Liang Xiao-ling, Li Ping, Wu Jin-hua, Wang Xiang-de
Key Laboratory of Pollution Control and Ecosystem Restoration in Industry Clusters, Ministry of Education, Key Laboratory of Environmental Protection and Eco-Remediation of Guangdong Regular Higher Education Institutions, College of Environment and Energy, South China University of Technology, Guangzhou 510006, China.
Huan Jing Ke Xue. 2013 May;34(5):1845-50.
Complete simultaneous nitrification and denitrification (SND) was achieved in an air lift circulation bioreactor. Based on this condition, the system could be switched to shortcut SND as the free ammonia (FA) concentration was increased with higher influent pH. The nitrogen removal and N2O emission characteristics of the shortcut SND process were investigated and those of the complete SND process were also observed as control. In the shortcut SND process, the average total nitrogen removal and average SND efficiency reached 71.9% and 80.9%, which was 18.0 and 16.8 percents higher than those in the complete SND process, respectively. In addition, the total nitrogen removal rate in the shortcut SND process was 0.11 mg x (L x min)(-1), 1.4 times as high as that in the complete SND process. Although higher nitrogen removal efficiency was obtained in the shortcut SND process, the mean N2O conversion rate reached 57.1% and the average N2O accumulated emission amount was approximately 4 times higher than that in the complete SND process. The results also indicated that the increase of NO2- -N concentration in the reactor should be responsible for the remarkable enhancement of N2O emission.
在气升循环生物反应器中实现了完全同步硝化反硝化（SND）。在此条件下，随着进水pH值升高，游离氨（FA）浓度增加，系统可切换至短程SND。研究了短程SND工艺的脱氮和N2O排放特性，并将完全SND工艺的特性作为对照进行观察。在短程SND工艺中，平均总氮去除率和平均SND效率分别达到71.9%和80.9%，分别比完全SND工艺高18.0和16.8个百分点。此外，短程SND工艺中的总氮去除速率为0.11 mg x (L x min)(-1)，是完全SND工艺的1.4倍。尽管短程SND工艺获得了更高的脱氮效率，但其平均N2O转化率达到57.1%，平均N2O累积排放量比完全SND工艺高约4倍。结果还表明，反应器中NO2--N浓度的增加应是N2O排放显著增加的原因。
