Multicomponent transport with coupled geochemical and microbiological reactions: Model description and example simulations

Caroline Tebes-Stevens, Albert J. Valocchi, Jeanne M. Vanbriesen, Bruce E. Rittmann

Research output: Contribution to journalArticle

81 Scopus citations

Abstract

A reactive transport code (FEREACT) has been developed to examine the coupled effects of two-dimensional steady-state groundwater flow, equilibrium aqueous speciation reactions, and kinetically-controlled interphase reactions. The model uses an iterative two-step (SIA-1) solution algorithm to incorporate the effects of the geochemical and microbial reaction processes in the governing equation for solute transport in the subsurface. This SIA-1 method improves upon the convergence behavior of the traditional sequential iterative approach (SIA) through the inclusion of an additional first-order term from the Taylor Series expansion of the kinetic reaction rate expressions. The ability of FEREACT to simulate coupled reactive processes was demonstrated by modeling the transport of a radionuclide (cobalt, 60Co2+) and an organic ligand (ethylenediaminetetraacetate, EDTA4-) through a column packed with an iron oxide-coated sand. The reaction processes considered in this analysis included equilibrium aqueous speciation reactions and three types of kinetic reactions: adsorption, surface dissolution, and biodegradation.

Original languageEnglish (US)
Pages (from-to)8-26
Number of pages19
JournalJournal of Hydrology
Volume209
Issue number1-4
DOIs
StatePublished - Aug 1 1998
Externally publishedYes

Keywords

  • Adsorption
  • Biodegradation
  • Geochemistry
  • Groundwater
  • Numerical models
  • Solute transport

ASJC Scopus subject areas

  • Water Science and Technology

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