Journal
MEMBRANES
Volume 11, Issue 2, Pages -Publisher
MDPI
DOI: 10.3390/membranes11020108
Keywords
membrane bioreactor; ceramic tubular membrane; cake layer; bacteria; archaea
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Funding
- Program of China-Sri Lanka Joint Center for Water Technology Research and Demonstration by the Chinese Academy of Sciences (CAS)
- China-Sri Lanka, Joint Center for Education and Research by the CAS
- Joint Research Program of National Natural Science Foundation of China and National Science Foundation of Sri Lanka (NSFC-NSF SL) [21861142020]
- Chinese Government Scholarship Program (CSC) [2017GXZ010437]
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The study reveals that proteins and soluble microbial by-products are the dominant foulants in the cake layer, accounting for 69% of the total membrane resistance. The archaeal and bacterial communities in the cake layer are mostly similar to those in the anaerobic bulk sludge. This finding may contribute to the development of antifouling membranes for AnMBR treating domestic wastewater.
Cake layer formation is an inevitable challenge in membrane bioreactor (MBR) operation. The investigations on the cake layer microbial community are essential to control biofouling. This work studied the bacterial and archaeal communities in the cake layer, the anaerobic sludge, and the membrane cleaning solutions of anaerobic membrane bioreactor (AnMBR) with yttria-based ceramic tubular membrane by polymerase chain reaction (PCR) amplification of 16S rRNA genes. The cake layer resistance was 69% of the total membrane resistance. Proteins and soluble microbial by-products (SMPs) were the dominant foulants in the cake layer. The pioneering archaeal and bacteria in the cake layer were mostly similar to those in the anaerobic bulk sludge. The dominant biofouling bacteria were Proteobacteria, Bacteroidetes, Firmicutes, and Chloroflexi and the dominant archaeal were Methanosaetacea and Methanobacteriacea at family level. This finding may help to develop antifouling membranes for AnMBR treating domestic wastewater.
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