气候变化领域集成服务门户(CCPortal): Impact of influent strengths on nitrous oxide emission and its molecular mechanism in constructed wetlands treating swine wastewater

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DOI	10.1016/j.envres.2022.112957
	Impact of influent strengths on nitrous oxide emission and its molecular mechanism in constructed wetlands treating swine wastewater
	Sun, Haishu; Wu, Shanghua; Feng, Shugeng; Jiang, Cancan; Wang, Rui; Xu, Shengjun; Cui, Lijuan; Zhuang, Xuliang
通讯作者	Zhuang, XL (通讯作者)
发表日期	2022
ISSN	0013-9351
EISSN	1096-0953
卷号	210
英文摘要	Constructed wetlands (CWs) can remove nitrogen (N) through plant assimilation and microbial nitrification and denitrification, while it also releases large greenhouse gas nitrous oxide (N2O) into the atmosphere. However, N2O emissions and the underlying microbial mechanisms of CWs when treating high-strength wastewater have not been systematically surveyed. Here, the effect of three influent strengths on N2O emissions in a pilot-scale CW treatment of swine wastewater was determined and the underlying microbial mechanisms were explored. The results showed that the removal rates of ammonium (NH4+) and total nitrogen (TN) increased significantly with the increasing influent strengths, however, the ratio of N2O emission/TN removal rose by 1.5 times at the same time. Quantitation of microorganisms responsible for N-cycle in the sediment indicated that the abundance of ammonia-oxidizing bacteria (AOB) in high influent strengths (COD, 962.38 +/- 3.05 mg/L; NH4+, 317.89 +/- 4.24 mg/L) was 51.6-fold compared with that in low influent strengths (COD, 516.94 +/- 4.18 mg/L; NH4+, 100.65 +/- 2.65), and AOB gradually replaced ammonia-oxidizing archaea (AOA) to dominate ammonia oxidizers. Structural equation models demonstrated that NO2- accumulations promoted the ratio of AOB/AOA, which further led to an increase in the ratio of N2O emission/TN removal. It is worth noting both the N removal rates and N2O emissions increased with the increasing influent strength. To obtain reduced N2O emissions, pretreatment technology for strength reduction should be supplemented before high-strength wastewater enters the CWs. This study may shed new light on the sustainable operation and application of CWs.
关键词	MICROBIAL COMMUNITIES ACTIVATED-SLUDGE N2O PRODUCTION FLOW REMOVAL OXYGEN BACTERIAL PLANTS
英文关键词	Constructed wetland; N2O emission; Influent strengths; Swine wastewater; Microbial mechanisms
语种	英语
WOS研究方向	Environmental Sciences & Ecology ; Public, Environmental & Occupational Health
WOS类目	Environmental Sciences ; Public, Environmental & Occupational Health
WOS记录号	WOS:000772058400006
来源期刊	ENVIRONMENTAL RESEARCH
来源机构	中国科学院青藏高原研究所
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/260675
推荐引用方式 GB/T 7714	Sun, Haishu,Wu, Shanghua,Feng, Shugeng,et al. Impact of influent strengths on nitrous oxide emission and its molecular mechanism in constructed wetlands treating swine wastewater[J]. 中国科学院青藏高原研究所,2022,210.
APA	Sun, Haishu.,Wu, Shanghua.,Feng, Shugeng.,Jiang, Cancan.,Wang, Rui.,...&Zhuang, Xuliang.(2022).Impact of influent strengths on nitrous oxide emission and its molecular mechanism in constructed wetlands treating swine wastewater.ENVIRONMENTAL RESEARCH,210.
MLA	Sun, Haishu,et al."Impact of influent strengths on nitrous oxide emission and its molecular mechanism in constructed wetlands treating swine wastewater".ENVIRONMENTAL RESEARCH 210(2022).