低压膜处理污水过程中膜污染缓解效果研究

王 利颖
中交机电工程局有限公司

摘要

超滤膜膜污染问题是限制其应用的重要问题。膜自身性质是影响超滤膜污染的重要因素。膜的孔径小于污
染物粒径时，污染物会沉积在膜表面并形成滤饼层，几乎无膜堵塞问题；相对而言，疏水膜比亲水膜更容易污染。
致堵物质对膜污染有重要影响：致堵物质分子量越大，膜饼层污染越严重。膜工艺运行条件对膜污染的影响包括：
运行过程中膜通量越大，膜越快污染。物理和化学联用清洗能有效缓解膜污染。
　　根据致堵污染物性质和处理水质有针对性选用的混凝、吸附、预氧化及膜改性技术单独使用均能控制膜污染。

关键词

超滤膜；膜污染；预处理；膜改性

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