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Selection of adsorbents for treatment of leachate: batch studies of simultaneous adsorption of heavy metals

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Author

  • Uelis Soukand
  • Pille Kängsepp
  • Rutt Kakum
  • Toomas Tenno
  • Lennart Mathiasson
  • William Hogland

Summary, in English

The simultaneous adsorption of copper (Cu), cadmium (Cd), nickel (Ni), and lead (Pb) ions from spiked deionized water and spiked leachate onto natural materials (peat A and B), by-product or waste materials (carbon-containing ash, paper pellets, pine bark, and semi-coke), and synthetic materials (based on urea-formaldehyde resins, called blue and red adsorbents) or mixtures thereof was investigated. The adsorbents that gave the highest metal removal efficiencies were peat A, a mixture of peat B and carbon-containing ash, and a mixture of peat A and blue. At an initial concentration of 5 mg/l for each metal, the removal of each species of metal ion from spiked water and spiked leachate solutions was very good (> 90%) and good (> 75%), respectively. When the initial concentration of each metal in the solutions was twenty times higher (100 mg/l), there was a noticeable decrease in the removal efficiency of Cu2+, Cd2+, and Ni2+, but not of Pb2+. Langmuir monolayer adsorption capacities, q(m), on peat A were found to be 0.57, 0.37, and 0.36 mmol/g for Pb2+, Cd2+, and Ni2+, respectively. The order of metal adsorption capacity on peat A was the same in the case of competitive multimetal adsorption conditions as it was for single-element adsorption, namely Pb2+ > Cd2+ a parts per thousand yen Ni2+. The results show that peat alone (an inexpensive adsorbent) is a good adsorbent for heavy metal ions.

Publishing year

2010

Language

English

Pages

57-65

Publication/Series

Journal of Material Cycles and Waste Management

Volume

12

Issue

1

Document type

Journal article

Publisher

Springer

Topic

  • Analytical Chemistry

Keywords

  • Adsorption
  • Peat
  • Carbon-containing ash
  • Leachate

Status

Published

ISBN/ISSN/Other

  • ISSN: 1438-4957