Dot-matrix flat membrane assembly

Abstract

The utility model discloses a dot-matrix type flat sheet membrane component, which belongs to the technical field of environment-friendly sewage treatment equipment, comprises a dot-matrix type vertical hard flat sheet membrane component, a dot-matrix type single-sheet flexible sheet flat sheet membrane component and a dot-matrix type multi-sheet integrated flexible sheet flat sheet membrane component in physical forms, and structurally comprises a membrane, a support plate and a mesh, the supporting plate is arranged in the middle, the meshes are arranged on the two faces of the supporting plate, the membranes are arranged on the outer sides of the meshes, the peripheries of the membranes and the meshes are connected with the supporting plate in a welding or bonding mode, and welding points or bonding points are arranged on the membranes every 20-80 mm. When the equipment is in a non-negative-pressure suction state, the outward bulging force of the diaphragm can be restrained by a welding point or a bonding point, so that the diaphragm cannot be wholly expanded outwards, and as the diaphragm is small in bulging amplitude, the probability of cracks and holes on the edge of the diaphragm can be reduced, and the probability of stabilizing the quality of effluent can be greatly improved.

Description

TECHNICAL FIELD

[0001] The utility model relates to a flat membrane module belongs to the sewage treatment equipment technical field of environmental protection, especially a dot matrix flat membrane module applied in the membrane bioreactor. BACKGROUND

[0002] At present, the membrane bioreactor (MBR) technology is widely used in sewage treatment. The membrane bioreactor is a new type of wastewater treatment system combining membrane separation technology and biological treatment technology. The membrane module replaces the secondary sedimentation tank at the end of the traditional biological treatment technology, maintains high activated sludge concentration in the bioreactor, and improves the organic load of biological treatment, thereby reducing the land occupation of the sewage treatment facility and reducing the amount of excess sludge by maintaining low sludge load. The flat membrane module is one of the most important membrane modules in the membrane bioreactor. The flat membrane module includes a flat membrane assembly, a membrane frame, and an aeration pipe. The physical form of the flat membrane assembly has many forms. Currently, the mainstream forms include a vertical hard plate flat membrane assembly, a single-piece soft flat membrane assembly, and a multi-piece integrated soft flat membrane assembly.

[0003] The vertical hard plate flat membrane assembly, as shown in Figure 5 , is composed of a vertical support plate with a thickness of 5 to 10 mm, a mesh, and a membrane. The support plate, also known as a flow guide plate, has longitudinal and transverse grooves on both sides for water flow. The mesh is composed of two pieces, one on each side of the support plate. The membrane is composed of two pieces, one on each side of the mesh. The four sides are welded or bonded to the support plate. At least one water outlet is provided on the top or side of the support plate. The water outlet is connected to the cavity formed by the middle of the two membrane pieces. During operation, the water that passes through the membrane and enters the interior of the membrane assembly flows out through the water outlet.

[0004] During operation, as shown in Figure 9 , the membrane frame is placed in the sewage tank. The membrane frame is composed of an upper horizontal pipe, a lower horizontal pipe, and a vertical pipe. The upper horizontal pipe and the lower horizontal pipe are fixedly connected by the vertical pipe. The aeration pipe is arranged below the lower horizontal pipe and is connected to the aeration fan through a pipeline. The vertical recessed plate is arranged between the upper horizontal pipe and the lower horizontal pipe. The vertical hard plate flat membrane assembly is vertically installed in the recess of the vertical recessed plate of the membrane frame. The water outlet of the membrane assembly is connected to the water collector through a hose. The water production pump is arranged at the top of the sewage tank. One end of the water production pipe is connected to the liquid inlet of the water production pump, and the other end is connected to the water collector. One end of the clean water pipe is connected to the liquid outlet of the water production pump, and the other end is connected to the clean water tank. During water production, the water surface of the sewage tank is higher than the top of the membrane assembly. First, start the aeration fan. Air bubbles flow out of the through hole of the aeration pipe, contact the membrane surface during the upward process, and carry away the pollutants on the membrane surface. Then start the water production pump. Through the negative pressure suction of the water production pump, the pollutants in the sewage and the clean water are separated at the membrane. The pollutants are trapped outside the membrane, and the clean water enters the inside of the membrane. The clean water then flows into the water collector, the water production pump, and the clean water pipe through the water outlet, and finally enters the clean water tank.

