Abstract
The object of this study is to evaluate quantitatively environmental burdens of the night soil treatment. Energy consumption and CO2 emission were calculated for the night soil treatment facilities and the sludge recycling/treatment center in operation. Averages of 19 facilities for night soil treatment were 1, 099MJ/kl and 74kg-CO2/kl on energy consumption and CO2 emission, respectively. Energy consumption and CO2 emission of a sludge recycling/treatment center were 944MJ/kl and 63kg-CO2/kl, respectively. The reduction effects by applying power generation and composting were accounted for 3% of total environmental burdens. The authors also examined the influence of the design variables such as the scale of facility, the constituent processes and the treatment level of the water quality on environment burdens. In addition, the authors tried to compare the night soil treatment facilities with the sludge recycling/treatment center and the sewerage treatment facility.
