A sewage treatment apparatus having a rotatable membrane assembly

Abstract

The present application relates to a sewage treatment device with rotatable membrane assembly, comprising a pool body and a plurality of membrane assemblies uniformly distributed inside the pool body, the membrane assembly comprising an inner frame group, an outer frame and a plurality of membrane tubes, the inner frame group comprising an upper inner upper frame and a lower inner lower frame, the inner upper frame, the inner lower frame and the outer frame being horizontal and spiral-shaped, and the upper and lower structures being consistent; the outer surface of the membrane tube is loaded with microorganisms, the top of the membrane tube is slidingly connected to the inner upper frame, and the bottom of the membrane tube is slidingly connected to the inner lower frame, so that the membrane tube can move along the inner frame group, and different membrane tubes can contact sewage at different positions of the membrane assembly.

Description

TECHNICAL FIELD

[0001] The application belongs to the technical field of sewage treatment, and particularly relates to a sewage treatment device with rotatable membrane assemblies. BACKGROUND

[0002] The membrane assembly is a commonly used microbial load carrier. The specific surface area of the membrane material is large, which can provide a large load area. The membrane material has the advantages of air permeability, stable and reliable material, good toughness, etc., and can provide a large amount of stable and reliable load space for microorganisms. The pores of the membrane material can also provide oxygen for the microorganisms loaded on the membrane. At present, the membrane material and membrane assembly used as a load material generally adopt a traditional form, for example, the membrane material forms a curtain-shaped piece, and then is assembled to form a cube. The cube is fixed into shape by a frame, which is similar to the traditional beehive mode. In the membrane assembly of this form, the loaded membrane material is more, the load area is larger, and the biomass is larger. However, the cubic membrane assembly has the following disadvantages: the microorganisms on the outside contact more sewage, and the microorganisms on the inside contact less sewage, resulting in the condition that the pollution load on the outside is large and the pollution load on the inside is small. The lack of nutrients of the microorganisms on the inside will seriously affect their metabolic activities, leading to their death and shedding. Finally, the biomass of the whole membrane assembly is unevenly distributed, which affects the sewage treatment effect. SUMMARY

[0003] In view of the above problems, the application provides a sewage treatment device with rotatable membrane assemblies, which comprises a pool body and a plurality of membrane assemblies uniformly distributed in the pool body. The membrane assembly comprises an inner frame group, an outer frame and a plurality of membrane tubes. The inner frame group comprises an upper inner frame and a lower inner frame. The upper inner frame and the lower inner frame and the outer frame are all horizontally spiral-shaped, and the upper and lower structures are consistent. The outer surface of the membrane tube is loaded with microorganisms. The top of the membrane tube is slidingly connected to the upper inner frame, and the bottom of the membrane tube is slidingly connected to the lower inner frame, so that the membrane tube can move along the inner frame group, and different membrane tubes can contact sewage at different positions of the membrane assembly.

[0004] Optionally, the upper inner frame comprises a first spiral track and a second spiral track arranged horizontally. The first spiral track and the second spiral track are arranged side by side and spiral around the center of the upper inner frame.

[0005] The starting end of the first spiral track is located at the center of the upper inner frame, and then spirals outward in the clockwise or counterclockwise direction. The ending end of the first spiral track is close to the outer side of the upper inner frame.

[0006] The second spiral track is located outside the first spiral track, the interval between the first spiral track and the second spiral track is constant, the start of the second spiral track is connected to the start of the first spiral track through an arc track, then the second spiral track spirally winds outward along the same direction as the first spiral track, the end of the second spiral track is located on the outer side of the inner upper frame, and the end of the first spiral track is connected to the end of the second spiral track through an arc track.

[0007] Optionally, the inner lower frame comprises a third spiral track and a fourth spiral track arranged horizontally, the third spiral track and the fourth spiral track are arranged side by side and spirally wind around the center of the inner lower frame together;

[0008] The start of the third spiral track is located at the center of the inner lower frame, then spirally winds outward in a clockwise or counterclockwise direction, and the end of the third spiral track is close to the outer side of the inner lower frame.

