Application of iron carbon in constructed wetlands with different structures: Integrated or separate type?
文献类型： 外文期刊
作者： Wang, Qinghua 1 ; Yang, Zhimin 1 ; Pu, Zhenbin 1 ; Cheng, Lei 1 ; Chen, Yucheng 1 ; Huang, Lei 1 ;
作者机构： 1.Southwest Univ, Coll Resources & 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
3.Chongqing Engn Res Ctr Rural Cleaner Prod, Chongqing 400716, Peoples R China
关键词： Constructed wetland; Greenhouse gas; Iron-carbon; Microbial community; Functional gene
期刊名称：JOURNAL OF WATER PROCESS ENGINEERING （ 影响因子：6.7； 五年影响因子：6.7 ）
ISSN： 2214-7144
年卷期： 2025 年 72 卷
页码：
收录情况： SCI
摘要： Iron-carbon materials were considered as valuable fillers for enhanced pollutant removal and greenhouse gas (GHG) reduction in constructed wetlands (CWs). However, the impact of structural changes in iron-carbon CWs on GHG emissions had received insufficient attention. In this study, the separation of the aerobic and anaerobic zones of the aerated constructed wetland improved the average ammonia nitrogen (NH4+-N) and total nitrogen (TN) removal rates by 30.26 % and 20.59 %, respectively. This measure increased the risk of nitrous oxide (N2O) emissions from the anaerobic zone; however, it significantly reduced emissions of methane (CH4) from the system, resulting in a 31.41 % reduction in total global warming potential (GWP). In addition, the separation of the aerobic and anaerobic zones increased iron autotrophic denitrifying bacteria and nitrifying bacteria genera and significantly affected the abundance of nirS, mcrA and pmoA functional gene. This study demonstrated that the split aeration constructed wetland was more favorable for iron-carbon enhanced pollutant removal and GWP reduction. Future research will focus more on the changes in greenhouse gas-related enzyme activities caused by structural changes in the iron-carbon system.
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