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In Chile, during the last 40 years the municipal solid waste (msW) generation rate has shown a 4-fold increase due to population growth, fast urbanization and improved material standards. as in most developing countries, this trend is expected to continue as economic policies foster greater industrial investment and increases in domestic consumption.
Currently, msW are landfilled near ever expanding urban areas, leading to growing public concerns, and prompting new control legislation. up-to-date msW management practises are being promoted in order to maximise waste valorisation, including recycling, and waste-to-energy, within a circular economy strategy. However, new resource consumption, waste streams, air emissions and effluents may arise when changing from a linear to a circular economy model. Therefore, environmental performance of alternative scenarios must take into consideration the complete life cycle to avoid problem shifting. Within this context, this paper presents a case study of three alternative waste-to energy scenarios, as part of a circular economy strategy, involving combustion, gasification, and landfill biogas, at the Bio Bio region in southern Chile. This is an industrial region housing over 2 million inhabitants and generating more than one million tonnes of msW per year. The study assesses waste-to energy alternatives considering an integrated waste management life cycle approach. Boundaries include waste collection, transport, pre-treatment processes, by-products generation, and heat/power production. msW transport, recycling rates, chemical compositions, and calorific values, were obtained from primary sources, whereas energy conversion efficiencies and other data gaps were estimated from the ecoinvent database. results provide a complete view of the environmental performance of each alternative scenario, including potential climate change effects and other environmental impacts, and also the positive contributions of material and energy recovery. This work illustrates the value of life cycle assessment in the context of decision making concerning circular economy scenarios.
biogas, electricity generation, gasification, Incineration, life cycle assessment, Municipal solid waste, waste-to-energy
[1] Palmiotto, M., Fattore, E., Paiano, V., Celeste, G., Colombo, A. & Davoli, E., Influence of a municipal solid waste landfill in the surrounding environment: toxicological risk and odor nuisance effects. Environment International, 68, pp. 16–24, 2014.
[2] Fernandez-González, J.M., Grindlay, A.L., Serrano-Bernardo, F., Rodriguez-Rojas, M.I. & Zamorano, M., Economic and environmental review of waste-to energy systems for municipal solid waste management in medium and small municipalities. Waste Management, 67, pp. 360–374, 2017.
[3] Arafat, H.A., Jijakli, K. & Ahsan, A., Environmental perdormance and energy recovery potenctial of five processes for municipal solid waste treatment. Journal of Cleaner Production, 105, pp. 233–240, 2015.
[4] Bosmans, A. & Helsen, L., Energy from Waste: Review of thermochemical technologies for refuse derived fuel (RDF) treatment. Proceedings Venice 2010, Third International Symposium on Energy from Biomass and Waste,Venice, Italy, pp. 8–11, November 2010.
[5] Leckner, B., Process aspects in combustion and gasification Waste-to-Energy (WtE) units. Waste Management, 37, pp.13–25, 2015.
[6] Panepinto, D., Tedesco, V., Brizio, E. & Genon, G., Environmental performances and energy efficiency for MSW gasification treatment. Waste Biomass Valor, 6, pp. 123–135, 2015.
[7] Lee, U., Chung, J.N. & Ingley, H.A., High-temperature steam gasification of municipal solid waste, rubber, plastic and wood. Energy Fuels, 28(7), pp. 4573–4587, 2014.
[8] Chen, D., Yin, L., Wang, H. & He, P., Pyrolysis technologies for municipal solid waste: A review. Waste Management, 37, pp. 116–136, 2015.
[9] Wang, H., Wang, L. & Shahbazi, A., Life cycle assessment of fast pyrolysis of municipal solid waste in North Carolina of USA. Journal of Cleaner Production, 87, pp. 511–519, 2015.
[10] Akolkar, A.B., Choudhury, M.K. & Selvi, P.K. Assessment of methane emission from municipal solid wastes disposal sites. Research Journal of Chemistry and Environment, 24(4), pp. 49–55, 2008.
[11] Ahmed, S.I., Johari, A., Hashim, H., Lim, J.S., Jusoh, M., Mat, R. & Alkali, H., Economic and environmental evaluation of landfill gas utilisation: A multi-period optimisation approach for low carbon regions. International biodeterioration & biodegradation, 102, pp. 191–201, 2015.
