GPS-X Technical Reference

Suspended Growth Models 174
The decant flow rate (pumped flow parameter) and waste flow rate (underflow rate
parameter) are entered in the Parameters > Operational - Flow Control form.
The influent flow to the SBR is taken from the upstream object (e.g. influent object) if the
influent #1 pump label parameter is left blank in the Flow Control form. The user must
then make sure that the influent flow is synchronized with the SBR cycle (i.e. entering
the SBR during the appropriate phase). Alternatively, in the Flow Control form, you can
enter a stream label for the influent #1 pump label parameter, a flow rate for the first
influent flow parameter, and the SBR influent flow will be automatically taken from that
stream during the appropriate phase within the cycle (automatic synchronization). The
stream label must be associated with a pumped flow stream (`qcon' variable), for example
an influent icon or pumped flow from a tank. The influent #2 pump label parameter is
ignored in this cycle type.
Advanced SBR Cycle Settings
The SBR operational cycle parameters for the Advanced SBR model are shown in Figure
6-19. The advanced SBR cycle is more general than the simple SBR model, allowing the
user to define up to ten or more different phases. For each phase defined, the
corresponding duration, mixing (either on or off), aeration (oxygen mass transfer
coefficient), decant flow rate, and wastage flow rate can be specified. The order of the
user-defined phases is fixed according to their order presented in the forms.
The influent flow to the SBR is taken from the upstream object (e.g. influent object) if the
influent #1 pump label and influent #2 pump label parameters are left blank in the
Flow Control form. The user must then make sure that the influent flow is synchronized
with the SBR cycle (i.e. entering the SBR during the appropriate phase). Alternatively,
you can enter stream labels for the influent #1 pump label and influent #2 pump label
parameters in the Flow Control form, flow rates for the influent #1 flow in phase and
influent #2 in phase parameters in the form (Advanced section), and the SBR influent
flow will be synchronized automatically.
The stream labels must be associated with pumped flow streams (`qcon...' variables), for
example an influent icon or pumped flow from a tank. Most applications will only use
one influent, but second influent was provided for cases were methanol is added, for
example.
GPS-X Technical Reference