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GPS-X Technical Reference

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Suspended Growth Models 202<br />

Estimate the SAE<br />

The SAE is estimated based on the correlation provided by Praxair. The expression is<br />

valid for SOTE in the range of 86% to 100%. If the user specified SOTE is less than 80%<br />

then the SAE is bounded at 7.11 kg/kWh.<br />

Equation 6.63<br />

where:<br />

SAE = Specific aerator energy (wire), kgO 2/kW-hr<br />

SOTE = Standard oxygen transfer rate (%)<br />

The mechanical power requirement is estimated using the following expression:<br />

Equation 6.64<br />

where:<br />

P mechanical<br />

SAE<br />

= mechanical power (kW)<br />

= mechanical aerator oxygen transfer rate (kg O2/kW·h)<br />

CF 2 = conversion factor (24,000)<br />

η motor<br />

= motor efficiency<br />

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

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