Cleaning and maintenance of reverse osmosis system during low temperature operation

Analysis of source water effect

The total dissolved solids content/TDS of low temperature water is about 3 to 4 times that of room temperature water. And the indicators of sulfate radical, calcium hardness, and magnesium hardness of low temperature water are higher than that of room temperature water. In the process of long-term use of low temperature water, the situation of scaling and fouling will be more serious.

Cleaning methods of reverse osmosis system

1) The Use and match of Cleaning agent

Acidic cleaning agent: On the basis of continuing to use the original acidic cleaning agent, use analytical pure hydrochloric acid instead of industrial hydrochloric acid, and control the pH of the acidic cleaning solution to about 2.0, and increase the temperature of the cleaning solution to speed up the cleaning agent reaction and cleaning efficiency .

Alkaline cleaning agent: On the basis of continuing to use the original alkaline cleaning agent, use analytical pure sodium hydroxide instead of industrial caustic soda, and control the pH of the alkaline cleaning solution at about 12.0, and speed up the cleaning agent by increasing the temperature of the cleaning solution The efficiency of reaction and cleaning.

In addition, in view of possible organic matter and microbial fouling, after each routine chemical cleaning, non-oxidizing fungicides also shall be used to disinfect and sterilize the system to ensure that the surface of the membrane elements will not appear microbial adhesion phenomenon in the early stages of operation. Ensure long-term stable operation of the reverse osmosis system and increase the operating life of the system.

2) Perfect the cleaning steps

Regarding the changes in the fouling components of the membrane elements after the water source of the reverse osmosis system is changed, the plan is changed to pickling first to fully clean the loose fouling components on the top of the fouling layer on the membrane surface. And further reduce the mechanical strength of the fouling layer on the membrane surface through osmotic dissolution.

Then, through the second stage of alkaline washing, the organic components and microorganisms wrapped in the dense scale layer on the membrane surface are thoroughly cleaned and removed;

After that, through the third stage of pickling, the method of high flow circulation and low flow soaking is adopted to appropriately extend the cleaning time to promote the full looseness of the dense and scaled layer on the membrane surface, and try to do as much as possible without causing significant damage to the membrane element desalination layer. Restore the flux level and operating pressure of the membrane element.

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