Supporting plate for flat membrane elements as well as flat membrane elements and flat membrane components

Abstract

The invention relates to flat membrane elements and components for water treatment, which are characterized in that the front face and the back face of a supporting plate of membrane elements are respectively provided with a plurality of scattered face bosses higher than the supporting plate. The adjacent membrane elements are combined and are supported at intervals by means of the face bosses of the supporting plate. The supporting plate can not be tilted and deformed, the condition that the distance of each point between the planes of the adjacent membrane elements is unchanged is ensured, aerated scouring is uniform, and the membrane pollution is lowered. Moreover, the thickness of the supporting plate can also be obviously reduced, and the thickness is reduced from original 5.5 to 6.0mm to about 3.5mm, so that the weight and the cost of the supporting plate are lowered by about 30 percent, the bosses are arranged at intervals, the adjacent intervals of assembled membrane components can also be changed according to actual requirements, and the condition that the distance of the membrane elements can be regulated is realized. Furthermore, the method of assembling the components of the membrane elements is also changed, the function of side inserting assembly can be realized, the structure of a membrane bracket is simplified, and the versatility of a component frame is enhanced. The front face and the back face of the supporting plate are additionally provided with transverse flow passages with transverse penetration, so that the resistance of water collection and flow deflection is small, the transmembrane pressure difference of a system is small, the water output of gravitational pressure difference can be adopted for filtering, and the running energy consumption of the system can be greatly lowered.

Description

technical field [0001] The present invention is an improvement of the membrane supporting plate in the flat membrane element used for water treatment, especially relates to a flat membrane with thin thickness and not easily deformed, and the distance between the membrane elements can be adjusted arbitrarily according to needs; and a flat membrane with small filtration running resistance and transmembrane pressure difference Support plate for components. It also relates to a flat membrane element and a flat membrane module constituted by the support plate. Background technique [0002] Membrane-bioreactor (Membrane Bioreactor, MBR), as a new high-efficiency sewage treatment technology, has become an attractive and competitive option for urban sewage and industrial wastewater treatment and reuse, and is regarded as "the most Best Available Technology". The flat membrane element is the core element of the MBR reactor, and the support plate is an important core component of th...

AI Technical Summary

Problems solved by technology

This support plate has the following disadvantages in actual use: First, the relatively thick support plate (5.5-6.0mm) becomes the second largest factor in the cost of the membrane element, and its cost accounts for about 40-50% of the entire membrane element. It is also a reason that can not be ignored because of the high cost of membrane elements and the difficulty in promotion, but reducing the thickness of the plate will result in insufficient rigidity, which is not enough to make its vertical support maintain a plane; the second is that the large flat membrane element is positioned on the side (inserted into a U-shaped Groove) to maintain the required spacing of the components (usually 7-8mm), for such a large plane, even if such a thick plastic support plate is only positioned on both sides, deformation and warping will inevitably occur in actual use. Warpage causes the distance between two adjacent membrane elements to change at the warped part, especially if the distance becomes smaller, it will cause uneven gas-water flushing between membrane elements, resulting in mud accumulation, which in turn will cause membrane surface blockage, resulting in a decrease in water flux

But it brings other disadvantages: for example, the strength and stiffness of the same thickness of the support plate will be greatly reduced (actually thinning the plate surface to maintain the vertical thickness), and it is easier to deform and warp during use. If a thicker plate surface is used The support plate leads to an increase in cost and a decrease in the effective filtration area per unit volume; relying on convex circles to support the membrane surface will inevitably lead to a dense arrangement of convex circles, which not only increases the difficulty of mold opening and manufacturing, but is also more difficult to achieve for large-area support plates; and small The thin microporous membrane surface (usually only 0.2mm) is supported by a convex cylinder with a small area, and the contact surface between the dot circle and the membrane surface is small, which is easy to cause damage to the microporous membrane under the action of water pressure

This kind of structure and assembly method has two major deficiencies: one is the U-groove spacing setting of the frame, the spacing of the membrane elements cannot be changed, and it is difficult to adapt to different and variable sewage requirements for the best arrangement spacing. It is necessary to remake the frame for the module, and the versatility of the module frame is poor; second, the on-site assembly is inserted upward and downward, and it is very inconvenient to climb up. For membrane elements with a height of 1.8 meters or higher, vertical insertion installation is extremely inconvenient

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