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首页> 外文期刊>Environmental Science & Technology >Alternating Current Influences Anaerobic Electroactive Biofilm Activity
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Alternating Current Influences Anaerobic Electroactive Biofilm Activity

机译：交流电影响厌氧电活性生物膜活性

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摘要

Alternating current (AC) is known to inactivate microbial growth in suspension, but how AC influences anaerobic biofilm activities has not been systematically investigated. Using a Geobader dominated anaerobic biofilm growing on the electrodes of microbial electrochemical reactors, we found that high frequency AC ranging from 1 MHz to 1 kHz (amplitude of 5 V, 30 min) showed only temporary inhibition to the biofilm activity. However, lower frequency (100 Hz, 1.2 or 5 V) treatment led to 47 ± 19％ permanent decrease in limiting current on the same biofilm, which is attributed to the action of electro- hydrodynamic force that caused biofilm damage and loss of intercellular electron transfer network. Confbcal microscopy images show such inactivation mainly occurred at the interface between the biofilm and the electrode. Reducing the frequency further to 1 Hz led to water electrolysis, which generated gas bubbles that flushed all attached cells out of the electrode. These findings provide new references on understanding and regulating biofilm growth, which has broader implications in biofouling control, anaerobic waste treatment, energy and product recovery, and general understanding of microbial ecology and physiology.
机译：交流电（AC）可以使悬浮液中的微生物生长失活，但是尚未对AC如何影响厌氧生物膜活性进行系统研究。使用在微生物电化学反应器的电极上生长的Geobader为主的厌氧生物膜，我们发现范围为1 MHz至1 kHz的高频AC（振幅为5 V，30分钟）仅显示了对生物膜活性的暂时抑制。然而，较低的频率（100 Hz，1.2或5 V）处理会导致同一生物膜上的极限电流永久降低47±19％，这归因于电动流体动力的作用，导致生物膜受损和细胞间电子损失传输网络。胶镜图像显示这种失活主要发生在生物膜和电极之间的界面。将频率进一步降低到1 Hz会导致水电解，产生的气泡会将所有附着的细胞冲洗出电极。这些发现为理解和调节生物膜的生长提供了新的参考，生物膜的控制，污物厌氧处理，能量和产品回收以及对微生物生态和生理的一般理解具有更广泛的意义。

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  • 来源
    《Environmental Science & Technology》 |2016年第17期|9169-9176|共8页
  • 作者

    Xin Wang; Lean Zhou; Lu Lu; Fernanda Leite Lobo; Nan Li; Heming Wang; Jaedo Park; Zhiyong Jason Ren;

  • 作者单位

    MOE Key Laboratory of Pollution Processes and Environmental Criteria/Tianjin Engineering Center of Environmental Diagnosis and Contamination Remediation, Nankai University, No. 38 Tongyan Road, Jinnan District, Tianjin 300350, China;

    MOE Key Laboratory of Pollution Processes and Environmental Criteria/Tianjin Engineering Center of Environmental Diagnosis and Contamination Remediation, Nankai University, No. 38 Tongyan Road, Jinnan District, Tianjin 300350, China;

    Department of Civil, Environmental, and Architectural Engineering, University of Colorado Boulder, Boulder, Colorado 80309, United States;

    Department of Civil, Environmental, and Architectural Engineering, University of Colorado Boulder, Boulder, Colorado 80309, United States;

    Tianjin Key Lab of Indoor Air Environmental Quality Control, School of Environmental Science and Engineering, Tianjin University, No. 92 Weijin Road, Nankai District, Tianjin 300072, China;

    Department of Civil, Environmental, and Architectural Engineering, University of Colorado Boulder, Boulder, Colorado 80309, United States;

    Department of Electrical Engineering, University of Colorado Denver, Denver, Colorado 80204, United States;

    Department of Civil, Environmental, and Architectural Engineering, University of Colorado Boulder, Boulder, Colorado 80309, United States;

  • 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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