Inoperability assessment of integrated plastics recycling networks using the Criticality Index

Purpose Integrated Plastics Recycling Networks (IPRNs) can improve current rates of plastic recycling. However, these networks are susceptible to cascading failures, where inoperability in one component unit propagates throughout the system. This study introduces a new method for evaluating the effect of inoperability on IPRNs and identifying the critical components whose failure significantly affects other components. Design/methodology/approach The Criticality Index, originally developed for integrated energy systems, is adapted to assess inoperability of IPRNs. This methodology is demonstrated through its application in two case studies. Findings The findings reveal that units whose outputs are predominantly intermediates have high criticality. Research limitations/implications This development provides a novel quantitative approach to identifying critical operations in IPRNs. Practical implications Applying the Criticality Index can provide valuable insights for developing risk mitigation measures during inoperability conditions in IPRNs. This metric can enhance the robustness of these networks during disruptions and contribute to more efficient management of plastic waste. Originality/value This study introduces a novel approach based on the Criticality Index for identifying the components of IPRNs that need to be prioritized to ensure system operability. This capability can be used to mitigate the techno-economic risks that have caused the failure of many plastics recycling ventures.