October 13 - 15 Wiesbaden Germany
Laboratory scale evaluation of inclined settling
T. Sobisch, D. Lerche, LUM, Berlin/Germany
The principle of inclined settling is often used in practise to increase capacity and efficiency of settling aggregates. The settling rate in inclined-plate (lamella) and tube settlers is influenced by two factors, the effect of gravity acting on the particles and the settling rate due to the presence of inclined surfaces. The increase in settling rate exhibits a complex dependence on material properties (solids density and size distribution, concentration, surface properties, liquid properties) and the angle of inclination. So far adjustment of operating conditions is done empirically or based on pilot or field scale experiments. A preselection based on lab scale experiments would be beneficial.
The LUMiReader instrument can measure space and time resolved extinction (transmission) profiles (STEP technology) in multiple channels using near infrared (NIR) or visible light. This way it measures changes in turbidity and the movement of the boundary towards the supernatant. Even more the angle of inclination can be varied between 0 and 30° from the vertical.
Investigations on settling as function of angel of inclination were carried out on lime suspensions with varying solids concentration.
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