GPS-X Technical Reference

Suspended Growth Models 146
37. Decay of fermentive biomass: The stoichiometry and kinetic expression for
the decay process of fermentative biomass is based on the same principles as
for other biomass types.
38. Growth of acetogens on propionate: This process (Acetogenesis) is the
process whereby the acetogens convert propionic acid under low hydrogen
partial pressure. The kinetic rate expression for the process includes a H 2
inhibition term and a propionic acid saturation term.
39. Decay of acetogens: The stoichiometry and kinetic expression for the decay
process of fermentative biomass is based on the same principles as for other
biomass types.
40. Growth of hydrogenotrophic methanogens: In this process
hydrogenotrophic methanogens grow by converting H 2 and CO 2 to CH 4. The
stoichiometry of the process is based on the chemical reaction describing this
process. The kinetic expression for the process uses a hydrogen saturation
term.
41. Decay of hydrogenotrophic methanogens: The stoichiometry and kinetic
expression for the decay process of fermentative biomass is based on the
same principles as for other biomass types.
42. Growth of Acetoclastic methonegens: In this process the the acetic acid is
converted to methane and CO 2 by acetoclastic methanogens. The kinetic
expression of the process includes an acetate saturation term.
43. Decay of acetoclastic methanogens: The stoichiometry and kinetic
expression for the decay process of fermentative biomass is based on the
same principles as for other biomass types.
Processes mediated by anaerobic autotrophic microorganisms
A new type of anaerobic autotrophic biomass type is included in MANTIS2 to perform
anaerobic ammonium oxidation (ANAMMOX) process. The process stoichiometry is
described in Strous et al. (1998) as below.
1NH4 + + 1.32 NO2 - + 0.066 HCO3 - + 0.13 H + 1.02 N2 + 0.26 NO3 - + 0.066 CH2O0.5N0.15 +2.03 H2O
According to the above reaction, a mole of ammonia-N is oxidized to 1.02 mole of N 2
using 1.32 mole of nitrite-N. The reaction also produces 0.26 mole of nitrate-N and leads
to growth of autotrophic biomass.
GPS-X Technical Reference