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Clean water

Specify domain’s starting fluid composition on the Initial pane. Clean water. Start and end times of two reaction intervals. Inlet fluid enters the domain from t = 0 to 2 years. Inlet fluid carries pulse of Pb ++ and Br − into the domain. The Br − acts as a tracer in our model.

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Clean water

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  1. Specify domain’s starting fluid composition on the Initial pane Clean water Start and end times of two reaction intervals

  2. Inlet fluid enters the domain from t = 0 to 2 years Inlet fluid carries pulse of Pb++and Br− into the domain The Br− acts as a tracer in our model.

  3. Inlet 2fluid enters the domain from t = 2 to 10 years Clean rinse water: negligible Pb++ and Br− in the second inlet fluid

  4. Specify domain size, gridding, and flow rate on the Domain pane. Domain is 1 km long, divided into 400 nodal blocks Set flowrate for 1st and 2nd reaction intervals Set specific discharge or head drop

  5. Set various mass transport properties on the Medium pane. Porosity affects groundwater velocity. Used to calculate coefficient of hydrodynamic dispersion.

  6. File → Open → Sorbing Surfaces… Kd describes distribution coefficient between Pb++ and aquifer sediments. Br− does not sorb. You can add any number of Kd, Freundlich, or Langmuir isotherms. You can also account for ion exchange or surface complexation using the two layer model. Run → Go traces the model

  7. Sorption retards Pb++transport relative to nonreactive tracer Br−.

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