[0009] The fourth spiral track is located outside the third spiral track, the interval between the third spiral track and the fourth spiral track is constant, the start of the fourth spiral track is connected to the start of the third spiral track through an arc track, then the fourth spiral track spirally winds outward along the same direction as the third spiral track, the end of the fourth spiral track is located on the outer side of the inner lower frame, and the end of the third spiral track is connected to the end of the fourth spiral track through an arc track.

[0010] Further optionally, the top end of one or more membrane tubes is connected to the first spiral track through an upper sliding block and can move circularly along the first spiral track and the second spiral track, the bottom end of one or more membrane tubes is connected to the third spiral track through a lower sliding block and can move circularly along the third spiral track and the fourth spiral track, and the number of the upper sliding blocks is equal to the number of the lower sliding blocks.

[0011] Further optionally, the inside of the upper sliding block is hollow, the bottom of the upper sliding block is provided with a plurality of membrane interfaces one, the number of the membrane interfaces one is equal to the number of the membrane tubes connected to the upper sliding block, each membrane interface one is connected to the top end of one membrane tube, and the top of the upper sliding block is provided with an upper interface.

[0012] The inside of the lower sliding block is hollow, the top of the lower sliding block is provided with a plurality of membrane interfaces two, the number of the membrane interfaces two is equal to the number of the membrane tubes connected to the lower sliding block, each membrane interface two is connected to the bottom end of one membrane tube, and the bottom of the lower sliding block is provided with a lower interface.

[0013] Further optionally, an exhaust pipe is arranged on the inner upper frame, the exhaust pipe is arranged along the upper surface of the first spiral track and the second spiral track, the bottom of the exhaust pipe is provided with a plurality of exhaust interfaces, the exhaust interfaces are one-to-one connected to the upper interfaces of the upper sliding blocks, so that the gas discharged from the membrane tubes is discharged into the exhaust pipe through the upper sliding blocks.

[0014] Further optional, the inner lower frame is provided with an air inlet pipe, the air inlet pipe is arranged along the lower surface of the third spiral track and the fourth spiral track, the bottom of the air inlet pipe is provided with a plurality of air inlet interfaces, the air inlet interfaces are one-to-one connected with the lower interfaces of the lower sliders, so that the gas input by the air inlet pipe is discharged into the membrane tube through the lower sliders.

[0015] Optionally, the membrane assembly further comprises a plurality of vertical traction rods, the traction rods penetrate the inner lower frame and the inner upper frame, one traction rod is detachably connected with one upper slider and one lower slider.

[0016] The top of the traction rod penetrates the water surface of the pool body and is connected with a top slider on the outer frame, the top slider drives the upper slider and the lower slider to move through the traction rod, thereby driving the membrane tube to move.

[0017] Optionally, the outer frame is arranged above the liquid surface of the pool body, the outer frame comprises a fifth spiral track and a sixth spiral track arranged horizontally, the fifth spiral track and the sixth spiral track are arranged side by side and spirally wound around the center of the outer frame, and the outer frame is concentrically arranged with the inner frame.

[0018] The beginning of the fifth spiral track is at the center of the outer frame, and then spirally winds outward in a clockwise or counterclockwise direction, and the end of the fifth spiral track is close to the outer side of the outer frame.

[0019] The sixth spiral track is entirely on the outside of the fifth spiral track, the distance between the fifth spiral track and the sixth spiral track is constant, the beginning of the sixth spiral track is connected to the beginning of the fifth spiral track through an arc track, and then the sixth spiral track spirally winds outward in the same direction as the fifth spiral track, the end of the sixth spiral track is on the outer side of the outer frame, and the end of the fifth spiral track is connected to the end of the sixth spiral track through an arc track. The upper and lower structures of the first spiral track and the fifth spiral track correspond consistently, and the upper and lower structures of the second spiral track and the sixth spiral track correspond consistently.

[0020] Optionally, the outer side of the inner upper frame is connected with a plurality of connecting rods, the connecting rods are evenly arranged along the circumference of the inner upper frame, the connecting rods are vertically arranged and the bottom ends are connected with the outer side of the inner lower frame, and the upper parts of the connecting rods are connected with the outer side of the outer frame; the top of the connecting rod is higher than the outer frame and is parallel to the rotating shaft of the motor, and the motor is arranged above the outer frame and is used to drive the entire membrane assembly to rotate through the connecting rods.

