FORMATION OF CHLORINATED AROMATIC-COMPOUNDS IN THE RAW GAS OF WASTE INCINERATION PLANTS

Selected experiments were performed at the TAMARA waste incineration p ilot plant with a view to identify the formation mechanism of chlorina ted aromatic compounds during dust separation by fabric filters at tem peratures above 200 degrees C, Significant formation of chlorinated ar omatic compounds studied from precursors possibly contained in the flu e gas could not be proven in the experiments performed. Formation of c hlorinated aromatic compounds was compared with carbon conversion in t he filter cake. According to balancing, the fraction of converted carb on that is found in the chlorinated aromatic compounds amounts to a fe w percent at a temperature of 240 degrees C and is constant in the fir st approximation. Chlorinated aromatic compounds are generated from th e fine particulate residual carbon of the fly ashes, Therefore, a de-n ovo synthesis has to be postulated as mechanism. (C) 1997 Elsevier Sci ence Ltd.