中文摘要：

碳源是污水生物处理过程中N2O释放的重要影响因素.本试验以不同碳源（葡萄糖、乙酸钠和淀粉）条件下的SBR反应器为研究对象,分析了碳源类型对于N2O释放的影响作用.结果发现,N2O释放主要发生在好氧段,且释放总量受碳源影响,以乙酸钠为碳源的反应器产生的N2O最多,释放速率最大,其次为葡萄糖,淀粉最少,N2O转化率分别为7.80%,5.43%,2.59%.OUR试验结合PCR-DGGE分析,以乙酸钠为碳源时氨氧化菌优势种群发生了变化,测序结果表明其为Nitrosomonas属细菌,因此N2O释放的差异是不同碳源条件下AOB菌群不同及其反硝化能力的不同所造成的.

英文摘要：

Carbon source is an important factor affecting the emission of nitrous oxide （N2O） in biological wastewater treatment processes.In this study,the effect of carbon source on N2O emission was evaluated in three sequencing batch reactors （SBRs） acclimated under different carbon sources （i.e.glucose,acetate,and starch）.Our results showed that most of the N2O emission occurred during the aerobic phase.Carbon source had an important effect on N2O emission.The highest amount and rate of N2O emission was observed in the SBR acclimated under acetate followed in order by glucose and starch.The conversion rate of N2O was determined to be 7.80%,5.43%,and 2.59%,respectively.According to results from OUR measurements and PCR-DGGE analyses,the dominating population of AOB community （e.g.Nitrosomonas in acetate SBR） was found to considerably change with varying carbon sources.This suggested that the effect of carbon source on N2O emission was most likely attributed to the difference in AOB community and the associated denitrification capability.