Magnetite nanoparticles enhance the performance of a combined bioelectrode-UASB reactor for reductive transformation of 2,4-dichloronitrobenzene.
Magnetite nanoparticles enhance the performance of a combined bioelectrode-UASB reactor for reductive transformation of 2,4-dichloronitrobenzene.
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磁铁矿纳米粒子增强了组合生物电极-UASB反应器用于2,4-二氯硝基苯还原转化的性能
DOI：
10.1038/s41598-017-10572-y
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发表时间：
2017-09-04
影响因子：
4.6
通讯作者：
Zhu L
中科院分区：
文献类型：
--
作者：
Wang C;Ye L;Jin J;Chen H;Xu X;Zhu L
彗星微生物之间的直接种间电子传递（DIET）对持久性有机污染物的厌氧降解和厌氧生物反应器的稳定性起着关键作用。在本研究中，COD去除率提高到99.0%，在组合生物电极-UASB系统（R1）与磁铁矿纳米粒子的添加，这是高于耦合生物电极-UASB（R2; 83.2%）和常规UASB（R3; 71.0%）在启动阶段。在稳定阶段，2，4-二氯硝基苯（2，4-DClNB）浓度从25 mg L−1增加到200 mg L−1，对R1和R2的COD去除率没有影响，而对R3的COD去除率有明显的影响。进一步的中间体分析表明，纳米磁铁矿颗粒增强了2，4-DClNB的还原脱氯。高通量测序结果表明，在R1反应器阴极表面上存在优势的功能微生物，如互养菌属和互养单胞菌属，它们已被报道为有利于DIET。推测在生物电极-UASB组合反应器中，纳米磁铁矿的加入有利于脱氯微生物和产电菌的协同代谢.该研究为改善微生物电解槽的性能、提高污染物去除效率提供了新的思路。
Direct interspecies electron transfer (DIET) among the cometabolism microbes plays a key role in the anaerobic degradation of persistent organic pollutants and stability of anaerobic bioreactor. In this study, the COD removal efficiency increased to 99.0% during the start-up stage in the combined bioelectrode-UASB system (R1) with magnetite nanoparticles addition, which was higher than those in the coupled bioelectrode-UASB (R2; 83.2%) and regular UASB (R3; 71.0%). During the stable stage, the increase of 2,4-dichloronitrobenzene (2,4-DClNB) concentration from 25 mg L−1 to 200 mg L−1 did not affect the COD removal efficiencies in R1 and R2, whereas the performance of R3 was deteriorated obviously. Further intermediates analysis indicated that magnetite nanoparticles enhanced the reductive dechlorination of 2,4-DClNB. High-throughput sequencing results showed that the functional microbes like Syntrophobacter and Syntrophomonas which have been reported to favor the DIET, were predominant on the cathode surface of R1 reactor. It is speculated that the addition of magnetite nanoparticles favors the cooperative metabolism of dechlorinating microbes and electricigens during 2,4-DClNB degradation process in the combined bioelectrode-UASB reactor. This study may provide a new strategy to improve the performance of microbial electrolysis cells and enhance the pollutant removal efficiency.
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