State Key Laboratory of Pollution Control and Resource Reuse, School of the Environment, Nanjing University, Nanjing 210023, PR China.
State Key Laboratory of Pollution Control and Resource Reuse, School of the Environment, Nanjing University, Nanjing 210023, PR China.
Bioresour Technol. 2015 Dec;197:99-105. doi: 10.1016/j.biortech.2015.08.049. Epub 2015 Aug 22.
Three lab-scale membrane bioreactors (MBRs) were continuously operated to treat saline wastewater under 0%, 0.75% and 1.5% NaCl stress. 0.75% and 1.5% NaCl reduced the COD and NH4(+)-N removal at the beginning, while the removal efficiencies could be recovered along with the operation of MBRs. Also, the polysaccharide in extracellular polymeric substances (EPS) and soluble microbial products (SMP) played an important role in the membrane fouling. Illumina sequencing of 16S rRNA gene showed that the increasing level of salinity reduced the diversity of the microbial community, and a higher salinity stimulated the growth of Bacteroidetes. At genus level, Flavobacterium, Aequorivita, Gelidibacter, Microbacterium, and Algoriphagus increased with the increase of salinity, which are shown to be highly salt tolerant. The strength of salinity or the duration of salinity could stimulate the microorganisms with similar functions, and the changes of polysaccharide in EPS and SMP were closely related to the membrane fouling rate as well as correlated with some saline-resistance genera.
三个实验室规模的膜生物反应器（MBR）连续运行，在 0%、0.75%和 1.5%NaCl 胁迫下处理含盐废水。0.75%和 1.5%NaCl 最初降低了 COD 和 NH4 (+)-N 的去除率，但随着 MBR 的运行，去除效率可以恢复。此外，胞外聚合物（EPS）和可溶性微生物产物（SMP）中的多糖在膜污染中起重要作用。16S rRNA 基因的 Illumina 测序表明，盐度的增加降低了微生物群落的多样性，较高的盐度刺激了拟杆菌门的生长。在属水平上，黄杆菌属、浮霉菌属、凝胶菌属、微杆菌属和噬冷菌属随着盐度的增加而增加，表现出较高的耐盐性。盐度的强度或盐度的持续时间可能会刺激具有相似功能的微生物，EPS 和 SMP 中多糖的变化与膜污染速率密切相关，并与一些耐盐属相关。
