中南大学学报（自然科学版）2012，Vol.43Issue(1)：395-400,6.
DO对短程反硝化过程中N2O产量的影响
Effect of DO on N2O emission during nitrite denitrification process
摘要
Abstract
The effect of DO (Dissolved oxygen) on the kinetics of nitrite denitrification, as well as the corresponding N2O accumulation and emission were investigated using 2.4 L sequencing batch reactor. The results show that NaNO2 is added at the initial of the test to the final NO2-N mass concentration of 40 mg/L. The aeration rate is controlled at 0.3 L/min and the ratio of N2 to O2 is adjusted so that the DO can be controlled at 0, 0.1, 0.3, 0.5 and 0.7 mg/L and the N2O emission is 0.41, 0.60, 2.62, 4.98, 6.83 mg/L, respectively. The denitrification rate decreases with the increase of DO mass concentration. The nitrite reduction rate per gram of mixed liquor suspended solid (MLSS) decreases from 14.9 to 10.2 mg/(Lh), while the N2O emission rate per gram of MLSS increases from 0.2 to 1.9 mg/(Lh). The reason may be that higher DO mass concentration inhibits the activity of N2O reductase thus results in higher N2O production as to higher N2O emission. Besides, higher nitrite presence inhibits the activity of nitrous oxide reduction enzymes which is responsible for N2O reduction. To reduce DO mass concentration in anoxic tanks during nitrogen removal process may be the efficient way to reduce N2O emission during nitrite denitrification process.关键词
溶解氧/氧化亚氮/亚硝态氮/抑制作用Key words
dissolved oxygen/ nitrous oxide/ nitrite/ inhibition分类
资源环境引用本文复制引用
巩有奎,王淑莹,王莎莎,王赛,彭永臻..DO对短程反硝化过程中N2O产量的影响[J].中南大学学报（自然科学版）,2012,43(1):395-400,6.基金项目
城市水资源与水环境国家重点实验室开放基金资助项目(QAK201006) （QAK201006）
北京市属高等学校人才强教计划高层次人才资助项目(PHR20090502) （PHR20090502）
北京工业大学第9届研究生科技基金重点资助项目(ykj-2011-5374) （ykj-2011-5374）