[0005] Single sheet flat sheet membrane module, as shown in Figure 6 , Figure 7 : composed of mesh and membrane, the middle part of the single sheet flat sheet membrane module is provided with a mesh, two membranes are respectively arranged on the two sides of the mesh, and the four sides of the two membranes are connected together, or composed of a support plate, a mesh and a membrane, a support plate with a thickness of 0.5 mm to 1.5 mm is arranged in the middle part, two meshes are respectively arranged on the two sides of the support plate, and two membranes are respectively arranged on the outer sides of the meshes and connected with the support plate through welding or bonding; at least one water outlet is arranged on the membrane of the single sheet flat sheet membrane module, a plurality of single sheet flat sheet membrane modules are arranged side by side and connected together through water outlet pipes, the water outlet pipes are composed of a center hole pipe, a compression short pipe or a sealing ring, a top plate and a nut, a screw thread is arranged on the outer side of the two ends of the center hole pipe, a through hole is arranged in the middle part, the center hole pipe passes through the water outlet of the single sheet flat sheet membrane module, the compression short pipe or the sealing ring is arranged on the outer side of the center hole pipe, a plurality of groups of single sheet flat sheet membrane modules are arranged side by side on the center hole pipe between two single sheet flat sheet membrane modules, the top plate is arranged on the left side of the leftmost single sheet flat sheet membrane module and the right side of the rightmost single sheet flat sheet membrane module, the outer side of the top plate is tightened through the nut to form a sealed state between the compression short pipe or the sealing ring and the single sheet flat sheet membrane module, so that the center hole pipe is isolated from the outer side of the single sheet flat sheet membrane module, and a water production pump is connected with the center hole pipe through a pipeline in operation, and the water passing through the membrane and entering the inside of the membrane module flows out through the center hole pipe.

[0006] Multi-piece integrated soft flat sheet membrane module, as shown in Figure 8 : composed of a membrane unit and a water collecting cavity, the membrane unit is provided with at least two, and the water collecting cavity is vertically arranged at one end or both ends of the membrane unit, the membrane unit includes a support plate, a mesh and a membrane, the mesh is provided with two, which are respectively arranged on the two sides of the support plate, the membrane is provided with two, which are respectively arranged on the outer sides of the meshes, the side close to the water collecting cavity of the membrane is connected with the water collecting cavity through epoxy resin or polyurethane glue pouring, and the other sides are connected with the support plate through welding or bonding, the cavity on the inner side of the membrane unit is communicated with the cavity on the inner side of the water collecting cavity, the water outlet is arranged on the top of the water collecting cavity, a water production pump is connected with the water outlet of the water collecting cavity through a pipeline, and the water passing through the membrane and entering the inside of the membrane module flows out through the water outlet on the upper part of the water collecting cavity in operation.

[0007] The existing flat sheet membrane module still has the following deficiencies:

[0008] The flat sheet membrane is usually operated by being immersed in a sewage tank or a membrane tank. When the membrane is in a non-negative pressure suction state, the water production pump connected with the water outlet of the flat sheet membrane assembly and the pipeline connected with the water production pump are located higher than the water surface of the sewage tank or the membrane tank where the flat sheet membrane assembly is located. Under the action of atmospheric pressure, the pressure in the membrane is greater than the pressure outside the membrane. The water in the water production pump and the pipeline connected therewith falls. At this time, the membrane is prone to outward bulging with a large amplitude. After the water production pump is started, the inside of the membrane produces negative pressure, and the membrane restores to the state of being attached to the support plate. After frequent bulging and recovery, the membrane becomes loose. The edge of the membrane and the connection between the support plate are prone to cracks. Moreover, individual cracks are prone to small holes. Once the membrane has cracks and holes, part of the sewage will enter the cavity inside the membrane assembly through the cracks and holes, which will cause the water quality to decrease. SUMMARY

