| 以甲醇为碳源生物反硝化过程释放一氧化二氮的试验研究 |
| 摘要点击 2481 全文点击 1146 投稿时间：2012-07-14 修订日期：2012-08-29 |
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| 中文关键词 一氧化二氮(N2O) 温室气体 反硝化 碳氮比 亚硝酸盐 |
| 英文关键词 nitrous oxide(N2O) greenhouse gas denitrification C/N ratios nitrite |
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| 中文摘要 |
| 污水生物反硝化脱氮过程是一氧化二氮(N2O)的重要释放源之一. 试验采用序批式反应器以甲醇为碳源(电子供体),硝酸盐(NO3--N)为电子受体驯化反硝化菌,并采用批处理试验研究不同电子受体、不同碳氮(C/N)比和不同初始亚硝酸盐(NO2--N)质量浓度条件下N2O释放情况. 在典型周期试验和批处理试验中均能检测到N2O的释放. 以NO2--N为电子受体时会释放较多的N2O,而以NO3--N为电子受体时释放的N2O相对较少. 不同C/N比通过影响反硝化菌的活性进而影响N2O的释放,反硝化菌的活性和N2O的释放量均随着C/N比的降低而降低. N2O的释放量随着初始NO2--N质量浓度的增加而增加,一定浓度范围内的NO2--N会增强反硝化菌的活性. 初始NO2--N质量浓度与N2O的释放量具有较好的指数相关性. |
| 英文摘要 |
| Denitrification of wastewater is one of the important sources of nitrous oxide (N2O). In this study, denitrifies were acclimated in a sequencing batch reactor with methanol and nitrate (NO3--N) as the electron donor and acceptor, respectively. N2O emission during denitrification was examined both in typical cycles and in batch experiments under conditions of different electron acceptors, carbon/nitrogen (C/N) ratios and initial nitrite (NO2--N) concentrations. With methanol as the organic carbon, the N2O emission was high with NO2--N as the electron acceptor and the N2O emission was low with NO3--N as the electron acceptor. The C/N ratios affected the emission of N2O by affecting activities of denitrifiers, and both the activity of denitrifiers and the emission of N2O decreased with decreasing C/N ratios. The N2O emission increased with increasing initial NO2--N concentrations, and a certain range of NO2--N concentrations enhanced the activity of denitrifiers. The N2O emission could be correlated very well with initial NO2--N concentrations. |