[0021] Optionally, the traction rod is hollow and the top end and the bottom end are open, so as to avoid accumulation of sludge inside the traction rod; the bottom of the traction rod exceeds the inner lower frame and extends to the lower part of the pool body, the part of the traction rod below the inner lower frame is called a stirring part, one side of the stirring part is provided with a hollow strip, and the length of the hollow strip is slightly less than the length of the stirring part.

[0022] The inside of the traction rod is provided with a pulling rod, and the bottom of the pulling rod is provided with a stirring paddle. By controlling the lifting and lowering of the pulling rod, the upward and downward movement of the stirring paddle can be realized. BRIEF DESCRIPTION OF DRAWINGS

[0023] Figure 1 is a structural schematic diagram of the membrane assembly (the top / upper / lower slider and the exhaust / air inlet pipe are omitted for clarity);

[0024] Figure 2 is a schematic diagram of the inner upper frame (the upper slider and the exhaust pipe are omitted);

[0025] Figure 3 is a schematic diagram of the connection of the membrane tube and the upper slider and the lower slider;

[0026] Figure 4 is a schematic diagram of the connection of the traction rod, the outer frame, the inner upper frame and the inner lower frame.

[0027] In the drawings, 1 is a stirring paddle, 2 is a membrane assembly, 3 is an outer frame, 4 is a membrane tube, 5 is an inner upper frame, 6 is an inner lower frame, 7 is a first spiral track, 8 is a second spiral track, 9 is a third spiral track, 10 is a fourth spiral track, 11 is a fifth spiral track, 12 is a sixth spiral track, 13 is an upper slider, 14 is a lower slider, 15 is a top slider, 16 is a membrane interface one, 17 is an upper interface, 18 is a membrane interface two, 19 is a lower interface, 20 is an exhaust pipe, 21 is an air inlet pipe, 22 is a traction rod, 23 is a hollow strip, 24 is a pulling rod, and 25 is a connecting rod. DETAILED DESCRIPTION

[0028] The embodiment provides a sewage treatment device with a rotatable membrane assembly, as shown in the drawings, comprising a pool body and a plurality of membrane assemblies 2 uniformly distributed inside the pool body, the membrane assembly 2 comprising an inner frame group, an outer frame 3 and a plurality of membrane tubes 4, the inner frame group comprising an upper inner upper frame 5 and a lower inner lower frame 6, the inner upper frame 5 and the inner lower frame 6 and the outer frame 3 are horizontally spiral, and the upper and lower structures are consistent. Figures 1-4 The outer surface of the membrane tube 4 is loaded with microorganisms, the top of the membrane tube 4 is slidingly connected to the inner upper frame 5, and the bottom of the membrane tube is slidingly connected to the inner lower frame 6, so that the membrane tube can move along the inner frame group, and different membrane tubes can contact sewage at different positions of the membrane assembly.

[0029] The material of the membrane tube is determined according to the requirement of sewage treatment, for example, heavy ion microporous membrane, PVDF hollow fiber membrane and PDMS hollow fiber membrane.

[0030] Optionally, the inner upper frame 5 comprises a horizontally arranged first spiral track 7 and a second spiral track 8, the first spiral track 7 and the second spiral track 8 are arranged side by side, and both spiral around the center of the inner upper frame 5;

[0031] The start of the first spiral track 7 is at the center of the inner upper frame 5, and then spirals outward in a clockwise or counterclockwise direction, and the end of the first spiral track 7 is close to the outer side of the inner upper frame 5.

[0032] The second spiral track 8 is entirely outside the first spiral track 7, and the interval between the first spiral track 7 and the second spiral track 8 is constant, the start of the second spiral track 8 is connected to the start of the first spiral track 7 through an arc track, and then the second spiral track 8 spirals outward in the same direction as the first spiral track 7, and the end of the second spiral track 8 is on the outer side of the inner upper frame 5, and the end of the first spiral track 7 is connected to the end of the second spiral track 8 through an arc track.

