Equilibrium and intra-particle diffusion of stabilized landfill leachate onto micro- and meso-porous activated carbon

Shrawan K. Singh, Timothy G. Townsend, David Mazyck, Treavor H. Boyer

Research output: Contribution to journalArticle

97 Scopus citations

Abstract

Stabilized landfill leachate has previously been treated with activated carbon (AC); however, information on the selectivity of AC depending upon the pore size is minimal. Isotherm and kinetic experiments were conducted using three commercially available AC products, one micro-porous and two meso-porous. Equilibrium adsorption and intra-particle diffusion of organic matter from stabilized leachate was studied. Isotherm experimental data were fitted to Langmuir, Freundlich, and Redlich-Peterson isotherm models in non-linear forms. Of the three isotherm models, the Redlich-Peterson model provided the best fit to the experimental data and showed a similar organic matter adsorption capacity (approximately 0.2 g total organic carbon (TOC) g-1 AC) for both micro-porous and meso-porous AC. The organic matter effective intra-particle diffusion coefficients (De) in both AC types were on the order of 10-10 m2 s-1 for AC particle sizes greater than 0.5 mm. Meso-porous ACs showed slightly higher De compared to micro-porous AC. Rapid small-scale tests showed a maximum of 80% TOC removal from leachate by each AC investigated. Fluorescence spectroscopy showed a preferential adsorption of fulvic-type organic matter with an increase in empty bed contact time by each AC.

Original languageEnglish (US)
Pages (from-to)491-499
Number of pages9
JournalWater Research
Volume46
Issue number2
DOIs
StatePublished - Feb 1 2012
Externally publishedYes

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Keywords

  • Adsorption
  • Fluorescence
  • Landfill leachate
  • Leachate treatment
  • Meso-porous activated carbon
  • Micro-porous activated carbon

ASJC Scopus subject areas

  • Ecological Modeling
  • Water Science and Technology
  • Waste Management and Disposal
  • Pollution

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