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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.