Direct and indirect effects of membrane pore size on fouling development in a submerged membrane bioreactor with a symmetric chlorinated poly (vinyl chloride) flat-sheet membrane
Direct and indirect effects of membrane pore size on fouling development in a submerged membrane bioreactor with a symmetric chlorinated poly (vinyl chloride) flat-sheet membrane
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DOI：
10.1016/j.jece.2021.107023
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发表时间：
2021-12
影响因子：
7.7
通讯作者：
T. Sano;Y. Kawagoshi;Ituki Kokubo;Hiroaki Ito;K. Ishida;A. Sato
中科院分区：
文献类型：
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作者：
T. Sano;Y. Kawagoshi;Ituki Kokubo;Hiroaki Ito;K. Ishida;A. Sato
膜生物反应器(MBR)因其优良的固液分离性能而被公认为是一种很有前途的废水处理技术，但污染的发展仍然是一个令人担忧的问题。本研究以自制的不同孔径的氯化聚氯乙烯(CPVC)平板膜为研究对象，考察了膜孔径与膜污染发展的关系，并对膜污染发展的机理进行了探讨。在本研究条件下，抑制膜污染发展的最佳膜孔径为0.31~0.57 µm，不可逆膜污染与膜内蛋白质类化合物的捕获密切相关，相反，膜表面形成凝胶层和饼状层是造成可逆膜污染的主要原因。此外，研究还表明，膜孔径通过与膜表面粗糙度等膜特性之间的相互关系，直接或间接地影响可逆和不可逆污染。最后得出结论：抑制污染发展的最佳膜孔径取决于不可逆和可逆污染现象引起的总过滤阻力。
Membrane bioreactors (MBRs) have been recognized as a promising wastewater treatment technique because of their superior solid–liquid separation performance; however, fouling development remains a concern. In this study, the relationship between membrane pore size and fouling development is investigated using originally prepared chlorinated polyvinyl chloride (CPVC) flat-sheet membranes with different pore sizes in MBRs; further, the mechanism of fouling development is demonstrated. Under the conditions in this study, the optimal membrane pore size for suppressing fouling development was determined to be in the range of 0.31–0.57 µm. It was also demonstrated that irreversible fouling is closely related to the capture of protein-like compounds inside the membrane; in contrast, it was considered that reversible fouling is caused by gel and cake layers formed on the membrane surface. Moreover, it was indicated that the membrane pore size directly and indirectly affected both reversible and irreversible fouling through the mutual relationship with other membrane characteristics such as the surface roughness. Finally, it is concluded that the optimal membrane pore size for suppressing fouling development is determined by the total filtration resistance caused by irreversible and reversible fouling phenomena.