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Interactive effect of carbon source with influent COD/N on nitrogen removal and microbial community structure in subsurface flow constructed wetlands

文献类型： 外文期刊

作者： Huang, Lei 1 ; Wang, Ning 1 ; Deng, Chaoren 1 ; Liang, Yinkun 1 ; Wang, Qinghua 1 ; Liu, Maolin 1 ; Chen, Yucheng 1 ;

作者机构： 1.Southwest Univ, Coll Resource & Environm, Key Lab Three Gorges Reservoir Reg Ecoenvironm, Minist Educ, Chongqing 400715, Peoples R China

2.Chongqing Key Lab Agr Resources & Environm, Chongqing 400716, Peoples R China

关键词： Constructed wetland; Carbon source; Influent COD/N ratio; Interactive effect; Nitrogen removal; Phospholipid fatty acid; Bacteria and fungi

期刊名称：JOURNAL OF ENVIRONMENTAL MANAGEMENT （ 影响因子：8.0； 五年影响因子：7.9 ）

ISSN： 0301-4797

年卷期： 2019 年 250 卷

页码：

收录情况： SCI

摘要： Carbon source and influent COD/N (chemical oxygen demand: total nitrogen) pose distinct effects on nitrogen removal efficiency and microbial community structure of constructed wetlands. To investigate the interactive effect of carbon source with COD/N on nitrogen removal and microbial community structure in subsurface flow constructed wetlands, glucose (C6H12O6) and sodium acetate (C2H3NaO2) were used to determine five COD/N ratios in nine groups of constructed wetlands divided into glucose constructed wetlands and sodium acetate constructed wetlands. Results showed that efficiency in COD removal increased with COD/N, and peak value reached 92.7%. Interactive effect of carbon source with COD/N on system pH and ammonium removal was notably significant. Differences in ammonium removal performance between treatments were achieved by the variation of influent COD/N ratio and the change of system pH resulted from different carbon sources, and the result suggested that glucose was a better choice at high COD/N ratio. System microbial community structure was significantly affected by carbon source, influent COD/N ratio and their interaction. Microbial biomass in constructed wetlands significantly increased with increasing COD/N ratio. Higher density and diversity of fungus were observed in glucose constructed wetlands, particularly at COD/N ratio of 7 and 10.

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