This study uses activated sludge from wastewater treatment that is increasing in quantity significantly every year. It creates environment and disposal problems as well as waste management problem. Pyrolysis is a thermochemical prosess which convert activated sludge to gas, oil and charcoal, and can be appied to produce fuels from activated sludge. The pyrolysis kinetic of activated sludge is investigated with a thermogravimetric analyser (TGA). The experiments are carried out in nitrogen atmosphere at pyrolysis temperature (523-688 K) and various heating rates of 5, 10, 20 and 50 K/min. Four samples of activated sludge are taken from wastewater treatment of textile plant, center plant, Huaykwang district and National of Petrolchemical plant. The results indicate that activated sludge have volatile matter in the range of 31-60% and heating value in the range of 1600-5600 cal/g. that can be converted to new source of energy. From the TGA studies, the heating rate and temperature mainly affect the total weight percent loss. The higher heating rate shows lower conversion and high pyrolysis temperature. From kinetic studies, Arrhenius's law and DEAM model are developed to simulate this pyrolysis process and to determine the activation energy (Ea) and pre-exponential factor (k0). From DEAM model, at different conversions, the different E (30-650 kJ/mol), indicate that different multiple reactions take place at different stages.The kinetic parameters from this studies can be used to predict rate, mechanism of reactions and design reactor
