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GPS-X Technical Reference

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Suspended Growth Models 114<br />

Alpha factor (fine bubble): Specifies the value of the wastewater correction factor for<br />

the fine bubble K La. The default value is 0.6.<br />

Alpha factor (coarse bubble): Specifies the value of the wastewater correction factor<br />

for the coarse bubble K La. The default value is 0.8.<br />

Alpha factor (jet): Specifies the value of the wastewater correction factor for the jet<br />

K La. The default value is 0.85.<br />

Alpha factor (user-defined): Specifies the value of the wastewater correction factor for<br />

the user-defined K La. The default value is 0.6<br />

Fouling constant: Diffuser fouling factor. Default value is 1 (i.e. no fouling)<br />

Depth correction factor for user-defined (Fine Bubble/Coarse Bubble): When the<br />

user-defined diffuser type is being used, this parameter selects whether Equation 6.8 or<br />

Equation 6.9 is used to calculate the depth correction factor for the DO saturation<br />

concentration.<br />

Oxygen Transfer Efficiency (SOTE) Sub-Section (Under More…)<br />

SOTE type (Constant/Correlation): Specifies whether the SOTE is set by the user or<br />

calculated by a correlation. The correlation used depends on the diffuser type selected.<br />

Standard oxygen transfer efficiency: When the SOTE type is set to constant, this<br />

value is used for the SOTE.<br />

Diffuser submergence: Specifies the depth of submergence of the diffusers.<br />

Method of specifying diffuser setup (Enter Number of Diffusers/Enter Diffuser<br />

Density): Allows the user to either specify the number of diffusers or the diffuser<br />

density (diffuser area/tank area). It is important to enter the diffuser density or the<br />

number of diffusers if an SOTE correlation is being used or the user requires <strong>GPS</strong>-X to<br />

display accurate values of the airflow per diffuser and the number of diffusers per unit<br />

area.<br />

Diffuser density (diffuser area/tank area): When the method of specifying the diffuser<br />

setup has been selected as diffuser density, this parameter allows the user to enter the<br />

diffuser density as a fraction or a percentage. Diffuser densities between 5 % and 25 %<br />

are typical.<br />

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

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