短程硝化过程中硝化速率与N2O产生速率的关系

doi:10.11949/j.issn.0438-1157.20150443

摘要/Abstract

摘要：

N₂O是3种主要的温室气体之一,污水的生物脱氮过程是N₂O产生的一个主要人为来源。通过对不同条件下生活污水短程硝化过程中N₂O的产生情况进行研究,考察了短程硝化过程中硝化速率(AOR)与N₂O产生速率(N₂OR)之间的关系。结果表明:随着DO水平的提高,AOR逐渐上升,N₂OR则呈现先增加后减少的趋势;最大N₂OR出现在DO为0.6 mg·L^-1时,为1.29 mg N₂O-N·(g MLVSS)^-1·h^-1。低DO水平下AOR的提高会引起N₂OR的增加;但高DO水平下较高的AOR不一定产生较多的N₂O。不同条件下,N₂O的产生途径不同,引起N₂OR的变化。在DO较低时,N₂O的产生以NH₂OH/NOH途径为主,AOR的提高会促进N₂O产生;随着DO的增加,N₂O的产生途径主要为AOB的有氧反硝化作用,此时较高的DO水平会对这一反应造成抑制,虽然反应过程中AOR较高,但N₂OR处于较低水平。

关键词: 短程硝化, 硝化速率, N₂O产生速率, 温室气体, 环境, 数值分析

Abstract:

Nitrous oxide (N₂O) is one of the three main greenhouse gases (CO₂, CH₄, N₂O), about 265 times more effective than carbon dioxide (CO₂), and it may also destruct the ozone layer. In wastewater biological nitrogen removal process, autotrophic nitrification has been thought to be the major source of N₂O production. In this study, by testing the production of N₂O under different conditions, the relationship between N₂O production rate and ammonia oxidation rate during nitritation process was investigated in a laboratory batch-scale system with activated sludge for treating domestic wastewater. The experimental data indicated that the ammonia oxidation rate (AOR) increased with higher DO while N₂O production rate (N₂OR) increased first then decreased. Besides the AOR and N₂OR were by varying the initial ammonium (NH₄⁺-N) concentration in batch experiments. The max N₂OR was 1.29 mg N₂O·(g MLVSS)^-1·h^-1 when DO was 0.6 mg·L^-1. At low DO level, the increase of AOR would promote the N₂OR. On the other hand, higher AOR might not produce more N₂O when DO was high. There were different pathways of N₂O production under various conditions which led to the change of N₂OR. When DO was low, N₂O was mainly produced by nitrosyl radical (NOH), while increasing AOR promoted the N₂OR formation. However, nitrifier denitrification by AOB was the main way of producing N₂O at high DO level. This pathway might be inhibited by high DO, and thus even there was high AOR, the net production of N₂O was still less. In addition, the existence of was very important to N₂O production too.

Key words: nitritation process, ammonia oxidation rate, N₂O production rate, greenhouse gas, environment, numerical analysis

中图分类号:

X703

刘越, 李鹏章, 彭永臻. 短程硝化过程中硝化速率与N₂O产生速率的关系[J]. 化工学报, 2015, 66(11): 4652-4660.

LIU Yue, LI Pengzhang, PENG Yongzhen. Relationship between N₂O production rate and ammonia oxidation rate during nitritation process[J]. CIESC Journal, 2015, 66(11): 4652-4660.

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短程硝化过程中硝化速率与N₂O产生速率的关系

Relationship between N₂O production rate and ammonia oxidation rate during nitritation process

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