GPS-X Technical Reference

313 Others Models
DEWATERING
Four models are associated with this object: asce, empiric, simple and press. The models all
simulate solids separation, but do so via different models that have been calibrated for different
dewatering technologies.
ASCE Model
Figure 11-9 - Dewatering Object Models
The asce model is based on a paper by the Task Committee on Belt Filter Presses for the
American Society of Civil Engineers (ASCE, 1988). Based on this work, which involved
information collected as part of a survey through the United States, a relationship was
developed between the feed solids and cake concentration. The primary sludge fraction
(i.e. percent of sludge for processing originating from primary sludge) is the main
parameter in determining the cake solids from the unit. The solids capture is used to
determine the centrate solids concentration and the developed relationship is used to
determine the cake solids. A material balance is used to determine the two output flows.
Empiric Model
The empiric dewatering model is used when modellers wish to specify an underflow
solids concentration and flow rate, or specify a concentration removal efficiency along
with either the underflow flow rate or solids concentration.
Figure 11-10 - Operational Menu for Empiric Model
GPS-X Technical Reference