Understanding of mercury and methylmercury transformation in sludge composting by metagenomic analysis
文献类型：期刊论文
| 作者 | Liu, Jibao ; Bao, Zhen; Wang, Chenlu; Wei, Jinyi; Wei, Yuansong; Chen, Meixue
|
| 刊名 | WATER RESEARCH
 |
| 出版日期 | 2022 |
| 卷号 | 226页码:119204-1-12 |
| 关键词 | Sewage sludge Composting Methylmercury Metagenomic analysis |
| ISSN号 | 0043-1354 |
| 英文摘要 | Municipal sewage especially the produced sewage sludge is a significant source releasing mercury (Hg) to the environment. However, the Hg speciation especially methylmercury (MeHg) transformation in sewage sludge treatment process remains poorly understood. This study investigated the transformation of Hg speciation especially MeHg in sludge composting. The distribution of Hg transformation related gene pairs hgcAB and merAB, and their putative microbial hosts were comprehensively analyzed. Both Hg (from 3.16 +/- 0.22 mg/kg to 3.20 +/- 0.19 mg/kg) and MeHg content (from 4.77 +/- 0.64 ng/g to 4.36 +/- 0.37 ng/g) were not obviously changed before and after composting, but about 19.69% of Hg and 27.36% of MeHg were lost according to mass balance calculation. The metagenomic analysis further revealed that anaerobes (Desulfobacterota and Euryarchaeota) were the mainly putative Hg methylators especially carrying high abundance of hgcA gene in the initial periods of composting. Among the 151 reconstructed metagenome-assembled genomes (MAGs), only 4 hgcA gene carriers (Myxococcota, Firmicutes, Cyclobacteriaceae, and Methanothermobacter) and 16 merB gene carriers were identified. But almost all of the MAGs carried hgcB gene and merA gene. The merA gene was widely distributed in genomes, which indicated the widespread functionality of microbes for reducing Hg(II) to Hg(0). The hgcA carrying mi-crobes tends to present the similar metabolic pathways including methanogenesis and sulfur metabolism. Be-sides, both the irregular distribution of hgcA in various species (including Actinobacteria, Archaea, Bacteroidetes, Desulfobacterota, Euryarchaeota, and Nitrospirae, etc.) and opposite evolution trends between hgcA gene abun-dance and its host genome abundance can be an indication of horizontal gene transfer or gene deletions of hgcA during composting. Our findings thus revealed that sludge composting is not only a hotspot for Hg speciation transformation, but also a potential hotspot for MeHg transformation. |
| 源URL | [https://ir.rcees.ac.cn/handle/311016/48465]  |
| 专题 | 生态环境研究中心_大气污染控制中心 |
| 作者单位 | 1.Research Center for Eco-Environmental Sciences (RCEES) 2.University of Chinese Academy of Sciences, CAS 3.Chinese Academy of Sciences |
| 推荐引用方式 GB/T 7714 | Liu, Jibao,Bao, Zhen,Wang, Chenlu,et al. Understanding of mercury and methylmercury transformation in sludge composting by metagenomic analysis[J]. WATER RESEARCH,2022,226:119204-1-12. |
| APA | Liu, Jibao,Bao, Zhen,Wang, Chenlu,Wei, Jinyi,Wei, Yuansong,&Chen, Meixue.(2022).Understanding of mercury and methylmercury transformation in sludge composting by metagenomic analysis.WATER RESEARCH,226,119204-1-12. |
| MLA | Liu, Jibao,et al."Understanding of mercury and methylmercury transformation in sludge composting by metagenomic analysis".WATER RESEARCH 226(2022):119204-1-12. |
入库方式： OAI收割
来源：生态环境研究中心
浏览0
下载0
收藏0
其他版本
除非特别说明，本系统中所有内容都受版权保护，并保留所有权利。