Singapore Membrane Technology Centre, Nanyang Technological University, Singapore 639798, Singapore.
Bioresour Technol. 2011 Jul;102(13):6808-14. doi: 10.1016/j.biortech.2011.04.012. Epub 2011 Apr 12.
Microbial community developments and biomass characteristics (concentration, particle size, extracellular polymeric substances (EPS), and membrane fouling propensity) were compared when three MBRs were fed with the synthetic wastewater at different organic loadings. Results showed that the bacterial communities dynamically shifted in different ways and the EPS displayed dissimilar profiles under various organic loadings, which were associated with the ratios of food to microorganism and dissolved oxygen levels in the MBRs. The membrane fouling tendency of biomass in the low-loading MBR (0.57 g COD/L day) was insignificantly different from that in the medium-loading MBR (1.14 g COD/L day), which was apparently lower than that in the high-loading MBR (2.28 g COD/L day). The membrane fouling propensity of biomass was strongly correlated with their bound EPS contents, indicating cake layer fouling (i.e., deposition of microbial flocs) was predominant in membrane fouling at a high flux of 30 L/m(2)h.
当三种 MBR 分别以不同有机负荷处理合成废水时，比较了微生物群落的发展和生物质特性（浓度、粒径、胞外聚合物（EPS）和膜污染倾向）。结果表明，在不同有机负荷下，细菌群落以不同的方式动态转移，EPS 呈现出不同的分布，这与 MBR 中的食物与微生物的比例和溶解氧水平有关。低负荷 MBR（0.57 g COD/L·d）中生物质的膜污染倾向与中负荷 MBR（1.14 g COD/L·d）无显著差异，明显低于高负荷 MBR（2.28 g COD/L·d）。生物质的膜污染倾向与它们结合的 EPS 含量密切相关，表明在通量为 30 L/m(2)·h 时，膜污染主要是由滤饼层（即微生物絮体的沉积）引起的。
