GPS-X Technical Reference

Influent Models 88
Figure 5-27 - Selection of Feed Chemical and Set-up of Chemical Properties
The COD chemical dosage object has a built-in flow rate controller. The controller is
useful for controlling the feed rate of COD based on a user defined controlled variable.
Acid Dosage Object
The acid dosage object is only available in the MANTIS2LIB. The acid dosage object
uses the acidfeed model (Figure 5-28). The acid dosage object allows user to select the
type of acid used in the feed. Three acids HCl, H 2SO 4 and HNO 3 are available for
selection from the Composition > Feed Chemical Details menu (Figure 5-29). The
Feed Chemical Details menu is as shown in Figure 5-30. For the selected chemical, two
input parameters of % purity and density of chemical solution at the selected %-purity are
required. If HCl or H 2SO 4 is selected, the state variable of other anion (sana) is set to the
equivalent dosed amount. If HNO 3 is the selected acid then, the state variable of Nitrate-
N (snoa) is set to an equivalent concentration.
Figure 5-28 - Models in Acid Dosage Influent Object
GPS-X Technical Reference