[0009] The utility model discloses a dot matrix type flat plate membrane assembly, which can not cause the membrane to swell outwardly in a large range, and the edge of the membrane is not easy to crack, and the water quality is stable. The technical scheme for solving the above problems is as follows: a dot matrix type flat plate membrane assembly, which comprises a dot matrix type vertical hard flat plate membrane assembly, a dot matrix type single-piece soft flat plate membrane assembly and a dot matrix type multi-piece integrated soft flat plate membrane assembly. The structure of the dot matrix type vertical hard flat plate membrane assembly comprises a membrane, a support plate and a mesh. The support plate is arranged in the middle and has a thickness of 5-10 mm. The support plate is provided with longitudinal and transverse grooves with a depth of 1 mm and a width of 2 mm at intervals of 5-10 mm on both sides. The mesh is arranged on both sides of the support plate. The membrane is arranged outside the mesh. The membrane and the mesh are connected to the support plate by welding or bonding. At least one water outlet is arranged on the top of the membrane assembly or the side of the support plate and is in communication with the cavity on the inner side of the membrane. A welding point or a bonding point is arranged at intervals of 20-80 mm in the middle of the membrane. The middle of the membrane and the middle of the mesh are connected to the support plate through the welding point or the bonding point. The welding point or the bonding point has a shape of a circle with a diameter of 1-10 mm, a long strip with a width of 1-10 mm and a length of 20-100 mm, and forms an array arrangement in horizontal and vertical rows or an array arrangement in staggered rows and columns. The dot matrix type single-piece soft flat plate membrane assembly is composed of a mesh and a membrane. One mesh is arranged in the middle. Two membranes are arranged on both sides of the mesh. The four sides of the two membranes are connected together. Alternatively, the dot matrix type single-piece soft flat plate membrane assembly is composed of a support plate, a mesh and a membrane. A support plate with a thickness of 0.5-1.5 mm is arranged in the middle. The mesh has two pieces and is arranged on both sides of the support plate. The membrane has two pieces and is arranged outside the mesh. The four sides of the membrane are welded or bonded to the support plate. At least one water outlet is arranged on the membrane. A welding point or a bonding point is arranged at intervals of 20-80 mm in the middle of the membrane. The middle of the membrane and the middle of the mesh are connected to the support plate through the welding point or the bonding point. The welding point or the bonding point has a shape of a circle with a diameter of 1-10 mm, a long strip with a width of 1-10 mm and a length of 20-100 mm, and forms an array arrangement in horizontal and vertical rows or an array arrangement in staggered rows and columns. The dot matrix type multi-piece integrated soft flat plate membrane assembly is composed of a membrane unit and a water collecting cavity. The membrane unit has at least two pieces, and the water collecting cavity has one or two pieces and is arranged vertically at one end or both ends of the membrane unit. The membrane unit comprises a support plate, a mesh and a membrane. A support plate with a thickness of 0.5-1.5mm support plate, the mesh is two pieces, respectively arranged on both sides of the support plate, the membrane is two pieces, respectively arranged on the outside of the mesh, the membrane is connected with the water collecting cavity through pouring on the side close to the water collecting cavity, the other side is connected with the support plate through welding or bonding, the cavity inside the membrane unit communicates with the cavity inside the water collecting cavity, the water outlet is arranged at the top of the water collecting cavity, a welding point or a bonding point is arranged every 20mm to 80mm in the middle of the membrane, the middle area of the membrane and the middle area of the mesh are connected with the support plate through the welding point or the bonding point, the shape of the welding point or the bonding point is a circle with a diameter of 1mm to 10mm or a long strip with a width of 1mm to 10mm and a length of 20mm to 100mm, and the points are arranged in an array in horizontal and vertical rows or in an array in staggered rows and columns.

[0010] Its beneficial effects are:

[0011] The dot matrix type flat membrane assembly of the utility model, since a welding point or a bonding point is arranged every 5mm to 100mm on the membrane and connected with the support plate, the membrane will not swell outward as a whole when the equipment is in a non-negative pressure suction state, because the swelling range of the membrane is small, the probability of cracks and holes appearing on the edge of the membrane is reduced, and therefore the probability of stable water quality can be greatly improved. BRIEF DESCRIPTION OF DRAWINGS

[0012] The dot matrix type flat membrane assembly of the utility model is further described in combination with the drawings and embodiments.

