NALYSIS OF REVERSE OSMOSIS MEMBRANE FOULING AND CHEMICAL CLEANING IN RECLAIMED WATER REUSE PROJECT OF A NEW MATERIAL ENTERPRISE
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Abstract
Background and Purpose: In reclaimed water reuse systems within the new material industry, reverse osmosis systems frequently suffer from performance decline due to composite fouling from plastic particles and cationic surfactants. This case study aims to restore severely fouled reverse osmosis membranes to their optimal operating condition. Methods: To address this specific composite fouling, a compound cleaning agent was developed. This agent combines dimethyl sulfoxide with an alkaline dispersant. A restorative chemical cleaning procedure was then conducted on the fouled reverse osmosis membranes using this formulation. Results: The chemical cleaning treatment achieved significant success. Following the procedure, the operating feed pressure of the reverse osmosis system decreased markedly. Concurrently, key performance indicators were effectively restored: the water production rate and the salt rejection rate both returned to their expected design levels, confirming the desired cleaning effect. Conclusion: This case demonstrates the efficacy of the dimethyl sulfoxide and alkaline dispersant compound for treating this specific composite foulant. The study offers a new technical approach for addressing reverse osmosis membrane fouling in the reclaimed water reuse systems of new material enterprises. It provides important practical guidance for ensuring the stable and efficient operation of similar industrial water treatment systems.