Formation of chlorinated dioxins during production of bleached kraft pulp from sawmill chips contaminated with polychlorinated phenols
- Paprican, Pointe Claire, Quebec (Canada)
Until recently, sawmills used polychlorinated phenol (polyCP) formulations to prevent sap-staining of undried lumber. Bleached kraft pulp mills that used chips from polyCP-treated lumber were found to have elevated levels of hexachlorinated dioxins (hexaCDD) in their pulps, effluents, and sludges. This report presents the results of an investigation to elucidate the mechanism of hexaCDD formation during kraft pulping of polyCP-contaminated sawmill chips. The major constituents of the polyCP formulations- tetraCP and pentaCP-play a negligible role in hexaCDD formation. Polychlorinated phenoxyphenol (polyCPP) contaminants in the polyCP formulations are the key contributing factors, with hexaCDD contamination occurring as a consequence of digester-mediated condensation of polyCPP (i.e., predioxin) contaminants.
- OSTI ID:
- 6350378
- Journal Information:
- Tappi Journal; (United States), Journal Name: Tappi Journal; (United States) Vol. 76:3; ISSN TAJODT; ISSN 0734-1415
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
320305* -- Energy Conservation
Consumption
& Utilization-- Industrial & Agricultural Processes-- Industrial Waste Management
54 ENVIRONMENTAL SCIENCES
540220 -- Environment
Terrestrial-- Chemicals Monitoring & Transport-- (1990-)
AROMATICS
CHEMICAL REACTION KINETICS
CONTAMINATION
DIOXIN
DISPERSIONS
HETEROCYCLIC COMPOUNDS
HYDROXY COMPOUNDS
INDUSTRY
KINETICS
MIXTURES
ORGANIC CHLORINE COMPOUNDS
ORGANIC COMPOUNDS
ORGANIC HALOGEN COMPOUNDS
ORGANIC OXYGEN COMPOUNDS
PAPER INDUSTRY
PHENOLS
PRODUCTION
REACTION KINETICS
SLURRIES
SOLID WASTES
SUSPENSIONS
SYNTHESIS
WASTES
WOOD PRODUCTS INDUSTRY
WOOD WASTES