A tubular flat sheet membrane support element

Abstract

This utility model relates to the field of membrane separation in wastewater treatment technology, specifically to a tubular flat-plate membrane support element. The support element includes hollow tubes arranged side-by-side, with adjacent hollow tubes connected by multiple connection points to form a plate-like structure; the tube walls have holes. In this utility model, multiple hollow tubes are arranged in rows and fixed together to form a plate. The hollow tubes serve as water passages, replacing the conventional flat-plate membrane element support plate, reducing production costs and simplifying the membrane manufacturing process.

Description

Technical Field

[0001] This utility model relates to the field of membrane separation in wastewater treatment technology, specifically to a tubular flat sheet membrane support element. Background Technology

[0002] Membrane bioreactors (MBRs), as a novel wastewater treatment technology that deeply integrates efficient membrane separation technology with the activated sludge process, have been widely used in my country's wastewater treatment field in recent years. With their superior separation performance, MBRs can effectively remove suspended solids and organic pollutants from wastewater, significantly improving effluent quality and meeting increasingly stringent environmental emission standards, playing a crucial role in municipal wastewater and industrial wastewater treatment.

[0003] MBR flat-sheet membrane modules are a type of membrane bioreactor, mainly composed of flat-sheet membrane units, an aeration system, and their combined housing. The flat-sheet membrane unit, as the key component directly involved in the separation process, is generally composed of membrane sheets, membrane liners, and support plates. Currently, most membrane unit support plates in my country are made of ABS sheets. However, in the actual operation of MBR flat-sheet membrane modules, support plates based on ABS sheets have revealed several problems that urgently need to be addressed: 1. Complex production costs; 2. Stringent requirements for auxiliary frames; 3. High consumption of membrane washing agents; 4. High gas-to-water ratio; 5. Low packing density.

[0004] How to effectively solve the problems of low packing density, high cost, and large reagent consumption of existing MBR flat sheet membrane support plates while giving full play to the advantages of flat sheet membranes in MBR process has become a technical problem that urgently needs to be solved in the current wastewater treatment field, and it is also the core objective of this utility model. Utility Model Content

[0005] In view of this, the purpose of the present invention is to provide a tubular flat sheet membrane support element that can reduce manufacturing costs and simplify operation and maintenance.

[0006] The technical solution adopted in this invention is as follows:

[0007] A tubular flat sheet membrane support element includes hollow tubes arranged side by side, with adjacent hollow tubes connected by connection points to form a plate-like structure; the hollow tubes have holes in their walls.

[0008] The hollow tube has a diameter of 0.1-3.0 mm and a pore size of 1.0-10.0 μm on its wall. The hollow portion inside the tube allows water to pass through, serving as a guide and collector for water flow.

[0009] The porosity of the holes in the hollow tube is 60-80%.

[0010] The connection points within the same connection space are spaced apart, with a spacing of 5-100mm between adjacent connection points.

[0011] The connection points are made by adhesive bonding, hot-melt welding, or braiding.

[0012] The adhesive bonding or hot melt welding includes, but is not limited to, spot bonding or spot welding, full bonding or full welding, symmetrical bonding or symmetrical welding, and staggered bonding or staggered welding.

[0013] The hollow tube is made of stainless steel, PET, PP, PVC, or composite materials (PP+PET+PVDF or PP+silica+PE, etc.). In actual production, economical materials with certain ductility and tensile strength are selected to reduce production costs while ensuring performance.

[0014] When braiding is used for connection, the braiding uses braided threads with a circular cross-section. The material of the braided threads is the same as that of the hollow tube.

[0015] Compared with the prior art, the beneficial technical effects of the present invention are:

[0016] 1. In this utility model, multiple hollow tubes are arranged in a row and connected and fixed into a plate. The hollow tubes serve as water passages, replacing the support plate of conventional flat sheet membrane elements, reducing production costs and simplifying the membrane manufacturing process. It retains the fouling resistance advantage of flat sheet membranes while saving production costs, increasing packing density, reducing air rinsing air volume, reducing energy consumption, reducing membrane cavity volume, and reducing the amount of washing agents used.

[0017] 2. In actual production, a suitable hollow tube diameter of 0.1-3.0mm can be selected to make the arrangement less prone to deformation during the connection process, ensuring smooth water flow and water flow area, making the production process easier to operate, ensuring the strength of the pipe, and at the same time, a smaller pipe diameter can make the diaphragm thinner, ensuring the filling density.

