中文摘要：

针对温室气体N2O在大气中含量逐年上升的趋势，现有的大量研究表明，污水生物脱氮过程中微生物的硝化及反硝化代谢过程是污水处理过程中N2O的主要产生源．从微生物学和生物化学的角度详细论述污水生物脱氮过程中N2O的生成机理，并对影响其产生量大小的因素温度、pH、溶解氧、SRT及C／N比等进行详细论述．最后从微生物种群优化和工艺运行的角度出发，初步提出降低污水生物脱氮过程中N2O逸出量的控制策略，即维持相对较长的SRT，曝气时DO充足，反硝化时保证良好的缺氧条件，并维持系统处于中性或偏碱性条件．

英文摘要：

Aiming at the increasing concentration of N20 in the atmosphere year by year, nitrification and denitrification in biological nitrogen removal process are considered as the major sources for N20 production in wastewater treatment. The emission mechanics, affecting factors such as temperature, pH, dissolved oxygen concentration （DO）, SRT and carbon to nitrogen ratio （C/N） of wastewater are discussed in this paper. Finally, the preliminary strategies for N20 emission control from wastewater treatment of biological nitrogen removal are put forward based on microorganism population optimization and process operation which affect the N20 production： the maintenance of relative long SRT, high DO concentration during aeration, strict anoxic condition in denitrifying and neutral or alkaline condition.