GPS-X Technical Reference

GPS-X Objects 30
If this logical variable is false, then the user can specify the initial reactor volume at the
start of the simulation. As a consequence of this, the user can specify the starting volume
as full by two ways:
1. Either setting the logical variable as “true”; or
2. By setting the variable as “false” and manually specifying the starting volume as
equal to the maximum tank volume.
From Equation 2.1, the concentration of a conservative material in objects with volume
relative to its influent concentration can be calculated as shown in the following equations:
Equation 2.5
where:
X = conservative component concentration (g/m 3 )
Q = flow rate (m 3 /d)
t = time (d)
Q in = influent stream
Q out = effluent stream
X out = effluent concentration (g/m 3 )
At steady-state, the time derivatives are zero and Equation 2.5 becomes:
Equation 2.6
If the SRT is defined as:
Equation 2.7
where:
SRT = solids retention time (d)
V = volume (m 3 )
GPS-X Technical Reference