FORMATION OF POLYCHLORINATED DIBENZO-p-DIOXINS AND DIBENZOFURANS FROM PENTACHLOROPHENOL ON FLY ASH SURFACE
Pentachlorophenol (PCP) spiked into fly ash were thermally treated under different conditions in a tubular furnace.The levels and profiles of polychlorinated dibenzo-p-dioxins and dibenzofurans (PCDD/Fs) produced from that were studied.PCDD/Fs existed in the gas phase mainly.The fraction of PCDDs was higher than that of PCDFs and the major homologues were HxCDD, HpCDD and OCDD.The effects of fly ash levels and oxygen content on the formation of PCDD/Fs were investigated.The levels of PCDD/Fs increased with the increase of fly ash.The levels of PCDD/Fs and I-TEQ value were lowest when the oxygen content in the gas stream was 6.7%.In addition, the mass balances of PCDD/Fs were presented.