Acidity production and buffer requirements for in situ bioremediation of chlorinated solvents

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Acidity production and buffer model

  • Developed batch abiotic model in PHREEQC-2 using overall stoichiometry for reductive dechlorination
  • Reaction is divided in steps, buffer is added as required to maintain minimum design pH

Model considers:

  • Expected extent of dechlorination
  • Site water chemistry
  • H2 consumption by competing electron acceptors (sulphate and iron reduction)
  • Site mineralogy (mineral precipitation and dissolution)
  • Specific organic substrate and buffer added
  • A gas phase can form if total partial pressure (CO2, H2O, H2, H2S, O2) exceeds a threshold value
  • Use of acetate as electron donor

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