Using rice straw-augmented ecological floating beds to enhance nitrogen removal in carbon-limited wastewater
文献类型： 外文期刊
作者： Cai, Xixi 1 ; Li, Jianying 1 ; Wu, Haoping 1 ; Yang, Siyu 1 ; You, Yi 1 ; Li, Dunhai 3 ; Xing, Wei 4 ; Zou, Chunping 1 ; Guo, Xiaoyu 5 ; Li, Jibing 6 ; Qin, Hongjie 1 ;
作者机构： 1.Guangdong Acad Agr Sci, Environm Hort Res Inst, Guangdong Key Lab Ornamental Plant Germplasm Innov, Guangzhou 510640, Peoples R China
2.Minist Agr & Rural Affairs, Key Lab Urban Agr South China, Guangzhou 510640, Peoples R China
3.Chinese Acad Sci, Inst Hydrobiol, Key Lab Algal Biol, Wuhan 430072, Peoples R China
4.Chinese Acad Sci, Key Lab Aquat Bot & Watershed Ecol, Wuhan Bot Garden, Wuhan 430074, Peoples R China
5.Hainan Univ, Key Lab Environm Toxicol, Haikou 570228, Peoples R China
6.Chinese Acad Sci, Guangzhou Inst Geochem, State Key Lab Organ Geochem, Guangzhou 510640, Peoples R China
7.Chinese Acad Sci, Guangzhou Inst Geochem, Guangdong Hong Kong Macao Joint Lab Environm Pollu, Guangzhou 510640, Peoples R China
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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