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Nitrous oxide emission mitigation from biological wastewater treatment - A review

期刊

BIORESOURCE TECHNOLOGY
卷 362, 期 -, 页码 -

出版社

ELSEVIER SCI LTD
DOI: 10.1016/j.biortech.2022.127747

关键词

Biological wastewater treatment; Nitrous oxide emission; Nitrous oxide recovery; Metabolic pathway; Mitigation strategy; Metrics analysis

资金

  1. JSPS KAKENHI [JP22K19863]

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This review provides updated information on the biological pathways for N2O production and consumption, as well as the critical process factors affecting N2O emission. It also highlights the importance of research needs and the promising recovery options for waste gas.
Nitrous oxide (N2O) emitted from wastewater treatment processes has emerged as a focal point for academic and practical research amidst pressing environmental issues. This review presents an updated view on the biological pathways for N2O production and consumption in addition to the critical process factors affecting N2O emission. The current research trends including the strain and reactor aspects were then outlined with discussions. Last but not least, the research needs were proposed. The holistic life cycle assessment needs to be performed to evaluate the technical and economic feasibility of the proposed mitigation strategies or recovery options. This review also provides the background information for the proposed future research prospects on N2O mitigation and recovery technologies. As pointed out, dilution effects of the produced N2O gas product would hinder its use as renewable energy; instead, its use as an effective oxidizing agent is proposed as a promising recovery option.

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