School of Environmental Engineering, Xuzhou University of Technology, No. 2 Lishui Road, Xuzhou 221111, China.
Foreign Environmental Cooperation Center, Ministry of Ecology and Environment, No. 5 Houyingfang Hutong, Xicheng District, Beijing 100035, China.
Int J Environ Res Public Health. 2020 Mar 5;17(5):1681. doi: 10.3390/ijerph17051681.
A hybrid membrane bioreactor (HMBR) employing activated sludge and biofilm simultaneously is proved to represent a good performance on membrane fouling control compared to conventional membrane bioreactor (CMBR) by reducing extracellular polymeric substances (EPS), especially bound EPS (B-EPS). In order to better understand the mechanism of membrane fouling control by the HMBR in regard of microbial community composition, a pilot scale HMBR operated to treat domestic wastewater for six months, and a CMBR operated at the same time as control group. Results showed that HMBR can effectively control membrane fouling. When transmembrane pressure reached 0.1 MPa, the membrane module in the HMBR operated for about 26.7% longer than that in the CMBR. In the HMBR, the quantity of EPS was significantly lower than that in the CMBR. In this paper, soluble EPS was also found to have a close relationship with cake layer resistance. The species richness and diversity in the HMBR were higher than those in the CMBR, and a certain difference between the compositions of microbial communities in the two reactors was confirmed. Therefore, the difference in microbial community compositions may be the direct reason why EPS in the HMBR was lower than that in the CMBR.
采用活性污泥和生物膜相结合的混合膜生物反应器（HMBR）被证明在控制膜污染方面比传统膜生物反应器（CMBR）具有更好的性能，因为它可以减少胞外聚合物物质（EPS），特别是结合态 EPS（B-EPS）。为了更好地了解 HMBR 控制膜污染的微生物群落组成机制，在中试规模上采用 HMBR 处理生活污水 6 个月，并与同时运行的 CMBR 作为对照组。结果表明，HMBR 可以有效地控制膜污染。当跨膜压力达到 0.1 MPa 时，HMBR 中的膜组件的运行时间比 CMBR 中的膜组件长约 26.7%。在 HMBR 中，EPS 的数量明显低于 CMBR。在本文中，还发现可溶 EPS 与滤饼阻力密切相关。HMBR 中的物种丰富度和多样性均高于 CMBR，并且两个反应器中的微生物群落组成存在一定差异。因此，微生物群落组成的差异可能是 HMBR 中 EPS 低于 CMBR 的直接原因。
