中文摘要：

采用经过聚合多巴胺和氨基聚乙二醇（mPEG-NH2）表面改性的PVDF微滤膜,通过浸没在膜生物反应器（MBR）中验证改性微滤膜的抗污染性能.同时,采用多种分析手段对改性膜进行表征,包括膜表面微观形貌、润湿性、粗糙度和表面官能团等.实验同时考察了改性膜在MBR中运行的水通量衰减、污染膜的阻力分布,以及对膜面污染物的胞外多聚物组分的影响.结果发现,所采用的膜改性方法明显改善了膜表面的亲水性.短期过滤实验结果表明,多巴胺涂覆膜的稳定通量比原膜高47%,PEG改性膜则在水通量方面有进一步提高;在长期恒通量过滤阶段,多巴胺涂覆膜和PEG接枝膜的比膜通量分别比原膜高37%和88%.实验还发现,改性膜表面滤饼层中蛋白质和多糖含量均低于原膜.

英文摘要：

PVDF microfiltration（ MF） membranes were modified via coating polydopamine（ PD） and methoxy polyethylene glycolsamine（ mPEG-NH2）.The antifouling performance of modified membranes was assessed in a membrane bioreactor（ MBR）. The modified membranes were subjected to different characterizations including morphology,wettability,surface roughness and chemical group analysis. The performance of modified membranes was examined in terms of water flux in MBR,resistance distribution of fouled membranes and the composition of extracellular polymeric substance（ EPS） in the foulants of membrane surface. The membrane modifications used in in this study improved the hydrophilicity significantly. It was found that the water flux of PDcoating membrane was 47% higher than that of the pristine membrane in steady-state during a short term filtration. The PEG-grafting membranes showed a further improvement in permeability. During a long-term filtration,the special flux of PD-coating and PEG-grafting membranes increased by 37% and88%,respectively,comparing to the pristine membrane. The result indicated that both protein and polysaccharide content in the cake layer on the modified membranes were lower than that on pristine membrane.