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Methanobacterium enables high rate electricitydriven autotrophic sulfate reduction

机译：甲基杆菌能够降低高速率电能自养硫酸盐

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The autotrophic reduction of sulfate can be sustained with a cathode as the only electron donor in bioelectrochemical systems (BES). This work studies the effect of inoculum source on autotrophic sulfate reduction start-up and performance of autotrophic sulfide production rates using a biocathode in a fed-batch operation mode. After 180 days, low electron and sulfate consumption was observed using BES controlled at ~0.9 V vs. SHE and inoculated with mixed microbial consortia from sewer biofilm reactors, anaerobic sludge and mangrove sediments. However, when an enriched electroactive consortium capable of cathodic CO2 reduction to acetate was used as biocatalyst in combination with the above inocula, the maximal cathodic current increased to-3.4 A m~(-2) within 55 days at the same applied potential. High-throughput microbial community sequencing revealed that enhanced performance was likely caused by the enrichment of hydrogen-producing Methanobacterium (26% relative abundance). The biofilm and planktonic cells also contained the autotrophic hydrogen and sulfate consumer Desulfovibrio at 2.8% relative abundance. The resulting microbial community demonstrated sulfate and electron consumption rates of 0.115 X 0.009 mol SO4 2~-S per m2 per d and1.5 X 0.7 mol m~(-2) d~1 39 times higher sulfate reduction rate and 186-fold cathodic electron consumption rate than control reactors with the same configuration but lacking the enriched electroactive consortia). Cyclic voltammetry furthermore revealed a positive shift of the cathodic onset current by ~0.2 V, which points to the electrocatalytic role of the biocatalyst.
机译：硫酸盐的自抗营养还原可以用阴极持续作为生物电化学系统（BES）中唯一的电子供体。这项工作研究了接种源对进料批量操作模式中的生物液体的自养硫酸盐降低启动和性能的自养硫酸盐生产率的影响。在180天后，使用BES控制在〜0.9V与〜0.9V的〜0.9 Vs中观察到低电子和硫酸盐。用来自下水道生物膜反应器，厌氧污泥和红树林沉积物接种的混合微生物混合。然而，当能够与上述接种物组合使用富含阴极二氧化碳的富含阴极二氧化碳的电活性聚集酸盐作为生物催化剂时，在相同的应用潜力的55天内，最大阴极电流在55天内增加至3.4A m〜（-2）。高通量微生物群落测序揭示了增强的性能可能是由产生氢气溶液（相对丰度26％）的富集引起的。生物膜和浮游细胞还含有自养氢和硫酸盐消费者脱硫在2.8％相对丰度。所得的微生物群落显示硫酸盐和电子消耗率为0.115×0.009mol SO4 2〜-S /每D和1.5×0.7mol m〜（-2）d〜1 39倍，硫酸盐还原率高和186倍的阴极电子消耗率比具有相同配置但缺乏富含富集的电活性组成的反应器。循环伏安进一步揭示了阴极发作电流的正偏移〜0.2V，这指向生物催化剂的电催化作用。

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  • 来源
    《RSC Advances》 |2015年第109期|共7页
  • 作者

    Guillermo Pozo; Ludovic Jourdin; Yang Lu;

  • 作者单位

    Advanced Water Management Centre The University of Queensland St. Lucia QLD 4072 Australia.;

    Advanced Water Management Centre The University of Queensland St. Lucia QLD 4072 Australia.;

    Advanced Water Management Centre The University of Queensland St. Lucia QLD 4072 Australia.;

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  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类 化学;
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