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Formation of polychlorinated dibenzo-p-dioxins (PCDD) and polychlorinated dibenzofurans (PCDF) during the combustion of impregnated wood
1995 - IRG/WP 95-50040-19
Wood waste and industrial wood residues often contain various preservatives. The waste management for these residuals can be recycling, deposition or combustion. Among the three possibilities, combustion seems to be the most efficient way of disposal. To obtain detailed information about emissions of organic compounds with environmental impact, especially polychlorinated dibenzo-p-dioxins (PCDD) and furans (PCDF), different impregnated wood materials were incinerated in two furnaces after mixing with non-treated wood in a ratio of 1:4. The combustion process of residues containing organic or inorganic preservatives is influenced by the elementary composition of the preservative and the thermal and oxidative reaction paths in the flame. It was found that the concentrations of PCDD and PCDF in the exhaust gas can be kept low under good combustion conditions. However, a non-regular incineration process strongly supports increased emissions of PCDD and PCDF.
T Salthammer, H Klipp, R-D Peek
Wood preservation in Canada - Regulation and Registration
2001 - IRG/WP 01-50166-02
The Canadian wood preservation industry is at a critical juncture now as a number of initiatives converge on the industry over the next few years. Issues facing the industry include: Re-evaluation of the conventional wood preservative chemicals - inorganic arsenicals, creosote and pentachlorophenol targeted for July 2001. Delayed registration of new actives as a result of re-evaluation activity and priority. ?Implementation of the Environment Canada "Strategic Options" recommendations for preservative components considered "toxic" under the Canadian Environmental Protection Act, including hexavalent chromium, arsenic, PAH contaminated wastes, benzene hexachloride, dioxins and furans. Updating of the Technical Recommendation Documents for the design and operation of wood treating plants (now complete). The backgrounds, implementation, interactions and impacts of these initiatives on the Canadian Wood Preservation Industry are discussed.
P A Cooper