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首页> 外文期刊>Environmental Science & Technology >Ecological and Transcriptional Responses of Anode-Respiring Communities to Nitrate in a Microbial Fuel Cell
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Ecological and Transcriptional Responses of Anode-Respiring Communities to Nitrate in a Microbial Fuel Cell

机译：阳极呼吸社区对微生物燃料电池中硝酸盐的生态和转录响应

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摘要

A poorly understood phenomenon with a potentially significant impact on electron recovery is competition in microbial fuel cells (MFC) between anode-respiring bacteria and microorganisms that use other electron acceptors. Nitrate is a constituent of different wastewaters and can act as a competing electron acceptor in the anode. Studies investigating the impact of competition on population dynamics in mixed communities in the anode are lacking. Here, we investigated the impact of nitrate at different C/N ratios of 1.8, 3.7, and 7.4 mg C/mg Ν on the electrochemical performance and the biofilm community in mixed-culture chemostat MFCs. The electrochemical performance of the MFC was not affected under electron donor non-limiting conditions, 7.4 mg C/mg Ν. At lower C/N, electron donor limiting and ratio electron recovery were significantly affected. The electrochemical performance recovered upon removal of nitrate at 3.7 mg C/mg Ν but did not at 1.8 mg C/mg Ν. Microbial community analysis showed a decrease in Deltaproteobacteria accompanied by an increase in Betaproteobacteria in response to nitrate at low C/N ratios and no significant changes at 7.4 mg C/mg Ν. Transcriptional analysis showed increased transcription of nirK and nirS genes during nitrate flux, suggesting that denitrification to N_2 and not facultative nitrate reduction by Geobacter spp. might be the primary response to perturbation with nitrate.
机译：一个对电子回收有潜在重大影响的鲜为人知的现象是，在微生物燃料电池（MFC）中，阳极呼吸细菌与使用其他电子受体的微生物之间的竞争。硝酸盐是不同废水的成分，可在阳极中充当竞争电子受体。缺乏研究竞争对阳极混合社区人口动态影响的研究。在这里，我们研究了硝酸盐在1.8、3.7和7.4 mg C / mg N的不同C / N比下对混合培养Chemostat MFCs的电化学性能和生物膜群落的影响。在电子给体非限制性条件7.4mg C / mg N下，MFC的电化学性能不受影响。在较低的C / N下，显着影响电子给体的极限和电子回收率。在去除3.7mg C / mg N的硝酸盐后，电化学性能恢复，但在1.8mg C / mg N的硝酸盐未去除。微生物群落分析显示，在低C / N比率下，硝酸盐对Delta的影响是Deltaproteobacteria减少，而Betaproteobacteria则增加，而在7.4 mg C / mg N时无明显变化。转录分析表明，硝酸盐通量过程中nirK和nirS基因的转录增加，这表明反硝化作用还原为N_2，而不是由Geobacter spp引起的兼性硝酸盐还原。可能是对硝酸盐摄动的主要反应。

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  • 来源
    《Environmental Science & Technology》 |2017年第9期|5334-5342|共9页
  • 作者

    Varun N. Srinivasan; Caitlyn S. Buder;

  • 作者单位

    Department of Civil and Environmental Engineering, University of Massachusetts-Amherst, Amherst, Massachusetts 01003, United States;

    Department of Civil and Environmental Engineering, University of Massachusetts-Amherst, Amherst, Massachusetts 01003, 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);
  • 原文格式 PDF
  • 正文语种 eng
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  • 入库时间 2022-08-17 13:57:31

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