[12] Broun, R. & Sattler, M., A comparison of Greenhouse Gas Emissions and potential electricity recovery from conventional and bioreactor landfills. Journal of Cleaner Production, 112, pp. 2664–2673, 2016.
[13] Gökçek, M. Waste to energy: exploitation of landfill gas in micro turbines. Journal of Engineering Sciences, 6(2), pp. 710–716, 2017.
[14] Astrup, T.F., Tonini, D., Turconi, R. & Boldrin, A., Life cycle assessment of thermal Waste-to-Energy technologies: Review and recommendations. Waste Management, 37, pp. 104–115, 2015.
[15] Ayodele, T.R., Ogunjuyigbe, A.S.O. & Alao, M.A., Life cycle assessment of wasteto-energy (WtE) technologies for electricity generation using municipal solid waste in Nigeria. Applied Energy, 201, pp. 200–218, 2017.
[16] Lee, U., Han, J. & Wang, M. Evaluation of landfill gas emissions from municipal solid waste landfills for the life-cycle analysis of waste-to-energy pathways. Journal of Cleaner Production, 166, pp. 335–342, 2017.
[17] Karlsson, J., Brunzell, L. & Venkatesh, G., Material flow analysis, energy analysis, and partial environmental LCA of a district heating combined heat and power plant in Sweden. Energy, 144, pp. 31–40, 2018.
[18] Bidart, C., Fröhling, M. & Schultmann, F., Municipal solid waste and production of substitute natural gas and electricity as energy alternatives. Applied Thermal Engineering, 51(1–2), pp. 1107–1115, 2013.
[19] ISO 14.040. Environmental management—Life cycle assessment—Principles and framework. International Organization for Standardization, Geneve, Switzerland, 2006.
[20] ISO 14.044. Environmental management—Life cycle assessment—Requirements and guidelines. International Organization for Standardization, Geneve, Switzerland, 2006.
[21] NCh. 3321. Norma Chilena 3321: Caracterización de residuos sólidos municipales. Instituto Nacional de Normalización, Santiago, Chile. 2012.
[22] ASTM D5231-92(2008). Standard test method for determination of the composition of unprocessed municipal solid waste. ASTM International, West Conshohocken, PA, 2008.
[23] ASTM E790-87(2004). Standard test method for residual moisture in a refuse-derived fuel analysis sample. ASTM International, West Conshohocken, PA, 2004.
[24] ASTM E830-87(1996). Standard test method for ash in the analysis sample of refusederived fuel. ASTM International, West Conshohocken, PA, 1996.
[25] ASTM E897-88(2004). Standard test method for volatile matter in the analysis sample of refuse-derived fuel. ASTM International, West Conshohocken, PA, 2004. www.astm.org
[26] BS EN 14918. Solid biofuels. Determination of calorific value, 2009.
[27] BS EN ISO 16948: 2015 Solid biofuels. Determination of total content of carbon, hydrogen and nitrogen, 2015.
[28] EPA. Landfill Gas Emissions Model (LandGEM) Version 3.02. EPA-600/R-05/047. U.S. Environmental Protection Agency. Office of Research and Development, Washington, DC 20460, 2005.
[29] Finnveden, G., Hauschild, M.Z., Ekvall, T., Guinée, J., Heijungs, R. & Hellweg, S., Recent developments in life cycle assessment. Journal of Environmental Management, 91(1), pp. 1–21, 2009.
[30] Guinée, J.B., Gorrée, M., Heijungs, R., Huppes, G., Kleijn, R. & Koning, A.D., Handbook on life cycle assessment. Operational guide to the ISO standards. I: LCA in perspective. IIa: Guide. IIb: Operational annex. III: Scientific background. Kluwer Academic Publishers, ISBN 1-4020-0228-9, Dordrecht, 2002.
[31] PRé Consultants. SimaPro 7.3.3. Pré Consultants, Amersfoort, the Netherlands. 2009.
[32] Environmental Impact Declaration. Planta Bio Energia Los Pinos. Presented to the Chilean Environmental Impact Assessment Service in August 2017. http://seia.sea.gob.cl/documentos/documento.php?idDocumento=2132658505 (accessed 12 September 2017).
[33] Tchobanoglous, G., Theisen, H. & Vigil, S., Integrated Solid Waste Management Engineering Principles and Management Issues, McGraw-Hill, Inc.: Singapore, 1993.