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Abstract Sedimentation is a .phisical treatment process whereby suspended particles of a nansity greater than that of the liquid medium. are removed. There is no upper limit to the amount of settleable. solids that may present ...in~.water to be treate;d by sedimentation, as experience has shown that water containing high concentrations of suspended matter is more easily clarified by sedimentation than that. with low concentrations, simply because there exist greater opportunity for contact among the greater number of particles, especially when the particles ane..finely divided and not being in the colloidal from (Imhoff and Fair; 1949; Babbitt, 1953; Fair and Gayer~ 1954, and Babbitt and Donald, 1955). Sedimentation ~ay be described simply in allow±ng the suspended particles to settle by their own weight. The po asa.bLl.Lcy of such settlement aseume s that tihese particles are of higher spec.Lf’Lcgr~vity than that of liquid contain- .A certain .ingthem and only need t~e. enough to settle. quantity :l,.sof less specific gravity than liquid, this rises to the su+face, and can, therefore also be separated from the liquid. Som~ suspended matter is of precisely the same specific gravity as liquid, in which case it will incline neither to siJ::tknor to rise. The colloidal state may be regarded as an intermediate state be-yween suspension ’and solution. |