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GPS-X Technical Reference

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Sedimentation and Flotation Models 264<br />

Figure 8-6 - Layered Flotation Model<br />

The model is based on the solids flux concept: a mass balance is performed around each<br />

layer, providing for the simulation of the solids profile throughout the DAF unit under<br />

both steady-state and dynamic conditions.<br />

The model is based on traditional solids flux analysis, with an additional component for<br />

flotation. Model detail is provided in the previous section of this chapter devoted to onedimensional<br />

sedimentation models.<br />

The solids flux due to the bulk movement of the liquid is calculated by multiplying the<br />

solids concentration by the liquid bulk velocity (flow divided by area), which may be up<br />

or down depending on the position relative to the feed layer.<br />

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

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