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- 저자 : Scott A. Rice (검색결과 3 건)
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Quorum quenching bacteria can be used to inhibit the biofouling of reverse osmosis membranes
Oh, Hyun-Suk,Tan, Chuan Hao,Low, Jiun Hui,Rzechowicz, Miles,Siddiqui, Muhammad Faisal,Winters, Harvey,Kjelleberg, Staffan,Fane, Anthony G.,Rice, Scott A. Pergamon Press 2017 Water research Vol.112 No.-
<P><B>Abstract</B></P> <P>Over the last few decades, significant efforts have concentrated on mitigating biofouling in reverse osmosis (RO) systems, with a focus on non-toxic and sustainable strategies. Here, we explored the potential of applying quorum quenching (QQ) bacteria to control biofouling in a laboratory-scale RO system. For these experiments, <I>Pantoea stewartii</I> was used as a model biofilm forming organism because it was previously shown to be a relevant wastewater isolate that also forms biofilms in a quorum sensing (QS) dependent fashion. A recombinant <I>Escherichia coli</I> strain, which can produce a QQ enzyme, was first tested in batch biofilm assays and significantly reduced biofilm formation by <I>P. stewartii</I>. Subsequently, RO membranes were fouled with <I>P. stewartii</I> and the QQ bacterium was introduced into the RO system using two different strategies, direct injection and immobilization within a cartridge microfilter. When the QQ bacterial cells were directly injected into the system, <I>N-</I>acylhomoserine lactone signals were degraded, resulting in the reduction of biofouling. Similarly, the QQ bacteria controlled biofouling when immobilized within a microfilter placed downstream of the RO module to remove QS signals circulating in the system. These results demonstrate the proof-of-principle that QQ can be applied to control biofouling of RO membranes and may be applicable for use in full-scale plants.</P> <P><B>Highlights</B></P> <P> <UL> <LI> A recombinant Quorum Quenching (QQ) bacterium controlled biofilm formation. </LI> <LI> Direct injection of QQ bacteria in a lab-scale RO system mitigated biofouling. </LI> <LI> QQ bacteria controlled biofouling when immobilized within a microfilter cartridge. </LI> </UL> </P> <P><B>Graphical abstract</B></P> <P>[DISPLAY OMISSION]</P>
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Seonki Lee,Huijuan Xu,Scott A. Rice,Tzyy Haur Chonga,오현석 한국공업화학회 2021 Journal of Industrial and Engineering Chemistry Vol.94 No.-
Biofouling is recognized as one of the most problematic fouling types in reverse osmosis (RO) processesand lead to high energy requirements and operating costs. Over the past decade, many studies onmembrane bioreactor (MBR) systems for wastewater applications demonstrated that disrupting cell-cellcommunications among bacteria, called quorum quenching (QQ), is a promising approach to inhibitbiofouling of membranes. Here, we developed the QQ-column as a novel strategy to control biofouling inRO systems. The QQ-column was prepared by incorporating a recombinant bacterial QQ strain intohydrogel beads and embedding these beads inside a column. The QQ-column was installed upstream ofthe RO module to degrade N-acyl homoserine lactone, a quorum sensing (QS) signal, from the feed in alaboratory-scale RO system operating in total recycle mode. The QQ-column reduced the concentrationsof signal molecules by29% in an RO system and mitigated biofilm formation (38.6% reduction of cellnumber) on the membrane, consequently reducing the transmembrane pressure by 50.1%. These resultsdemonstrate that integrating QQ bacteria into columns is a practical method to control biofouling in ROsystems.
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