针对超滤分离技术净化受污染地表水源水、城市污水二级处理水过程透水量不可逆衰减问题，围绕超滤技术要求研究受污染地表水源水、典型城市污水二级处理水中溶解性有机物类别含量、分子量分布、亲疏水性、zeta电位等性质。用PVDF、PES、PSF、PMMA等制备AFM聚合物膜材料探针及代表性污染物探针，研究不同材质超滤膜在不同水质条件下膜/污染物、污染物/污染物间微观作用力的变化；通过水质特征、通量衰减、不同材质超滤膜在不同运行阶段与水力冲洗前后微观作用力变化，得到地表水及城市污水二级处理水对超滤膜污染原因物质特性与影响因素的关系。从膜/污染物及污染物/污染物间微观作用力变化分析膜污染机理，提出膜可逆与不可逆污染的微观作用力基准范围的确定方法及膜污染行为微观作用力评价方法。对膜材料与预处理技术选择、通量恢复方式及调控策略提供指导，为超滤膜在地表水、城市污水深度净化提供理论与技术的支持。

In order to solve the UF membrane flux irreversible attenuation in advanced treatment surface water and City sewage secondary effluent, different AFM probes will be prepared and employed to investigate the variation of micro force to reveal the membrane fouling mechanism. Firstly, different membrane materials (PVDF, PES, PSF, PMMA) and representative pollutants probes will be prepared. Based on which, the membrane-foulant and foulant-foulant micro force will be measured. The range of micro force variation will be defined and a new evaluation method will be improved to determine whether the membrane fouling is reversible or not. The membrane fouling mechanism will be revealed from micro force variations , which will be beneficial to choose the better membrane materials and recover the flux during surface water and City sewage secondary effluent treatment by UF membranes.