Abstract
The effect of urea injection (selective non catalytic reduction of NOx) on N2O emission was investigated at a municipal solid waste incineration plant in Osaka City. N2O concentration in the case of urea injection was found to be greater to about fivefold of that in the case of non injection. The change in N2O concentration was very small or negligible between at the exit of electrostatic precipitator and at that of scrubber with or without urea injection. It is estimated that about 14% of reduced NOx is converted into N2O in the present study. It is tentatively assumed that NCO derived from urea may contribute to the reduction of NOx to form N2O.
