Resources Recycling (자원리싸이클링)

The Korean Institute of Resources Recycling (한국자원리싸이클링학회)
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Development of Material Separation Process for Recycling Waste Coffee Capsules

폐 커피 캡슐의 재활용을 위한 재질분리 공정 개발

  • Baek, Sang-Ho (Resources Recovery Research Center, Mineral Resources Division, Korea Institute of Geoscience and Mineral Resources) ;
  • Han, Yosep (Resources Recovery Research Center, Mineral Resources Division, Korea Institute of Geoscience and Mineral Resources) ;
  • Kim, Seongmin (Resources Recovery Research Center, Mineral Resources Division, Korea Institute of Geoscience and Mineral Resources) ;
  • Davaadorj, Tsogchuluun (Department of Resources Recycling, University of Science and Technology) ;
  • Jeon, Ho-Seok (Resources Recovery Research Center, Mineral Resources Division, Korea Institute of Geoscience and Mineral Resources)
  • 백상호 (한국지질자원연구원 광물자원연구본부 자원회수연구센터) ;
  • 한요셉 (한국지질자원연구원 광물자원연구본부 자원회수연구센터) ;
  • 김성민 (한국지질자원연구원 광물자원연구본부 자원회수연구센터) ;
  • ;
  • 전호석 (한국지질자원연구원 광물자원연구본부 자원회수연구센터)
  • Received : 2021.04.06
  • Accepted : 2021.05.03
  • Published : 2021.06.30
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Abstract

This study evaluated the recyclability of waste plastics in used coffee capsules disposed of as municipal waste. For recycling, a new material separation process was developed to remove the coffee grounds through primary crushing, washing, sieving, and secondary crushing, followed by corona discharge electrostatic separation. Furthermore, for the under 10 mm size fraction samples, the aluminum removal and the plastic recovery were 95.4% and 98.3%, respectively, under optimal conditions. In addition, for the 15 mm fraction samples, the aluminum removal and the plastic recovery were 91.3% and 97.2%, respectively. To evaluate the recyclability of the separated waste plastics, the samples were pelleted, and their material properties were analyzed. No hazardous substances were detected, and the results were similar to those for homo-PP. Therefore, it was confirmed tha t sufficient functiona lity existed a s recycled PP. However, owing to the da rk color of the pellets, limited applications to black or dark products are expected.

본 연구에서는 현재 생활계 폐기물로 폐기되는 커피 캡슐의 재질분리 공정 개발을 통해 폐플라스틱의 재활용 가능성을 평가하였다. 1차 파쇄, 세척 및 체질을 통해 커피찌꺼기를 제거하고 2차 파쇄 후, 총 3번의 코로나 방전형 정전선별을 수행하는 재질분리 공정이 개발되었다. 이때, -10 mm 시료는 최적조건에서 알루미늄 제거율과 플라스틱 회수율이 각각 95.4%와 98.3% 이었으며, -15 mm는 각각 91.3%와 97.2% 이었다. 재질분리 된 폐플라스틱의 재활용 가능성을 평가하기 위하여, 시료를 펠릿으로 제조하고 물성을 분석하였다. 분석결과, 유해물질은 검출되지 않았으며, Homo-PP와 유사한 결과를 보였다. 따라서 재생 PP로 충분한 기능성이 존재하는 것을 확인하였다. 다만, 어두운 색상으로 인해 검정 혹은 어두운 계열의 제품군에 한정적으로 적용 가능할 것으로 평가되었다.

Keywords

Acknowledgement

본 연구는 한국지질자원연구원 주요사업인 '국내 부존 바나듐(V) 광물자원 선광/제련/활용기술 개발(GP2020-013, 21-3212-1)' 과제의 일환으로 수행되었습니다.

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