GPS-X Technical Reference

Suspended Growth Models 186
Figure 6-24 - Continuous Flow Sequencing Reactor Rotating Aeration Bridge Setting
Controller Operation
The CFSR object specifies oxygen transfer by using either a DO controller option or
entering airflow as the manipulated variable in place of K La (similar to other DO
controllers in GPS-X). The PID DO controller manipulates K La and back calculates the
required airflow.
The CFSR object contains one additional specify oxygen transfer by... option: The DO
On/Off Controller is switches the airflow into the tank on and off depending on the
specified DO high and low limits. How quickly action is taken by the controller (after the
upper or lower limit is reached) is dependent on the controller’s specified sampling time.
The CFSR object in GPS-X contains three additional Aeration Controllers which can be
paired with any of the specify oxygen transfer by... options: timer, nitrate controller and
the ammonia controller. These additional controllers can be seen in Figure 6-25. While
the specify oxygen transfer by... controller options control only the DO concentration,
the aeration controllers manage more complex aeration strategies in the tank. During
GPS-X Technical Reference