GPS-X Technical Reference

219 Attached-Growth Models
Each layer of the biofilm is modelled as a CSTR with the same biological reactions as the
suspended-growth biological model (See Appendix A for the mantis model).
Attachment and detachment coefficients are used to provide for a means of transfer of
particulate components between the biofilm surface and the liquid film. This
conceptualization is shown in Figure 7-1. The concentration of each particulate state
variable is converted to volume based on the dry material content of biofilm and the
density of biofilm (both user inputs). When the volume of each layer is filled (based on
maximum biofilm thickness and number of biofilm layers) the next layer begins to fill.
When the film thickness approaches the specified maximum, increasing detachment of
biofilm will occur.
Figure 7-1 - Conceptual Diagram of the Tricking Filter Model
GPS-X Technical Reference