The concentration of CH
4, CO
2 and N
2O 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 CO
2and N
2O gas was emitted from the aeration tanks. In particular, emission of N
2O was largely correlated with NO
2-N concentration.
3) Generation of global-warning-gas from the sewerage plant was calculated as 650, 94200, and 82kg/day for CH
4, CO
2and N
2O, respectively.
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