GPS-X Technical Reference

135 Suspended Growth Models
48 state variables (21 soluble + 27 particulate)
56 processes
Two-step nitrification using AOB, NOB
Two-step denitrification
Methanol degradation process with methylotroph biomass
ANAMMOX process
Anaerobic digestion processes with gas phase modelling for N 2, CO 2, H 2, and
CH 4
pH and alkalinity estimation in both liquid and solid train
Precipitation of MgNH 4PO 4. 6H 2O, CaCO 3, MgHPO 4. 3H 2O, CaPO 4, AlPO 4,
FePO 4, Al(OH) 3 and Fe(OH) 3
Unified composite variable calculation
The MANTIS2 model is is implemented in MANTIS2LIB. The MANTIS2 model allows
estimation of pH in both the liquid and solid train, therefore it is possible in MANTIS2 to
use additional influent objects like acid feed, alkali feed to estimate the chemical required
for pH adjustment.
The basic structure of the comprehensive MANTIS2 model is based on the following
published models:
1. ASM2d – basic reactions for biological carbon, nitrogen, and phosphorus
removal
2. UCTADM1 – Anaerobic digestion processes
3. Musvoto Model – Inorganic precipitation processes
In addition to the above, reference is made to other accepted models (i.e. newgeneral
model, ADM1 and UCTCN and MANTIS) in formulating the model structure and
finalizing the default stoichiometry and kinetics of model parameters. The modelling
approaches for two-step nitrification, two-step denitrification, denitrification on methanol
and ANNAMOX are adopted from recent research studies.
GPS-X Technical Reference