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GPS-X Technical Reference

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Suspended Growth Models 214<br />

POWDERED ACTIVATED CARBON<br />

The powdered activated carbon (PAC) object is a normal CSTR object that has been enhanced<br />

with powdered activated carbon addition. The carbon sorbs one or more components using a<br />

competitive sorption isoterm. The sorbed components are then coverted to particulate inerts<br />

before moving downstream. The version of the PAC model is different in the IP libraries, where<br />

3 user-defined components can be added to the existing sorbable set of state variables, and used<br />

as toxic inhibitors to biological activity.<br />

Sorption Isotherms<br />

In the CN and CNP libraries, the only components being sorbed from solution onto the<br />

PAC are ss (soluble substrate) and si (soluble inerts). In this two-component system, the<br />

sorption rates are:<br />

Equation 6.78<br />

Equation 6.79<br />

where:<br />

adsrate SI = adsorption rate of SI (gCOD/m 3 /d)<br />

adsrate SS = adsorption rate of SS (gCOD/m 3 /d)<br />

MA SI<br />

MA SS<br />

= maximum sorption capacity for SI (gCOD/gPAC)<br />

= maximum sorption capacity for SS (gCOD/gPAC)<br />

KL SI = SI sorption half-sat coefficient (gCOD/m 3 )<br />

KL SS = SS sorption half-sat coefficient (gCOD/m 3 )<br />

X PAC = PAC concentration in liquid (gPAC/m 3 )<br />

R ADS<br />

= adsorption rate (1/d)<br />

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

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