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GPS-X Technical Reference

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Attached Growth Models 222<br />

As seen in Figure 7-2, the real dimensions of the trickling filter require inputs such as:<br />

the filter bed depth, filter bed surface and specific surface of media. Together, these<br />

three parameters will provide an estimation of the total biofilm surface area in the model.<br />

The liquid retention time in filter refers to the retention time of the liquid flowing past<br />

the biofilm, the maximum attached liquid film thickness refers to the liquid film which<br />

is not moving past the biofilm due to friction (no-slip layer) and the maximum biofilm<br />

thickness will be reached only with infinite sloughing. The density of biofilm and dry<br />

material content of biofilm are used to convert the concentration of each state variable<br />

to a volume measurement.<br />

Figure 7-2 - Physical Dimensions of the Tricking Filter<br />

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

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