Reverse osmosis desalinization system capable of on-line back washing

Abstract

The present invention discloses a reverse osmosis desalination equipment capable of implementing on-line back-purge. It includes high-pressure pump, reverse osmosis membrane component whose concentrated water side is connected with water outlet end of high-pressure pump, water-producing pipe and water-producing valve which are connected with water-producing side of the described reverse osmosis membrane component. Besides, said equipment also includes raw water-supplying valve and back-purge water cylinder with piston. Said invention also provides the connection mode of all the above-mentioned components.

Description

technical field [0001] The invention relates to a reverse osmosis system, in particular to an online reverse osmosis desalination system. Background technique [0002] The reverse osmosis desalination system has been widely used in the water treatment industry. Its principle is: under the action of external pressure, some components in the aqueous solution are selectively passed through a special material and processing method, which has Semi-permeable membrane (reverse osmosis membrane), so as to achieve the purpose of desalination, purification or concentration separation. [0003] At present, industrial reverse osmosis membranes are mainly asymmetric membranes. That is, the reverse osmosis membrane consists of a thin dense surface (active layer) and a porous support layer below it. The active layer is truly selective to the mass transfer process and basically determines the separation performance of the membrane. On the contrary, the support layer only acts as a carrie...

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Problems solved by technology

[0030] Although backflushing can make the membrane clean effectively, the conventional backflushing method cannot be applied to reverse osmosis membranes.

Reverse osmosis is an asymmetric structure and cannot withstand the back pressure formed by the conventional recoil process on the membrane

[0031] The current reverse osmosis membrane group, because the backwash of the reverse osmosis membrane cannot be realized, makes the existing reverse osmosis system have higher requirements on the water quality entering the reverse osmosis membrane system

For the water treatment system, the water quality varies greatly from region to region, but no matter what kind of pretreatment is used, it is difficult to ensure that the reverse osmosis membrane will not be blocked by fouling, such as organic matter or scaling. Since the dirt on the membrane surface cannot be removed in time, the existing The reverse osmosis membrane system generally needs to run for about 3 months, and it has to be shut down and cleaned with drugs

This not only increases the operating cost of the reverse osmosis system, but also inevitably affects the environment due to the discharge of cleaning chemicals

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