College of Chemistry and Environmental Engineering, Shenzhen University, Shenzhen 518060, PR China; Shenzhen Key Laboratory of Environmental Chemistry and Ecological Remediation, Shenzhen University, Shenzhen 518060, PR China.
State Key Laboratory of Pollution Control and Resource Reuse, College of Environmental Science and Engineering, Tongji University, 1239 Siping Road, Shanghai 200092, PR China.
Water Res. 2017 Dec 15;127:22-31. doi: 10.1016/j.watres.2017.10.004. Epub 2017 Oct 5.
This study assessed membrane biofouling and its gel layer of anoxic/oxic membrane bioreactor (A/O-MBR) for megacity municipal wastewater treatment during plum rain season, which was continuous rainy weather, in Yangtze River Delta, China. A laboratory-scale A/O-MBR was operated to treat the municipal wastewater from Quyang wastewater treatment plant, which located at the typical megacity of Shanghai in Yangtze River Delta, from April to July accompanying with plum rain season. As reactor performance showed, COD, NH-N, TN, TP of the influent gradually decreased during plum rain season, and inhibited pollutant removal due to organic carbon shortage. However, dissolve inorganic carbon and inorganic components in mixed liquid had an obvious increase under rainy weather. Membrane filtration results indicated that plum rain season enhanced pore blocking behavior, further leading to the serious membrane biofouling but inhibiting gel layer formation. Additionally, gel layer analysis predicted that plum rain season led to plenty of inorganic components and precipitate flew into A/O-MBR reactor. Inorganic components with elements of Ca, Mg Ba, Fe, Al and Si seriously blocked membrane pores. Those components also accumulated into gel layer in the form of SiO, CaCO, CaSiO, MgNHPO, BaCO, AlPO etc. Consequently, plum rain season enhanced pore blocking behavior and led to severe membrane biofouling but with the inhibition of gel layer formation.
本研究评估了梅雨季节（连续降雨天气）期间中国长江三角洲地区缺氧/好氧膜生物反应器（A/O-MBR）处理特大城市城市污水时的膜生物污染及其凝胶层。在梅雨季节，使用实验室规模的 A/O-MBR 处理来自上海典型特大城市的曲阳污水处理厂的城市污水。随着反应器性能的显示，梅雨季节期间，进水 COD、NH-N、TN、TP 逐渐降低，由于有机碳短缺，抑制了污染物的去除。然而，在雨天，混合液中的溶解无机碳和无机成分有明显增加。膜过滤结果表明，梅雨季节增强了孔堵塞行为，进一步导致严重的膜生物污染，但抑制了凝胶层的形成。此外，凝胶层分析预测，梅雨季节导致大量无机成分和沉淀物飞入 A/O-MBR 反应器。含有 Ca、Mg、Ba、Fe、Al 和 Si 等元素的无机成分严重堵塞了膜孔。这些成分还以 SiO、CaCO、CaSiO、MgNHPO、BaCO、AlPO 等形式在凝胶层中积累。因此，梅雨季节增强了孔堵塞行为，导致严重的膜生物污染，但抑制了凝胶层的形成。
