近年來,由於國際社會環保意識的提升,使得產業界開始重視環保議題。本研究於綠色供應鏈體系中,探討廢棄物回收及清運產業於綠色供應鏈中所扮演之角色,並思考回收產業如何更有效率的處理工廠所產生的事業廢棄物。 本研究針對事業廢棄物回收產業中不同製程型態發展出三種存貨模式,分別為單位產出模式、一次產出模式與二階段製程模式,且考慮產能利用率問題,其中一次產出模式以及二階段製程模式中的回收率為隨時間長短而變動之非線性之曲線,並建立兩種清運策略,分別為多製程週期清運一次與單一週期多次清運策略,並將具有經濟價值的回收物加入討論,建構公式求算最佳決策以達到總成本最小化之目的,經過實驗結果分析,回收率的高低會影響回收物與最終廢棄物清運間隔時間長短,回收物的售價高低會影響製程的時間長度。最後針對回收中心系統中廢棄物處理成本項目進行投資,透過實驗分析後,觀察到不同投資區間或投資效益的情況下,總成本與投資決策會有不同結果之呈現,以提供企業更快速且正確的選擇最佳投資方案參考之用。
In recent years, industries are paying more attention to environmental issues thanks to the rise of global environmental awareness. This research considers the roles of waste recycling and disposal companies in the green supply chain, and studies the issues of how to effectively process and recycle waste from industries. This research develops three models (one-piece processing model, whole-lot processing model and two-stage processing model) based on various processes of industrial waste. Capacity utilization of processing waste, profits from recycled valuables, constant and processing time-dependent recycle rates are considered. Two strategies, multiple waste disposal cycles and multiple recycling cycles, are developed. Formulas for optimal recycling quantity and waste disposal cycle that minimize total costs are derived. Results from numerical experiment show how recycle rates affect optimal waste recycling and waste disposal cycles and how profits from recycled valuables influence optimal recycling quantity. Finally, the subject of investing on the improvement of recycle rate is addressed. Through experiment, it can be observed that optimal investment strategies and resulting total costs are varied in various scenarios. The findings from this research can serve as valuable reference in quickly making correct investment alternatives.