Impact distribution methods’ use in multifunctional Life Cycle Assessments: a systematic literature review

摘要: Partitioning loads related to multifunctional processes, which generate more than one product or service (i.e. function), is a controversial issue within life cycle assessment (LCA). ISO 14044:2006 suggests hierarchic stepwise procedure. The first step avoid allocation whenever possible, through (i) subdividing the process into unitary sub-processes with specific function; (ii) expanding system boundaries include additional functions by-product(s). second determines that system’s inputs and outputs must be allocated based on fundamental physical relationship between products. When unable identify such relationship, flows partitioned as reflect other relations products, their economic value. This paper aims delineate scientific overview of impact distribution methods’ use LCA practice from 2006 2016. Authors performed systematic literature review documented choice frequency studies published in considered time frame. Results revealed lack consensus among practitioners. Most papers adopt avoided burden approach (equivalent expansion), while proposed 14044’s hierarchy (subdivision) was actually least used method. Our examination confirmed division problem typically solved by substantially diverging ISO’s theoretical framework, both an opportunity for reflection reformulation need.