[0033] Optionally, the inner lower frame 6 comprises a third spiral track 9 and a fourth spiral track 10 arranged horizontally, and the third spiral track 9 and the fourth spiral track 10 are arranged side by side and spirally arranged around the center of the inner lower frame 6.

[0034] The start of the third spiral track 9 is at the center of the inner lower frame 6, and then spirals outward in a clockwise or counterclockwise direction, and the end of the third spiral track 9 is close to the outer side of the inner lower frame 6.

[0035] The fourth spiral track 10 is entirely outside the third spiral track 9, and the interval between the third spiral track 9 and the fourth spiral track 10 is constant, the start of the fourth spiral track 10 is connected to the start of the third spiral track 9 through an arc track, and then the fourth spiral track 10 spirals outward in the same direction as the third spiral track 9, and the end of the fourth spiral track 10 is on the outer side of the inner lower frame 6, and the end of the third spiral track 9 is connected to the end of the fourth spiral track 10 through an arc track. The first spiral track 7 and the third spiral track 9 correspond to each other in the upper and lower structures, and the second spiral track 8 and the fourth spiral track 10 correspond to each other in the upper and lower structures.

[0036] Further, the membrane tubes 4 on the membrane assembly are all arranged vertically and arranged along the first spiral track 7 and the second spiral track 8, and any adjacent membrane tubes do not overlap and intersect with each other.

[0037] The top end of one or more membrane tubes 4 is connected to the first spiral track 7 through an upper sliding block 13 and can move circularly along the first spiral track 7 and the second spiral track 8, and the bottom end of one or more membrane tubes is connected to the third spiral track 9 through a lower sliding block 14 and can move circularly along the third spiral track 9 and the fourth spiral track 10, and the number of the upper sliding blocks 13 and the lower sliding blocks 14 is equal.

[0038] Further, the upper slide 13 is hollow inside, and the bottom of the upper slide 13 is provided with a plurality of membrane interfaces 16, the number of the membrane interfaces 16 being equal to the number of the membrane tubes connected to the upper slide 13, each membrane interface 16 being connected to the top end of a membrane tube, and the top of the upper slide 13 is provided with an upper interface 17;

[0039] The lower slide 14 is hollow inside, and the top of the lower slide 14 is provided with a plurality of membrane interfaces 18, the number of the membrane interfaces 18 being equal to the number of the membrane tubes connected to the lower slide 14, each membrane interface 18 being connected to the bottom end of a membrane tube, and the bottom of the lower slide 14 is provided with a lower interface 19.

[0040] Further, the inner upper frame 5 is provided with an exhaust pipe 20, the exhaust pipe 20 being arranged along the upper surfaces of the first spiral track 7 and the second spiral track 8, the winding structure of the exhaust pipe 20 being consistent with the structures of the first spiral track 7 and the second spiral track 8, and the exhaust pipe 20 forms a closed loop, i.e., the exhaust pipe 20 is not continuous at the beginning and the end of the first spiral track 7;

[0041] The bottom of the exhaust pipe 20 is provided with a plurality of exhaust interfaces, the exhaust interfaces being connected to the upper interfaces 17 of the upper slides 13 one by one, so that the gas discharged from the membrane tubes is discharged into the exhaust pipe 20 through the upper slides 13, and the exhaust pipe 20 is connected to an air pipe at any position and extends above the water surface to discharge the gas.

[0042] Further, the inner lower frame 6 is provided with an air inlet pipe 21, the air inlet pipe 21 being arranged along the lower surfaces of the third spiral track 9 and the fourth spiral track 10, the winding structure of the air inlet pipe 21 being consistent with the structures of the third spiral track 9 and the fourth spiral track 10, and the air inlet pipe 21 forms a closed loop, i.e., the air inlet pipe 21 is not continuous at the beginning and the end of the third spiral track 9;

[0043] The bottom of the air inlet pipe 21 is provided with a plurality of air inlet interfaces, the air inlet interfaces being connected to the lower interfaces 19 of the lower slides 14 one by one, so that the gas input from the air inlet pipe 21 is discharged into the membrane tubes through the lower slides 14, and the air inlet pipe 21 is connected to an air pipe at any position and extends above the water surface to input the gas.

