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GPS-X Technical Reference

GPS-X Technical Reference

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Operating Cost Models 364<br />

Chemical Dosage Cost<br />

Some unit process objects in <strong>GPS</strong>-X allow for chemical addition as part of treatment<br />

(some influents, equalization tank, DAF, dewatering units, etc.).<br />

In each case, the total chemical dosage cost is:<br />

Equation 13.2<br />

where:<br />

chemicalcostperday<br />

chemprice<br />

chemdosagerate<br />

= chemical dosage cost ($/d)<br />

= chemical price ($/kg)<br />

= hydraulic head (kg/d)<br />

This daily cost is integrated over time to determine a total cost for the simulation.<br />

Sludge Disposal<br />

Several objects in <strong>GPS</strong>-X have connection points which represent thickened or dewatered<br />

sludge (e.g. dewatering unit). A sludge disposal cost can be associated with these flows to<br />

determine a sludge handling cost.<br />

The cost is determined by multiplying the per-unit disposal cost by the rate of sludge<br />

disposal:<br />

Equation 13.3<br />

where:<br />

disposalcostperday<br />

= sludge disposal cost ($/d)<br />

disposalcost = disposal price ($/m 3 )<br />

sludgerate<br />

= sludge disposal rate (m 3 /d)<br />

This daily cost is integrated over time to determine a total sludge disposal cost for the<br />

simulation.<br />

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

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