GPS-X Technical Reference

SIMPLE BIOLOGICAL AERATED FILTER (BAF) MODEL
Conceptual Model
Attached Growth Models 238
The simple BAF model combines the 1-D biofilm model used in the trickling filter with
an aeration model and simple solids-separation model. It is similar in construct to the
denitrification filter, with the addition of aeration. The Simple BAF model is designed to
be a less-sophisticated, but easier-to-use alternative to the advanced BAF model. The
Simple BAF model will solve to steady-state using the GPS-X steady-state solver
(whereas the Advanced BAF model cannot, and requires a dynamic simulation to come to
equilibrium).
The simple BAF uses a series of horizontal layers (6 by default) to represent plug-flow
through media. The filter is fed from the bottom and effluent is taken from the top.
Figure 7-14 - Simple BAF Model Configuration
Oxygen solubility is calculated separately for each layer, allowing for depth effects to be
reflected in oxygen saturation concentration.
GPS-X Technical Reference