High Production of Nitrous Oxide (N2O) via Acidic Denitrification

IF 8.9 2区环境科学与生态学 Q1 ENGINEERING, ENVIRONMENTAL

Environmental Science & Technology Letters Environ. Pub Date : 2025-03-27 DOI:10.1021/acs.estlett.5c0025510.1021/acs.estlett.5c00255

Zhiqiang Zuo, Tianyi Zhang, Xiaotong Cen, Xi Lu, Tao Liu and Min Zheng*,

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Abstract

Nitrous oxide (N₂O) recovery in wastewater management offers a promising dual benefit of resource recovery and greenhouse gas reduction. This study demonstrates significant N₂O production via microbial denitrification under acidic conditions. Using a bioreactor maintained at pH 5, continuously fed with nitrite and acetate, an acidic microbial culture was cultivated with Rhodanobacter emerging as the dominant denitrifying genus. The culture achieved a nitrite-to-N₂O conversion efficiency exceeding 60%, with a production rate of 6.0 ± 0.2 mg of N₂O-N h^–1 (g volatile suspended solids)⁻¹. Stable acidic denitrification was sustained in semicontinuous operation, with liquid N₂O concentrations accumulating up to 150 mg of N/L. This discovery introduces a novel pathway for N₂O production and recovery, offering new possibilities for wastewater nitrogen management.

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通过酸性反硝化高产一氧化二氮（N2O）

废水管理中的一氧化二氮（N2O）回收具有资源回收和温室气体减排的双重效益，前景广阔。这项研究表明，在酸性条件下，通过微生物反硝化作用可以产生大量的一氧化二氮。利用一个 pH 值保持在 5 的生物反应器，持续注入亚硝酸盐和醋酸盐，培养了一种酸性微生物培养物，其中罗丹菌是主要的反硝化菌属。该培养物的亚硝酸盐-N2O 转化效率超过 60%，生产率为 6.0 ± 0.2 毫克 N2O-N h-1（克挥发性悬浮固体）-1。在半连续运行过程中，稳定的酸性反硝化过程得以持续，液态 N2O 浓度最高可积累到 150 毫克 N/L。这一发现为一氧化二氮的生产和回收提供了新的途径，为废水氮管理提供了新的可能性。

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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来源期刊

Environmental Science & Technology Letters Environ. ENGINEERING, ENVIRONMENTALENVIRONMENTAL SC-ENVIRONMENTAL SCIENCES

CiteScore

17.90

自引率

3.70%

发文量

163

期刊介绍： Environmental Science & Technology Letters serves as an international forum for brief communications on experimental or theoretical results of exceptional timeliness in all aspects of environmental science, both pure and applied. Published as soon as accepted, these communications are summarized in monthly issues. Additionally, the journal features short reviews on emerging topics in environmental science and technology.