A kind of production method of disc type reverse osmosis membrane element

Abstract

The invention discloses a production method of a disc tube type reverse osmosis membrane element, and relates to the technical field of a disc tube type reverse osmosis membrane. The disc-tube reverse osmosis membrane element includes a membrane bag and a diversion plate, and multiple membrane bags and a plurality of diversion plates are stacked at intervals. Both the membrane bag and the diversion plate have a central hole; the membrane bag is composed of two DTRO membranes. The two DTRO diaphragms are welded and sealed on the outer periphery, and the inner periphery corresponding to the central hole is open. The two DTRO diaphragms of the membrane bag are respectively provided with bumps on their outer surfaces, and the DTRO diaphragm contacts the guide plate through the bumps. The protruding points make the membrane bag supported on the deflector plate and play the role of blocking and guiding the fluid flowing between the membrane bag and the deflector plate. The present invention prints bumps on the surface of the DTRO diaphragm that has been ultrasonically welded in advance by means of 3D printing, and the guide plate adopts a disc without bumps, which not only prevents the bumps on the original guide plate from easily piercing the DTRO membrane It also helps to improve the turbulent flow and improve the filtration efficiency of the membrane.

Description

technical field [0001] The invention belongs to the technical field of disc-tube reverse osmosis membranes, in particular to a 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. The ou...

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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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