GPS-X Technical Reference

Suspended Growth Models 216
Note, the user must specify the cryptic variable name without labels. The user may
specify any state variable as a toxic component, including regular states (sno, snh, xnd,
etc.) and any of the IP state variables (sza, szb, xza, xzb, etc.).
The toxic component # 1 inhibition constant is a half-saturation coefficient that represents
the concentration at which the biological growth rate will be half of its normal value.
Sorption of Toxic Components
The sorption parameters for the toxic components are found in the PAC Addition menu,
in the More… button. These components are added to the ss and si sorption isotherms
described above, to make a 5-component competitive sorption system. The sorption rates
for a five-component system are all on the form.
Equation 6.80
where:
var1, var2, var3 = toxic component concentrations (g/m 3 )
MA var
= maximum adsorption capacity (g/gPAC)
KL var = sorption half-saturation coeff (g/m 3 )
The multi-component competitive sorption model will favour sorption of those
components with the lowest sorption half-saturation coefficient.
GPS-X Technical Reference