Physical Characteristics of Municipal Waste Water
Settleable solids are those solids that will settle to the bottom of a cone-shaped container (called Imhoff cone) in a 60-minute period. Settleable solids, expressed as ml/l, are an approximate measure of the quantity of sludge that will be removed by primary sedimentation. Total solids can be further classified as suspended and filterable solids by passing a known volume of liquid through a filter. The solids content of a medium-strength waste water may be classified approximately as shown in Figure1(1)
(1). Waste Water Engineering: Treatment, Disposal and Reuse, Metcalf & Eddy, Inc., Third Edition, page 56.
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