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首页> 外文期刊>International Biodeterioration & Biodegradation >Effect of the dissolved oxygen concentration on the N2O emission from an autotrophic partial nitritation reactor treating high-ammonium wastewater
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Effect of the dissolved oxygen concentration on the N2O emission from an autotrophic partial nitritation reactor treating high-ammonium wastewater

机译：自溶部分硝化反应器处理高铵废水中溶解氧浓度对N2O排放的影响

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A laboratory-scale sequencing batch reactor (SBR) fed with synthetic high-ammonium wastewater was operated for partial nitritation, and the effect of the dissolved oxygen (DO) concentration on the N2O emission was investigated. From a macroscopic viewpoint, as the DO concentration increased from 035 to 0.60 and 0.85 mg l(-1), the N2O emission factor (the ratio between N2O nitrogen emitted and the influent total nitrogen) decreased from 235% +/- 0.32% to 1.81% +/- 0.16% and 0.57% +/- 0.08%, respectively. When air was replaced with N-2 for blowing, N2O emission was also observed, demonstrating the N2O production pathway of denitrification. A higher ammonia oxidation rate (AOR) led to a lower N2O emission rate, and the concentration of free nitrous acid (FNA) had no obviously effect on the N2O emission. From a microscopic viewpoint, nitrogen transformation inside sludge aggregates under different DO concentrations was investigated by using microelectrodes. It demonstrated that N2O production increased with decreasing DO concentration, and at lower DO concentrations (035 and 0.60 mg l(-1)) N2O production enhanced from denitrification pathway. (C) 2016 Published by Elsevier Ltd.
机译：在实验室规模的分批反应器（SBR）中加入合成高铵废水，进行部分硝化操作，并研究了溶解氧（DO）浓度对N2O排放的影响。从宏观的角度来看，随着DO浓度从035增加到0.60和0.85 mg l（-1），N2O排放因子（N2O氮排放量与流入的总氮之比）从235％+/- 0.32％降低至分别为1.81％+/- 0.16％和0.57％+/- 0.08％。用N-2代替空气进行吹气时，还观察到N2O的排放，说明了N2O的反硝化生产途径。较高的氨氧化速率（AOR）导致较低的N2O排放速率，而游离亚硝酸（FNA）的浓度对N2O排放没有明显影响。从微观的角度，利用微电极研究了不同溶解氧浓度下污泥团聚体内部的氮转化。结果表明，随着DO浓度的降低，N2O的产量增加，而在较低的DO浓度（035和0.60 mg l（-1））下，N2O的产量通过反硝化途径而增加。 （C）2016由Elsevier Ltd.出版

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