Abstract
The concentration of CH4, CO2 and N2O discharged from treatment processes of a municipal sewerage plant where activated sludge processes have been operated were measured between October 2000 and March 2001, and following results were obtained.
1) Emission of CH4 was significant at both receiving and pre-aeration tanks in the clarifier.
2) Great amount of CO2and N2O gas was emitted from the aeration tanks. In particular, emission of N2O was largely correlated with NO2-N concentration.
3) Generation of global-warning-gas from the sewerage plant was calculated as 650, 94200, and 82kg/day for CH4, CO2and N2O, respectively.
