Biogas Emission from an Anaerobic Reactor
Biogas Emission from an Anaerobic Reactor
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DOI：
10.4209/aaqr.2018.05.0169
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发表时间：
2018
影响因子：
4
通讯作者：
Yu-Bo Zhang;Yulong Wang;Wei-hua Li;Lijun Bao;Li-Han Wang;Xian-huai Huang;Bo Huang
中科院分区：
文献类型：
--
作者：
Yu-Bo Zhang;Yulong Wang;Wei-hua Li;Lijun Bao;Li-Han Wang;Xian-huai Huang;Bo Huang
厌氧反硝化伴随着沼气排放，这可能导致温室气体或空气污染物。亚铁在废水处理中起着重要的作用。然而，亚铁离子对沼气排放的影响以及微生物群落与脱氮性能之间的关系尚未完全了解，特别是在升流式厌氧污泥床（UASB）反应器中。在此，结果显示，氮气随着Fe（II）的添加而迅速增加。亚铁离子对反硝化和COD去除率的提高分别达到60%和10%以上。此外，在整个UASB反应器运行过程中，亚铁离子的投加明显增加了噬氢菌、甲烯菌、动胶菌和河生菌的数量。相关系数分析进一步证实了Fe（II）与噬氢菌属、甲藻属和河生菌属的丰度呈正相关。基于化学物质转化动力学、微生物群落和相关系数分析的结果，提出了一种假设的机理：在含Fe（II）和NH 4+的UASB系统中，首先是沼杆菌参与NH 4+的氧化，产生NO3-，其次是噬氢菌参与NO3-的还原，动胶菌参与NO3-还原与Fe（II）氧化的耦合，Fluviicola与Methylotenera组合进行NO2-还原和Fe（II）氧化。本研究将加深我们对亚铁离子对沼气排放、反硝化过程及相应微生物群落的影响的认识。
Anaerobic denitrification is accompanied by biogas emissions, which may orient greenhouse gases or air pollutants. Ferrous iron play an important role in wastewater treatment. However, the effect of ferrous ion on biogas emission and the relationship between microbial community and nitrogen removal performance are not fully understood, especially in up-flow anaerobic sludge blanket (UASB) reactors. Here, the results revealed that nitrogen gas increased rapidly with Fe(II) addition. And ferrous ions enhanced denitrification and COD removal efficiency with more than 60% and 10%, respectively. Moreover, Ferrous ions addition evidently increased Hydrogenophaga, Methylotenera, Zoogloea and Fluviicola during the whole UASB reactor operation progress. The correlation coefficient analysis further confirmed that Fe(II) was positively correlated with the abundances of Hydrogenophaga, Methylotenera and Fluviicola. Based on these results of chemicals transformation kinetics, microbial community and the correlations coefficient analysis, a hypothetical mechanism is proposed: In the UASB system with Fe(II) and NH4+, firstly Paludibacter made a contribution to NH4+ oxidation and generated NO3–, and then Hydrogenophaga, played an important role in NO3– reduction, Zoogloea coupled NO3– reduction to Fe(II) oxidation, Fluviicola combined with Methylotenera conducted NO2– reduction together with Fe(II) oxidation. This study will improve our understanding of ferrous ion’s influence on biogas emission, denitrification process and corresponding microbial community.