An advanced wastewater treatment system with pre-coagulation process is going to be developed and the influence of the pre-coagulation process on the sewage sludge treatment system is elucidated. In this study, an object-oriented analysis was demonstrated to optimize a sludge treatment system with pre-coagulation process. A computer program was developed to calculate mass balance of solids, costs, and site area requirement in each sludge treatment process. The optimized sludge treatment system was extracted by simulating about 100, 000 patterns of treatment system. The optimized sludge treatment system consists of pre-coagulation process with FeCl3 (6mg Fe/L) +anionpolymer (0.6mg/L), nitrification and denitrification with biofilm process granulator-thickening process, centrifuge dewatering process, circulating fluidized bed incineration process, and ash melting process.
