Catalytic effects of fly ash from waste incineration facilities on the formation and decomposition of polychlorinated dibenzo-p-dioxins and polychlorinated dibenzofurans

Journal Article · Sun Nov 01 04:00:00 EST 1987 · Environ. Sci. Technol.; (United States)

DOI:https://doi.org/10.1021/es00164a006· OSTI ID:5002073

Hagenmaier, H; Kraft, M; Brunner, H; Haag, R

The thermal behavior of polychlorinated dibenzo-p-dioxins (PCDD) and polychlorinated dibenzofurans (PC-DF) on electrostatic precipitator ash (fly ash) from waste incinerators was studied at 300/sup 0/C under oxygen deficient and oxygen surplus conditions. Under oxygen deficient conditions a dechlorination/hydrogenation reaction is observed that is catalyzed by fly ash. The addition of octaCDD and octaCDF to fly ash and subsequent heat treatment lead to the formation of mono- to heptaCDD/CDF. Under oxygen surplus conditions as increase in PCDD and PCDF is obtained as first described by Vogg and Stieglitz. On the basis of evidence presented, a mechanism for this fly ash catalyzed reaction is proposed, which starts with the formation of chlorine from metal chlorides and leads finally to a de novo synthesis of PCDD and PCDF. The findings reported will have consequences for the interpretation of PCDD/PCDF formation and decomposition in waste incineration facilities and will aid in minimizing PCDD and PCDF emission from such facilities.

• Research Organization: Univ. of Tuebingen (West Germany)
• OSTI ID: 5002073
• Journal Information: Environ. Sci. Technol.; (United States), Journal Name: Environ. Sci. Technol.; (United States) Vol. 21:11; ISSN ESTHA
• Country of Publication: United States
• Language: English

Related Subjects

500200* -- Environment
Atmospheric-- Chemicals Monitoring & Transport-- (-1989)
54 ENVIRONMENTAL SCIENCES
AEROSOL WASTES
AIR POLLUTION
ASHES
BENZOFURANS
CATALYTIC EFFECTS
CHEMICAL REACTIONS
COMBUSTION
DATA
DECOMPOSITION
DIOXIN
EXPERIMENTAL DATA
FLY ASH
FURANS
HETEROCYCLIC COMPOUNDS
INCINERATORS
INFORMATION
MUNICIPAL WASTES
NUMERICAL DATA
ORGANIC COMPOUNDS
ORGANIC OXYGEN COMPOUNDS
OXIDATION
POLLUTION
RESIDUES
SYNTHESIS
THERMOCHEMICAL PROCESSES
WASTES