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Negligible ferric iron (HFO) in initial system

Specify domain’s starting fluid composition on the Initial pane. Negligible ferric iron (HFO) in initial system. Considerable Pb ++ in initial system. Start, end of simulation. Inlet fluid enters the domain from t = 0 to 10 years.

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Negligible ferric iron (HFO) in initial system

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  1. Specify domain’s starting fluid composition on the Initial pane Negligible ferric iron (HFO) in initial system Considerable Pb++ in initial system Start, end of simulation

  2. Inlet fluid enters the domain from t = 0 to 10 years Inlet fluid carries ferric hydroxide colloid into the domain Negligible Pb++ in inlet fluid

  3. Specify domain size, gridding, and flow rate on the Domain pane. Domain is 1 km long, divided into 100 nodal blocks

  4. Set various mass transport properties on the Medium pane. Colloid migrates by advection and dispersion

  5. File → Open → Sorbing Surfaces… Surface complexation dataset for hydrous ferric oxide. Set mobility to 1 to make HFO and its sorbate a mobile colloid. Mobility may vary in time and space, according to user-supplied function. Kd describes distribution coefficient between Pb++ and aquifer sediments You can add any number of sorbing surfaces.

  6. Config → Iteration If you check “sorbate include”, the total Pb++ concentration defined on Initial pane is distributed between solution and surfaces. Run → Go traces the model

  7. Initially Pb++ almost entirely sorbed to immobile aquifer sediments (>Pb++). Pb++ scavenged from aquifer sediments (>Pb++) onto mobile colloid surface (>(s)FeOPb+). Fluid transports ferric hydroxide colloid through aquifer.

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