Journal of Korean Society of Environmental Engineers (대한환경공학회지)

Korean Society of Environmental Engineers (대한환경공학회)
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Removal of Heavy Metals from Aqueous Solution by a Column Packed with Peat-Humin

Peat-Humin 충전 칼럼을 이용한 수용액 중의 중금속 제거

  • Shin, Hyun-Snag (Department of Environmental Engineering, Seoul National University of Technology) ;
  • Lee, Chang-Hoon (Korea Institute of water and Environment, Korea Water Resource Corporation) ;
  • Lee, Yo-Snag (Korea Institute of water and Environment, Korea Water Resource Corporation) ;
  • Kang, Ki-Hoon (Technology Research Institute, Daelim Industrial Cp., Ltd.)
  • 신현상 (서울산업대학교 환경공학과) ;
  • 이창훈 (한국수자원공사 수자원연구원) ;
  • 이요상 (한국수자원공사 수자원연구원) ;
  • 강기훈 ((주)대림산업 기술연구소)
  • Published : 2005.05.31
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Abstract

Peat humin(p-Humin) extracted from Canadian Sphagnum peat moss was packed in a column and removal of heavy metal ions such as Cd, Cu and Pb from aqueous solution under flow conditions was studied. The metal ions were removed not only from single-element solutions but also from a multi-metal solution. Column kinetics for metal removal were described by the Thomas model. For single-component metal solutions, the maximum adsorption capacities of the p-Humin for Pb, Cu and Cd were 138.8, 44.66 and 41.61 mg/g, respectively. The results of multi-component competitive adsorption showed that adsorption affinity was in the order of Pb $\gg$ Cu > Cd. The adsorbed metal ions were easily deserted from the p-Humin with 0.05 N $HNO_3$ solution. It is apparent that 95% of the heavy metal ions were recovered from the saturated column. This investigation provides possibility to clean up heavy-metal contaminated waste waters by using the natural biomass, p-Humin as an environmentally friendly and cost-effective new biosorbents.

본 연구에서는 피트모스(Canadian Sphagnum peat moss)로부터 추출한 피트-휴민 (p-Humin)입자를 충전한 칼럼의 연속흐름 조건하에서의 중금속 이온(Cd, Cu, Pb)의 흡착 및 탈착효율을 조사하였다. p-Humin 충전 칼럼은 단일 성분 및 혼합 중금속 용액 모두에서 높은 중금속 제거효율을 보였으며, 실험 결과는 Thomas 모델식을 적용하여 p-Humin의 중금속 흡착특성에 대한 기초 자료를 산출하였다. 단일 성분 중금속 용액을 대상으로 한 실험 결과, p-Humin 단위 그램당 Cd, Cu 및 Pb의 최대 흡착량($q_0$)은 각각 138.8, 44.66 및 41.61 mg/g으로 나타났다. 혼합 중금속 용액을 대상으로 각 중금속 이온의 경쟁흡착 반응실험 결과, p-Humin에 대한 중금속 이온의 친화력 세기는 Pb $\gg$ Cu > Cd이었다. 흡착된 금속이온은 0.05 N $HNO_3$ 용액을 사용하여 쉽게 탈착시켜 회수할 수 있었으며, 회수율은 약 95% 이상을 나타냈다. 본 연구를 통해 p-Humin은 친환경적이고 경제적인 생흡착제로서 폐수 중 중금속 이온의 제거에 활용 가능함을 확인하였다.

Keywords

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