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中文摘要：
介绍了污水生物处理过程中N2O的产生途径,重点分析了污水厂典型脱氮工艺的N2O释放差异及其原因,提出了城市污水脱氮处理过程N2O减排的具体措施,并估算出全国城镇污水处理厂2011年N2O释放总量约为1.26×109g（以N计）,对今后关于城市污水脱氮处理过程N2O产生及减排的研究趋势进行了评估.
英文摘要：
The pathways for nitrous oxide （N2O） production from biological nitrogen removal processes in wastewater treatment plants （WWTPs） are illustrated. Comparative analyses of N2O emissions from some typical wastewater treatment processes are conducted and the mechanisms for their discrepancy are discussed in detail. The methods for reduction of N2O emission are proposed. According to the recommended N2O emissions factors,the gross quantity of N2O emissions from WWTPs in China is estimated to be 1.26×109g in 2011. Further study on N2O emissions from biological wastewater treatment processes is recommended.
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