Journal of Soil and Groundwater Environment (한국지하수토양환경학회지:지하수토양환경)

Korean Society of Soil and Groundwater Environment (한국지하수토양환경학회)
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A Study on the Removal of Heavy Metals in Soil by Sewage Sludge Biochar

하수슬러지의 Biochar특성을 이용한 토양내 중금속 제거 연구

  • Kim, Hye-Won (Department of Environmental Engineering, The University of Seoul) ;
  • Bae, Sunyoung (Department of Chemistry, Seoul Women's University) ;
  • Lee, Jai-Young (Department of Environmental Engineering, The University of Seoul)
  • 김혜원 (서울시립대학교 환경공학과) ;
  • 배선영 (서울여자대학교 화학과) ;
  • 이재영 (서울시립대학교 환경공학과)
  • Received : 2013.02.12
  • Accepted : 2013.06.15
  • Published : 2013.06.30
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Abstract

This study proposed a low temperature hydrothermal carbonization to treat and recycle sewage sludge and determined the optimal conditions for the biochar production. The physical and chemical properties of biochar were analyzed and its sorption capacity for heavy metals was evaluated. To produce biochar, 50 g of sewage sludge was heated at 220, 230, and $240^{\circ}C$ for 1, 2, 3, 5, 8, and 10 hours in a reactor. The optimal conditions to produce biochar was $230^{\circ}C$ and 8 hours. Sorption capacity tests were conducted for arsenic (As), cadmium (Cd), copper (Cu), lead (Pb), zinc (Zn) and nickel (Ni). Among them, lead was shown the highest heavy metal adsorption efficiency of biochar, followed by copper, cadmium, zinc, and nickel, but arsenic was hardly adsorbed overall.

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