Impact of operating condition on the denitrifying bacterial community structure in a 3DBER-SAD reactor

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• 作者：Ruixia Hao ; Chengcheng Meng ; Jianbing Li
• 关键词：Denitrifying bacteria community ; nirS gene ; Sulfur autotrophic denitrification ; Three ; dimensional biofilm ; electrode reactor ; Wastewater denitrification
• 刊名：Journal of Industrial Microbiology & Biotechnology
• 出版年：2017
• 出版时间：January 2017
• 年：2017
• 卷：44
• 期：1
• 页码：9-21
• 全文大小：
• 刊物类别：Biomedical and Life Sciences
• 刊物主题：Microbiology; Biochemistry, general; Inorganic Chemistry; Genetic Engineering; Biotechnology; Bioinformatics;
• 出版者：Springer Berlin Heidelberg
• ISSN：1476-5535
• 卷排序：44

文摘

Two main operating parameters (influent C/N ratio and electric current intensity) were examined for their impacts on the denitrifying bacterial community structure in an integrated system of three-dimensional biofilm-electrode reactor and sulfur autotrophic denitrification (3DBER-SAD). It was found that genus β-proteobacteria played a leading role under different operating conditions. The influent C/N ratio illustrated a great impact on denitrifying bacteria diversity. When the C/N ratio decreased from 1.07 to 0.36, the Shannon–Wiener index and Simpson index increased from 2.44 to 2.71 and from 0.89 to 0.92, respectively, while the proportion of heterotrophic denitrifying bacteria Thauera decreased from 61.4 to 21.1%, and the sulfur autotrophic denitrifying bacteria (e.g., genus Sulfuricella and Thiobacillus denitrificans) increased from 3.5 to 19.3%. In terms of the impact of electric current intensity, the Shannon–Wiener index and Simpson index decreased from 2.71 to 2.63 and from 0.92 to 0.90, respectively, as the current intensity increased from 60 to 400 mA.