Abstract

Emission characteristics of volatile organic compounds (VOCs) were investigated in the flue gas emitted from wood drying process for plywood manufacturing. The moisture content of raw timber was average 48%, and its density was $831.55kg/m^3$. But the moisture content of dried wood is needed less than around 10%, thus the moisture contents of flue gas should be remarkably high(about 18.2 V/V%). Therefore, the vapor in flue gas is equivalent to 320 ton-vapor/day when 1100 ton-wood/day is treated in the wood drying process. The temperature of flue gas ranges from $140^{\circ}C\;to\;150^{\circ}C$ in each dryer stack with exception of the input site of wood(about $110^{\circ}C$). The velocity of flue gas in each stack ranges from 1.7 to 9.7m/sec. In order to assess the concentrations and attribution rate of odorous compounds, it was analyzed about 40 VOCs in the flue gases. It was found that the major odorous compounds were 8 compounds, and the concentrations of major VOCs(ppm) were as follows; benzene: $0.054{\sim}0.052$, toluene: $1.011{\sim}2.547$, ethylbenzene: $0.472{\sim}2.023$, m,p-xylene: $0.504{\sim}3.245$, styrene: $0.015{\sim}0.148$, o-xylene : $0.271{\sim}1.097$, ethanol: $11.2{\sim}32.5$, ${\alpha}$-pinene: $0.908{\sim}10.578$, ${\beta}$-pinene: $0.982{\sim}14.278$. The attribution rate of terpenes (${\alpha}$-pinene, ${\beta}$-pinene) was about 60.56%, and that of aromatics and alcohols was about 22.77%, and 16.67%, respectively. It is suggested that the adequate control device should be used to control both the water soluble and non-soluble compounds because both compounds were mixed in flue gas.

Keywords

Plywood;Drying process;BTX(benzene, toluene, xylene);VOCs

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References

1. Bowyer J. M., Shmulsky R., Haygreen J. G., 2002, Forest products and wood science: an introduction, Iowa State Press, 554pp
2. 정희석, 2005, 최선목재건조학, 서울대학교 출판부, 481pp
3. 정희석, 2000, 목재의 특수건조, 서울대학교 출판부, 380pp
4. Dinwoodie J. M., 2000, Timber: Its nature and behaviour, 2nd ed., E & FN Spon, 272pp
5. Walker J. C. F., 1993, Primary wood processing: Principles and practice, Chapman & Hall, 612pp
6. Tsoumis G, 1991, Science and technology of wood: Structure, properties, utilization., Chapman & Hall, 400pp
7. Iwasaki Y., Ishiguro T., 1978, Measurement of odor by triangle odor bag method (I), Journal of Japan Society for Atmospheric Environment, 13(6), 34-39
8. Leonardos G., Kendall D., Barnard N., 1969, Odor threshold determination of 53 odorant chemicals, J. of APCA., 19(2), 91-95
9. Hellman T. M., Small F. H., 1974, Characterization of the odor properties of 101 petrochemicals using sensory method, J. of APCA., 24(10), 979-982
10. Dean J. A., 1979, Lange's Handbook of Chemistry, 12th ed., McGraw-Hill, New York, 7.54pp
11. Nagata Y., Takeuchi N., 1990, Measurement of Odor Threshold by Triangle Odor Bag Method, Bulletin of Japan Environmental Sanitation Center, 17, 77-89
12. 환경부, 2003, 대기오염공정시험방법, 111pp
13. 유미선, 양성봉, 안성주, 2002, 흡착열탈착 장치와 GC/MS를 이용한 휘발성 유기화합물의 분석과 악취원인성분의 예측, 분석과학, 15(1), 80-86
14. 환경부 대기보전국, 2007, 악취관리업무편람, 299pp

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