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Our planet has limited resources, and due to our increasing demands on a variety of products, we rely on the availability of primary and secondary resources. This paper will give an overview on the required information received from processing secondary resources. It is possible to assess the quality of the generated material flows with this information. By describing the material characteristics and the material flow uncertainties, a forecast of the material’s future potential to replace primary resources may be possible. Future prospects of the quality of secondary resources, including their input and output properties may be helpful to assess their potential to substitute primary resource for example. It is the contribution of the paper to point out the necessity of know-ing the whole life cycle of a product to gain the best available end-of-life option. The case study of scrap tire recycling gives an example of assessing the material’s properties. Modeling recycling processes offers the potential of identifying the processing steps with regard to the main material flows and emissions to reduce the environmental impact and improve the economics. Material flow analysis and life cycle assessment can support the determination of the future potential of waste streams entering the recycling process. Some material flows are appropriate to replace primary resources without loss of quality. But other materials are only useful for products with minor quality. Some materials are made to never separate by itself, and therefore pure material flows are impossible to achieve. A model that considers different material properties of material flows helps to evaluate the global recycling potential. Therefore, material qualities have to be defined to make an assessment of sustainable management of secondary resources possible. A concept of developing a model that addresses this issue is presented in this paper. The aim of the model is to predict secondary material flows that are of equal quality of primary material flows. These material flows are then suitable to substitute primary resources which results in global savings in resources, both material and energy.
Life cycle assessment, material flow analysis, scrap tires, sustainability, uncertainty
[1] Commission of the European Communities. The raw material initiative – meeting our critical needs for growth and jobs in Europe, Communication from the Commission to the European Parliament and the council, COM (2008) 699, Brussels, Belgium, 2008.
[2] Ziemann, S., Schippl, J., Grunwald, A. & Schebek, L., Verfügbarkeit knapper metallischer Rohstoffe und innovative Möglichkeiten zu ihrer Substitution. Rohstoffeffizienz und Rohstof-finnovationen, Fraunhofer Verlag: Stuttgart, Germany, 2010.
[3] Angerer, G., Erdmann, L., Marscheider-Weidemann, F., Scharp, M., Lüllmann, A., Handke, V. & Marwede, M., Rohstoffe für Zukunftstechnologien – Einfluss des branchenspezifischen Rohst-offbedarfs in rohstoffintensiven Zukunftstechnologien auf die zukünftige Rohstoffnachfrage. ISI-Schriftenreihe “Innovationspotenziale”; Fraunhofer IRB: Stuttgart, Germany, 2009.
[4] EPA (9). Sustainable materials management: The road ahead (report and appendix – technical support document, Washington DC: EPA, available at www.epa.gov/epawaste/inforesources/ pubs/vision.htm (accessed February 2010).
[5] Hagelüken, C. & Meskers, C.E.M., Mining our computers – opportunities and challenges to recover scarce and valuable metals from end-of-life electronic devices. Proceedings of Elec-tronics Goes Green 2008+, eds H. Reichel, N.F. Nissen, J. Müller & O. Duebzer, Fraunhofer IRB: Stuttgart, Germany, 2008.
[6] EPIC-Environment and Plastics Industry Council and CSR-Corporations Supporting Recy-cling. Integrated Solid Waste Managements Tools: “Measuring the Environmental Perfor-mance of Waste Management Systems”. October 2000.
[7] Fava, J.A., Jensen, A.A., Lindfors, L., Pomper, S., de Smet, B., Warren, J. & Vigon, B., Life Cycle Assessment Data Quality. A Conceptual Framework. Society of Environmen-tal Toxicology and Chemistry & SETAC Foundation for Environmental Education, Inc.: Washington, DC, 1994.
[8] Pennington, D.W., Potting, J., Finnveden, G., Lindeijer, E., Jolliete, O., Rydberg, T. & Rebitzer, G., Life cycle assessment part 2: current impact assessment practice. Environment International, 30, pp. 721–739, 2004. doi: http://dx.doi.org/10.1016/j.envint.2003.12.009
[9] IFU Hamburg GmbH, Germany Umberto 5 Software, Version 5.5, 2010.
[10] Brunner, P. & Rechberger, H., Practical Handbook of Material Flow Analysis. Advanced Methods in Resource and Waste Management. Lewis Publishers: Boca Raton, USA, 2003. doi: http://dx.doi.org/10.1201/9780203507209
[11] Binder, C.R., van der Voet, E. & Rosselot, K.S., Implementing the results of material flow anal-ysis. Journal of Industrial Ecology, 13(5), pp. 643–649, 2009. doi: http://dx.doi.org/10.1111/ j.1530-9290.2009.00182.x
[12] Pehlken, A. & Mueller, D.H., Using information of the separation process of recycling scrap tires for process modelling. Resources, Conservation and Recycling, 54, pp. 140–148, 2009; Available at http://dx.doi.org/10.1016/j.resconrec.2009.07.008
[13] Bringezu, S. & Bleischwitz, R., Sustainable Resource Management: Global Trends, Visions and Policies, Greenleaf Publishing Ltd: Sheffield, UK, 2009.
