化工学报Issue(11)：4652-4660,9.DOI:10.11949/j.issn.0438-1157.20150443
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
摘要
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 N2Ounder different conditions, the relationship between N2Oproduction 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 (+4NH-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+4NH was very important to N2O production too.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Key words
nitritation process/ammonia oxidation rate/N2O production rate/greenhouse gas/environment/numerical analysis分类
资源环境引用本文复制引用
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,(11):4652-4660,9.基金项目
国家自然科学基金项目（51478013）；北京市委资助项目。@@@@supported by the National Natural Science Foundation of China (51478013) （51478013）
