Author(s): P. R. Thomas; P. Sutcliffe
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Abstract: A laboratory technique was devised to investigate, under various hydraulic conditions, the sett- ling patterns of suspended solids in a "model" sedimentation tank. The sewage solids were simulated by plastic particles of different shapes with densities slightly greater than that of water. The tank was made of glass with provision for variations in the inlet design, depth of flow and rate of discharge. The settling patterns recorded on video equi pment indicated that for all types of inlet, the tank length could be reduced by about half from the range of cases investigated. The best performance was attained with either the weir or pipe inlet submerged, provided the latter was not too close to the base of the tank, or with a pipe inlet positioned at the water sur face. A mathematical model was es tablished relating mean settling length to overflow rate.
Year: 1985