Sludge thickening is modeled dynamically and results of simulations are compared to observations of sludge blanket in different clarifier types. Thickening is described to depend on the inverse of thickening factor and solids concentration. Thickening factor can be measured in test cylinder or estimated on DSVI. Short circuiting inside the sludge blanket is modeled by combination of PFR- and CSTR-blocks of thickening. The results indicate that sludge blanket behavior can be explained by thickening.

activated sludge process, clarifier, modeling, thickening
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© IWA Publishing 1996
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