GPS-X Technical Reference

Influent Models 76
If the individual flow type is selected, there will be an intermittent (or batch) influent. Under the
Flow sub-menu item individual, the user can specify the starting and ending time of the batch
influent, and the volume of each truck (1 truck per day by default - the number of trucks per day
is specified in the Influent Composition sub-menu). The total volume specified will be fed at an
average rate over the total dumping time specified, that is there will be one influent flow spike.
If the individual load type is selected, the loading is determined by the amount specified in the
Individual Loads sub-menu. The stoichiometry is specified in the Influent Characterization
menu and the number of trucks per day is specified in the Composition sub-menu (see Figure
5-15).
INFLUENT APPENDICES
Figure 5-15 - Batch Input Menu - Flow Data Model Inputs
Model-Dependent State and Composite Variables
When setting up your influent model, it is important that you realize what state variables
are used in each biological model. The following sections outline the state variables used
in the models in the different libraries.
Of similar importance is an understanding of how the composite variables are calculated
from the state variables. This is important because many of the influent models go
backwards (i.e. from the composite variables to the state variables); hence, an
understanding of these relationships will help if debugging is necessary. Influent
Advisor has been developed specifically to help navigate the more complicated influent
models. The following figures were developed to help with this understanding.
The composite variable figures are copies of the figures presented in the composite
variables chapter of this Reference; however, they are repeated here because of their
importance to the influent model calculations.
GPS-X Technical Reference