气候变化领域集成服务门户(CCPortal): Impact of aerobic granular sludge sizes and dissolved oxygen concentration on greenhouse gas N2O emission

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DOI	10.1016/j.watres.2024.121479
	Impact of aerobic granular sludge sizes and dissolved oxygen concentration on greenhouse gas N2O emission
	Quoc, Bao Nguyen; Cavanaugh, Shannon K.; Hunt, Kristopher A.; Bryson, Samuel J.; Winkler, Mari K. H.
发表日期	2024
ISSN	0043-1354
EISSN	1879-2448
起始页码	255
卷号	255
英文摘要	Aerobic granular sludge (AGS) at wastewater treatment plants (WWTPs) are known to produce nitrous oxide (N2O), a greenhouse gas which has a similar to 300 times higher global warming potential than carbon dioxide. In this research, we studied N2O emissions from different sizes of AGS developed at a dissolved oxygen (DO) level of 2 mgO(2)/L while exposing them to disturbances at various DO concentrations ranging from 1 to 4 mgO(2)/L. Five different AGS size classes were studied: 212-600 mu m, 600-1000 mu m, 1000-1400 mu m, 1400-2000 mu m, and > 2000 mu m. Metagenomic data showed N2O reductase genes (nosZ) were more abundant in the smaller AGS sizes which aligned with the observation of higher N2O reduction rates in small AGS under anaerobic conditions. However, when oxygen was present, the activity measurements of N2O emission showed an opposite trend compared to metagenomic data, smaller AGS (212 to 1000 mu m) emitted significantly higher N2O(p < 0.05) than larger AGS (1000 mu m to >2000 mu m) at DO of 2, 3, and 4 mgO(2)/L. The N2O emission rate showed positive correlation with both oxygen levels and nitrification rate. This pattern indicates a connection between N2O emission and nitrification. In addition, the data suggested the penetration of oxygen into the anoxic zone of granules might have hindered nitrous oxide reduction, resulting in incomplete denitrification stopping at N2O and consequently contributing to an increase in N2O emissions. This work sets the stage to better understand the impacts of AGS size on N2O emissions in WWTPs under different disturbance of DO conditions, and thus ensure that wastewater treatment will comply with possible future regulations demanding lowering greenhouse gas emissions in an effort to combat climate change.
英文关键词	Aerobic granular sludge; N2O gas emission; Aggregate size fraction; Dissolved oxygen concentration; Wastewater treatment; Denitrification
语种	英语
WOS研究方向	Engineering ; Environmental Sciences & Ecology ; Water Resources
WOS类目	Engineering, Environmental ; Environmental Sciences ; Water Resources
WOS记录号	WOS:001218938600001
来源期刊	WATER RESEARCH
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/302758
作者单位	University of Washington; University of Washington Seattle
推荐引用方式 GB/T 7714	Quoc, Bao Nguyen,Cavanaugh, Shannon K.,Hunt, Kristopher A.,et al. Impact of aerobic granular sludge sizes and dissolved oxygen concentration on greenhouse gas N2O emission[J],2024,255.
APA	Quoc, Bao Nguyen,Cavanaugh, Shannon K.,Hunt, Kristopher A.,Bryson, Samuel J.,&Winkler, Mari K. H..(2024).Impact of aerobic granular sludge sizes and dissolved oxygen concentration on greenhouse gas N2O emission.WATER RESEARCH,255.
MLA	Quoc, Bao Nguyen,et al."Impact of aerobic granular sludge sizes and dissolved oxygen concentration on greenhouse gas N2O emission".WATER RESEARCH 255(2024).