Abstract
The rheology of waste activated sludge (WAS) and of humus and digested sludges taken from full scale sewage treatment plants at solids concentrations between 1,5% and 9% (g/g) was investigated using a rotational viscometer. The results indicated that all the sludges behaved as pseudoplastic thixotropic fluids. The pseudo-plastic parameters, fluid consistency index K and flow behaviour index n, were related to concentration, and in the case of WAS to the sludge volume index (SVI). Concentration and SVI were found to be the most important variables. These relationships allow the prediction of resistency to flow in pipelines of WAS with various SVI values and of humus and digested sludges, within the range of solids concentrations tested.
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