DESTRUCTION OF CHLORINATED HYDROCARBONS IN A CEMENT KLIN

The results show that very small emissions occur during combustion of different chlorinated hydrocarbons. For most of the substances analyzed, the emissions are lower than analytical detection limits. This means that the emissions of methylene chloride and trichloroethylene present in the solvent waste are less than 50 and 2 mg/kg, respectively, of fed substance. The test conducted on PCB shows that the destruction is better than 99.999 98%, which means that the emission is less than 0.2 mg/kg of fed PCB. In the tests on chlorinated phenols, peaks were observed indicating that very small concentrations of hepta- and octachlorodibenzo-p-dioxin may occur in the flue gases. Owing to the small amounts, no complete analytical verification was possible. The effects on cement production were studied in a long-term experiment, which showed that no change in cement quality and no interruption in operations occurred up to a chlorine input of 0.7% of the clinker production. At a higher input, there were tendencies for ring formation. © 1979, American Chemical Society. All rights reserved.