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Removal of Pb2+ and Cd2+ by adsorption on clay-solidified grouting curtain for waste landfills

  • Chen Yong-gui Email author
  • Zhang Ke-neng 
  • Zou Yin-sheng 
  • Deng Fei-yue 
Article

Abstract

Pb2+ and Cd2+ in leachate were adsorbed on clay-solidified grouting curtain for waste landfills with equilibrium experiment. The cation exchange capacity was determined with ammonium acetate. And the concentration of heavy metal cations in leachate was determined with atomic absorption spectrophotometer. Their equilibrium isotherms were measured, and the experimental isotherm data were analyzed by using Freundlich and Langmuir models. The results show that the adsorption capacities of the heavy metal cations are closely related to the compositions of clay-solidified grouting curtain, and the maximum adsorption appears at the ratio of cement to clay of 2:4 in the experimental conditions. At their maximum adsorption and pH 5.0, the adsorption capacities of Pb2+ and Cd2+ are 16.19 mg/g and 1.21 mg/g. The competitive adsorption coefficients indicate that the adsorption of clay-solidified grouting curtain for Pb2+ is stronger than that for Cd2+. The adsorption process conforms to Freundlich’s model with related coefficient higher than 0.996.

Key words

adsorption clay-solidified grouting curtain Pb2+ Cd2+ Freundlich model leachate treatment 

CLC number

X53 

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Copyright information

© Central South University 2006

Authors and Affiliations

  • Chen Yong-gui 
    • 1
    • 2
    • 3
    Email author
  • Zhang Ke-neng 
    • 2
  • Zou Yin-sheng 
    • 3
  • Deng Fei-yue 
    • 4
  1. 1.School of Bridge and Structural EngineeringChangsha University of Science and TechnologyChangshaChina
  2. 2.School of Geoscience and Environmental EngineeringCentral South UniversityChangshaChina
  3. 3.School of Civil EngineeringHunan UniversityChangshaChina
  4. 4.School of Chemistry and Chemical EngineeringCentral South UniversityChangshaChina

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