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GPS-X Technical Reference

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<strong>GPS</strong>-X Composite Variable Calculations 54<br />

Figure 4-11 shows the scheme for estimation of soluble part of Total Organic Carbon (STOC),<br />

particulate part of Total Organic Carbon (XTOC), and Total Organic Carbon. In the estimation of<br />

STOC, the stoichiometry ratio of icsac, icsmet, icspro are estimated based on the substrate<br />

compositions. The stoichiometry factor of icscol, icsi and icss on the other hand needs to be set<br />

by direct user input. These factors can be accessed and changed in<br />

System > Input Parameters > Influent stoichiometry menu. In the estimation of XTOC, each<br />

biomass concentration is multiplied by a corresponding stoichiometry factor representing the C<br />

content in the corresponding biomass. For example, icpxbh is the stoichiometry factor<br />

representing the C content in the heterotrophic biomass, xbh. The C fraction for each biomass<br />

type is calculated based on the biomass composition. The default composition of biomass can be<br />

accessed and changed in the System > Input Parameters > Global Fixed stoichiometry menu.<br />

For the particulate states of xi and xs, the user can directly enter the C content in the<br />

System > Input Parameters > Influent stoichiometry menu. The composite variable of TOC is<br />

estimated by the sum of XTOC and STOC.<br />

Table 4-17 presents the summary of the stoichiometry parameters used in the MANTSI2LIB and<br />

access menus for changing the default values.<br />

Table 4-17 - Access Menus for Different Stoichiometry Parameters in MANTIS2LIB<br />

Stoichiometry<br />

Parameter<br />

yhglobal<br />

fuu<br />

fssbodtosscod<br />

fpsbodtopscod<br />

fbbodtobcod<br />

COD to VSS ratio for<br />

biomass<br />

COD to VSS ratio for<br />

xs and xi<br />

VSS to SS ratio for<br />

biomass<br />

N fraction in biomass<br />

N fraction in xi, si<br />

P fraction in biomass<br />

P fraction in xi, si<br />

C fraction in biomass<br />

and sac, spro, smet<br />

C fraction in<br />

xcol,xss,si,xi,xs<br />

Access Menu<br />

System > Input Parameters > Global Fixed stoichiometry<br />

System > Input Parameters > Global Fixed stoichiometry<br />

System > Input Parameters > Global Fixed stoichiometry<br />

System > Input Parameters > Global Fixed stoichiometry<br />

System > Input Parameters > Global Fixed stoichiometry<br />

System > Input Parameters > Global Fixed stoichiometry<br />

(Calculated based on biomass composition)<br />

System > Input Parameters > Influent stoichiometry<br />

System > Input Parameters > Global Fixed stoichiometry<br />

(Calculated based on biomass composition)<br />

System > Input Parameters > Global Fixed stoichiometry<br />

(Calculated based on biomass composition)<br />

Influent Characterization menu of influent object<br />

System > Input Parameters > Global Fixed stoichiometry<br />

(Calculated based on biomass composition)<br />

Influent Characterization menu of influent object<br />

System > Input Parameters > Global Fixed stoichiometry<br />

(Calculated based on biomass/substrate composition)<br />

System > Input Parameters > Influent stoichiometry<br />

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

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