Silcox, GD; Larsen, FS; Owens, WD; Choroszy-Marshall, M
BIOSIS COPYRIGHT: BIOL ABS. The kinetics of hydrocarbon removal from contaminated clay soils during thermal treatment in rotary kilns were studied experimentally, and kinetic parameters were obtained for simple first-order models. Results are given for seven hydrocarbons: toluene, naphthalene, n-hexadecane, lindane (gamma-HCH or 1,2,3,4,5,6-hexachlorocyclohexane), DDT (1,1'-(2,2,2-trichloroethylidene) bis (4-chlorobenzene)), DDD (1,1'-(2,2-dichloroethylidene) bis (4-chlorobenzene)), and DDE (1,1-dichloro-2,2-bis (p-chlorophenyl) ethylene). The activation energies ranged from 18 kJ/mol for toluene on wet soil, to 90 kJ/mol for the chlorinated pesticides. All the kinetic data were obtained in a 130 kW pilot-scale rotary kiln. The wall temperature of the kiln was 700? C for the pesticides. Three of the hydrocarbons, toluene, naphthalene and n-hexadecane, were studied on both wet soil (5.0 and 8.5 wt%) and on oven-dried soil at temperatures ranging from 300 to 650? C in order to understand better the