Paweł Wolski, Iwona Zawieja
Deposits of water and wastewater treatment are dispersed systems of a very complex structure. The properties of this structure are mainly dependent of the phenomena occurring in the processes of the formation of deposits, under the influence of several factors. The use of rheology in water and wastewater treatment technologies associated with the nonnewtonian nature of the flow of sewage produced mainly in the processes of coagulation and sedimentation. A large number of physical, chemical and biological theory excludes the possibility of determining the rheological parameters, and therefore knowledge of the rheological characteristics of sludge from water and wastewater treatment must be based on experimental studies using appropriate viscometers. This paper presents a study to determine the rheological parameters undergone initial sludge conditioning and fermentation. The study was conducted on excess sludge undergone initial ultrasonic field conditioning, heat, and polyelectrolytes. Conditioned sludge is subjected to the stabilization process in the bioreactor, and determines the rheological parameters (shear stress, viscosity, yield point). The use of pre-conditioning resulted in an increase of shear stress tested sewage sludge. This dependence has been in particular for sludge conditioned polyelectrolytes. Experimentally determined values correlated with the values set out in the rheological models.
parametry reologiczne; osady ściekowe
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