Sewage sludge samples from sewage treatment plant were dewatered by centryfuging, and analyzed for chem. compn. and phys. properties. The gasification conducted in presence of 3 gazyfying agents (O-2, air and steam) was math. modeled. Compn. of the syngas was calcd. by using the stoichiometric equal. model of the gasification process. Combustion of the syngas and biogas showed much lower CO2 emission than of sewage sludge.