chapter  8
26 Pages

Flotation

Examples of particles to be floated include algae; chemical precipitates; coagulant flocs such as alum or ferric, perhaps strengthened with a polymer; and biological flocs. The objective may be either to separate solids and water or to ‘‘thicken’’ the solids, e.g., to raise the solids concentration from say 1% to perhaps 4% (such as in the case of activated sludge).