Emission of volatile organic compounds during drying of veneer: Red meranti (Shorea sect. Rubroshorea), larch (Larix sp.), and sugi (Cryptomeria japonica D. Don)
2009
Ishikawa, A.(Forestry and Forest Products Research Inst., Tsukuba, Ibaraki (Japan)) | Ohira, T. | Miyamoto, K. | Inoue, A. | Ohkoshi, M.
Estimation of the amount of volatile organic compounds (VOCs) emitted from the wood-based material industry has become an urgent matter following the 2004 amendment of the Air Pollution Control Law to prevent air pollution from suspended particulate matter (SPM) and photochemical oxidants by controlling VOC emission from factories. At the same time, aldehyde emission from wood products has raised concerns over its effect on human health. In this study, emissions of VOCs and aldehydes during veneer drying were estimated. Wood species commonly used for veneer, red meranti (Shorea sect. Rubroshorea), larch (Larix sp), and sugi (Cryptomeria japonica D. Don), were dried at 140-180degC, and the discharged air was analyzed by high-performance liquid chromatography (HPLC) and gas chromatography/mass spectroscopy (GC/MS). The emissions of VOCs and aldehydes increased with increasing temperature for all three species. Emissions from sugi wood were higher than from the other species, likely because of the longer drying time due to its high moisture content. The dominant compounds in the discharged air were terpenes. Moreover, discharged amounts of VOCs and aldehydes from the industrial drying process were estimated using the experimental data obtained in this study. These results can be of help in a voluntary approach by the wood-product industry to establish effective emission control of VOCs and aldehydes.
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