N2O emissions from different biological nitrogen removal processes and factors affecting N2O production
不同污水生物脱氮工艺中N2O释放量及影响因素

Microbiological nitrification and denitrification were considered to be the major sources of N2O in wastewater treatment processes. The microbiological mechanism of N2O production in nitrification and denitrification and the basic characteristics of key enzymes related to N2O production were illustrated. In addition, the N2O production of several typical nitrifiers and denitrifiers was summarized. Through analyzing N2O emissions from wastewater treatment plants and different wastewater treatment processes, especially novel wastewater treatment processes, it was concluded that N2O emissions were affected by wastewater characteristics, treatment processes, operating conditions and the structures of microbial communities. Moroover, main factors affecting N2O production were reviewed, including substrate concentration, DO concentration and SRT. Finally, the preliminary strategies for controlling N2O emission from wastewater treatment process were put forward on the basis of synthetically analysis of microbiological mechanism and factors affecting N2O production.