FORMATION MECHANISMS FOR BENZENE AND TOLUENE DURING SEWAGE SLUDGE INCINERATION.

摘要

Air-dried sewage sludge was combusted in a laboratory furnace at different temperatures and percents stoichiometric oxygen. The concentrations of benzene and toluene in the effluent gas were determined. The quantity of benzene and toluene increased with decreasing oxygen levels. Increasing the temperature from 750(DEGREES)C to 1000(DEGREES)C caused an increase in the concentration of benzene. The temperature of maximum toluene production was 850(DEGREES)C. Above that temperature toluene was thermally unstable.; The fatty acids in the grease and oil fraction of the sludge were found to be the source of the benzene and toluene.; Reaction mechanisms leading from the fatty acids to benzene and toluene were proposed.