[0044] Optionally, the membrane assembly 2 further comprises a plurality of vertical traction rods 22, the traction rods 22 penetrating the inner lower frame 6 and the inner upper frame 5, one traction rod 22 being detachably connected to one upper slide 13 and one lower slide 14, and the number of the traction rods 22 being not more than the number of the upper slides 13;

[0045] The top of the traction rod 22 penetrates the water surface of the pool body and is connected to the top slide 15 on the outer frame 3, the top slide 15 driving the upper slide 13 and the lower slide 14 to move through the traction rod 22, and further driving the membrane tubes to move.

[0046] Further, the plurality of upper sliding blocks 13 are connected in series by a string, for example, 2-5 upper sliding blocks 13 are connected in series by a string, the distance between adjacent upper sliding blocks 13 meets the requirement of uniform arrangement of the membrane tube; the upper sliding block 13 at the head of the string is connected to a traction rod 22, and the traction rod 22 can drive the upper sliding blocks 13 in the string to move along the inner upper frame 5.

[0047] The plurality of lower sliding blocks 14 are connected in series by a string, for example, 2-5 lower sliding blocks 14 are connected in series by a string, the distance between adjacent lower sliding blocks 14 meets the requirement of uniform arrangement of the membrane tube; the lower sliding block 14 at the head of the string is connected to a traction rod 22, and the traction rod 22 can drive the lower sliding blocks 14 in the string to move along the inner lower frame 6.

[0048] Since the traction rod 22 is vertically arranged, the number and position relationship of the string of upper sliding blocks 13 and the string of lower sliding blocks 14 correspond to each other.

[0049] Optionally, the outer frame 3 is arranged above the liquid surface of the pool body, and the outer frame 3 comprises a fifth spiral track 11 and a sixth spiral track 12 arranged horizontally, the fifth spiral track 11 and the sixth spiral track 12 are arranged side by side and spirally wound with the center of the outer frame 3 as the center; the outer frame 3 is concentrically arranged with the inner frame;

[0050] The initial end of the fifth spiral track 11 is located at the center of the outer frame 3, and then spirally winds outward in the clockwise or counterclockwise direction, and the terminal end of the fifth spiral track 11 is close to the outer side of the outer frame 3.

[0051] The sixth spiral track 12 is located on the outer side of the fifth spiral track 11, the distance between the fifth spiral track 11 and the sixth spiral track 12 is constant, the initial end of the sixth spiral track 12 is connected to the initial end of the fifth spiral track 11 through an arc track, and then the sixth spiral track 12 spirally winds outward in the same direction as the fifth spiral track 11, the terminal end of the sixth spiral track 12 is located on the outer side of the outer frame 3, and the terminal end of the fifth spiral track 11 is connected to the terminal end of the sixth spiral track 12 through an arc track. The upper and lower structures of the first spiral track 7 and the fifth spiral track 11 correspond consistently, and the upper and lower structures of the second spiral track 8 and the sixth spiral track 12 correspond consistently.

[0052] Further, the traction rod 22 is connected to the fifth spiral track 11 and the sixth spiral track 12 through a top sliding block 15, the traction rod 22 is connected to the top sliding block 15, and the connection and driving form of the top sliding block 15 and the outer frame 3 are prior art, which is not limited in the present application.

[0053] In use, the top slider 15 drives the corresponding upper slider 13 and lower slider 14 along the inner upper frame 5 and inner lower frame 6 through the traction rod 22. For example, when a membrane tube is initially located at the outermost side of the membrane assembly (the end of the first spiral track 7 and third spiral track 9), the upper slider 13 and lower slider 14 connected to the membrane tube are driven by the corresponding traction rod 22 (the traction rod 22 is driven by the corresponding top slider 15) to move along the first spiral track 7 and third spiral track 9 spirally towards the inside of the membrane assembly, while keeping the membrane tube vertical.

[0054] When the membrane tube moves to the center of the membrane assembly, the top slider 15 moves from the start of the fifth spiral track 11 to the start of the sixth spiral track 12 through the arc track of the outer frame 3, and correspondingly, the upper slider 13 moves from the start of the first spiral track 7 to the start of the second spiral track 8 through the arc track of the inner upper frame 5, and the lower slider 14 moves from the start of the third spiral track 9 to the start of the fourth spiral track 10 through the arc track of the inner lower frame 6, and then the traction rod 22 moves along the sixth spiral track 12, and the membrane tube moves along the second spiral track 8 (the fourth spiral track 10).

