11 - Transport and Cation Exchange
This example corresponds to the “Example 11-Transport and Cation Exchange” from the Phreeqc manual. It can be retrieved from the Phreeqc Website.
The following example simulates the chemical composition of the effluent from a column containing a cation exchanger (Appelo and Postma, 2005). Initially, the column contains a sodium-potassium-nitrate solution in equilibrium with the exchanger. The column is flushed with three pore volumes of calcium chloride solution. Calcium, potassium, and sodium react to equilibrium with the exchanger at all times.
Studies
This project contains 1 Studies.
PhreeqcStudy: “study_11 - Transport and Cation Exchange”
Db used: “Phreeqc_dat” database
TITLE Example 11.--Transport and cation exchange.
SOLUTION 0 CaCl2
units mmol/kgw
temp 25.0
pH 7.0 charge
pe 12.5 O2(g) -0.68
Ca 0.6
Cl 1.2
SOLUTION 1-40 Initial solution for column
units mmol/kgw
temp 25.0
pH 7.0 charge
pe 12.5 O2(g) -0.68
Na 1.0
K 0.2
N(5) 1.2
END
EXCHANGE 1-40
-equilibrate 1
X 0.0011
COPY cell 1 101
END
ADVECTION
-cells 40
-shifts 100
-punch_cells 40
-punch_frequency 1
-print_cells 40
-print_frequency 20
PRINT; -reset false; -status false
COPY cell 101 1-40
END
END
TRANSPORT
-cells 40
-lengths 0.002
-shifts 100
-time_step 720.0
-flow_direction forward
-boundary_conditions flux flux
-diffusion_coefficient 0.0e-9
-dispersivities 0.002
-correct_disp true
-punch_cells 40
-punch_frequency 1
-print_cells 40
-print_frequency 20
END
/n
Plots
This project contains 2 Plots.
Plot 1: “Advection Plot”
Plot 2: “Transport Plot”
