GPS-X Technical Reference

Suspended Growth Models 152
Hydrolysis of soluble substrate
Equation 6.36
The hydrolysis of soluble substrate is considered to be first order with respect to the
concentration of soluble substrate and to the concentration of hydrolytic enzymes.
Ammonification of proteins
Equation 6.37
The ammonification of proteins is considered to be proportional to the concentration of
proteins, to the concentration of hydrolytic enzymes and inversely proportional to the
acidogenic biomass concentration. Proteins are regarded as particulate matter with
surface area limitations.
Consumption of monomers by acidogens
Equation 6.38
The consumption rate of monomers is assumed to be proportional to monomers and to
ammonia nitrogen saturation functions and to the concentration of acidogenic biomass.
Consumption of VFAs by methanogens
Equation 6.39
The consumption rate of volatile fatty acids is considered to be proportional to the
volatile fatty acids and ammonia nitrogen saturation functions and to the concentration of
methanogenic biomass.
GPS-X Technical Reference