[0055] When the membrane tube moves to the outermost side of the membrane assembly, the top slider 15 moves from the end of the sixth spiral track 12 to the end of the fifth spiral track 11 through the arc track of the outer frame 3, and correspondingly, the upper slider 13 moves from the end of the second spiral track 8 to the end of the first spiral track 7 through the arc track of the inner upper frame 5, and the lower slider 14 moves from the end of the fourth spiral track 10 to the end of the third spiral track 9 through the arc track of the inner lower frame 6, and then the traction rod 22 moves along the fifth spiral track 11, and the membrane tube moves along the first spiral track 7 (the third spiral track 9) towards the center of the membrane assembly.

[0056] All membrane tubes move from the outside to the center and then from the center to the outside along the above-mentioned tracks in the above-mentioned manner, and this cycle is repeated, so that each membrane tube can pass through each position of the membrane assembly, and the contact between the membrane tube and the sewage changes constantly, which makes the microbial load on the outer side of all membrane tubes tend to be uniform, and further stabilizes the treatment condition and the water quality of the effluent.

[0057] Optionally, the outer side of the inner upper frame 5 is connected to a plurality of connecting rods 25, the plurality of connecting rods 25 are evenly arranged along the circumference of the inner upper frame 5, the connecting rods 25 are vertically arranged and the bottom ends of the connecting rods 25 are connected to the outer side of the inner lower frame 6, and the upper parts of the connecting rods 25 are connected to the outer side of the outer frame 3; the top of the connecting rod 25 is higher than the outer frame 3 and is parallel to the rotating shaft of the motor, and the motor is arranged above the outer frame 3 and is used to drive the entire membrane assembly to rotate through the connecting rod 25.

[0058] Since the membrane assembly is helical, an opening is formed on the outer side of the membrane assembly, the top of the opening corresponds to the end of the inner upper frame 5, and the bottom of the opening corresponds to the end of the inner lower frame 6. The fixed helical direction of the membrane assembly is the direction of rotation of the center of the membrane assembly along the inner upper frame 5 (the inner lower frame 6) towards the outside of the membrane assembly, and the membrane assembly is controlled to rotate along the fixed helical direction by the motor and the connecting rod 25, so that the sewage can continuously flow into the membrane assembly from the opening, which is beneficial to the flow and update of the water in the membrane assembly.

[0059] Optionally, the traction rod 22 is hollow, and the top end and the bottom end are both open, so as to avoid the accumulation of sludge in the traction rod 22; the bottom of the traction rod 22 extends to the lower part of the pool body beyond the inner lower frame 6, and the part of the traction rod 22 below the inner lower frame 6 is referred to as the stirring part; one side of the stirring part is provided with a hollow strip 23, and the length of the hollow strip 23 is slightly less than the length of the stirring part.

[0060] The inside of the traction rod 22 is provided with a lifting rod 24, and the bottom of the lifting rod 24 is provided with the stirring paddle 1, so that the stirring paddle 1 can be lifted up and down by controlling the lifting rod 24 to rise and fall.

[0061] Further optionally, the stirring paddle 1 is arranged obliquely, and the side of the stirring paddle 1 facing the inside of the membrane assembly is inclined upward, and the straight-line distance between the top edge of the side and the center of the membrane assembly is greater than the straight-line distance between the bottom edge and the center of the membrane assembly.

