Novel disc tube type reverse osmosis membrane element and production method thereof

Abstract

The invention discloses a novel disc tube type reverse osmosis membrane element and a production method thereof, and relates to the technical field of disc tube type reverse osmosis membranes. The disc tube type reverse osmosis membrane element comprises membrane bags and flow guide discs, the multiple membrane bags and the multiple flow guide discs are arranged in a spaced and stacked mode, and the membrane bags and the flow guide discs are each provided with a center hole; each membrane bag is composed of two DTRO membranes, the outer peripheries of the two DTRO membranes are welded and sealed in an involution mode, the inner periphery corresponding to the center holes is open, protruding points are arranged on the outer surfaces of the two DTRO membranes of each membrane bag respectively, the DTRO membranes make contact with the flow guide discs through the protruding points, and the protruding points enable the membrane bags to be supported on the flow guide discs and plays a blocking and guiding role for fluid flowing between the membrane bags and the flow guide discs. According to the invention, the protruding points are printed on the surface of the DTRO membranes which is ultrasonically welded in advance in a 3D printing manner, and the flow guide discs adopt optical discs without protruding points, so that not only are the protruding points on the original flow guide discs prevented from easily puncturing the DTRO membranes, but also turbulence is improved favorably, and the filtering efficiency of the membranes is improved favorably.

Description

technical field [0001] The invention belongs to the technical field of disc-tube reverse osmosis membranes, in particular to a novel production method for disc-tube reverse osmosis membranes. Background technique [0002] In recent years, membrane technology has developed rapidly and has been widely used in fields such as electric power, metallurgy, petroleum and petrochemical, medicine, food, municipal engineering, sewage reuse, and seawater desalination. The demand for membrane technology and equipment in various projects is even higher. At present, in the field of zero discharge of leachate and concentrated brine, disc-tube reverse osmosis membrane modules have been widely used. [0003] The traditional membrane bag is formed by welding two DTRO diaphragms together by ultrasonic welding. The outer circumference of the two diaphragms is ultrasonically welded and sealed, and the inner circumference is not welded. It is similar to a bag, so it is also called a membrane bag. ...

AI Technical Summary

Problems solved by technology

[0004] The traditional disc-tube membrane module is composed of a diversion plate and a membrane bag stacked on top of each other. There are many turbulent bumps on the diversion plate. The bumps on the diversion plate can improve the guiding effect on the fluid. It can form a guiding effect on the fluid, and on the other hand, it can form a support for the filter membrane (that is, the membrane bag) in contact with the diversion plate. The sewage flows to the surface of the membrane bag through the diversion plate, and the membrane bag filters the sewage, and the clean water penetrates into the In the membrane bag, the sewage still stays outside the membrane bag, but when the operating pressure is too high and the pressure difference between the inside and outside of the membrane bag is large, the bumps are easy to puncture the DTRO diaphragm, so that the sewage will enter the membrane bag from the damaged part of the membrane bag Internally, the cleanliness of filtered water will be polluted, which will affect the quality of produced water and the effect of sewage treatment

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