抄録
Eleven continuous measurements of N_2O were done for 6 incinerators in 7∿14 days for each measuring period. N_2O emission was much changed with operation condition of incinerator. This result suggests that determination of N_2O emission factor by grab sampling or short term measurement may have low certainty. N_2O emission was almost determined by the highest freeboard temperature of the incinerator. Average N_2O emission factor 11 measurements was 792 g-N_2O/t-WS. Operation data of 17 incinerators was analyzed and N_2O emission factors were estimated by using a correlation between the highest freeboard temperature and conversion of N in sludge to N_2O. Average N_2O emission factor of 17 units was estimated as 696 g-N_2O/t-WS. This value was almost same as the value obtained by our field measurements. Japan's annual N_2O inventory from the sewage sludge incineration by fluidized bed incinerator was estimated as 2.6Gg-N_2O year.
