Abiotic Nitrous Oxide (N2 O) Production Is Strongly pH Dependent, but Contributes Little to Overall N2 O Emissions in Biological Nitrogen Removal Systems

Environmental Science & Technology
Qingxian SuBarth F Smets

Abstract

Hydroxylamine (NH2OH) and nitrite (NO2-), intermediates during the nitritation process, can engage in chemical (abiotic) reactions that lead to nitrous oxide (N2O) generation. Here, we quantify the kinetics and stoichiometry of the relevant abiotic reactions in a series of batch tests under different and relevant conditions, including pH, absence/presence of oxygen, and reactant concentrations. The highest N2O production rates were measured from NH2OH reaction with HNO2, followed by HNO2 reduction by Fe2+, NH2OH oxidation by Fe3+, and finally NH2OH disproportionation plus oxidation by O2. Compared to other examined factors, pH had the strongest effect on N2O formation rates. Acidic pH enhanced N2O production from the reaction of NH2OH with HNO2 indicating that HNO2 instead of NO2- was the reactant. In departure from previous studies, we estimate that abiotic N2O production contributes little (< 3% of total N2O production) to total N2O emissions in typical nitritation reactor systems between pH 6.5 and 8. Abiotic contributions would only become important at acidic pH (≤ 5). In consideration of pH effects on both abiotic and biotic N2O production pathways, circumneutral pH set-points are suggested to minimize overall N2O emission...Continue Reading

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Mar 29, 2019·Water Research·Qingxian SuBarth F Smets

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Citations

Jan 6, 2021·Environmental Science and Pollution Research International·Zhao LiXiaoyan Li
Dec 23, 2020·Water Research·Aina Soler-JofraMark C M van Loosdrecht
Jul 23, 2021·Environmental Science & Technology·Xuefeng PengBess B Ward
Jul 25, 2021·The Science of the Total Environment·Xinyu WanEveline I P Volcke
Sep 5, 2019·Environmental Science & Technology·Heidy CruzIlje Pikaar
Jul 14, 2020·Environmental Science & Technology·Lan WuBing-Jie Ni
Nov 7, 2021·The Science of the Total Environment·Zeyu LiYong Sik Ok

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