 26 can be nested in the second slide groove 28, so that the second slide block 26 can slide along the extending direction of the second slide groove 28. The first chute 27 and the second chute 28 can be arranged in an inclined manner, so that when the second housing 2a rotates, the first slider 25 and the second slider 26 can both move based on their own centrifugal force, and further the distance between the first filter membrane 13 and the second filter membrane 14 can be increased, at which time the elastic body 20 will be stretched. When the rotation speed of the second casing 2a is reduced, the centrifugal force is reduced, and the elastic body 20 is restored such that the distance between the first filter membrane 13 and the second filter membrane 14 is reduced. When the rotation speed of the second housing 2a is periodically increased or decreased, the first filter membrane 13 and the second filter membrane 14 will generate vibrations. Meanwhile, when the distance between the first filtering membrane 13 and the second filtering membrane 14 increases, the volume of the third cavity 17 increases, and the flow of the second water inlet pipe 19 is kept unchanged at the moment, so that the pressure of the third cavity 17 is reduced, and at the moment, the first filtering membrane 13 and the second filtering membrane 14 can both present an outward convex shape which is bent towards the third cavity 17 based on the pressure difference. The formed vortex can more easily wash the convex first filtering membrane 13 and the convex second filtering membrane 14, so that a better descaling effect can be achieved.

As shown in fig. 3, each of the first water deflector 21 and the second water deflector 22 may have a hemispherical shell shape. The direction of extension of the first inlet conduit 19 can be tangential to the first splash plate 21 or the direction of extension of the first inlet conduit 19 can be tangential to the second splash plate 22. The first water guard plate 21 is disposed in such a manner that the opening direction thereof faces away from the first filter membrane 13. The second water deflector 22 is arranged with its opening direction facing away from the second filter membrane 14. For example, as shown in fig. 1, the opening direction of the first water fence 21 can be horizontally leftward. The opening direction of the second water deflector 22 can be horizontally rightward. And the inflow water can flow in the opposite direction of the inflow direction after being blocked by the first water baffle 21 or the second water baffle 22 so as to avoid direct impact on the first filtering membrane 13 or the second filtering membrane 14. For example, the inlet water moves horizontally to the right through the first inlet pipe 19 and contacts the first water guard 21, and after being blocked by the first water guard 21, the inlet water moves horizontally to the left. In this way, the first filtration membrane 13 or the second filtration membrane 14 can be directly impacted by the inflow water. In addition, the direction of the inlet water is changed, so that the inlet water can collide with the inner wall of the first housing 1a again, and the collision can clean the inner wall of the first housing 1a to avoid adhesion of dirt.

The first casing 1a, the second casing 2a, and the case 3 can each be semi-cylindrical. Namely, the first shell 1a, the second shell 2a and the box body 3 can be formed by splicing two shells after being butted. As shown in fig. 2, the case 3 is specifically described for the purpose of describing the splicing structure thereof. The case 3 may include a first case 3a and a second case 3 b. The respective splicing surfaces of the first box body 3a and the second box body 3b are respectively provided with a plurality of threaded holes 30. The first casing 3a and the second casing 3b can be coupled by inserting screws 31 into the screw holes 30. It will be understood that the first box 3a may be provided with a sealing strip 32 on the splicing face. Further, the joint between the first casing 3a and the second casing 3b can be sealed by the seal tape 32. Similarly, the first housing 2a and the first housing 1a may be similarly configured to be separated from each other. By disassembling the box 3, the second casing 2a and the first casing 1a, a convenient disassembly of the first filter membrane 13 and/or of the second filter membrane 14 is obtained.

