An experimental study of low concentration sludge settling velocity under turbulent condition
Lisha Guo1, Daijun Zhang, Danyu Xu
1Department of Environmental Science, Chongqing University, Chongqing, China.
Abstract:
Particle Image Velocimetry (PIV) was used to study the settling of activated sludge flocs under turbulent flow conditions. Experimental results showed that a larger particle diameter led to a higher settling velocity while the higher turbulence intensity led to lower settling velocity. Based on the measurements a mathematical relation has been derived which correlates the settling velocity for individual sludge flocs under turbulent conditions through a modified Vesilind equation. Settling velocity shows a power-type relation to sludge particle diameter and an exponential-type relation with turbulence intensity and sludge concentration.
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