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This paper presents the results of examinations of sewage sludge from cellulose and paper industry. The aim of the study was to determine rheological models (the Ostwald-de Waele, Bingham and Herschel-Bulkley models) of non-conditioned sewage sludge and the sludge exposed to the effect of the ultrasound field at its different intensities and then stabilized in flasks and in the bioreactor. Evaluation...
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