Apparatus and method for the gravity settling of suspended solid

Liquid purification or separation – Processes – Separating

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210520, B01D 2124

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active

042631378

ABSTRACT:
An apparatus and method for improving the settling out of suspended solids in a liquor are described. A diffuser of a particular type is used to introduce a liquor containing a flocculant suspension into a sedimentation tank with low turbulence. The diffuser is so shaped that the liquor velocity can be reduced in a controlled manner. Liquid shear conditions are made so low inside the diffuser that excessive break-up of flocs does not occur. The diffuser has a flare angle and a discharge opening to throat dimensional ratio whereby these conditions of low turbulence and formation can be established. Several embodiments of sedimentation apparatus employing such diffuser are described.

REFERENCES:
patent: 1754119 (1930-04-01), Pink
patent: 2098467 (1937-11-01), Sayers et al.
patent: 2304248 (1942-12-01), Entwistle et al.
patent: 2343836 (1944-03-01), Weber
patent: 2947380 (1960-08-01), Fullaway
patent: 3314547 (1967-04-01), Kivell
patent: 3456798 (1969-07-01), Urdanoff
patent: 3534861 (1970-10-01), Hubbell
patent: 3915858 (1975-10-01), Condolios
"Optimum Design of Straight Walled Diffusers", S. J. Kline et al., The Journal of Basic Engineering, p. 321, Sep., 1959.

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