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首页> 外文期刊>Environmental Science & Technology >Membrane Distillation Biofouling: Impact of Feedwater Temperature on Biofilm Characteristics and Membrane Performance
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Membrane Distillation Biofouling: Impact of Feedwater Temperature on Biofilm Characteristics and Membrane Performance

机译：膜蒸馏生物污染：给水温度对生物膜特性和膜性能的影响

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摘要

Membrane distillation (MD) is a temperature driven membrane separation technology that holds great potential for decentralized and sustainable wastewater treatment systems. Yet, similarly to all membrane based systems, microbial fouling (biofouling) might be a critical hurdle for MD wastewater treatment applications. In this study we determined the impact of increasing feedwater temperatures (47 degrees C, 55 degrees C, and 65 degrees C) on biofilm growth and MD performance via dynamic biofouling experiments with Anoxybacillus sp. as a model bacterium. Our results indicated that cell growth was reduced at 47 degrees C, resulting in moderate distillate water flux decline (30%). Differently, extensive growth of Anoxybacillus sp. at feedwater temperature of 55 degrees C caused severe distillate water flux decline (78%). Additionally, biofouling induced membrane wetting, which facilitated the passage of bacteria cells and endospores through the membrane structure into the distillate. Although bacterial growth was impaired at feedwater temperatures of 65 degrees C, excessive production of EPS (compared to bacterial abundance) crippled membrane separation due to severe pore wetting. These results underline the importance of optimized operating conditions and development of antibiofouling and antiwetting membranes for successful implementation of MD in wastewater treatment with high biofouling propensity.
机译：膜蒸馏（MD）是一种温度驱动的膜分离技术，在分散和可持续的废水处理系统中具有巨大的潜力。然而，类似于所有基于膜的系统，微生物污染（生物污染）可能是MD废水处理应用的关键障碍。在这项研究中，我们通过使用Anoxybacillus sp。进行的动态生物污染实验，确定了进水温度升高（47摄氏度，55摄氏度和65摄氏度）对生物膜生长和MD性能的影响。作为模型细菌。我们的结果表明，在47摄氏度时细胞生长减少，导致馏出水通量下降适度（30％）。不同的是，Anoxybacillus sp。的广泛生长。在给水温度为55摄氏度时，导致馏出水通量严重下降（78％）。另外，生物结垢引起膜润湿，其促进细菌细胞和内生孢子通过膜结构进入馏出物。尽管在给水温度为65摄氏度时细菌生长受到损害，但由于严重的孔润湿，EPS的过量产生（与细菌丰度相比）使膜分离受损。这些结果强调了优化操作条件和开发抗污垢和防湿膜的重要性，这对于成功地在具有高生物污垢倾向的废水处理中成功实施MD是至关重要的。

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  • 来源
    《Environmental Science & Technology》 |2018年第17期|10019-10029|共11页
  • 作者

    Bogler Anne; Bar-Zeev Edo;

  • 作者单位

    Ben Gurion Univ Negev, Zuckerberg Inst Water Res, Jacob Blaustein Inst Desert Res, IL-84990 Sede Boqer, Israel;

    Ben Gurion Univ Negev, Zuckerberg Inst Water Res, Jacob Blaustein Inst Desert Res, IL-84990 Sede Boqer, Israel;

  • 收录信息 美国《科学引文索引》(SCI);美国《工程索引》(EI);美国《生物学医学文摘》(MEDLINE);美国《化学文摘》(CA);
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  • 正文语种 eng
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