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首页> 外文期刊>RSC Advances >Biofouling control in a membrane filtration system by a newly isolated novel quorum quenching bacterium, Bacillus methylotrophicus sp WY
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Biofouling control in a membrane filtration system by a newly isolated novel quorum quenching bacterium, Bacillus methylotrophicus sp WY

机译：新分离的新型群体猝灭细菌甲基芽孢杆菌WY在膜过滤系统中的生物污染控制

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摘要

During membrane processes of wastewater treatment, biofouling is a critical issue affecting membrane performance. Interspecies quorum quenching (QQ) by bacterial cells has been reported as a novel approach for mitigating the biofouling via restraining quorum sensing (QS), where secreted signaling molecules, e.g., acyl homoserine lactones (AHLs) being essential for biofilm formation are degraded by QQ bacteria. Herein, we isolated a novel indigenous QQ bacterium, Bacillus methylotrophicus strain WY from real wastewater sludge for controlling membrane biofouling. Strain WY was successfully characterized for QS and QQ activity and possessed a wide-ranging activity for degrading AHLs. More than 90% degradation for C8-HSL, C10-HSL, C12-HSL, C14-HSL, 3-oxo-C6HSL, 3-oxo-C8HSL and 3-oxo-C12HSL were achieved. Further, sodium alginate beads immobilized strain WY cells were applied to the microfiltration process. Compared to the vacant beads, using the beads with stain WY increased membrane flux by 3 to 4 times, demonstrating excellent biofouling control ability of strain WY.
机译：在废水处理的膜过程中，生物结垢是影响膜性能的关键问题。据报道，细菌细胞间种间群体猝灭（QQ）是一种通过抑制群体感应（QS）来减轻生物污染的新方法，其中通过QQ降解了对于生物膜形成必不可少的分泌信号分子，例如酰基高丝氨酸内酯（AHL）。菌。在这里，我们从真实的废水污泥中分离出一种新型的本地QQ细菌，甲基芽孢杆菌WY菌株，以控制膜生物污染。 WY菌株成功地表征了QS和QQ活性，并具有广泛的降解AHL的活性。 C8-HSL，C10-HSL，C12-HSL，C14-HSL，3-oxo-C6HSL，3-oxo-C8HSL和3-oxo-C12HSL的降解率超过90％。此外，将固定有藻酸钠珠的菌株WY细胞应用于微滤过程。与空珠相比，使用带有污渍WY的珠使膜通量增加3至4倍，证明了菌株WY具有出色的生物污染控制能力。

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