[14] Salhofer, S., Wassermann, G. & Binner, E., Strategic environmental assessment as a participa-tory approach environmental planning: experiences from a case study in waste management. Complexity and Integrated Resources Management. iEMSs 2004 International Congress. In: C. Pahl-Wostl, S. Schmidt, T. Jakeman (Hrsg.), International Environmental Modelling and Software Society: Osnabrueck, Germany, 2004.
[15] Pehlken, A. & Thoben, K.-D., Contribution of Recycling Processes to Sustainable Resource Management. 18th CIRP International Conference n Life Cycle Engineering (LCE 2011), Braunschweig, Germany, 2011.
[16] Ekvall, T., Assefa, G., Björklund, A., Eriksson, O. & Finnveden, G., What life cycle assess-ment does and doesn’t do in assessments of waste management. Waste Management, 25(3). pp. 263–269, 2007.
[17] Fatta, D. & Moll, S., Assessment of information related to waste and material flows – a catalogue of methods and tools. technical report 96 of the European Environment Agency: Copenhagen, 2003.
[18] Hashimoto, S. & Mariguchi, Y., Proposal of six indicators of material cycles for describing society’s metabolism: from the viewpoint of material flow analysis. Resources Conservation and Recycling, 40, pp. 185–200, 2004. doi: http://dx.doi.org/10.1016/S0921-3449(03)00070-3
[19] Wdk, Wirtschaftsverband der deutschen Kautschukindustrie (Organisation of the German manufacturers of tyres and technical elastomers products), personal information, 2003.
[20] Dunn, JR. & Jones, RH., Automobile and truck tires adapt to increasingly stringent require-ments. Elastomerics, 123(7), pp. 11–18, 1991.
[21] www.rma.org (accessed November 2011).
[22] Rubber Association of Canada, available at www.rubberassociation.ca (accessed December 2011).
[23] Pehlken, A., Decker, A., Müller, D.H., Thoben, K.D., Todt, S. & Rolbiecki, M., Modellierung von Stoffstromeigenschaften im recycling. Müll und Abfall, S, pp. 386–391. 08/2009.
[24] Braungart, M. & McDonough, W., Cradle to Cradle. Remaking the Way We Make Things, North Point Press: New York, 2002.
[25] Fiksel, J., Bakshi, B.R., Baral, A., Guerra, E. & DeQuervain, B., Comparative life cycle assessment of beneficial applications for scrap tires. Clean Technologies and Environmental Policy, 13(1), pp. 19–35, 2010. doi: http://dx.doi.org/10.1007/s10098-010-0289-1
[26] Clauzade, C., Osset, PH., Hugrel, CH., Chappert, A., Durande, M. & Palluau, M., Life cycle assessment of nine recovery methods for end-of-life tyres. International Journal of Life Cycle Assessment, 15, pp. 883–892, 2010. doi: http://dx.doi.org/10.1007/s11367-010-0224-z
[27] Beukering, P.J.H. & Janssen, M.A., A dynamic integrated analysis of truck tires in West-ern Europe. Journal of Industrial Ecology, 4(2), pp. 93–115, 2000. doi: http://dx.doi.org/ 10.1162/108819800569825
[28] Genan Business; Comparative Life Cycle Assessment of two options for waste tyre treatment: material recycling vs. Co-incineration in cement kilns, Company report, available at http:// www.genan.eu/life_cycle_assessment-91.aspx, Denmark, 2009.
[29] Pahl, G. & Beitz, W., Konstruktionslehre – Methoden und Anwendung, Springer: Heidelberg, Germany, 1993. doi: http://dx.doi.org/10.1007/978-3-662-08164-8
[30] Heijungs, R. & Huijbregts, M.A.J., A review of approaches to treat uncertainty in LCA. iEMS Conference Proceedings: Complexity and Integrated Resources Management. Osnabrueck. Germany, 2004.
[31] Notten, P. & Petrie, J., An Integrated Approach to Uncertainty Assessment in LCA, Interna-tional Workshop on LCI-Quality: Karlsruhe. Germany, 2003.
[32] Clyde, M., & George, E.I., Model uncertainty. Statistical Science, 19(1), pp. 81–94, 2004. doi: http://dx.doi.org/10.1214/088342304000000035
[33] Arco, L., Bonet, I., Marx Gómez, J. & Rautenstrauch, R., A new approach to solve data defects in material flow networks. Proceedings of 19th International Symposium on Environmental Informatics – Networking Environmental Information – EnviroInfo, ed. J. Hrebizek, Brno, (Czech Republic), pp. 724–731, 2005.
[34] Hilera, J., Redes Neuronales Artificiales: Fundamentos, Modelos y Aplicaciones, Ed. Addison Wesley: Iberoamericana, 1995.
[35] Yu, X., Chen, G. & Cheng, S., Dynamic learning rate optimization of the backpropagation algorithm. IEEE Transaction on Neural Networks, 6(3), pp. 669–677, 1995. doi: http://dx.doi. org/10.1109/72.377972
[36] Li, X. &Yu, W., Dynamic knowledge inference and learning under adaptive fuzzy Petri net framework. IEEE Transactions on Systems, Man, and Cybernetics – Part C: Applications and Reviews, 30(4), pp. 442–450, 2000. doi: http://dx.doi.org/10.1109/5326.897071