GPS-X Technical Reference

109 Suspended Growth Models
SUMMARY OF AERATION INPUT PARAMETERS
This section discusses the aeration forms that are applicable to most biological objects. The
forms from the Completely-Mixed Tank are used as an example.
Aeration Setup Form
The Aeration Setup form is accessed by right-clicking on most biological objects and
selecting Input Parameters > Operational. Figure 6-1 shows the GPS-X form. The
parameters are discussed below:
Aeration method (Diffused Air/Mechanical (Surface Aeration)): Specifies
whether the aeration system is diffused or mechanical (surface).
Specify oxygen transfer by… (Entering Airflow/2 Entering K La/3 Entering
Mechanical Power/4 Using a DO Controller): Specifies the method of oxygen
transfer, entering airflow, K La, mechanical power, or using a DO controller. Entries
that do not apply are greyed out. For example, you cannot specify the oxygen
transfer by entering mechanical power if the aeration method is diffused.
Oxygen mass transfer coefficient (clean water): Clean water K La at 20°C with no
alpha or fouling factor correction.
Aeration power: The power of the mechanical aeration system.
Air flow into aeration tank: Diffused air flow into the aeration tank. The airflow
can be at standard conditions (U.S., European, or User-Defined) or at field
conditions depending on user selections. The user can select standard or field
conditions in the Input Parameters > Operational > More… form. The user can
select which standard conditions are used in the
Input Parameters > Physical >More… if local conditions for O 2 solubility are used,
or in the System >Input Parameters > Physical form if global conditions for O 2
solubility are used.
GPS-X Technical Reference