Abstract:

There is a need for efficient control of membrane fouling in dynamic membrane bioreactors (DMBRs), but little is known about the phenomenon of membrane fouling and the influence of polymeric membrane materials on membrane fouling in DMBRsIn this study, the influence of several polymeric membrane materials on membrane fouling in DMBRs was investigated on the basis of results of a series of experiments using artificial domestic sewageFour different polymers, polyethylene (PE) non-woven, polypropylene (PP) non-woven, PE mesh and polyamide(PA) mesh were examined and the degree of fouling in each filter was monitoredAlso, the analysis of the foulants in each membrane material was performedThe results demonstrated that nonwoven material was superior to mesh in terms of prevention of irreversible fouling in DMBRs used for treatment of domestic sewageThe four membrane materialsdegrees of fouling are in descending order:PA mesh, PE mesh, PP non-woven, PE non-wovenThe compositions of foulants causing irreversible fouling differed considerably, depending on the membrane polymeric materialsThe results suggested that extracellular polymeric substances (EPS) in organic matter on the surface of the materials had higher affinities with membrane resistance than other fractions and consequently caused greater irreversible foulingThe EPS contents in the irreversible layer had significant correlation with membrane resistanceWhile both protein and polysaccharide contents in the irreversible layer had correlation with membrane resistanceThe influence of proteins was more obvious than polysaccharides.

Key words:

动态膜生物反应器, 膜基材料, 膜污染, 膜面物质

摘要：

在动态膜生物反应器（DMBR）中，膜污染的有效控制至关重要。选用4种膜基材料：聚酯无纺布、聚丙烯无纺布、聚酯筛网、聚酰胺筛网，考察膜基材料受污染程度，分析膜面污染物成分。结果表明：应用DMBR处理模拟生活污水，4种材料易受污染的程度依次为聚酰胺筛网、聚酯筛网、聚丙烯无纺布、聚酯无纺布，筛网比无纺布更易发生不可逆污染。膜面物质不可逆污染层中的胞外聚合物含量对膜污染有重要作用，其中蛋白质、多糖均与膜污染相关，蛋白质较多糖与膜污染具有更密切关系。

关键词:

动态膜生物反应器, 膜基材料, 膜污染, 膜面物质