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首页> 外文期刊>Applied Microbiology and Biotechnology >Effect of solid retention time on membrane fouling in membrane bioreactor: from the perspective of quorum sensing and quorum quenching
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Effect of solid retention time on membrane fouling in membrane bioreactor: from the perspective of quorum sensing and quorum quenching

机译：固相保留时间对膜生物反应器中膜污染的影响：从群体感应和群体猝灭的角度

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摘要

Solid retention time (SRT) is one of the most important operational parameters in membrane bioreactor (MBR), which significantly influences membrane fouling. It is widely recognized that SRT mainly changes biomass characteristics, and then, influences membrane fouling. Effect of SRT on quorum sensing (QS) in MBR, which could also influence fouling by coordinating biofilm formation, has not been reported. In this study, fouling, QS, soluble microbial products (SMP), and extracellular polymer substances (EPS) in MBRs operated under SRTs of 4, 10, and 40 days were investigated. The results showed that as SRT increased, the abundance of quorum quenching (QQ) bacteria increased, the quorum signal degradation activity of activated sludge increased, the concentrations of signal molecules in MBR decreased, the excretion of SMP and EPS decreased, and thus membrane biofouling was alleviated. Therefore, besides altering the biomass physiochemical properties, SRT also changed the balance between QS and QQ in MBR, and in this way, influenced membrane biofouling.
机译：固体保留时间（SRT）是膜生物反应器（MBR）中最重要的操作参数之一，它会显着影响膜污染。众所周知，SRT主要改变生物质特性，然后影响膜污染。尚未报道过SRT对MBR中群体感应（QS）的影响，该影响也可能通过协调生物膜的形成而影响结垢。在这项研究中，研究了在4、10和40天的SRT下运行的MBR中的结垢，QS，可溶性微生物产物（SMP）和细胞外聚合物物质（EPS）。结果表明，随着SRT的增加，群体猝灭（QQ）细菌的数量增加，活性污泥的群体信号降解活性增加，MBR中信号分子的浓度降低，SMP和EPS的排泄量减少，从而膜生物污染被缓解了。因此，SRT除了改变生物量的理化特性外，还改变了MBR中QS和QQ之间的平衡，从而影响了膜生物污染。

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