Effect of Ferrous Iron Addition on Ammonium Nitrogen Removal and Microbial Communities in Horizontal Subsurface Flow Constructed Wetlands

文献类型： 外文期刊

第一作者： Zhang, Yan

作者： Zhang, Yan;Fu, Chunyan;Wu, Jiaqiang;Shi, Tianhong;Liu, Xuelan;Li, Xinhua;Dong, Hongyun;Yan, Baixing

作者机构：

关键词： Ferric iron; Constructed wetlands; Nitrogen removal; C; N ratios; Hydraulic retention time

期刊名称：WETLANDS （ 影响因子：2.204； 五年影响因子：2.653 ）

ISSN： 0277-5212

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收录情况： SCI

摘要： This study explored the influence of ferrous iron (Fe2+) addition on ammonium nitrogen (NH4-N) removal and microbial communities in horizontal subsurface flow constructed wetlands (HSSFs) at different carbon/nitrogen (C/N) ratios. Fe(2+)addition could improve NH4-N removal under the C/N ratio of 2.1 and alter the microbial community structure. The microbial diversity and functional genes at the C/N ratio of 2.1 were enhanced by the addition of 50 mg/L Fe2+, with the increases observed in NH4-N and total nitrogen (TN) removal. This indicates the enhancement of nitrogen removal by Fe(2+)addition with the presence of high organic matter. However, the enhancement of Fe(2+)on chemical oxygen demand removal was not obvious overall. The relative abundance of functional genes and those related to energy metabolism, xenobiotic biodegradation, and metabolism decreased significantly in HSSFs with Fe(2+)at C/N ratio of 1.1, whereas they increased in HSSFs with the addition of 50 mg/L Fe(2+)at C/N ratio of 2.1.

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