A cleaning method for a reverse osmosis system

Abstract

The invention relates to a method for cleaning a reverse osmosis system. The method comprises a step of cleaning a reverse osmosis membrane by using reverse osmosis system cleaning liquid, wherein the cleaning liquid is cleanser-containing aqueous solution; the pH value of the cleaning liquid is controlled to be 11.0+ / -0.5; the cleanser consists of a chelating agent, an anionic surfactant and a polymer dirt dispersion agent; the chelating agent is at least one selected from polyphosphates and ethylenediamine tetraacetic acid; the anionic surfactant is at least one selected from C8-C16 alkylbenzene sulfonate and N-oleoyl-N-methyl taurine; and the polymer dirt dispersion agent is at least one selected from acrylate homopolymer and acrylate copolymer. By cleaning the reverse osmosis membrane with the method provided by the invention, the problems of colloid, organic and microbial pollution and the like which slowly occur on the reverse osmosis membrane can be intensively solved; the salinity of water produced by the reverse osmosis system can be effectively reduced; the water yield of the reverse osmosis system can be increased; and the pressure difference before and after the reverse osmosis membrane can be reduced.

Description

technical field [0001] The invention relates to a cleaning method for a reverse osmosis system, in particular to a cleaning method for a reverse osmosis membrane in the reverse osmosis system. Background technique [0002] With the global water pollution and water scarcity, the high-tech water treatment equipment—reverse osmosis desalination device (RO) has developed rapidly since the first high-performance membrane was made in the United States in the late 1950s. my country first adopted reverse osmosis desalination devices in the late 1970s, but it was not until 1993 that TFC-HR high desalination new membranes appeared that great development was achieved. Reverse osmosis is a membrane separation technology driven by pressure difference with the help of the function of selective permeable membrane. When the pressure applied to the system is greater than the osmotic pressure of the solution, water molecules pass through the membrane and enter the central tube through the wat...

AI Technical Summary

Problems solved by technology

U.S. Patent 5,499,197 discloses an automatic control scheme for a reverse osmosis system. This reverse osmosis system is used to produce drinking water. Various indicators of the produced water are monitored through the automatic control system. When the monitored indicators of the produced water are unqualified, the Automatically send out an alarm to indicate that the reverse osmosis system needs to be cleaned, and can automatically stop the operation of the reverse osmosis system if it is not cleaned effectively, but does not mention the specific cleaning plan

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