Developing a systematic framework for consistent allocation in LCA

  • Dieuwertje L. Schrijvers
  • Philippe Loubet
  • Guido Sonnemann
LCI METHODOLOGY AND DATABASES

Abstract

Purpose

Multifunctionality in life-cycle assessment (LCA) is solved with allocation, for which many different procedures are available. Lack of sufficient guidance and difficulties to identify the correct allocation approach cause a large number of combinations of methods to exist in scientific literature. This paper reviews allocation procedures for recycling situations, with the aim to identify a systematic approach to apply allocation.

Methods

Assumptions and definitions for the most important terms related to multifunctionality and recycling in LCA are given. The most relevant allocation procedures are identified from literature. These procedures are expressed in mathematical formulas and schemes and arranged in a systematic framework based on the underlying objectives and assumptions of the procedures.

Results and discussion

If the LCA goal asks for an attributional approach, multifunctionality can be solved by applying system expansion—i.e. including the co-functions in the functional unit—or partitioning. The cut-off approach is a form of partitioning, attributing all the impacts to the functional unit. If the LCA goal asks for a consequential approach, substitution is applied, for which three methods are identified: the end-of-life recycling method and the waste mining method, which are combined in the 50/50 method. We propose to merge these methods in a new formula: the market price-based substitution method. The inclusion of economic values and maintaining a strict separation between attributional and consequential LCA are considered to increase realism and consistency of the LCA method.

Conclusions and perspectives

We identified the most pertinent allocation procedures—for recycling as well as co-production and energy recovery—and expressed them in mathematical formulas and schemes. Based on the underlying objectives of the allocation procedures, we positioned them in a systematic and consistent framework, relating the procedures to the LCA goal definition and an attributional or consequential approach. We identified a new substitution method that replaces the three existing methods in consequential LCA. Further research should test the validity of the systematic framework and the market price-based substitution method by means of case studies.

Keywords

Allocation Consistency End-of-life recycling Multifunctionality Product environmental footprint Recovery Substitution 

Notes

Acknowledgments

We acknowledge Solvay and the French National Association for Technical Research (CIFRE Convention N° 2013/1146) for the funding of the PhD study of the first author and for their contributions to this paper. We thank Koen van Woerden for solving the first-order linear recurrence relation. Finally, we thank Bo Weidema and the two anonymous reviewers for their useful and important feedback, which has greatly improved the quality of the paper.

Compliance with ethical standards

Conflict of interest

The authors declare that they have no conflict of interest.

Supplementary material

11367_2016_1063_MOESM1_ESM.pdf (583 kb)
ESM 1 (PDF 583 kb)

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Copyright information

© Springer-Verlag Berlin Heidelberg 2016

Authors and Affiliations

  • Dieuwertje L. Schrijvers
    • 1
    • 2
  • Philippe Loubet
    • 3
  • Guido Sonnemann
    • 1
    • 2
  1. 1.Université de Bordeaux, ISM, UMR 5255TalenceFrance
  2. 2.CNRS, ISM, UMR 5255TalenceFrance
  3. 3.Bordeaux INP - ENSCBP, ISM, UMR 5255PessacFrance

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