Journal
BIORESOURCE TECHNOLOGY
Volume 214, Issue -, Pages 729-736Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.biortech.2016.05.022
Keywords
Partial nitrification; Anammox; MBR; Membrane fouling; Microbial products
Funding
- National Natural Science Foundations of China [21261140336, 51308007, 51478006]
- Strategic International Research Cooperative Program (SICP) of Japan Science and Technology Agency (JST), Ministry of Education, Culture, Sport, Science and Technology, Japan (MEXT)
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In this study, two times more serious membrane fouling was found in anammox membrane bioreactor, compared to partial nitrification membrane bioreactor (PN-MBR) operated at the same nitrogen loading rate. By protein, polysaccharide, amino acids and functional groups analysis, it was found that the discrepancy in membrane fouling was virtually due to the difference in microbial products of nitrifiers and anammox bacteria. Protein and polysaccharide were main foulants on membrane surface; meanwhile theirs content and ratio in the EPS, supernatant and membrane surface were significantly different in PN-MBR and anammox-MBR. The anammox metabolism products contained much more hydrophobic organics, hydrophobic amino acids, and hydrophobic functional groups than nitrifiers. A mass of anammox bacteria as well as hydrophobic metabolism products deposited on the hydrophobic membrane surface and formed serious fouling. In further, hydrophilic modification is more urgently needed to mitigate membrane fouling when running anammox-MBR, than PN-MBR. (C) 2016 Published by Elsevier Ltd.
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