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Mitchell, Robert J.
Applied & Environmental Microbiology Lab (AEML)
Research Interests
  • Drug-Resistant Pathogens, Bdellovibrio bacteriovorus, patho-biotechnology


Assessing the effects of bacterial predation on membrane biofouling

DC Field Value Language Kim, Eun-Ho ko Dwidar, Mohammed ko Mitchell, Robert J. ko Kwon, Young-Nam ko 2014-04-10T02:34:45Z - 2013-08-20 ko 2013-10 ko
dc.identifier.citation WATER RESEARCH, v.47, no.16, pp.6024 - 6032 ko
dc.identifier.issn 0043-1354 ko
dc.identifier.uri -
dc.description.abstract Membrane biofouling is one of the major obstacles limiting membrane applications in water treatment. In this study, Bdellovibrio bacteriovorus HD 100, a Gram-negative predatory bacterium, was evaluated as a novel way to mitigate membrane biofouling and its subsequent performance decline. Dead-end microfiltration (MF) tests were carried out on Escherichia coli DH5α and B. bacteriovorus HD 100 co-culture feed solutions. Predation of E. coli was performed at either a low or high multiplicity of infection (MOI), which is defined as the predator to prey cell ratio. The MOIs tested were 2 and 200, and the viability of both the E. coli prey and the predator was monitored over 48 h. The higher MOI (high predator, HP) culture showed a nearly 6-log loss in E. coli number after 24 h when compared to both the control and low MOI (low predator, LP) cultures, whereas the E. coli population within both predated cultures (HP and LP) became nearly identical at 48 h and 4-log lower than that of the control. The unpredated cultures led to significant loss in water flux at 12, 24, and 48 h of culture, but the HP and LP membranes showed less loss of flux by comparison. Analysis of the total membrane resistance showed a similar trend as the flux decline pattern; however, irreversible resistance of the membrane was much higher for the 48 h LP culture compared to the unpredated and HP cultures at 48 h. This increase in irreversible resistance was attributed mainly to E. coli debris, which accumulated in the medium after the predator lysed the prey cells. These results show that pretreatment of wastewater using a suitable concentration of predatory bacteria such as B. bacteriovorus can enhance membrane performance. ko
dc.description.statementofresponsibility close -
dc.language 영어 ko
dc.title Assessing the effects of bacterial predation on membrane biofouling ko
dc.type ARTICLE ko
dc.identifier.scopusid 2-s2.0-84885369591 ko
dc.identifier.wosid 000326910000007 ko
dc.type.rims ART ko
dc.description.wostc 1 *
dc.description.scopustc 0 * 2014-10-18 * 2013-12-26 *
dc.identifier.doi 10.1016/j.watres.2013.07.023 ko
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