Method for flushing reverse osmosis membrane

Abstract

The invention provides a method for flushing a reverse osmosis (RS) membrane, which aims at the problems of filtration surface contamination and first-section contamination of a reverse osmosis system membrane caused by high salt, organic colloidal silica, high molecular organic contaminants and microbiological remains during reverse osmosis treatment of olefin production process water, circulating cooling water and sewerage. In the method, positive flushing and concentrated water side reverse flushing are adopted, and agents such as an organic solvent and the like are matched, so hydraulic flushing is formed on the RO membrane filtration surface, blocking contaminants on the membrane surface which cannot be chemically removed are obviously removed, the problem of the first-section contamination of a membrane system is solved, and stable running period of the RO system is prolonged.

Description

technical field [0001] The invention relates to a method for flushing reverse osmosis membranes, in particular to a method for surface pollution of reverse osmosis membranes caused by inorganic salts, organic silica colloids, high molecular organic pollutants, and bacteria and algae residues in the advanced treatment and reuse of sewage in petrochemical enterprises. rinse method. Background technique [0002] At present, the reverse osmosis process (referred to as RO) is one of the main methods for the advanced treatment and reuse of sewage. Due to the characteristics of petrochemical wastewater, especially the process water of chemical olefin production equipment and the sewage of circulating cooling water, the water quality is poor, the water quality is complex, the content of colloids and cations, bacteria and algae is high, and it is easy to cause fouling to the reverse osmosis system. [0003] At present, conventional chemical cleaning is usually adopted for fouling of...

AI Technical Summary

Problems solved by technology

[0005] Aiming at the problem that the reverse osmosis system is fouled and clogged when the process water and circulating cooling water effluent of petrochemical enterprises are subjected to membrane advanced treatment, it is difficult to achieve a satisfactory cleaning effect by using conventional chemical cleaning methods. The present invention provides a An effective flushing method for the reverse osmosis system, which solves the membrane filtration surface and the first-stage pollution of the reverse osmosis system caused by organic silica colloids, high molecular organic pollutants, and bacteria and algae residues, so as to prolong the stable operation period of the reverse osmosis system and eliminate chemical cleaning Purpose of hard-to-remove pollutants

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