應用建築結構鋼直接再利用循環經濟商業模式之經濟影響與減碳效益

Abstract

世界經濟體正面臨資源有限和市場需求增加的壓力。循環經濟是對傳統線性經濟的反思，為解決自工業革命以來經濟發展所產生的負面影響提供了契機。 在循環經濟的架構下，直接再利用策略旨在延長實際上未達到生命週期末端即被廢棄的產品使用時間，避免回收再製造過程中耗費額外的能資源投入，以縮短材料的循環路徑。鋼鐵材料因其獨特的性質和世界各地已建置完善的回收系統，而在直接再利用策略的應用中佔據優勢。 本研究透過整合經濟與環境評估模型，剖析鋼鐵材料於營建相關行業中新循環路徑的可行性。以營建業的結構鋼產品為目標，作為應用直接再利用的對象，並透過引入投入產出 (IO) 分析和環境延伸投入產出 (EEIO) 分析，評估直接再利用商業模式的經濟績效和環境影響。研究結果證實，應用直接再利用循環策略可以創造一個高附加值的新產業，同時也有助於減少整個經濟體的碳排放，直接在利用策略亦能夠達到與煉鋼製程替代可比擬的減碳效益。直接再利用循環經濟商業模式預期在未來亦具有應用於其它種類材料的潛力。

The world economy is under the pressure of limited resources and increasing demand from the market. Circular economy, the rethinking of traditional linear economy, offers an opportunity to deal with the problems. The direct reuse strategy aims to extend the time of utilization with end-of-use products. Steel materials can take advantage of the direct reuse strategy because of its unique property and the well-developed recycling systems around the world. This research introduces Input-Output (IO) analysis and Environmental Extended Input-Output (EEIO) analysis to evaluate the economic performance and environmental impact of a direct reuse business model. The target of direct reuse was the structural steel products in the construction sector. The results demonstrate that the application of direct reuse circular strategy could create a new industry with high value added rate, and it could also help reduce the carbon emissions from the whole economy. This research demonstrates that the direct reuse strategy has the potential as a valuable circular economy strategy.