[0013] Figure 1 It is the front view of the dot matrix type vertical hard flat membrane assembly in the dot matrix type flat membrane assembly of the utility model, the welding points in the drawing are circular, and the points are arranged in an array in horizontal and vertical rows.

[0014] Figure 2 It is the front view of the dot matrix type single-piece soft flat membrane assembly in the dot matrix type flat membrane assembly of the utility model, the welding points in the drawing are long strips, and the points are arranged in an array in staggered rows and columns.

[0015] Figure 3 It is the front view of the dot matrix type multi-piece integrated soft flat membrane assembly in the dot matrix type flat membrane assembly of the utility model.

[0016] Figure 4 It is the schematic diagram of the running state of the dot matrix type flat membrane assembly of the utility model, and the membrane assembly in the drawing is a dot matrix type vertical hard flat membrane assembly.

[0017] Figure 5 It is the front view of the vertical hard flat membrane assembly of the prior art, and the membrane on the front is removed in the lower part of the drawing.

[0018] Figure 6 is a schematic view of the front side of a prior art single-plate soft flat sheet membrane module.

[0019] Figure 7 is a schematic view of the side of a prior art four-plate single-plate soft flat sheet membrane module in parallel string on a center hole pipe.

[0020] Figure 8 is a schematic view of the front side of a prior art multi-plate integrated flat sheet membrane module.

[0021] Figure 9 is a schematic view of the running state of a prior art flat sheet membrane module, the membrane module in the figure is a vertical hard flat sheet membrane module.

[0022] In the figure, 1 is a membrane frame, 2 is a mesh, 3 is a support plate, 4 is a membrane sheet, 5 is an upper horizontal pipe, 6 is a lower horizontal pipe, 7 is a vertical pipe, 8 is an aeration pipe, 9 is a center hole pipe, 10 is a top plate, 11 is a water collecting cavity, 12 is a welding point, 13 is a water production pump, 14 is a water outlet, 15 is an aeration fan, 16 is a sewage pool, 17 is a clean water pool, 18 is a water production pipe, 19 is a water collecting pipe, 20 is a clean water pipe, 21 is a hose, 22 is a nut, 23 is a vertical hard flat sheet membrane module, 24 is a dot matrix vertical hard flat sheet membrane module, 25 is a compression short pipe, and 26 is a single-plate soft flat sheet membrane module. DETAILED DESCRIPTION

