폐굴패각과 커피찌꺼기를 혼합한 황토볼의 흡착효율에 관한 연구 (A Study on the Adsorption Efficiency of Loess Ball Mixed with Waste Oyster Shell and Coffee Grounds)

서지정보

· 발행기관 : 한국해양환경·에너지학회
· 수록지 정보 : 한국해양환경•에너지학회지 / 24권 / 3호 / 100 ~ 105페이지
· 저자명 : 김소희, 정병곤

초록

본 연구에서는 업사이클링의 일환으로 폐기물로 버려지는 폐굴패각과 커피찌꺼기 등을 이용하여 여재를 개발하였다. 폐굴패각과 커피찌꺼기를 다양한 비율에 따라 혼합하여 만든 황토볼에 대한 물성 분석 및 흡착 실험을 수행하였다. 폐굴패각과 커피찌꺼기 함량을 각각 0~30%까지 넣어서 수행한 결과, 커피찌꺼기 단독일 경우, 75 kg/cm2에서 25 kg/cm2, 폐굴패각이 10% 혼합된 경우, 131 kg/cm2에서 5 kg/cm2, 폐굴패각이 20% 혼합된 경우, 120 kg/cm2에서 5 kg/cm2로 전체적으로 폐굴패각 대비 커피찌꺼기 함량이 높아지면서 황토볼의 압축강도는 감소하였다. 반면, 커피찌꺼기와 폐굴패각의 함량이 20%까지 증가하면서 흡수율, 비표면적과 기공 부피는 각각 61%, 2.6141 m2/g, 0.0456 cm3/g까지 증가하였다. 인산인 흡착 실험에서는 커피찌꺼기만 혼합된 경우, 흡착 효율은 거의 나타나지 않았으며, 폐굴패각과 커피찌꺼기의 함량이 각각 20% 혼합된 황토볼이 10분 후 인산인 흡착 효율 87%로 가장 높았다. 반면, 폐굴패각의 함량이 30%까지 증가할수록, 요오드의 흡착량은 0~249 mg/g로 증가하였다. 10%의 동일한 커피찌꺼기 함량에서 폐굴패각 함량을 0~30%까지 증가시켰을 때, Cd의 흡착효율 14~47%, Cu의 흡착효율 22~67%, Cr의 흡착효율 9~20%로 증가하였다. 결론적으로 황토 및 점토에 대한 폐굴패각과 커피찌꺼기의 가장 좋은 혼합비는 20:10:70으로 나타났다.

영어초록

In this study, as part of upcycling, the media were developed using waste oyster shell and coffee grounds. Physical property analysis and adsorption experiments were conducted on loess balls made by mixing waste oyster shell and coffee grounds according to various proportions. As a result of adding the contents of waste oyster shells and coffee grounds up to 0-30%, respectively, the compressive strength of loess balls in which only coffee grounds were mixed alone decreased from 75 kg/cm2 to 25 kg/cm2. In the case of loess balls with 10% waste oyster shell, the compressive strength decreased from 131 kg/cm2 to 5 kg/cm2, and in the case of loess balls with 20% waste oyster shell, the compressive strength decreased from 120 kg/cm2 to 5 kg/cm2. Overall, the compressive strength of loess balls decreased as the coffee grounds content increased compared to the waste oyster shells. On the other hand, as the content of coffee grounds and waste oyster shell increased to 20%, the absorption ratio, specific surface area and pore vol-ume increased to 61%, 2.6141 m2/g, and 0.0456 cm3/g, respectively. In the phosphoric acid adsorption experiment, when only coffee grounds were mixed, the adsorption ef-ficiency hardly appeared, and the loess balls containing 20% of each of waste oyster shells and coffee grounds were the highest at 87% phosphoric acid adsorption effi-ciency after 10 minutes. On the other hand, as the content of waste oyster shell in-creased to 30%, the amount of iodine adsorption increased to 0~249 mg/g. When the waste oyster shell content was increased from 0 to 30% at the same 10% coffee grounds content, the adsorption efficiency of Cd increased to 14 to 47%, the adsorption efficiency of Cu 22 to 67%, and the adsorption efficiency of Cr from 9 to 20%. In con-clusion, the best mixing ratio of closed oyster shells and coffee grounds for loess and clay was found to be 20:10:70.

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