OPEN ACCESS
About 3.9 million tons of agricultural residue waste biomass such as rice husk and straw are stably produced from rice each year in Japan. It is reported that vapor pollutants and particles emitted from the burning of agricultural residue waste biomass such as waste rice husk and straw have serious influences on visibility, human health, and global climate. Therefore, it is necessary to utilize waste rice husk and straw effectively to reduce air pollution. In recent years, there has been an increasing demand for the effective utilization of waste agricultural residue biomass instead of fossil fuel in combustors for farming such as greenhouses heating during the winter season. However, there is a lack of regulations or laws to control air pollution from these small-size combustors in Japan. So far, small-size combustors have been characterized by their structural simplicity and low cost. Therefore, it is necessary to evaluate and control the emission of air pollutants such as fine particles (i.e. PM2.5 – particles below 2.5 µm in aerodynamic diameter) due to the poor combustion performance of small-size combustors.
In this study, it was investigated whether it would be possible to utilize biomass fuel selected from waste rice husk and straw of agricultural residue waste biomass based on the laboratory combustion experiments. The emission behavior of harmful suspended particulate matter produced from burning rice husk and straw was evaluated by measuring carbonaceous and ionic composition of PM2.5 in the exhaust gases. From the analytical results, it was found that particulate mass concentrations reduced substantially at high-temperature combustion. However, ionic compositions were increased with the increase in combustion temperature. It can be suggested that stable combustion should be performed under suitable conditions to control air pollutants emitted from biomass fuel, although small-size combustors are still not regulated to control PM2.5 emission.
Agricultural residue waste biomass, carbonaceous composition, combustion conditions, ionic composition, PM2.5, rice husk and straw, small size combustors
[1] Saidur, R., Abdelaziza, E.A., Demirbasb, A., Hossaina, M.S. & Mekhilef, S., A review on biomass as a fuel for boilers. Renewable and Sustainable Energy Reviews, 15, pp. 2262–2289, 2011.doi: http://dx.doi.org/10.1016/j.rser.2011.02.015
[2] Dong, L., Gao, S. & Xu, G., No reduction over biomass char in the combustion process. Energy Fuels, 24, pp. 446–450, 2010. doi: http://dx.doi.org/10.1021/ef900913p
[3] Hansen, L.A., Nielsen, H.P., Frandsen, F.J., Dam-Johansen, K., Horlyck, S. & Karlsson, A., Influence of deposit formation on corrosion at a straw-fired boiler. Fuel Processing Technology, 64, pp. 189–209, 2000. doi: http://dx.doi.org/10.1016/S0378-3820(00)00063-1
[4] Iliopoulou, E.F., Antonakou, E.V., Karakoulia, S.A., Vasalos, I.A., Lappas, A.A. & Triantafyllidis, K.S., Catalytic conversion of biomass pyrolysis producs by mesoporous materials: effect of steam stability and acidity of Al-MCM-41 catalysts. Chemical Engineering Journal, 134, pp. 51–57, 2007. doi: http://dx.doi.org/10.1016/j.cej.2007.03.066
[5] Johansson, L.S., Tullin, C., Leckner, B. & Sjovall, P., Particle emissions from biomass combus-tion in small combustors. Biomass and Bioenergy, 25, pp. 435–446, 2003. doi: http://dx.doi. org/10.1016/S0961-9534(03)00036-9
[6] Simoneit, B.R.T., Biomass burning-a review of organic tracers for smoke from incomplete combustion. Applied Geochemistry, 17, pp. 129–162, 2002. doi: http://dx.doi.org/10.1016/ S0883-2927(01)00061-0
[7] Wiinikka, H. & Gebart, R., Experimental investigation of the particle emissions from a small-scale pellets combustor. Biomass and Bioenergy, 27, pp. 645–652, 2004. doi: http:// dx.doi.org/10.1016/j.biombioe.2003.08.020
[8] Wang, Q., Itoh, S., Itoh, K., Apaer, P., Chen, Q., Niida, D., Mitsumura, N., Animesh, S., Sekiguchi, K. & Endo, T., Behavior of suspended particulate matter emitted from combustion of agricultural residue biomass under different temperatures. WIT Transactions on Ecology and the Environment, Vol. 176, Energy and Sustainability IV, eds. C.A. Brebbia, A.M. Marinov & C.A. Safta, WIT Press: Southampton, pp. 315–325, 2013.
[9] Oliver Chang, M.-C., Chow, J.C., Watson, J.G., Hopke, P.K., Yi, S.-M. & England, G.C., Measurement of ultrafine particle size distributions from coal-, oil-, and gas-fired stationary com-bustion sources. Journal of the Air & Waste Management Association, 54, pp. 1494–1505, 2004. doi: http://dx.doi.org/10.1080/10473289.2004.10471010
[10] Khan, A.A., de Jong, W., Jansens, P.J. & Spliethoff, H., Biomass combustion in fluidized bed boilers: potential problems and remedies. Fuel Processing Technology, 90, pp. 21–50, 2009. doi: http://dx.doi.org/10.1016/j.fuproc.2008.07.012
[11] Ward, D.E. & Hao, W.M., Air toxic emissions from burning of biomass globally-preliminary esti-mates. Proceedings of Air & Waste Management Assoc. 85th Annual Meeting & Exhibition, 1992.
[12] Kuo, L.-J., Louchouarn, P. & Herbert, B.E., Influence of combustion conditions on yields of solvent-extractable anhydrosugars and lignin phenols in chars: implications for characterizations of biomass combustion residues. Chemosphere, 85, pp. 797–805, 2011. doi: http://dx.doi. org/10.1016/j.chemosphere.2011.06.074
[13] Engling, G., Lee, J.J., Tasi, Y.-W., Lung, S.-C.C., Chou, C.C.-K. & Chan, C.-Y., Size-resolved Anhydrosugar composition in smoke aerosol from controlled field burning of rice straw. Aerosol Science and Technology, 43, pp. 662–672, 2009. doi: http://dx.doi. org/10.1080/02786820902825113
[14] Hays, M.D., Fine, P.M., Geron, C.D., Kleeman, M.J. & Gullett, B.K. Open burning of agri-cultural biomass: physical and chemical properties of particle-phase emissions. Atmospheric Environment, 39, pp. 6747–6764, 2005. doi: http://dx.doi.org/10.1016/j.atmosenv.2005.07.072
[15] Jones, J.M., Darvell, L.I., Bridgeman, T.G., Pourkashanian, M. & Williams, A., An investigation of the thermal and catalytic behavior of potassium in biomass combustion. Proceedings of the Combustion Institute, 31, pp. 1955–1963, 2007. doi: http://dx.doi.org/10.1016/j.proci.2006.07.093
[16] Wang, Q., Maezono, T., Apaer, P., Chen, Q., Gui, L., Itoh, K., Kurokawa, H., Sekiguchi, K., Sugi-yama, K., Niida, H. & Itoh, S., Characterization of suspended particulate matter emitted from waste rice husk as biomass fuel under different combustion conditions. WIT Transactions on Ecology and the Environment, Vol. 176, Air Pollution XX, WIT Press: Southampton, pp. 365–376, 2012.