공정폐액 재활용 기술의 전과정평가 연구

This study conducted the Life Cycle Assessment(LCA) of recycling technology for recovering precious metal(gold, silver) from the waste organic solvents generated in production process of LCD, semiconductor, etc. Environmental impacts were assessed for the five categories of impacts: global warming, resource depletion, acidification, eutrophication, and photochemical oxide production. When recycling 1L of waste organic solvents, global warming impact was 5.26E-02 kg CO₂-eq., resource depletion impact was 3.06E-04 kg Sb-eq., acidification impact was 1.31E-04 kg SO₂-eq., eutrophication impact was 9.70E-05 kg PO₄^3--eq., and the photochemical oxide production impact was 5.82E-05 kg C₂H₄-eq. In terms of overall environmental impacts, electricity and KCN contribute the greatest impact, so it is necessary to improve energy efficiency, change to low-energy sources, and apply renewable energy. In addition, it is necessary to compare the environmental impacts of the raw materials to replace the KCN, and a method to reduce the KCN usage in the process is needed.