[0062] In order to improve the problem of poor flow of sewage at the center of the membrane assembly, the stirring paddle 1 below the membrane assembly is designed, when the traction rod 22 is on the outer side of the membrane assembly, the traction rod 22 will move helically into the inside of the membrane assembly, the side of the traction rod 22 facing the inside of the membrane assembly is provided with the hollow strip 23, the stirring paddle 1 extends out of the traction rod 22 from the hollow strip 23 and points to the inside of the membrane assembly. Then, in the process of moving the traction rod 22 into the inside of the membrane assembly, the lifting rod 24 is pulled upward by mechanical action or manual action, so that the stirring paddle 1 moves upward along the hollow strip 23, and the speed of the stirring paddle 1 moving upward is coordinated with the speed of the traction rod 22 moving, so that the time for the traction rod 22 to move from the outside of the membrane assembly to the center is just equal to the time for the stirring paddle 1 to rise from the bottom to the top of the traction rod 22. The stirring paddle 1 rises while the traction rod 22 rotates helically, so that an upward helical water flow is formed below the membrane assembly, which promotes the sewage in the lower part of the pool body to enter the center of the membrane assembly along the water flow, and the stirring paddle 1 can continuously disturb the water flow and supply water to the center as the traction rod 22 continuously moves to the center. After the water flow enters the inside of the membrane assembly, the rotation of the membrane assembly itself and the movement of the membrane tube can form a more complex water flow, promote the contact between the sewage and the microorganisms, and improve the sewage treatment efficiency.

[0063] When the traction rod 22 moves to the outside of the membrane assembly through the center of the circle, the hollow strip 23 faces the outside of the membrane assembly, and the pull rod 24 is quickly pressed down, so that the stirring paddle 1 quickly moves to the bottom of the hollow strip 23, and the influence on the spiral upward water flow is minimized. The stirring paddle 1 is at the bottom of the traction rod 22, and moves outward with the traction rod 22, which can stir the sewage in the lower part of the pool body and promote the balance of water quality in the pool body.

Claims

1. A sewage treatment apparatus having a rotatable membrane assembly, characterised in that, The application relates to a sewage treatment device, which comprises a pool body and a plurality of membrane assemblies uniformly distributed in the pool body, wherein the membrane assemblies comprise an inner frame group, an outer frame and a plurality of membrane tubes, the inner frame group comprises an upper inner frame and a lower inner frame, the upper inner frame and the lower inner frame are horizontally spiral-shaped, and the upper and lower structures are consistent; the outer surface of the membrane tube is loaded with microorganisms, the top of the membrane tube is slidably connected with the upper inner frame, and the bottom of the membrane tube is slidably connected with the lower inner frame, so that the membrane tube can move along the inner frame group, and different membrane tubes can contact sewage at different positions of the membrane assembly. The upper inner frame comprises horizontally arranged first and second spiral tracks, the first and second spiral tracks are arranged side by side and spirally wound around the center of the upper inner frame; the starting end of the first spiral track is located at the center of the upper inner frame, then spirally wound outward in the clockwise or counterclockwise direction, and the ending end of the first spiral track is close to the outer side of the upper inner frame; the second spiral track is located on the outer side of the first spiral track, the interval between the first spiral track and the second spiral track is constant, the starting end of the second spiral track is connected with the starting end of the first spiral track through an arc track, then the second spiral track is spirally wound outward in the same direction as the first spiral track, the ending end of the second spiral track is located on the outer side of the upper inner frame, and the ending end of the first spiral track is connected with the ending end of the second spiral track through an arc track; the third and fourth spiral tracks of the lower inner frame are arranged side by side and spirally wound around the center of the lower inner frame; the starting end of the third spiral track is located at the center of the lower inner frame, then spirally wound outward in the clockwise or counterclockwise direction, and the ending end of the third spiral track is close to the outer side of the lower inner frame; the fourth spiral track is located on the outer side of the third spiral track, the interval between the third spiral track and the fourth spiral track is constant, the starting end of the fourth spiral track is connected with the starting end of the third spiral track through an arc track, then the fourth spiral track is spirally wound outward in the same direction as the third spiral track, the ending end of the fourth spiral track is located on the outer side of the lower inner frame, and the ending end of the third spiral track is connected with the ending end of the fourth spiral track through an arc track; the top end of one or a plurality of membrane tubes is connected with the first spiral track through an upper sliding block and can move circularly along the first and second spiral tracks; the bottom end of one or a plurality of membrane tubes is connected with the third spiral track through a lower sliding block and can move circularly along the third and fourth spiral tracks; and the number of the upper sliding blocks is equal to that of the lower sliding blocks.

