对污水处理厂一氧化二氮排放量的过度简化和错误估计

IF 25.7 1区 环境科学与生态学 Q1 ENVIRONMENTAL SCIENCES Nature Sustainability Pub Date : 2024-08-27 DOI:10.1038/s41893-024-01420-9
Cuihong Song, Jun-Jie Zhu, John L. Willis, Daniel P. Moore, Mark A. Zondlo, Zhiyong Jason Ren
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引用次数: 0

摘要

废水处理是人为一氧化二氮(N2O)排放的主要来源。然而,目前的排放量估算依赖于政府间气候变化专门委员会提出的统一排放系数 (EF),该系数基于一个存在大量不确定性和不准确性的有限数据库。为解决这一局限性,本研究将数据库扩大了 12 倍,并开发了一种基于层级的方法。我们的方法考虑了不同空间尺度、处理过程和监测技术的排放变化,从而能够进行更精确的估算。在此,我们将这种方法应用于美国数据库,强调了目前基于统一环境系数进行估算的局限性,并将美国的平均废水一氧化二氮排放量量化为 11.6 百万公吨二氧化碳当量。研究结果还揭示了废水一氧化二氮排放的多样性,并强调了采用定制方法为设施级一氧化二氮排放估算提供信息以及为国家和行业范围温室气体清单提供信息的必要性,同时强调了对具体地点的考虑。总之,本研究为重新校准废水一氧化二氮排放量的估算提供了一个工具,而一氧化二氮排放量的估算是减少废水处理碳足迹的基础。目前,估算废水处理过程中氧化亚氮(N2O)排放量的方法有其内在的局限性,导致很大的不确定性和不准确性。在此,作者介绍了一种基于层级的方法,以实现更精确的废水一氧化二氮排放量估算。
本文章由计算机程序翻译,如有差异,请以英文原文为准。

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Oversimplification and misestimation of nitrous oxide emissions from wastewater treatment plants
Wastewater treatment is a major source of anthropogenic nitrous oxide (N2O) emissions. However, the current emission estimations rely on a uniform emission factor (EF) proposed by the Intergovernmental Panel on Climate Change based on a limited database suffering from large uncertainties and inaccuracies. To address this limitation, this study expands the database 12-fold and develops a tier-based approach. Our method considers emission variations across spatial scales, treatment processes and monitoring techniques, enabling more-precise estimations. Here, applying this approach to the US database, we highlight the limitations of current estimations based on uniform EFs and quantified the mean wastewater N2O emission in the United States to be 11.6 MMT CO2-eq. The results also reveal the diverse nature of wastewater N2O emissions and underscore the need for a customized approach to inform facility-level N2O emission estimation as well as inform national- and sector-wide greenhouse gases inventories with emphasis on site-specific considerations. Overall, this study provides a tool to recalibrate the estimations of wastewater N2O emissions, which form the foundation of carbon footprint reduction in wastewater treatment. At present, methods to estimate nitrous oxide (N2O) emissions from wastewater treatment have intrinsic limitations leading to large uncertainties and inaccuracies. Here the authors introduce a tier-based approach to enable more-precise estimation of wastewater N2O emissions.
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来源期刊
Nature Sustainability
Nature Sustainability Energy-Renewable Energy, Sustainability and the Environment
CiteScore
41.90
自引率
1.10%
发文量
159
期刊介绍: Nature Sustainability aims to facilitate cross-disciplinary dialogues and bring together research fields that contribute to understanding how we organize our lives in a finite world and the impacts of our actions. Nature Sustainability will not only publish fundamental research but also significant investigations into policies and solutions for ensuring human well-being now and in the future.Its ultimate goal is to address the greatest challenges of our time.
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