High Production of Nitrous Oxide (N 2 O) via Acidic Denitrification

Le résumé fourni par la source

Nitrous oxide (N 2 O) recovery in wastewater management offers a promising dual benefit of resource recovery and greenhouse gas reduction. This study demonstrates significant N 2 O 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-N 2 O conversion efficiency exceeding 60%, with a production rate of 6.0 ± 0.2 mg of N 2 O-N h –1 (g volatile suspended solids) −1 . Stable acidic denitrification was sustained in semicontinuous operation, with liquid N 2 O concentrations accumulating up to 150 mg of N/L. This discovery introduces a novel pathway for N 2 O production and recovery, offering new possibilities for wastewater nitrogen management.

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