Metals recycling maps and allocation procedures in life cycle assessment

Goal, scope, and backgroundThe aim of this work is to present guidance on the application of ISO 14044 to allocation procedures for metal recycling. As such, graphical patterns of metal recycling and generic “rules” for metal recycling maps are presented. The results are intended to be useful in assessing and validating the suitability of allocation procedures for metal recycling in the context of life cycle assessment (LCA) and assist in the understanding of metals flow patterns in product systems. LCA uses a product-focus; therefore, the perspective here is on recycling metals in post-consumer products. The discussions, analysis, and illustrations in this paper emphasize old (post-consumer) scrap and do not detail flows of new (post-manufacturing, pre-consumer) or prompt (internal) scrap. The work included participation and review from International Council on Mining and Metals, the Nickel Institute, the International Copper Association, the International Zinc Association, worldsteel (formerly International Iron and Steel Institute), and the International Aluminium Institute.MethodsA survey of generic metal flows was conducted for three major non-ferrous metals—nickel, copper, and zinc. Based on the results of this survey, four metal recycling map models were developed. Implications of these recycling maps for LCA were then considered, and parameters necessary to model metal recycling were presented. Relationships of inherent properties and recycling loops are provided and connected to the allocation procedures in the context of LCA.Results and discussionFour metals recycling map models were generated based on a survey and analysis of current metals flow analysis. The utility of the recycling maps is to serve the basis of a structured approach to recycling allocation in life cycle assessment and leveraging the efforts of harmonized recycling metrics.ConclusionsA consensus on mapping metals is important in order to achieve an accurate understanding and measurement of metals recycling. To this end, consensus mapping presentation of a general allocation approach and identification of harmonized metrics were achieved among representatives of ferrous and non-ferrous metals groups.PerspectivesFor the future, allocation factors based on sound empirical data needs to be developed. Those metrics will empower the various stakeholders—industry, policy makers, non-governmental organizations, and academics to make appropriate decisions based on agreed scientific bases.

[1]  Yoshihiro Adachi,et al.  Application of Markov Chain Model to Calculate the Average Number of Times of Use of a Material in Society. An Allocation Methodology for Open-Loop Recycling. Part 2: Case Study for Steel (6 pp) , 2007 .

[2]  Olivier Bomsel,et al.  The recycling of non-ferrous metals , 1997 .

[3]  Pinar Erol,et al.  ECO-design of reuse and recycling networks by multi-objective optimization , 2005 .

[4]  Danilo Pelletiere,et al.  The Economics of Downcycling: An Overview with Illustration from the International Used Car Trade , 2001 .

[5]  Randolph Kirchain,et al.  Strategies for maintaining light metal reuse : Insights from modeling of firm-wide raw materials availability and demand , 2007 .

[6]  P. Georgiadis,et al.  Sustainability in electrical and electronic equipment closed-loop supply chains: A System Dynamics approach , 2008 .

[7]  Yoshihiro Adachi,et al.  Application of Markov Chain Model to Calculate the Average Number of Times of Use of a Material in Society. An Allocation Methodology for Open-Loop Recycling. Part 1: Methodology Development (7 pp) , 2006 .

[8]  Hans-Jürgen Dr. Klüppel,et al.  The Revision of ISO Standards 14040-3 - ISO 14040: Environmental management – Life cycle assessment – Principles and framework - ISO 14044: Environmental management – Life cycle assessment – Requirements and guidelines , 2005 .

[9]  Hans-Jürgen Dr. Klüppel,et al.  ISO 14041: Environmental management — life cycle assessment — goal and scope definition — inventory analysis , 1998 .

[10]  Robert U. Ayres,et al.  Sustainable Metals Management , 2006 .

[11]  R. Steinhilper,et al.  Remanufacturing-the key solution for transforming "downcycling" into "upcycling" of electronics , 2001, Proceedings of the 2001 IEEE International Symposium on Electronics and the Environment. 2001 IEEE ISEE (Cat. No.01CH37190).

[12]  Martin Ruhrberg,et al.  Assessing the recycling efficiency of copper from end-of-life products in Western Europe , 2006 .

[13]  Thomas E. Graedel,et al.  Making Metals Count: Applications of Material Flow Analysis , 2006 .

[14]  M. Reuter,et al.  Process Knowledge, System Dynamics, and Metal Ecology , 2004 .

[15]  J. Atherton.  Declaration by the Metals Industry on Recycling Principles , 2007 .

[16]  Robert B. Gordon,et al.  The Multilevel Cycle of Anthropogenic Zinc , 2005 .

[17]  Ernst Worrell.  Materials Matter, Towards a Sustainable Materials Policy , 2002 .

[18]  T. Ekvall.  A market-based approach to allocation at open-loop recycling , 2000 .

[19]  Ken Geiser.  Materials Matter: Toward a Sustainable Materials Policy , 2001 .

[20]  Robert U. Ayres,et al.  Sustainable metals management : securing our future - steps towards a closed loop economy , 2006 .

[21]  Robert J. Klee,et al.  Multilevel cycle of anthropogenic copper. , 2004, Environmental science & technology.

[22]  Pierre Desrochers,et al.  Market Processes and the Closing of ’Industrial Loops’ , 2000 .

[23]  T. Graedel,et al.  Metal stocks and sustainability , 2006, Proceedings of the National Academy of Sciences of the United States of America.