As shown in fig. 4, a first back-flush passage 33 is provided between the second casing 2a and the tank 3 so that the first space 6 can communicate with the outside through the first back-flush passage 33. A second back-flushing channel 34 is arranged between the first casing 1a, the second casing 2a and the tank 3, so that the third chamber 17 can communicate with the external environment through the second back-flushing channel 34. Valves are provided in the first and

second backwash channels

33, 34 to enable manual or automatic closing thereof. When it is desired to clean the third filtering membrane 24, backwash water is injected from the drain hole of the case 3 into the second space 7 through the drain passage 23 to backwash the third filtering membrane 24, and the backwashed water can be discharged out of the first space 6 through the first backwash passage 33. Similarly, when the first filtering membrane 13 and the second filtering membrane 14 need to be cleaned, backwash water can be injected into the third cavity 17 through the second backwash channel 34, the first filtering membrane 13 and the second filtering membrane 14 can be backwashed under the condition that the drainage channel 23 is kept closed, and the backwashed water can be discharged out of the first cavity 15 or the second cavity 16 through the second water inlet pipe 19.

Claims

1. The reclaimed water recycling system for the aquaculture, printing and dyeing and electroplating chemical industry sewage at least comprises a first filtering part (1) and a second filtering part (2), characterized in that the first filter part (1) is arranged in the second filter part (2) to define a first space (6) between the first filter part (1) and the second filter part (2), the first filter part (1) comprises at least a first half-shell (10), a second half-shell (11) and a bellows (12), the first half-shell (10) is hinged to a first end (4) of the second filter part (2), the second half-shell (11) is hinged to a second end (5) of the second filter part (2), one end of the bellows (12) is connected to the first half-shell (10), the other end of the bellows (12) is connected to the second half-shell (11), the first half-shell (10) and the second half-shell (11) can both swing around their respective hinge points when subjected to an external force; a first filtering membrane (13) is arranged in the first half shell (10), and a second filtering membrane (14) is arranged in the second half shell (11) so as to divide the inner cavity of the first filtering part (1) into a first cavity (15), a second cavity (16) and a third cavity (17), wherein the area between the first filtering membrane (13) and the first half shell (10) is the first cavity (15), the area between the second filtering membrane (14) and the second half shell (11) is the second cavity (16), and the area between the first filtering membrane (13) and the second filtering membrane (14) is the third cavity (17);

a first water baffle (21) is arranged in the first cavity (15), a second water baffle (22) is arranged in the second cavity (16), wherein the first water baffle (21) is impacted after sewage enters the first cavity (15) so that the first half shell (10) rotates and swings around a hinge point of the first half shell, and the second water baffle (22) is impacted after sewage enters the second cavity (16) so that the second half shell (11) rotates and swings around the hinge point of the second half shell;

the first filtering part (1) further comprises an elastic body (20), one end of the elastic body (20) is connected to the first half shell (10), the other end of the elastic body (20) is connected to the second half shell (11), sewage inflow water can enter the first cavity (15) and the second cavity (16) simultaneously at the periodically-changed inflow pressure, wherein the first half-shell (10) is rotatable about its hinge point in a first direction during the gradual increase of the water inlet pressure, and the second half-shell (11) being rotatable about its hinge point in a second direction opposite to the first direction, during the progressive reduction of the water inlet pressure, the first half-shell (10) can rotate about its hinge point in the second direction, and the second half-shell (11) is rotatable about its hinging point in said first direction;

the system for recycling the reclaimed water of the aquaculture, printing and dyeing and electroplating chemical industry sewage further comprises a box body (3), the second filtering part (2) is arranged in the box body (3) in a self-rotating mode to limit a second space (7) between the second filtering part (2) and the box body (3), and a plurality of third filtering membranes (24) are arranged on the second filtering part (2);

a drainage channel (23) is arranged on the corrugated pipe (12), the third cavity (17) can be communicated with the first space (6) through the drainage channel (23), and the extension direction of the drainage channel (23) is parallel to the radial direction of the corrugated pipe (12);

be provided with first inlet tube (18) on box (3), first half shell (10) with all be provided with second inlet tube (19) on second half shell (11), second inlet tube (19) can be according to running through the mode of second filter house (2) with first inlet tube (18) intercommunication.

2. The system for recycling the aquaculture, printing and dyeing and electroplating chemical industry sewage as recited in claim 1, wherein the rotation speed of the second filtering part (2) can be changed periodically, so that the purified water entering the second space (7) can be displaced relative to the third filtering membrane (24) based on the inertia of the purified water when the rotation speed of the second filtering part (2) is reduced from the first speed to the second speed.