Korean food waste sludge was degraded by using a new thermal degradation method. In this system, radish contained waste food sludge as main portion was selected as a standard ma- terial. Products of thermal degradation were mainly composed of carbonized solid, small amounts of oil and methane. Total energy production was dependent on the reaction temper- ature. About 25-32% of solid in the radish was converted to carbonized solid in the thermal degradation of radish at 200℃. The heating values of the carbonized solid and the liquefied heavy oil were 4000-6000 cal/g and about 8000 cal/g respectively. Various catalysts were also examined to improve the carbonized solid used as energy source. Acid clay and Montmo- rillonite KSF catalysts showed the best results among the catalysts tested. From the energy balance, this thermal degradation process operated at 200℃ was a net energy producer.

Catalyst Thermal Degradation Food Sludge Treatment of Food Sludge

Dote Y, Yokoyama S, Minowa T, Masuta T, Biomass Bioenerg., 4, 243 (1993) 
Garg M, Piskorz J, Scott DS, Radlein D, Ind. Eng. Chem. Res., 27, 256 (1988) 
Ku CG, "Study on Conversion of Biodegradable Waste Sludge," KIST, Report of Basic Research, 13 (1992)
Mallya N, Helt JE, Res. Thermochemical Biomass Convers., 111 (1988)
Maniatis K, Buckens A, Res. Thermochemical Biomass Convers., 179 (1988)
Scott DS, Piskorz J, Radleign D, Ind. Eng. Chem. Res., 24, 581 (1986)
Suzuki A, Nakamura T, Yokoyama S, J. Chem. Eng. Jpn., 23(1), 6 (1990) 
Yokoyama S, Ogi T, Koguchi K, Nakamura T, Liq. Fuel Technol., 2(2), 155 (1984)