[0023] A dot matrix flat sheet membrane module, such as Figure 1 , Figure 2 , Figure 3The physical form includes dot matrix vertical hard flat membrane assembly, dot matrix single piece soft flat membrane assembly and dot matrix multi-piece integrated soft flat membrane assembly. The structure of the dot matrix vertical hard flat membrane assembly includes membrane, support plate and mesh. The support plate is arranged in the middle and has a thickness of 5-10 mm. The support plate is provided with longitudinal and transverse grooves with a depth of 1 mm and a width of 2 mm at a distance of 5-10 mm on both sides. The mesh is arranged on both sides of the support plate. The membrane is arranged outside the mesh. The membrane and mesh are connected to the support plate by welding or bonding. At least one water outlet is arranged on the top of the membrane assembly or the side of the support plate, which is in communication with the cavity inside the membrane. A welding point or bonding point is arranged every 20-80 mm in the middle area of the membrane. The middle area of the membrane and the middle area of the mesh are connected to the support plate through the welding point or bonding point. The welding point or bonding point has a circular shape with a diameter of 1-10 mm or a long strip shape with a width of 1-10 mm and a length of 20-100 mm. The points are arranged in horizontal and vertical rows and columns in an array or in staggered rows and columns in an array. The dot matrix single piece soft flat membrane assembly is composed of mesh and membrane. A piece of mesh is arranged in the middle. Two pieces of membrane are arranged on both sides of the mesh. The four corners of the two pieces of membrane are connected together. The dot matrix single piece soft flat membrane assembly is composed of support plate, mesh and membrane. A support plate with a thickness of 0.5-1.5 mm is arranged in the middle. Two pieces of mesh are arranged on both sides of the support plate. Two pieces of membrane are arranged outside the mesh. The four corners are welded or bonded to the support plate. At least one water outlet is arranged on the membrane. A welding point or bonding point is arranged every 20-80 mm in the middle area of the membrane. The middle area of the membrane and the middle area of the mesh are connected to the support plate through the welding point or bonding point. The welding point or bonding point has a circular shape with a diameter of 1-10 mm or a long strip shape with a width of 1-10 mm and a length of 20-100 mm. The points are arranged in horizontal and vertical rows and columns in an array or in staggered rows and columns in an array. The dot matrix multi-piece integrated soft flat membrane assembly is composed of membrane unit and water collecting cavity. There are at least two membrane units and one or two water collecting cavities arranged vertically at one end or both ends of the membrane unit. The membrane unit includes support plate, mesh and membrane. A support plate with a thickness of 0.5-1.The system consists of a 5mm support plate, two mesh panels on each side, and two diaphragms on the outer sides of the mesh panels. The diaphragms are connected to the water collection chamber via casting on the side closest to it, and to the support plate via welding or bonding on the other sides. The inner cavity of the diaphragm unit communicates with the inner cavity of the water collection chamber. The outlet is located at the top of the water collection chamber. A welding or bonding point is placed every 20mm to 80mm along the middle of the diaphragm. The middle areas of the diaphragm and the mesh panels are connected to the support plate via these welding or bonding points. These points are circular (1mm to 10mm in diameter) or elongated (1mm to 10mm wide, 20mm to 100mm long), forming horizontal and vertical row-and-column aligned arrays or alternating row-and-column aligned arrays.

[0024] The principle and operation of this utility model's dot matrix flat sheet membrane module are explained in detail below with reference to the accompanying drawings:

[0025] Taking a dot-matrix vertically mounted rigid flat sheet membrane module as an example, such as Figure 4 As shown: The membrane frame is placed inside the sewage tank, the aeration pipe is placed below the lower horizontal pipe and connected to the aeration blower through a pipe, the vertical groove plate is placed between the upper and lower horizontal pipes, and the dot matrix vertical rigid flat sheet membrane module of this utility model is vertically installed in the groove of the vertical groove plate of the membrane frame. The outlet of the membrane module is connected to the water collection pipe through a hose, the permeate pump is placed at the top of the sewage tank, one end of the permeate pipe is connected to the inlet of the permeate pump and the other end is connected to the water collection pipe, one end of the clear water pipe is connected to the outlet of the permeate pump and the other end is connected to the clear water tank. During water production, the water level in the wastewater tank must be higher than the top of the membrane module. First, the aeration blower is started, and air bubbles flow out through the through holes of the aeration pipe. As they rise, they come into contact with the membrane surface and carry away the pollutants on the membrane surface. Then, the permeate pump is started. Through the negative pressure suction of the permeate pump, the pollutants in the wastewater are separated from the clean water at the membrane. The pollutants are trapped on the outside of the membrane, and the clean water enters the inside of the membrane. Then, it flows from the outlet of the membrane module into the collection pipe, the permeate pump, and the clean water pipe, and finally into the clean water tank.

[0026] The flat sheet membrane assembly generally adopts intermittent operation, that is, starting water production pump negative pressure suction for 8 minutes, stopping water production pump for 2 minutes, and the aeration fan is always running. In the time when the water production pump stops running, due to the position of the water production pump and the water production pipe being higher than the membrane assembly, under the action of atmospheric pressure, the water of the membrane assembly inside falls under water, the pressure of the water of the membrane assembly inside is greater than the pressure of the membrane assembly outside, thus a tension from the membrane assembly inside to the membrane assembly outside is generated, which will make the membrane sheet swell outward. Since the welding points or the bonding points are arranged on the membrane sheet every 20-80 mm to connect with the support plate, the force of the membrane sheet swelling outward in the non-negative pressure suction state of the membrane assembly will be constrained by the welding points or the bonding points, so that the membrane sheet will not swell outward as a whole. Since the swelling range of the membrane sheet is small, the membrane sheet will not appear relaxation phenomenon, and the probability of cracks and holes appearing at the edge of the membrane sheet will be reduced, thus the probability of stable water quality can be greatly improved.