[0018] 3. When the adjacent hollow tubes of this utility model are connected by braiding, the material of the braiding thread is the same as that of the hollow tube. This makes the elasticity of the braided tube and the braiding thread consistent, increases the service life, facilitates procurement, simplifies the production process, and improves the user experience. The circular shape further ensures support, prevents deformation, and reduces the risk of compressing the braided tube, thus ensuring a smooth water passage. Attached Figure Description

[0019] Figure 1 This is a planar schematic diagram of the tubular flat sheet membrane support element of Embodiment 1 of this utility model;

[0020] Figure 2 This is a cross-sectional schematic diagram of the tubular flat sheet membrane support element of Embodiment 1 of this utility model;

[0021] Figure 3 This is a plan view of the support element of the tubular flat sheet membrane support element in Embodiment 2 of this utility model;

[0022] Figure 4 This is a vertical cross-sectional view of the support element of the tubular flat sheet membrane support element in Embodiment 2 of this utility model;

[0023] In the diagram, the numbers represent: 1 for hollow tube, 2 for connection point, 3 for braided thread, and 4 for the dried casting solution. Detailed Implementation

[0024] The following examples illustrate specific implementations of the present invention. However, these examples are merely for illustrative purposes and do not limit the scope of the invention in any way.

[0025] Example 1: As Figure 1 , 2 As shown, the tubular flat sheet membrane support element includes a hollow tube 1 with a diameter of 2 mm. The hollow tubes 1 are arranged side by side, and the tube wall of the hollow tube 1 is provided with holes with a diameter of 1 μm and a porosity of 70%. Adjacent hollow tubes 1 are connected as connection points 2 by symmetrical adhesive bonding to form a plate-like structure. The distance between adjacent connection points 2 in the same connection space is 10 mm, forming the tubular flat sheet membrane support element.

[0026] In use, membrane sheets are welded above and below the tubular flat-sheet membrane support element to obtain a tubular flat-sheet membrane sheet with a thickness of approximately 2.3 mm. Four to five membrane sheets are then combined and connected to a water collection pipe to form a single membrane element. During operation, water is filtered through the membrane sheet, enters the hollow tube 1 through the holes, and then flows into the water collection pipe for the next process. The packing density of the assembled membrane element can reach up to 550 m² / m³, more than six times that of conventional flat-sheet membranes, and the gas-to-water ratio is reduced to approximately 7:1, resulting in lower energy consumption. Finally, the membrane cavity volume of this membrane element structure is significantly reduced compared to conventional flat-sheet membranes, greatly reducing membrane washing costs.

[0027] Example 2: Figure 3 , 4 As shown, the tubular flat sheet membrane support element includes hollow tubes 1 with a diameter of 2 mm, arranged side by side, with holes on the tube wall of the hollow tubes 1, the pore diameter being 1 μm and the porosity being 80%;

[0028] Adjacent hollow tubes 1 are woven together by braided threads (circular cross-section, diameter 1.5mm). The spacing between adjacent braided points in the same connection space is 20mm, forming a tubular flat sheet membrane support element.

[0029] Casting solution is applied to the upper and lower surfaces of the obtained tubular flat-sheet membrane support element. After the casting solution dries, a sheet of dried casting solution 4 with a thickness of approximately 3.5 mm is formed on the upper and lower surfaces of the tubular flat-sheet membrane support element. This sheet can be used as a membrane without the need for a membrane sheet. Similarly, 4-5 membrane sheets are combined together and integrated into a whole through a water collection pipe to form a membrane element. During operation, water is filtered through the dried casting solution and then enters the hollow tube 1 through the holes, before flowing into the water collection pipe for the next process. The packing density of the assembled membrane element can reach up to 420 m² / m³, which is about 4.6 times higher than that of conventional flat-sheet membranes. The air-to-water ratio is also reduced to about 8:1, resulting in lower energy consumption. The membrane cavity volume of this membrane element structure is significantly reduced compared to conventional flat-sheet membranes. For large-scale wastewater treatment plants, the consumption of membrane washing agents is almost zero, greatly reducing membrane washing costs.

[0030] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention and are not intended to limit it. Any other modifications or equivalent substitutions made by those skilled in the art to the technical solutions of the present invention, as long as they do not depart from the spirit and scope of the technical solutions of the present invention, should be covered within the scope of the claims of the present invention.

Claims

1. A shell and plate membrane support element, characterized in that: It includes hollow tubes, which are arranged side by side and connected to each other through connection points to form a plate-like structure; the hollow tubes have holes in their walls.

2. The tubular plate and frame membrane support element of claim 1, wherein: The hollow tube has a diameter of 0.1-3.0 mm and a pore size of 1.0-10.0 μm on its wall.

3. The tubular flat sheet membrane support element according to claim 1 or 2, characterized in that: The porosity of the holes in the hollow tube is 60-80%.

4. The tubular plate and frame membrane support element of claim 1 or 2, characterized in that: Connection points within the same connection space are spaced apart, with a spacing of 5-100mm between adjacent connection points.

5. The tubular plate and frame membrane support element of claim 1 or 2, wherein: The connection points are made by adhesive bonding, hot-melt welding, or braiding.

6. The tubular plate and frame membrane support element of claim 5, wherein: The weaving process uses braided yarn with a circular cross-section.

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