Emission Characteristics of Greenhouse Gas N2O from Sewage Sludge Incineration Process.

Abstract

N2O is one of the important greenhouse gas, and it has been pointed out that its contribu- tion to global warming will increase in the future. In the past, higher level concentration of N2O emission was reported for some sewage sludge incinerators than at other fixed emission sources including a solid waste incinerator. Therefore, we investigated the practical factors of N2O emission from the sewage sludge incineration originated from the difference of incinerator type and coagulant type used for dehydration. As a result, it was cleared that emitted amount of N2O is strongly depended on the incineration temperature and the coagulant type used for dehydration process. Amounts of N2O emitted from sewage sludge incineration in FY 1995 in Japan was estimated at 4030t on a nitrogen basis and thought to more increase to the future