Poorasgari Eskandar, König Katja, Fojan Peter, Keiding Kristian, Christensen Morten Lykkegaard
Department of Biotechnology, Chemistry, and Environmental Engineering, Aalborg University, Sohngaardsholmsvej 57, DK-9000 Aalborg, Denmark.
Department of Physics and Nanotechnology, Aalborg University, Skjernvej 4, DK-9220 Aalborg, Denmark.
Chemosphere. 2014 Dec;117:144-50. doi: 10.1016/j.chemosphere.2014.06.006. Epub 2014 Jul 9.
Fouling by free extracellular polymeric substances was studied in an enhanced biological phosphorus removal-membrane bioreactor. It was demonstrated that the free extracellular polymeric substances, primarily consisting of humic-like substances, were adsorbed to the membrane used in the enhanced biological phosphorus removal-membrane bioreactor plant. Infrared analyses indicated the presence of the humic-like substances on the membrane's active surface after filtration of the free extracellular polymeric substances suspension. Scanning electron microscopy showed the presence of a gel layer on the membrane surface after filtration of the free extracellular polymeric substances suspension. The gel layer caused a significant decline in water flux. This layer was not entirely removed by a backwashing, and the membrane's water flux could not be re-established. The membrane used in the enhanced biological phosphorus removal-membrane bioreactor plant showed infrared spectra similar to that fouled by the free extracellular polymeric substances suspension in the laboratory. Thus, the results of this study show the importance of humic-like substances in irreversible fouling of enhanced biological phosphorus removal-membrane bioreactor systems.
在强化生物除磷膜生物反应器中研究了游离细胞外聚合物造成的膜污染。结果表明，主要由类腐殖质组成的游离细胞外聚合物被吸附到强化生物除磷膜生物反应器装置中使用的膜上。红外分析表明，在过滤游离细胞外聚合物悬浮液后，膜的活性表面存在类腐殖质。扫描电子显微镜显示，在过滤游离细胞外聚合物悬浮液后，膜表面存在凝胶层。凝胶层导致水通量显著下降。通过反冲洗不能完全去除该层，膜的水通量无法恢复。强化生物除磷膜生物反应器装置中使用的膜的红外光谱与实验室中被游离细胞外聚合物悬浮液污染的膜相似。因此，本研究结果表明类腐殖质在强化生物除磷膜生物反应器系统不可逆污染中的重要性。
