Specify domain’s starting fluid composition on the Initial pane

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Presentation transcript:

Specify domain’s starting fluid composition on the Initial pane Negligible ferric iron (HFO) in initial system Considerable Pb++ in initial system

Define the reaction intervals Define the reaction intervals. Specify what fluids flow into the domain, and when. A single inlet fluid flows into the domain for 10 years. Click to add a new reaction interval

The inlet fluid is defined on the Fluids pane Inlet fluid carries ferric hydroxide colloid into the domain Negligible Pb++ in inlet fluid

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

Specify flow rate on the Flow pane. Set specific discharge or hydraulic head/ potential drop

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

File → Open → Sorbing Surfaces… Surface complexation dataset for hydrous ferric oxide. Set mobility in the domain to 1 to make HFO and its sorbate a mobile colloid. Kd describes distribution coefficient between Pb++ and aquifer sediments You can add any number of sorbing surfaces.

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

Fluid transports ferric hydroxide colloid through aquifer. 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.