Method for cleaning silicon-polluted reverse osmosis membrane

By configuring a combined cleaning method of anionic surfactants and acidic cleaning agents, the problem of incomplete cleaning of silicon scale on the reverse osmosis membrane is solved, silicon scale and other pollutants are efficiently removed, the desalination rate and water flux of the membrane are restored, and the service life of the membrane is extended.

CN120754706APending Publication Date: 2025-10-10CHINA ENERGY GRP NINGXIA COAL IND CO LTD +1
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Patent Information

Application Number
CN202510904093.9
Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
Filing Date
2025-07-01
Publication Date
2025-10-10

AI Technical Summary

Technical Problem

In the prior art, the cleaning of silicon scale on the reverse osmosis membrane is not thorough, the cleaning agent is unsafe, and the membrane pores expand after cleaning, resulting in a decrease in the desalination rate and unqualified water quality.

Method used

Cleaning agents A, B, and C, composed of anionic surfactants, triethanolamine hydrochloride, ammonium bifluoride, citric acid, and sulfosalicylic acid, are used with different pH values ​​to clean the reverse osmosis membrane in sequence, changing the structure of silica scale, removing organic matter and metal oxides, and finally shrinking the membrane pores.

Benefits of technology

The reverse osmosis membrane is efficiently cleaned, the desalination rate is restored to over 97%, the life of the membrane element is extended, the maintenance cost is reduced, and there is no damage to the membrane material.

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Abstract

The invention relates to the technical field of water treatment cleaning agents, and discloses a silicon pollution type reverse osmosis membrane cleaning method, which comprises: 1) preparing an anionic surfactant and triethanolamine hydrochloride into a cleaning agent A with a pH value of 10-11; wherein the anionic surfactant is sodium dodecyl benzene sulfonate and / or lauryl sodium sulfate; 2) preparing a cleaning agent B with the pH value of 2-4 from ammonium bifluoride, citric acid, sulfosalicylic acid and an organic nitrogen-containing compound; (3) hydrochloric acid and / or citric acid are / is prepared into a cleaning agent C with the pH being 2-3; and 4) sequentially cleaning the reverse osmosis membrane by using the cleaning agent A, the cleaning agent B and the cleaning agent C. The medicament involved in the method is mild in performance and good in safety, the silicon scale can be thoroughly removed, the desalinization rate and the water flux of the cleaned reverse osmosis membrane element are well recovered, and the requirements of production and reuse are met.
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