Co where:

Cout = Concentration of thickened solids removed, lb/ft3

Thus, a limiting solids flux rate GL exists and can be determined for any combination of values for the pertinent variables. The following equation gives the required thickener area AT (in ft2):


MTw = hourly solid waste input into thickener, lb/hr

Environmental engineers can derive the required design data from settling tests conducted in cylinders with diameters of at least 3 to 6 in, and preferably greater, having a depth of from 3 ft to full-scale depth. These cylinders should be equipped with a stirring device having a tip speed of about 40 ft/hr. Figure 7.46.2 plots the data derived from these tests.

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