GASIFICATION CHARACTERISTIC OF SEWAGE SLUDGE IN SUPERCRITICAL WATER

Abstract

The gasification characteristics of sewage sludge were determined under supercritical water conditions using continuous flow reactor. Sewage sludge was gasified at temperatures ranging from 375 to 450 C and a pressure of 25 MPa with the residence time of 5 ̶ 30 s. The gaseous products were analyzed and quantified by gas chromatography, and the total organic carbon in the liquid phase was also determined. Formation of gaseous products was intensively affected by temperature. The higher temperature and longer residence time favored production of H2, CO2, and CH4. The carbon gasification efficiency increased with temperature and residence time.