GPS-X Technical Reference

221 Attached-Growth Models
Equation 7.2
where:
A = surface area of attached microorganisms (m 2 )
D S
Q B
R s
S
S j B
t
y
L
= state variable diffusion coefficient (m 2 /d)
= volumetric flow rate of attached biofilm layer (L/d)
= substrate utilization rate (mg/L/d)
= state variable concentration in layer (mg/L)
= state variable concentration in attached biofilm layer j (mg/L)
= time (days)
= thickness of biofilm layer (m)
= attached biofilm thickness in layer (m)
Model Parameters
Physical
This section of the chapter discusses the various model parameters and inputs that the
user would encounter when using this model. The examples and discussion below pertain
to the mantis model in the CN library.
These menu items are found under the Parameters sub-menu item Physical and contain
both real physical dimensions to describe the actual trickling filter being modelled, as
well as model dimensions which allow the user to specify how the physical system will
be modelled. There are two items under the heading Speed, which allow the user to
optimize the simulation speed of this model by changing the frequency of integration for
the soluble components.
GPS-X Technical Reference