Key Laboratory of Industrial Ecology and Environmental Engineering (MOE), School of Environmental Science and Technology, Dalian University of Technology, No.2 Linggong Road, Dalian 116024, China.
Key Laboratory of Industrial Ecology and Environmental Engineering (MOE), School of Environmental Science and Technology, Dalian University of Technology, No.2 Linggong Road, Dalian 116024, China.
Sci Total Environ. 2020 Aug 10;729:138663. doi: 10.1016/j.scitotenv.2020.138663. Epub 2020 Apr 23.
Anaerobic forward osmosis membrane bioreactor (AnOMBR) is a potential wastewater treatment technology, due to its low energy consumption and high effluent quality. However, membrane fouling is still a considerable problem which causes dwindling of water flux and shortening the membrane lifetime. In this study, electro-assisted anaerobic forward osmosis membrane bioreactor (AnOMEBR) was developed to treat wastewater and mitigate membrane fouling, in which the conductive FO membrane was used both as the separation unit and cathode. The formation, development and alleviation of membrane fouling in AnOMEBR were investigated. The results showed that the soluble microbial products (SMP) content and the proteins/polysaccharides (PN/PS) value in AnOMEBR were 26% and 15% lower than that in AnOMBR, respectively. The absolute value of Zeta of sludge mixture in AnOMEBR was 1.2 times that of the AnOMBR. The increase in the interaction between the membrane surface and the negatively charged foulants could inhibit the adsorption of foulants on membrane surface in the initial stage of membrane fouling. The strong interaction among foulants further affected the composition, structure and thickness of the cake layer on the FO membrane surface. AnOMEBR with a shorter hydraulic retention time, a higher organic loading rate and a lower osmotic pressure difference, could still obtain a lower flux decline rate of 0.063 LMH/h, which was 35.7% lower than AnOMBR. The wastewater treatment capacity of AnOMEBR was nearly 1.5 times that of the AnOMBR. This work provides an efficient strategy for mitigating membrane fouling and improving wastewater treatment capacity.
厌氧正向渗透膜生物反应器（AnOMBR）是一种很有前途的废水处理技术，因为它的能耗低，出水水质高。然而，膜污染仍然是一个相当大的问题，它会导致水通量下降和膜寿命缩短。在这项研究中，开发了电辅助厌氧正向渗透膜生物反应器（AnOMEBR）来处理废水并减轻膜污染，其中导电 FO 膜既作为分离单元又作为阴极。研究了 AnOMEBR 中膜污染的形成、发展和缓解。结果表明，AnOMEBR 中的可溶性微生物产物（SMP）含量和蛋白质/多糖（PN/PS）值分别比 AnOMBR 低 26%和 15%。AnOMEBR 中污泥混合物的 Zeta 值绝对值是 AnOMBR 的 1.2 倍。在膜污染的初始阶段，膜表面与带负电荷的污染物之间的相互作用增强，可以抑制污染物在膜表面的吸附。污染物之间的强烈相互作用进一步影响 FO 膜表面的滤饼层的组成、结构和厚度。AnOMEBR 具有较短的水力停留时间、较高的有机负荷率和较低的渗透压差，仍能获得较低的通量衰减率 0.063 LMH/h，比 AnOMBR 低 35.7%。AnOMEBR 的废水处理能力几乎是 AnOMBR 的 1.5 倍。这项工作为减轻膜污染和提高废水处理能力提供了一种有效的策略。
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