膜污染
膜生物反应器
胞外聚合物
化学
结垢
生物反应器
废水
膜透性
制浆造纸工业
活性污泥
过滤(数学)
氧化剂
分段丝状菌
亚硝酸盐
细菌
食品科学
膜
环境工程
生物
生物膜
生物化学
环境科学
硝酸盐
工程类
有机化学
统计
遗传学
数学
作者
Li Sun,Jinxing Ma,LI Li-pin,Yu Tian,Zhong Zhang,Huaiyu Liao,Jibin Li,Wangwang Tang,Di He
出处
期刊:Water Research
[Elsevier]
日期:2020-08-01
卷期号:181: 115843-115843
被引量:46
标识
DOI:10.1016/j.watres.2020.115843
摘要
In this study, a coupled system of algal-sludge and membrane bioreactor (AS-MBR) was established for fouling control, and meanwhile the performance of wastewater treatment was enhanced. Results indicated that the AS-MBR increased the COD, NH4+-N, TN and PO43- -P removal efficiencies from 91.7% to 95.9%, 90.8%–96.9%, 22.0% to 34.3% and 18.4%–32.6%, respectively. Further analysis suggested that in the AS-MBR, the total specific oxygen utilization rate (SOUR), the SOUR of ammonia oxidizing bacteria and the SOUR of nitrite oxidizing bacteria were 26.6%, 58.5% and 52.4% higher than the control, respectively, indicating the improvement of microbial activities in AS-MBR. Additionally, the membrane fouling rates in the AS-MBR were 52.6% and 32.2% lower than the control in the slow and rapid fouling processes, respectively. A further mechanism investigation demonstrated that the concentrations of extracellular polymeric substance (EPS) were decreased by 19.8% and 22.1% in the mixed liquid and the fouling layer, respectively, after the inoculation of algae, which was expected to have a positive effect on the higher permeability and longer operation cycle of the membrane in the AS-MBR. More regular floc morphology was observed for the fouling layer on the membrane of AS-MBR, with the polysaccharides and proteins forming large clusters and channels in the fouling layer that likely decreased the filtration resistance. Consequently, high-throughput sequencing analysis revealed that the microbial community in the AS-MBR had higher abundances of bacteria and algae related to nutrients and organic matters degradation, which was beneficial for the improvement of wastewater treatment and alleviation of membrane fouling.
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