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2 results

  • 35 - Acid Drainage

  • from PART III - APPLIED REACTION MODELING
  • Craig M. Bethke, University of Illinois, Urbana-Champaign
  • Book:
    Geochemical and Biogeochemical Reaction Modeling
    Published online:
    09 December 2021
    Print publication:
    06 January 2022, pp 421-430

  • Summary

    Acid drainage is a persistent environmental problem in many mineralized areas. The drainage results from weathering of sulfide minerals that oxidize to produce hydrogen ions and contribute dissolved metals to solution, posing a considerable threat to the environment. In this chapter we construct geochemical models to consider how the availability of atmospheric oxygen and the buffering of host rocks affect the pH and composition of acid drainage. We then look at processes that can attenuate the dissolved metal content of drainage waters.

  • 36 - Contamination and Remediation

  • from PART III - APPLIED REACTION MODELING
  • Craig M. Bethke, University of Illinois, Urbana-Champaign
  • Book:
    Geochemical and Biogeochemical Reaction Modeling
    Published online:
    09 December 2021
    Print publication:
    06 January 2022, pp 431-438

  • Summary

    We construct in this chapter reactive transport models of the mobility of heavy metals in an aquifer containing a complexing surface. The modeling shows that surface complexation can play a controlling role in the fate and transport of heavy metal contamination in the environment. Surface complexation causes not only retardation, as might be expected from simple sorption theory, but a pronounced tailing that hinders remediation by pump-and-treat methods.