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首页> 外文期刊>Environmental Science & Technology >Biocathodic Nitrous Oxide Removal in Bioelectrochemical Systems
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Biocathodic Nitrous Oxide Removal in Bioelectrochemical Systems

机译：生物电化学系统中生物阴极一氧化二氮的去除

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摘要

Anthropogenic nitrous oxide (N_2O) emissions represent up to 40% of the global N_2O emission and are constantly increasing. Mitigation of these emissions is warranted since N_2O is a strong greenhouse gas and important ozone-depleting compound. Until now, only physicochemical technologies have been applied to mitigate point sources of N_2O, and no biological treatment technology has been developed so far. In this study, a bioelectrochemical system (BES) with an autotrophic denitrifying biocathode was considered for the removal of N_2O. The high N_2O removal rates obtained ranged between 0.76 and 1.83 kg N m~(-3) net cathodic compartment (NCC) d~' and were proportional to the current production, resulting in cathodic coulombk efficiencies near 100%. Furthermore, our experiments suggested the active involvement of microorganisms as the catalyst for the reduction of N_2O to N_2 and the optimal cathode potential ranged from -200 to 0 mVvs standard hydrogen electrode (SHE) in order to obtain high conversion rates. Successful operation of the system for more than 115 days with N_2O as the sole cathodic electron acceptor strongly indicated that N_2O respiration yielded enough energy to maintain the biological process. To our knowledge, this study provides for the first time proof of concept of biocathodic N_2O removal at long-term without the need for high temperatures and expensive catalysts.
机译：人为一氧化二氮（N_2O）排放量占全球N_2O排放量的40％，并且还在不断增加。由于N_2O是强温室气体和重要的臭氧消耗化合物，因此有必要减少这些排放。迄今为止，仅物理化学技术已被用于减轻N_2O的点源，并且迄今为止尚未开发任何生物处理技术。在这项研究中，考虑使用具有自养反硝化生物阴极的生物电化学系统（BES）去除N_2O。获得的高N_2O去除率介于0.76到1.83 kg N m〜（-3）净阴极室（NCC）d''之间，并且与当前产量成正比，从而导致阴极库仑效率接近100％。此外，我们的实验表明微生物积极参与将N_2O还原为N_2的催化剂，最佳阴极电势范围为-200至0 mVvs标准氢电极（SHE），以获得高转化率。以N_2O作为唯一的阴极电子受体，该系统成功运行115天以上，强烈表明N_2O呼吸产生了足够的能量来维持生物过程。据我们所知，这项研究首次证明了长期去除生物阴极N_2O的概念，而无需高温和昂贵的催化剂。

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  • 来源
    《Environmental Science & Technology》 |2011年第24期|p.10557-10566|共10页
  • 作者

    Joachim Desloover; Sebastia Puig; Bernardino Virdis; Peter Clauwaert; Pascal Boeckx; Willy Verstraete; Nico Boon;

  • 作者单位

    Laboratory of Microbial Ecology and Technology (LabMET), Ghent University, Coupure Links 653, B-9000 Gent, Belgium;

    Laboratory of Chemical and Environmental Engineering (LEQUIA-UdG), Institute of the Environment, University of Girona, Campus Montilivi s, Facultat de Ciencies, E-17071 Girona, Spain;

    The University of Queensland, Advanced Water Management Centre, Level 4, Gehrmann Building (60), Brisbane, QLD 4072, Australia;

    Laboratory of Microbial Ecology and Technology (LabMET), Ghent University, Coupure Links 653, B-9000 Gent, Belgium;

    Laboratory of Applied Physical Chemistry (ISOFYS), Ghent University, Coupure Links 653,9000 Gent, Belgium;

    Laboratory of Microbial Ecology and Technology (LabMET), Ghent University, Coupure Links 653, B-9000 Gent, Belgium;

    Laboratory of Microbial Ecology and Technology (LabMET), Ghent University, Coupure Links 653, B-9000 Gent, Belgium;

  • 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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