EXPERIENCE GAINED FROM THE SAMPLING OF CH LORINE AROMATICS IN THE RAWGAS OF WASTE INCINERATION PLANTS - CONCLUSIONS WITH REGARD TO DEDUSTING TECHNOLOGY

The findings obtained from sampling of chlorine aromatics by mechanica l separation of the dust phase in the raw gas of waste incineration pl ants demonstrate that a formation especially of polychlorinated dioxin s and chlorophenols takes place above 200 degrees C. This is mainly ca used by the fine dust. Furthermore, the filter materials were found to have some influence. Compared to PTFE filters, the use of quartz fibr e filters resulted in smaller concentrations of PCDD/F at higher tempe ratures. As a consequence of the results obtained, a threshold tempera ture of 200 degrees C must be observed for dedusting on a large techni cal scale both in fabric and electrofilters in order to avoid the form ation of chlorine aromatics.