Journal of Environmental Science International (한국환경과학회지)

The Korean Environmental Sciences Society (한국환경과학회)
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Removal of heavy metals using waste sludge by biosorptive flotation

폐슬러지를 이용한 흡착·부상 공정에 의한 중금속 제거

  • Lee Chang-Han (School of Enviromental Science, Catholic University of Pusan) ;
  • Ahn Kab-Hwan (School of Enviromental Science, Catholic University of Pusan)
  • 이창한 (부산가톨릭대학교 환경과학부) ;
  • 안갑환 (부산가톨릭대학교 환경과학부)
  • Published : 2005.07.01
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Abstract

Waste sludge may be used to recovery wastewater contaminated with heavy metals. The waste sludge is an inexpensive readily available source of biomass for biosorption with metal-bearing wastewater. The biosorption of heavy metals such as Pb(II), Cu(II), Cr(II), and Cd(II) onto waste sludge was investigated in batch ex­periments and waste sludge loaded heavy metals was separated by dissolved air flotation. The biosorption equi­bria of heavy metals could be described by Langmuir and Freundich isotherms. The adsorption capacity for waste sludge was in the sequence of Pb(II)>Cr(II)>Cu(II)>Cd(II). The system attained equilibrium about 20 min. The Langmuir and Freundlich adsorption model effectively described the biosorption equilibrium of Cu(II) and Cr(II) ions on waste sludge. Maximum adsorption capacity of Cu(II) and Cr(II) were 196.08 and 158.73 mg/g, respectively. Solid-liquid separation efficiencies were kept above $95\%$ on waste sludge loaded heavy metals, and were decreased with pH increasing.

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