Abstract
In general, electric power and dewatering-aids chemicals are introduced in the dewatering process. In this study, the relationship between the operational CO2 consumption for a lower moisture content cake in dewatering process and CO2 reduction due to fuel savings in incineration, was evaluated. As the results, the dosing rate control of polymer flocculant was the most effective method for overall reduction of CO2 including dewatering and incineration, as well as for acquiring lower moisture content in the investigated dewatering processes; solid bowl centrifuge and belt press. As an additional investigation for effective energy utilization in sludge treatment system, life cycle assessment of CO2 (LCCO2) of regional hot water supply system for a residential area using scrubber washing water of incineration exhaust gas was also conducted.
