GPS-X Technical Reference

63 Influent Models
Figure 5-3 - Influent Advisor Screen Showing Highlighted Cells and Negative Values
(Highlighted in Red)
The influent models used in GPS-X make certain assumptions about what data may or may not be
available. For instance, no influent model uses both COD and BOD data, even though this data
may be available and may provide important information about how that organic material is
partitioned into the available state variables. Influent Advisor helps overcome this shortcoming.
Take an example in which BOD and COD data is available and the BODbased model is chosen
for the influent object. The applicable data can be entered into Influent Advisor, including the
available BOD data. The user can then scroll to the right table and check the COD value
calculated based on the input data. If the COD data is in agreement with the measured COD data
(assuming no negative values in any cells), then the user can be assured that the input data is
consistent with the available data. If the COD data is different from the measured COD, then the
unknown (or estimated) input data should be adjusted until acceptable agreement is achieved.
GPS-X Technical Reference