Emissions from western hemlock lumber during drying
2006
Milota, M.R. | Mosher, P.
Large amounts of western hemlock lumber are dried in the U.S. Pacific Northwest and western Canada, often at a high temperature. Methanol and formaldehyde emissions from western hemlock are not known, making it difficult for mills to comply with permit requirements and clean air laws. Methanol, formaldehyde, and total hydrocarbon emissions were measured during the drying of western hemlock dimension lumber at various temperatures and for wood harvested during different seasons and locations. Methanol emissions ranged from 0.03 to 0.24 pounds per 1,000 board feet (lb/MBF) (0.007 to 0.06 kg/m3). Formaldehyde emissions ranged from 0.001 to 0.004 lb/MBF (0.0003 to 0.001 kg/m3). Total hydrocarbon emissions (as carbon) ranged from 0.1 to 0.7 lb/MBF (0.02 to 0.17 kg/m3). Temperature and initial moisture content are likely factors affecting emissions; however, there was considerable variability that could not be accounted for by only these factors. Seasonal variability and log or lumber storage conditions may cause some of the variability.
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