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首页> 外文期刊>Environmental Science & Technology >Abiotic Nitrous Oxide (N_2O) Production Is Strongly pH Dependent, but Contributes Little to Overall N_2O Emissions in Biological Nitrogen Removal Systems
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Abiotic Nitrous Oxide (N_2O) Production Is Strongly pH Dependent, but Contributes Little to Overall N_2O Emissions in Biological Nitrogen Removal Systems

机译：非生物一氧化二氮（N_2O）的生产强烈依赖于pH，但对生物脱氮系统中总体N_2O排放的贡献很小

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摘要

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 O-2. 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 N2O- 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 emissions from nitritation systems.
机译：硝化过程中的中间体羟胺（NH2OH）和亚硝酸盐（NO2-）可以参与化学（非生物）反应，导致生成一氧化二氮（N2O）。在这里，我们在一系列不同条件和相关条件下（包括pH值，氧气的存在/不存在以及反应物的浓度），通过一系列分批测试对相关非生物反应的动力学和化学计量进行了定量。从NH2OH与HNO2的反应，然后是Fe2 +还原HNO2，Fe3 +氧化NH2OH，最后是NH2OH歧化和O-2氧化，可以测量出最高的N2O生成率。与其他检查因素相比，pH对N2O形成速率的影响最大。酸性pH值提高了NH2OH与HNO2的反应中N2O的产生，表明HNO2代替了N2O-。与先前的研究不同，我们估计在典型的硝化反应器系统中，pH值介于6.5和8之间，非生物N2O的产生对N2O排放总量的贡献很小（

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  • 来源
    《Environmental Science & Technology》 |2019年第7期|3508-3516|共9页
  • 作者

    Su Qingxian; Domingo-Felez Carlos; Jensen Marlene Mark; Smets Barth F.;

  • 作者单位

    Tech Univ Denmark, Dept Environm Engn, DK-2800 Lyngby, Denmark;

    Tech Univ Denmark, Dept Environm Engn, DK-2800 Lyngby, Denmark;

    Tech Univ Denmark, Dept Environm Engn, DK-2800 Lyngby, Denmark;

    Tech Univ Denmark, Dept Environm Engn, DK-2800 Lyngby, Denmark;

  • 收录信息 美国《科学引文索引》(SCI);美国《工程索引》(EI);美国《生物学医学文摘》(MEDLINE);美国《化学文摘》(CA);
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