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首页> 外文期刊>Environmental Science & Technology >Nitrate Shaped the Selenate-Reducing Microbial Community in a Hydrogen-Based Biofilm Reactor
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Nitrate Shaped the Selenate-Reducing Microbial Community in a Hydrogen-Based Biofilm Reactor

机译：硝酸盐塑造基于氢的生物膜反应器中的减少硒酸盐的微生物群落

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摘要

To study the effect of nitrate (NO_3~-) on selenate (SeO_4~(2-)) reduction, we tested a H_2-based biofilm with a range of influent NO_3~- loadings. When SeO_4~(2-) was the only electron acceptor (stage 1), 4096 of the influent SeO_4~(2-) was reduced to insoluble elemental selenium (Se ). SeO_4~(2-) reduction was dramatically inhibited when NO_3~- was added at a surface loading larger than 1.14 g of N m~(-2) day~(-1), when H_2 delivery became limiting and only 80% of the input NO_3~- was reduced (stage 2). In stage 3, when NO_3~- was again removed from the influent, SeO_4~(2-) reduction was re-established and increased to 60% conversion to Se~0. SeO_4~(2-) reduction remained stable at 60% in stages 4 and 5, when the NO_3~- surface loading was re-introduced at ≤0.53 g of N m~(-2) day~(-1), allowing for complete NO_3~- reduction. The selenate- reducing microbial community was significantly reshaped by the high NO_3~- surface loading in stage 2, and it remained stable through stages 3-5. In particular, the abundance of a-Proteobarteria decreased from 30% in stage 1 to less than 10% of total bacteria in stage 2. β-Proteobacteria, which represented about 55% of total bacteria in the biofilm in stage 1, increased to more than 90% of phylotypes in stage 2. Hydrogenophaga, an autotrophic denitrifier, was positively correlated with NO_3~- flux. Thus, introducing a NO_3~- loading high enough to cause H_2 limitation and suppress SeO_4~(2-) reduction had a long-lasting effect on the microbial community structure, which was confirmed by principal coordinate analysis, although SeO_4~(2-) reduction remained intact.
机译：为了研究硝酸盐（NO_3〜-）对硒酸盐（SeO_4〜（2-））还原的影响，我们测试了H_2基生物膜的进水NO_3〜-负载量。当SeO_4〜（2-）是唯一的电子受体时（阶段1），将4096种流入的SeO_4〜（2-）还原为不溶性元素硒（Se）。当表面负荷大于1.14 g N m〜（-2）天〜（-1）时，添加NO_3〜-会显着抑制SeO_4〜（2-）的还原，而当H_2的输送变得受限时，只有80％的H_2被释放。输入NO_3〜-减少（阶段2）。在阶段3中，当再次从进水中去除NO_3〜-时，SeO_4〜（2-）还原重新建立，并增加到60％转化为Se〜0。当在≤0.53 g N m〜（-2）天〜（-1）时重新引入NO_3〜-表面负载时，SeO_4〜（2-）的还原在第4和第5阶段保持稳定在60％。完成NO_3〜-还原。减少硒酸盐的微生物群落在第2阶段被高NO_3〜-表面负荷所重塑，并在第3-5阶段保持稳定。特别是，a-Proteobarteria的丰度从第1阶段的30％减少到第2阶段的细菌总数的不到10％。β-Proteobacteria占第1阶段生物膜中细菌总数的55％，增加到更多。在第二阶段中，有超过90％的系统型。自养反硝化菌Hydrogenophaga与NO_3〜-通量呈正相关。因此，尽管SeO_4〜（2-）尽管引入了足够高的NO_3〜-含量以引起H_2限制并抑制SeO_4〜（2-）的还原对微生物群落结构产生了长久的影响，但通过主坐标分析证实了这一点。减少量保持不变。

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  • 来源
    《Environmental Science & Technology》 |2014年第6期|3395-3402|共8页
  • 作者

    Chun-Yu Lai; Xiaoe Yang; Youneng Tang; Bruce E. Rittmann; He-Ping Zhao;

  • 作者单位

    Ministry of Education, Key Laboratory of Environmental Remediation and Ecosystem Health, College of Environmental and Resource Science, Zhejiang University, Hangzhou 310029, People's Republic of China;

    Ministry of Education, Key Laboratory of Environmental Remediation and Ecosystem Health, College of Environmental and Resource Science, Zhejiang University, Hangzhou 310029, People's Republic of China;

    Department of Civil and Environmental Engineering, University of Illinois at Urbana-Champaign, Urbana, Illinois 61801, United States;

    Swette Center for Environmental Biotechnology, Biodesign Institute, Arizona State University, Post Office Box 875701, Tempe, Arizona 85287-5701, United States;

    Ministry of Education, Key Laboratory of Environmental Remediation and Ecosystem Health, College of Environmental and Resource Science, Zhejiang University, Hangzhou 310029, People's Republic of China;

  • 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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