2. The sewage treatment device having a rotatable membrane assembly according to claim 1, wherein, The upper sliding block is hollow, the bottom of the upper sliding block is provided with a plurality of membrane interfaces I, the number of the membrane interfaces I is equal to the number of the membrane tubes connected with the upper sliding block, each membrane interface I is connected with the top end of one membrane tube, and the top of the upper sliding block is provided with an upper interface. The lower sliding block is hollow, the top of the lower sliding block is provided with a plurality of membrane interfaces II, the number of the membrane interfaces II is equal to the number of the membrane tubes connected with the lower sliding block, each membrane interface II is connected with the bottom end of one membrane tube, and the bottom of the lower sliding block is provided with a lower interface.

3. The sewage treatment device with rotatable membrane assembly of claim 2, wherein, The inner upper frame is provided with an exhaust pipe, the exhaust pipe is arranged along the upper surfaces of the first spiral track and the second spiral track, the bottom of the exhaust pipe is provided with a plurality of exhaust interfaces, the exhaust interfaces are one-to-one connected with the upper interfaces of the upper sliders, so that the gas discharged from the membrane tube is discharged into the exhaust pipe through the upper sliders; The inner lower frame is provided with an air inlet pipe, the air inlet pipe is arranged along the lower surfaces of the third spiral track and the fourth spiral track, the bottom of the air inlet pipe is provided with a plurality of air inlet interfaces, the air inlet interfaces are one-to-one connected with the lower interfaces of the lower sliders, so that the gas input from the air inlet pipe is discharged into the membrane tube through the lower sliders.

4. The sewage treatment device having a rotatable membrane assembly according to claim 1, wherein, The membrane assembly further comprises a plurality of vertical traction rods, the traction rods penetrate the inner lower frame and the inner upper frame, one traction rod is detachably connected with one upper slider and one lower slider; The top of the traction rod penetrates the water surface of the pool body and is connected with a top slider on the outer frame, the top slider drives the upper slider and the lower slider to move through the traction rod, and then drives the membrane tube to move.

5. The sewage treatment device having a rotatable membrane assembly according to claim 1, wherein, The outer frame is arranged above the liquid surface of the pool body, the outer frame comprises horizontally arranged fifth spiral tracks and sixth spiral tracks, the fifth spiral tracks and the sixth spiral tracks are arranged side by side and spirally arranged around the center of the outer frame; the outer frame and the inner frame are concentrically arranged; The beginning of the fifth spiral track is located at the center of the outer frame, and then spirally outward in the clockwise or counterclockwise direction, the end of the fifth spiral track is close to the outer side of the outer frame; The sixth spiral track is located on the outer side of the fifth spiral track, the distance between the fifth spiral track and the sixth spiral track is constant, the beginning of the sixth spiral track is connected with the beginning of the fifth spiral track through an arc track, and then the sixth spiral track spirally outward in the same direction as the fifth spiral track, the end of the sixth spiral track is located on the outer side of the outer frame, and the end of the fifth spiral track is connected with the end of the sixth spiral track through an arc track.

6. The sewage treatment device having a rotatable membrane assembly according to claim 1, wherein, The outer side of the inner upper frame is connected with a plurality of connecting rods, the connecting rods are evenly arranged along the circumference of the inner upper frame, the connecting rods are vertically arranged and the bottom ends are connected with the outer side of the inner lower frame, the upper parts of the connecting rods are connected with the outer side of the outer frame; the top of the connecting rod is higher than the outer frame and is connected with the rotating shaft of the motor, the motor is arranged above the outer frame and is used for driving the whole membrane assembly to rotate through the connecting rod.

7. The sewage treatment device having a rotatable membrane assembly according to claim 4, wherein, The traction rod is hollow and the top end and the bottom end are open, so as to avoid accumulation of sludge in the traction rod; the bottom of the traction rod exceeds the inner lower frame and extends to the lower part of the pool body, the part of the traction rod below the inner lower frame is called a stirring part, one side of the stirring part is provided with a hollow strip, and the length of the hollow strip is slightly less than the length of the stirring part; The inside of the traction rod is provided with a lifting rod, the bottom of the lifting rod is provided with a stirring paddle, and the lifting rod is controlled to rise and fall, so as to realize the upward movement and the downward movement of the stirring paddle.

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