Evaluation of Material Recycling System with Logit Model

Abstract

Recycling of various materials has been urged worldwide for environmental reasons. Promotion of recycling is expected to reduce environmental pollution caused by material production. However, recycling of materials can lead to increase in tramp element concentration in the material, which often causes difficulties in manufacturing and other processes. Therefore, it is necessary to evaluate every aspect of recycling in order to achieve both reduction in environmental burden and efficient use of the material.
In this study, we assume that the historic change of the amount of material stock can be approximated by logistic equation and made long term simulation of tramp element accumulation, CO₂ emission, etc. in recycling system of steel. By using this method, we evaluated various recycling systems and showed that combination of several policies can achieve significant reduction of CO₂ emission while maintaining quality of the material.