USGS developed, in cooperation with the Office of Surface Mining Reclamation and Enforcement, “user-friendly” aqueous geochemical modeling tools to simulate changes in water quality during passive and active treatment of acid mine drainage as described in a new study.
USGS Develops a New Water-Quality Modeling Tool for Acid Mine Drainage Treatment Systems
Simulates changes in water quality during treatment of acid mine drainage
New publicly available software, PHREEQ-N-AMDTreat, can be used with cost-analysis software to identify potential cost-effective strategies for treatment of acid mine drainage. Complementary tools (CausticTitration, ParallelTreatment, TreatTrainMix2) are available to simulate treatment using synthetic chemicals and natural substrates.
Equilibrium aqueous and surface speciation models are combined with kinetic models to simulate water-quality changes during treatment, including:
- Atmospheric exchange
- Iron and manganese oxidation
- Organic carbon oxidation
- Limestone dissolution
PHREEQ-N-AMDTreat outputs include:
- pH, specific conductance
- dissolved metals
- total dissolved solids
- mass of precipitated solids