Effect of carbon source types on nitrous oxide emission during wastewater treatment
碳源类型对污水生物处理过程中氧化亚氮释放的影响

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.