Metagenomic analysis of the inhibitory effect of chromium on microbial communities and removal efficiency in A2O sludge.
Metagenomic analysis of the inhibitory effect of chromium on microbial communities and removal efficiency in A2O sludge.
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DOI：
10.1016/j.jhazmat.2019.01.076
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发表时间：
2019-04
影响因子：
13.6
通讯作者：
F. Sun;Leilei Fan;You-Shao Wang;Li-yan Huang
中科院分区：
文献类型：
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作者：
F. Sun;Leilei Fan;You-Shao Wang;Li-yan Huang
这是第一项研究探索持久性Cr（VI）处理对微生物群落和功能以及A2O系统的工艺效率的影响。高Cr（VI）浓度下的抑制效果明显高于低Cr（VI）浓度，不同Cr（VI）浓度对系统的微生物群落和运行效率有不同的影响。功能注释分析表明，Cr（VI）胁迫抑制了大部分微生物群落的代谢途径和功能基因，尤其是反硝化途径相关基因。利用网络分析法研究了反硝化基因与微生物类群之间的共生模式，结果表明，具有功能基因的微生物具有较高的多样性，且受到Cr（VI）暴露的不利影响。本研究首次建立了Cr（VI）胁迫与微生物群落和功能之间的关系，并确定了Cr（VI）在A2O污泥中的潜在机制和作用。
This is the first study exploring the effects of persistent Cr(VI) treatment on microbial communities and function as well as the process efficiency of an A2O system. The inhibitory effect was clearly higher at a high Cr(VI) concentration than a low Cr(VI) concentration, and different Cr(VI) concentrations had distinct effects on the microbial communities as well as on the performance efficiency of the system. Functional annotation analysis indicated that Cr(VI) stress inhibited most of the metabolic pathway and functional genes of the microbial communities, especially those involved in the denitrification pathway. Network analysis was used to investigate the co-occurrence patterns between denitrification genes and microbial taxa; the results indicated that microorganisms with functional genes had high diversity and were adversely affected by Cr(VI) exposure. This study is the first to establish a relationship between Cr(VI) stress and microbial communities and function as well as to determine the underlying mechanisms and roles of Cr(VI) in A2O sludge.