GPS-X Technical Reference

Attached Growth Models 224
Transport
The parameters shown in Figure 7-5 are used for the transport model (diffusion) of the
various components through the biofilm. Since there are insufficient data in the literature
concerning the diffusion of various components through a biofilm, the values used for the
diffusion through water are reduced by a constant fraction, shown as reduction in
diffusion in biofilm. The default diffusion coefficients shown for water are used for the
diffusion of components from the liquid layer to the first layer (outside) of the biofilm.
The detachment rate and attachment rate are used for calculating the sloughing rate
and particulate components attachment to the biofilm, respectively.
Figure 7-5 - Mass Transport Parameters
GPS-X Technical Reference