[0027] The above only describes the preferred embodiments of the present application, and it should be noted that those skilled in the art can make several improvements and refinements without departing from the technical principles of the present application, and these improvements and refinements should also be considered as the protection scope of the present application.

Claims

1. A dot-matrix flat membrane module, which is an improvement of a flat membrane module, mainly composed of a support plate, a mesh and a membrane, characterized in that: Its physical form includes dot matrix vertical hard flat membrane assembly, dot matrix single piece soft flat membrane assembly and dot matrix multi-piece integrated soft flat membrane assembly. The structure of the dot matrix vertical hard flat membrane assembly includes a membrane, a support plate and a mesh. The support plate is arranged in the middle and has a thickness of 5-10 mm. The support plate is provided with longitudinal and transverse grooves with a depth of 1 mm and a width of 2 mm at a distance of 5-10 mm on both sides. The mesh is arranged on both sides of the support plate, and the membrane is arranged outside the mesh. The membrane and the mesh are connected to the support plate by welding or bonding around the four sides. At least one water outlet is arranged on the top of the membrane assembly or the side of the support plate, which is in communication with the cavity inside the membrane. A welding point or a bonding point is arranged every 20-80 mm in the middle area of the membrane. The middle area of the membrane and the middle area of the mesh are connected to the support plate through the welding point or the bonding point. The shape of the welding point or the bonding point is a circle with a diameter of 1-10 mm or a long strip with a width of 1-10 mm and a length of 20-100 mm. The points are arranged in an array in horizontal and vertical rows or in an array in staggered rows and columns. The dot matrix single piece soft flat membrane assembly is composed of a mesh and a membrane. A piece of mesh is arranged in the middle, and two pieces of membrane are arranged on both sides of the mesh. The four sides of the two pieces of membrane are connected together. Or it is composed of a support plate, a mesh and a membrane. A support plate with a thickness of 0.5-1.5 mm is arranged in the middle. The mesh is two pieces, which are arranged on both sides of the support plate. The membrane is two pieces, which are arranged outside the mesh and welded or bonded to the support plate around the four sides. At least one water outlet is arranged on the membrane of the dot matrix single piece soft flat membrane assembly. A welding point or a bonding point is arranged every 20-80 mm in the middle area of the membrane. The middle area of the membrane and the middle area of the mesh are connected to the support plate through the welding point or the bonding point. The shape of the welding point or the bonding point is a circle with a diameter of 1-10 mm or a long strip with a width of 1-10 mm and a length of 20-100 mm. The points are arranged in an array in horizontal and vertical rows or in an array in staggered rows and columns. The dot matrix multi-piece integrated film flat membrane assembly is composed of membrane piece units and water collecting cavities. The membrane piece units are at least two, and the water collecting cavities are one or two, which are vertically arranged at one end or both ends of the membrane piece units. The membrane piece unit includes a support plate, a mesh and a membrane piece. The support plate with a thickness of 0.5-1.5 mm is arranged in the middle. The mesh is two, which are arranged on both sides of the support plate. The membrane piece is two, which are arranged on the outside of the mesh. The side close to the water collecting cavity of the membrane piece is connected with the water collecting cavity by pouring, and the other side is connected with the support plate by welding or bonding. The cavity inside the membrane piece unit is communicated with the cavity inside the water collecting cavity. The water outlet is arranged at the top of the water collecting cavity. A welding point or a bonding point is arranged every 20-80 mm in the middle of the membrane piece. The middle area of the membrane piece and the middle area of the mesh are connected with the support plate through the welding point or the bonding point. The shape of the welding point or the bonding point is a circle with a diameter of 1-10 mm or a long strip with a width of 1-10 mm and a length of 20-100 mm. The dots are arranged in an array in horizontal and vertical alignment or in an array in staggered rows and columns alignment.

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