Bioenergy generation and degradation pathway of phenanthrene and anthracene in a constructed wetland-microbial fuel cell with an anode amended with nZVI
Bioenergy generation and degradation pathway of phenanthrene and anthracene in a constructed wetland-microbial fuel cell with an anode amended with nZVI
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带有 nZVI 修饰阳极的人工湿地微生物燃料电池中菲和蒽的生物能产生和降解途径
DOI：
10.1016/j.watres.2018.11.075
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发表时间：
2019
期刊：
影响因子：
12.8
通讯作者：
Bai Junhong
中科院分区：
文献类型：
--
作者：
Wang Junfeng;Song Xinshan;Li Qusheng;Bai Heng;Zhu Congyun;Weng Baisha;Yan Denghua;Bai Junhong
多环芳烃(PAHs)因其对动植物和人类的致畸、毒性、致癌性和致突变性而在水环境中频繁出现，引起人们的极大关注。在人工湿地-微生物燃料电池(CW-MFC)中，研究了添加和不添加生物炭-nZVI的阳极电极对菲和菲的生物发电、生物降解、植物提取和底物吸附。在182天的运行周期中，菲和菲的平均去除效率在88.5%~96.4%之间。根、茎和叶片中菲的含量分别为14.9、3.9和2.3 ng g−1，而菲的含量分别为2 2.2、3.1和1.3 ng g−1。此外，nZVI的应用有利于CW-MFC反应器的生物发电和有机物降解。细菌群落的分布表明，具有降解难降解有机物能力的芽孢杆菌、棕榈杆菌、硫弧菌和乳球菌的相对丰度显著增加。尤其是分泌过氧化氢酶的芽孢杆菌属变得更加丰富。我们的研究结果表明，如何通过改善细菌的培养条件来促进CW-MFC中难降解有机物的生物发电和生物降解。
The frequent occurrence of polycyclic aromatic hydrocarbons (PAHs) in aquatic environments is of great concern because of their teratogenicity, toxicity, carcinogenicity, and mutagenicity to plants, animals and human beings. In this study the bioelectricity generation, biodegradation, phytoextraction and substrate adsorption of phenanthrene and anthracene in a constructed wetland-microbial fuel cell (CW-MFC) were investigated with an anode electrode amended with or without biochar-nZVI. During a 182-day operation period, the average removal efficiency for phenanthrene and anthracene ranged from 88.5% to 96.4%. The concentration of phenanthrene in roots, stems and laminas ofT. orientaliswas 14.9, 3.9 and 2.3 ng g−1respectively, while that of anthracene was 22.2, 3.1 and 1.3 ng g−1, respectively. In addition, the application of nZVI was conducive to bioelectricity generation and organic compound degradation in the CW-MFC reactor. The distribution of the bacterial community indicated that the relative abundance ofBacillus,Paludibacter,DesulfovibrioandLactococcuswith a degradation capability for refractory organics was significantly increased. Especially the genusBacillusfor excreting catalase became more abundant. The results of our study indicate how to promote bioelectricity generation and biodegradation of refractory organic compounds in a CW-MFC by improving the culture conditions for bacteria.