Development of Material Separation Process for Recycling Waste Coffee Capsules

Sang-Ho Baek; Yosep Han; Seongmin Kim; Davaadorj Tsogchuluun; Ho-Seok Jeon

doi:10.7844/kirr.2021.30.3.70

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2021 Vol.30, Issue 3 Preview Page

Technical Research Paper

Development of Material Separation Process for Recycling Waste Coffee Capsules 폐 커피 캡슐의 재활용을 위한 재질분리 공정 개발

30 June 2021. pp. 70-81

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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 that sufficient functionality existed as recycled PP. However, owing to the dark color of the pellets, limited applications to black or dark products are expected.

Keywords

Coffee capsule

Recycling

Material separation

Corona discharge electrostatic separation

Recycled plastic

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.

키워드

커피 캡슐

재활용

재질분리

코로나 방전형 정전선별

재생 플라스틱

References

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Information

Publisher :The Korean Institute of Resources Recycling
Publisher(Ko) :한국자원리싸이클링학회
Journal Title :Resources Recycling
Journal Title(Ko) :자원리싸이클링
Volume : 30
No :3
Pages :70-81
Received Date : 2021-04-06
Revised Date : 2021-04-30
Accepted Date : 2021-05-03
DOI :https://doi.org/10.7844/kirr.2021.30.3.70

Resources Recycling ISSN:2765-3439(Print) 2765-3447(Online) 자원리싸이클링

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