丝绸2025，Vol.62Issue(9)：11-22,12.DOI:10.3969/j.issn.1001-7003.2025.09.002
废旧纺织品再生循环LCA中EoL分配方法建模与对比
Modeling and comparison of EoL allocation methods in LCA for waste textile recycling
摘要
Abstract
Life Cycle Assessment,a tool for quantifying environmental benefits,faces questions on the scientificity and reliability of its results mainly because of the absence of a unified standard for allocating environmental loads in the End of Life(EoL)stage.Current LCA studies on waste textile recycling primarily adopt cut-off and system expansion methods for EoL stage allocation,with limited applications of economic allocation,50/50 allocation,and allocation at the point of substitution.Due to the lack of unified modeling standards for EoL stage allocation methods,the essential differences in modeling logic among these five EoL stage allocation methods lead to significant discrepancies or even contradictions in carbon footprint accounting results of similar recycled textiles,severely affecting the comparability of assessment results.Meanwhile,each method has its own limitations in terms of data requirements,applicable scenarios,and assumptions. To explore the modeling characteristics,calculation rules,application conditions,and advantages/disadvantages of commonly used EoL allocation methods in life cycle assessment of waste textile recycling,this study conducts demonstrative modeling calculations for the cut-off method,system expansion method(direct system enlargement),economic allocation method(mid-point scenario,and co-product scenario),50/50 allocation method,and allocation at the point of substitution through hypothetical examples.Findings show that the key to EoL allocation lies in scientifically defining the system boundary to accurately allocate environmental burdens and benefits across life cycles;the shared modules with allocation disputes mainly include environmental loads of primary processes,recycling processes,and waste management processes.Each EoL allocation method varies in basic principles and modeling rules,with its own advantages,disadvantages,and applicability,requiring the selection of suitable methods in combination with specific objectives and application scenarios.The cut-off method simplifies life cycle assessment by focusing on significant impacts,featuring easy application without deferring environmental load accounting to the future.However,it ignores potential environmental impacts and benefits beyond the cut-off point,as well as the inherent connections between virgin materials and recycled materials.The system enlargement method(direct system enlargement)covers broader impacts and enables more accurate simulation of material life cycles,but it involves complex calculations and difficult boundary definition.Meanwhile,requiring multiple assumptions and additional data introduces more uncertainties into the results,and it fails to describe the respective environmental loads of various products in the material life cycle.The economic allocation method reflects market values by requiring the collection of economic values of recycled materials at different life cycle stages,yet market fluctuations often affect the results.The 50/50 allocation method,when simplified,is easy to apply and ensures both parties bear certain burdens,but it strictly sets the allocation ratio at 0.5 regardless of recycling times or other conditions,ignoring the inherent connections between virgin and recycled materials.Allocation at the point of substitution focuses on substitution benefits but requires specific data and may fail to consider the entire life cycle. To promote the low-carbon transformation of the textile industry,it is urgent to establish a multi-dimensional evaluation system for EoL allocation methods and develop standardized and unified allocation methods for recycling modeling.关键词
废旧纺织品/生命周期评价/生命周期末端/EoL分配方法/多功能性/再生循环Key words
waste textiles/life cycle assessment(LCA)/End of Life/EoL allocation methods/multi-functionality/recycling分类
轻工纺织引用本文复制引用
邓思慧,刘思思,吴雄英,丁雪梅..废旧纺织品再生循环LCA中EoL分配方法建模与对比[J].丝绸,2025,62(9):11-22,12.基金项目
中央高校基本科研业务费专项基金项目(2232025G-08) （2232025G-08）
上海市科委技术委员会项目(21640770300) （21640770300）
