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The aim of this paper was to determine the basic granulometric curves related to the dried sewage sludge and particles size distribution according to Rosin-Rammler, which belongs to the most widely used methods for the statistical distribution of particles in the samples. For this purpose, series of accurate sieves have been chosen. In the next phase, gross calorific value of individual fractions of sewage sludge and subsequently mixed sample, have been determined. Individual measurements were statistically evaluated.