Microwave Torrefaction of Moist Municipal Solid Waste (MSW) Pellets with the Addition of Char from Agricultural Residues

Abstract:

An investigation of the effect of the addition of char from agricultural residues on the torrefaction of moist municipal solid waste (MSW) pellets (40 wt.% moisture) was carried out in a microwave oven (500-800 W for 4-12 minutes). Char from agricultural residues, including corncob, palm shell, straw, and bagasse, was used as the microwave absorbers to enhance the absorption of microwave irradiation. It was found that the addition of char from bagasse yielded the lowest remaining mass (or mass yield) and volatile matter (VM) content, but the highest temperature and heating value, of the torrefied MSW pellet. Moisture in the MSW pellet with or without the addition of microwave absorber was completely removed after being torrefied for 8-12 minutes. The VM contents remained in the MSW pellets with the addition of microwave absorbers were lower than that in the MSW pellet without the addition of microwave absorber. The addition of microwave absorbers led to an increase in carbon (C) content but a decrease in oxygen (O) content of the torrefied MSW pellets, compared to those of the raw MSW pellet. The heating values of the torrefied MSW pellets with the addition of microwave absorbers were equivalent to that of sub-bituminous coal, enhanced from that of the raw MSW pellet, which was lower than that of lignite.

• Periodical: Key Engineering Materials (Volume 757)
• Pages: 156-160
• DOI: https://doi.org/10.4028/www.scientific.net/KEM.757.156
• Online since: October 2017
• Authors: Prodpran Siritheerasas*, Phichayanan Waiyanate, Hidetoshi Sekiguchi, Satoshi Kodama
• Keywords: Agricultural Residue, Char, Microwave Irradiation, Municipal Solid Waste (MSW), Torrefaction

References

[1] J. Nithikul, O. Karthik, C. Visvanathan, Reject management from a Mechanical Biological Treatment plant in Bangkok, Thailand, Resources Conservation and Recycling 55 (2011), 417-422.

DOI: 10.1016/j.resconrec.2010.11.004

[2] T.L. Clapp, J.F. Magee II, R.C. Ahlert, D.S. Kosson, Municipal solid waste composition and the behavior of metals in incinerator ashes, Environmental Progress & Sustainable Energy 7 (2006), 22-30.

DOI: 10.1002/ep.3300070111

[3] K. Suksankraison, S. Patumsawad, B. Fungtammasan, Co-firing of Thai lignite and municipal solid waste (MSW) in a fluidised bed: Effect of MSW moisture content, Applied Thermal Engineering 30 (2010), 2693-2697.

DOI: 10.1016/j.applthermaleng.2010.07.020

[4] H.M.Z. Hossain, Q.H. Hossainb, M.U. Monira, T. Ahmeda, Municipal solid waste (MSW) as a source of renewable energy in Bangladesh, Renewable and Sustainable Energy Reviews 39 (2014), 35-41.

DOI: 10.1016/j.rser.2014.07.007

[5] D.Q. Zhang, S.K. Tan, R.M. Gersberg, Municipal solid waste management in China: Status, problems and challenges, Journal of Environment Management 91 (2010), 1623-1633.

DOI: 10.1016/j.jenvman.2010.03.012

[6] M.J.C. van der Stelt, H. Gerhauser, J.H.A. Kiel, K.J. Ptasinski, Biomass upgrading by torrefaction for the production of biofuels: A review, Biomass and Bioenergy 35 (2011), 3748-3762.

DOI: 10.1016/j.biombioe.2011.06.023

[7] H. Li, Y. Qu, Y. Yang, S. Chang, J. Xu, Microwave irradiation – A green and efficient way to pretreat biomass, Bioresource Technology 199 (2016), 34-41.

DOI: 10.1016/j.biortech.2015.08.099

[8] X. Liu, Z. Zhang, Y. Wu, Absorption properties of carbon black/silicon carbide microwave absorbers, Composites: Part B Engineering 42 (2011), 326-329.

DOI: 10.1016/j.compositesb.2010.11.009

[9] F.C. Borges, Z Du, Q Xie, J.O. Trierweiler, Y. Cheng, Y. Wan, Y. Liu, X. Lin, P. Chen, R. Ruan, Fast microwave assisted pyrolysis of biomass using microwave absorbent, Bioresource Technology 156 (2014), 267-274.

DOI: 10.1016/j.biortech.2014.01.038

[10] F. Mushtaq, R. Mat, F.N. Ani, Pyrolysis of solid palm waste biomass with microwave absorber under microwave irradiation, Applied Mechanics and Materials 606 (2014), 73-77.

DOI: 10.4028/www.scientific.net/amm.606.73

[11] D. Vamvuka, E. Kakaras, E. Kastanaki, P. Grammelis, Pyrolysis characteristics and kinetics of biomass residuals mixtures with lignite, Fuel 82 (2003), 1949-(1960).

DOI: 10.1016/s0016-2361(03)00153-4

[12] A.C. Metaxas, R.J. Meredith, Industrial Microwave Heating. London: Peter Peregrinus Ltd.; (1988).

[13] D.A. Tillman, The Combustion of Solid Fuels and Wastes. USA: Academic Press; (1991).

[14] S. Krerkkaiwan, C. Fushimi, A. Tsutsumi, P. Kuchonthara, Synergetic effect during co-pyrolysis/ gasification of biomass and sub-bituminous coal, Fuel Processing Technology 115 (2013), 11-18.

DOI: 10.1016/j.fuproc.2013.03.044