Zhiqiang Zuo, Tianyi Zhang, Xiaotong Cen, Xi Lu, Tao Liu and Min Zheng*,
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High Production of Nitrous Oxide (N2O) via Acidic Denitrification
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.
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.
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