Bk. Gullett et K. Raghunathan, OBSERVATIONS ON THE EFFECT OF PROCESS PARAMETERS ON DIOXIN FURAN YIELD IN MUNICIPAL WASTE AND COAL SYSTEMS/, Chemosphere, 34(5-7), 1997, pp. 1027-1032
Effects of fly ash loading; ash-borne, extractable organics; sulfur di
oxide (SO,) and hydrogen chloride (HCI) concentration; and combustion
quality on the formation of polychlorinated dibenzo-p-dioxin and polyc
hlorinated dibenzofuran (PCDD/F) were evaluated in pilot scale tests s
imulating municipal waste combustion and coal/waste co-combustion test
ing. Similar PGDD/F yields from reinjection of as-received and extract
ed fly ash injection along with testing under ''poor combustion'' cond
itions show the importance of combustion quality on minimizing precurs
ors. Go-firing coal and municipal solid waste ash leads to increased f
ormation from that of firing coal alone, indicating that the municipal
solid waste ash provides additional reactants and/or catalytic sites
for formation. Finally, tests with elevated SO, levels found that, at
sufficiently high sulfur/chlorine levels, formation of PCDD/F is preve
nted in both simulated municipal waste combustion and coal/waste co-fi
ring. Published by Elsevier Science.