Abstract
Gravity thickening and pressure filtration are described with a one-dimensional nonlinear finite strain consolidation model. Basic assumptions of a consolidation model are discussed. The consolidation coefficient κ for different types of sludges was found to vary less with solids concentration than the permeability and the compressibility. This leads to a simplified model. A comparison of model to experimental results reveals the basic validity of the outlined approach and serves to discuss the model limits. For pressure filtration a method to determine the κ-value of a given sludge from filter experiments is verified.
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