Simultaneous application of dissolution/precipitation and surface complexation/surface precipitation modeling to contaminant leaching.

Academic Article

Abstract

  • This paper discusses the modeling of anion and cation leaching from complex matrixes such as weathered steel slag. The novelty of the method is its simultaneous application of the theoretical models for solubility, competitive sorption, and surface precipitation phenomena to a complex system. Selective chemical extractions, pH dependent leaching experiments, and geochemical modeling were used to investigate the thermodynamic equilibrium of 12 ions (As, Ca, Cr, Ba, SO4, Mg, Cd, Cu, Mo, Pb, V, and Zn) with aqueous complexes, soluble solids, and sorptive surfaces in the presence of 12 background analytes (Al, Cl, Co, Fe, K, Mn, Na, Ni, Hg, NO3, CO3, and Ba). Modeling results show that surface complexation and surface precipitation reactions limit the aqueous concentrations of Cd, Zn, and Pb in an environment where Ca, Mg, Si, and CO3 dissolve from soluble solids and compete for sorption sites. The leaching of SO4, Cr, As, Si, Ca, and Mg appears to be controlled by corresponding soluble solids.
  • Authors

  • Apul, Defne S
  • Gardner, Kevin
  • Eighmy, T Taylor
  • Fällman, Ann-Marie
  • Comans, Rob NJ
  • Status

    Publication Date

  • August 1, 2005
  • Published In

    Keywords

  • Adsorption
  • Chemical Precipitation
  • Industrial Waste
  • Metallurgy
  • Models, Chemical
  • Solubility
  • Surface Properties
  • Digital Object Identifier (doi)

    Pubmed Id

  • 16124310
  • Start Page

  • 5736
  • End Page

  • 5741
  • Volume

  • 39
  • Issue

  • 15