Journal
BIORESOURCE TECHNOLOGY
Volume 266, Issue -, Pages 51-59Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.biortech.2018.06.067
Keywords
Sponge membrane bioreactor; Fiber bundle anoxic filter; Soluble microbial product (SMP); Membrane fouling; Saline wastewater treatment
Funding
- National Natural Science Fund of China [51408158]
- China Postdoctoral Science Foundation [2017M612278]
- Shandong Provincial Natural Science Foundation, China [ZR2017MEE020, ZR2017PEE008]
- Fundamental Research Funds for the Central Universities [HIT.NSRIF.2016098]
- scientific research foundation of Harbin institute of technology at Weihai [HIT(WH)201403]
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Membrane fouling mitigation was observed during the development of novel sponge membrane bioreactor coupled with fiber bundle anoxic bio-filter (AF-MBMBR). Soluble microbial product (SMP) was found to be positively correlated with membrane fouling. To further clarify the mechanism of fouling mitigation, the effects of bio-carriers (sponge and fiber bundles) on characteristics and fouling potential of SMP were investigated. Characterization of SMP implied that as a consequence of employing bio-carriers, tyrosine and tryptophan in SMP significantly decreased, instead relative proportions of humic and fulvic acids increased. Meanwhile, batch filtration tests demonstrated that fouling potential of SMP was significantly alleviated, flux decline caused by filtrating SMP decreased from 84.5% to 60.1%. Further analysis on foulants and filtrate revealed that proteins performed high adhesion propensity on membrane while humic and fulvic acids mainly can pass through the membrane; this finding could well explain the mitigation of SMP fouling potential induced by bio-carriers.
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