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The floc terminal sedimentation velocity and the residual turbidity of flocculated suspension are important properties in a flocculator. Residual turbidity is the turbidity resulting from the flocs that failed to reach the capture velocity, which is approximately 0.12 mm/s for the plate settlers in AguaClara plants. Residual turbidity is a measurement of the anticipated performance of the plant if the effluent from the flocculator passed into the tube settlers without any other sedimentation process. The Spring 2009 team quantitatively evaluated the effect of shear velocity on these parameters. To do so, they used the flocculation residual turbidity meter (FReTA) developed by the AguaClara team and a data processor to analyze these parameters automatically ( see data acquisition)
Our goal for these first experiments was to familiarize ourselves with the apparatus and the data processor (MathCAD file) made by the previous team (Spring 2009) and to try to replicate one of their last experiments to make sure that the apparatus and the MathCAD file were working properly.
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