Municipal sewage sludge (i.e. sludge) at various temperature ranges was analyzed by proximate analysis and thermogravimetric analysis methods. The gaseous components produced by the sludge pyrolysis were detected by gas chromatography (GC)

while the morphology and specific surface area of pyrolytic char measured by SEM and BET techniques

respectively. The results show that the pyrolysis process of sludge can involve water evaporation

organics volatilization and char formation steps. There are obvious differences between the gas components obtained at different ranges of pyrolysis temperature. The H2 content will rapidly increase when pyrolysis temperature is larger than 350℃

the maximum CH4 content obtained when temperature is in 350-450℃

the temperature range generated CO is mainly in 350-750℃

and the CO2 content declines for the whole range of pyrolysis temperature. With rising final temperature of pyrolysis

the char structure becomes more and more loose and it specific surface area increases. The maximum specific surface area of char produces is 55 m2·g-1 at 750℃.