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Mitigating Seawater Desalination Membrane Biofouling using Quorum Sensing Inhibitors.

机译：使用Quorum感应抑制剂缓解海水淡化膜生物污染。

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摘要

Coastal seawater desalination using reverse osmosis (RO) membranes has the potential to alleviate water stress in arid regions. However, membrane biofouling, caused by bacterial biofilm formation, is a significant challenge for seawater desalination plants. Biofilm formation is regulated by quorum sensing (QS) pathways where bacteria secrete auto-inducer molecules to communicate with neighboring bacteria to activate biofilm formation. This research investigated the role of the QS system and the effect of QS inhibiting (QSIs) compounds on marine biofilm production and membrane biofouling. This study revealed that four different marine bacteria isolated from fouled RO membranes in a desalination plant produced two low molecular weight auto-inducer 1 (AI-1) QS molecules. Vanillin and cinnamaldehyde were then identified as the most effective QSI compounds with reduction of marine biofilm formed by RO membrane biofouling isolates and native uncultured seawater bacterial communities by more than 79% and 70%, respectively in a microtiter plate assay. Further investigation into the anti-biofouling capabilities of vanillin and cinnamaldehyde in a cross-flow membrane bio-monitoring system indicated that vanillin in the bulk fluid (1200 mg/L) significantly reduced extracellular polysaccharides (>40%) and dead cells (>20%) on the RO membrane surface. In order to improve the membrane in-situ anti-biofouling potential, vanillin and cinnamaldehyde were physically adsorbed onto various RO membrane surfaces. The addition of the QSI layer on the RO membrane surface significantly altered the membrane surface contact angle along with a less than 16% reduction in pure water permeability, but there was no significant change in salt rejection compared to unmodified membranes. Under biofouling conditions consisting of four mixed marine bacterial species in a high pressure RO system, QSI modified membranes experienced a minimal loss in permeate flux compared to unmodified membranes. Extracellular polysaccharide production, live cells, and dead cells were significantly suppressed on vanillin and cinnamaldehyde modified membrane surfaces by more than 15%, 58%, and 61%, respectively. These findings indicate that QSIs have the potential to suppress marine biofilm formation and membrane biofouling for seawater desalination.
机译：使用反渗透（RO）膜的沿海海水淡化具有减轻干旱地区水压力的潜力。然而，由细菌生物膜形成引起的膜生物结垢是海水淡化厂的重大挑战。生物膜的形成受群体感应（QS）途径调控，在该途径中，细菌分泌自诱导分子与邻近细菌沟通以激活生物膜的形成。这项研究调查了QS系统的作用以及QS抑制（QSIs）化合物对海洋生物膜生产和膜生物污染的影响。这项研究表明，在海水淡化厂从污染的反渗透膜中分离出的四种不同海洋细菌产生了两个低分子量自动诱导剂1（AI-1）QS分子。然后，在微量滴定板分析中，香草醛和肉桂醛被确定为最有效的QSI化合物，其反渗透膜生物污染分离物和未培养的海水细菌群落形成的海洋生物膜分别减少了79％和70％以上。对香兰素和肉桂醛在错流膜生物监测系统中的抗生物结垢能力的进一步研究表明，散装液体中的香兰素（1200 mg / L）显着减少了细胞外多糖（> 40％）和死细胞（> 20） ％）在反渗透膜表面。为了提高膜原位的抗生物结垢能力，将香兰素和肉桂醛物理吸附到各种反渗透膜表面。在RO膜表面上添加QSI层可显着改变膜表面接触角，同时纯净水渗透率降低不到16％，但与未改性膜相比，脱盐率没有显着变化。在高压反渗透系统中，由四种混合海洋细菌组成的生物污染条件下，与未改性膜相比，QSI改性膜的渗透通量损失最小。香草醛和肉桂醛修饰的膜表面分别显着抑制了细胞外多糖的产生，活细胞和死细胞的抑制，分别超过15％，58％和61％。这些发现表明，QSI具有抑制海水淡化海洋生物膜形成和膜生物结垢的潜力。

著录项

  • 作者

    Katebian, Leda.;

  • 作者单位

    University of California, Irvine.;

  • 授予单位 University of California, Irvine.;
  • 学科 Engineering.;Environmental engineering.
  • 学位 Ph.D.
  • 年度 2016
  • 页码 99 p.
  • 总页数 99
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

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