Published in Scientific Papers. Series E. Land Reclamation, Earth Observation & Surveying, Environmental Engineering, Vol. XI
Written by Bianca-Ștefania ZĂBAVĂ, Paula TUDOR, Gheorghe VOICU, Gabriel-Alexandru CONSTANTIN, Mirela-Nicoleta DINCĂ
The need to separate the solid phases from the liquid ones is probably the most common requirement for separation in the wastewater treatment process, the most common method being by gravity, called sedimentation. Sedimentation rate is an important hydrodynamic quantity for the characterization of particle motion and for the technological design of equipment used to separate heterogeneous systems through the sedimentation process. Our work aims is to determine the sedimentation rate in the case of three types of suspension consisting of water - calcium carbonate, water - soil, water - blue clay, with concentrations of 2%, 4%, 6%, 8% and 10%. The particle size for calcium carbonate and blue clay was 0.2 mm and that of the soil was 0.4 mm. Stokes' law was applied to determine the sedimentation rate of solid particles and the following parameters were determined: material particle density (using the pycnometer), dynamic density and viscosity of the suspension (using the Hoppler viscometer). The obtained results showed that the sedimentation rate is influenced by the concentration, size and density of solid particles, these results being correlated with the results obtained from the literature.
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