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GPS-X Technical Reference

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285 Digestion Models<br />

Kinetic and Stoichiometric Parameters<br />

The kinetic parameters (shown in Figure 10-9) are found under Parameters sub-menu<br />

item kinetic. The maximum specific growth rate for methanogens (mumh) and the<br />

rate constant for hydrolysis of vss (kco) are defined for 35 degrees Celsius and<br />

corrected by the model using the Arrhenius equation with the temperature coefficients<br />

indicated at the bottom of this menu (tmumh & tkco). The rest of the kinetic parameters in<br />

the basic model are not temperature-dependent.<br />

Figure 10-9 - Kinetic Parameters<br />

The stoichiometric parameters (Figure 10-10) are found under Parameters sub-menu<br />

item Stoichiometric. The first set of stoichiometric parameters consists of conversion<br />

factors: particulate COD (xcod) to vss ratio (icvcon), BOD 5 (bod) to BOD ultimate (bodu)<br />

ratio (fbodcon).<br />

Conversion factors that are unique to the digester basic model are the mass acetic acid to<br />

COD factor (ac2cod), the molecular weight of fatty acids (mwfat) and the gas constant<br />

(gvol).<br />

Using these factors and the parameters defined in the Effluent sub-menu, the basic<br />

digester model establishes the values for the composite parameters. These parameters<br />

will modify the stoichiometry of the effluent stream.<br />

<strong>GPS</strong>-X <strong>Technical</strong> <strong>Reference</strong>

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