ABSTRACT
ABSTRACT: Wastewater land treatment system can remove pollutants deeply through a combination process of physical, chemical and biological functions. During the complex process of biological metabolism, greenhouse gases, such as nitrous oxide (N2O), are released from the substrate bed, causing the block of land treatment system and the destruction of atmospheric environment. This paper reviews the production mechanism of N2O released from wastewater land treatment system. Furthermore, the influence of impact factors (types of system, plant and temperature) on N2O release characteristic was summarized in constructed wetland system, slow rate land treatment system, rapid infiltration system, overland flow system and subsurface wastewater infiltration system. The method of accounting N2O releasing flux was introduced. Finally, the viewpoint was pointed out that temperature, matrix composition and operation conditions affect N2O releasing flux considerably.
