Using rice straw-augmented ecological floating beds to enhance nitrogen removal in carbon-limited wastewater

文献类型： 外文期刊

第一作者： Cai, Xixi

作者： Cai, Xixi;Li, Jianying;Wu, Haoping;Yang, Siyu;You, Yi;Zou, Chunping;Qin, Hongjie;Cai, Xixi;Li, Jianying;Wu, Haoping;Yang, Siyu;You, Yi;Zou, Chunping;Qin, Hongjie;Li, Dunhai;Xing, Wei;Guo, Xiaoyu;Li, Jibing;Li, Jibing

作者机构：

关键词： Microbial community; Denitrification; Low -carbon sewage; Aquatic macrophytes

期刊名称：BIORESOURCE TECHNOLOGY （ 影响因子：11.4； 五年影响因子：10.6 ）

ISSN： 0960-8524

年卷期： 2024 年 402 卷

页码：

收录情况： SCI

摘要： Agricultural biomass used as solid carbon substrates in ecological floating beds (EFBs) has been proven to be applicable in nitrogen removal for carbon-limited wastewater treatment. However, the subtle interactions among plants, rhizosphere microorganisms, and supplementary carbon sources have not been thoroughly studied. This study combined rice straw mats with different aquatic macrophytes in EFBs to investigate denitrification efficiency in carbon-limited eutrophic waters. Results showed that rice straw significantly enhanced the nitrogen removal efficiency of EFBs, while enriching nitrogen-fixing and denitrifying bacteria (such as Rhizobium, Rubrivivax, and Rhodobacter, etc.). Additionally, during the denitrification process in EFBs, rice straw can release humic acid-like fraction as electron donors to support the metabolic activities of microorganisms, while aquatic macrophytes provide a more diverse range of dissolved organic matters, facilitating a sustainable denitrification process. These findings help to understand the synergistic effect of denitrification processes within wetland ecosystems using agricultural biomass.

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