Apparatus and method for clarifier sludge collection

Details Apparatus and method for clarifier sludge collection Apparatus and method for clarifier sludge collection

1991-09-10

1993-06-15

Dawson, Robert A.

Liquid purification or separation

Processes

Separating

210520, 210528, 210525, B01D 3700, B01D 1200

Patent

active

052194701

ABSTRACT:
A sludge removal apparatus for a clarifier tank includes a rotatable or stationary sealed sludge collection box submerged in the tank and surrounding a vertical, central influent column. The collection box is positioned at any elevation between the tank bottom to a position just below the liquid/solids level in the tank. A rotatable rake arm or pick-up pipe or sludge collection duct may be affixed to and rotates with the box and a driving cage to push or pick-up sludge at the tank bottom for transport to the collection box. A substantially constant flow of sludge may be provided in the collection box by valved or adjustable orifice control over the flow of sludge from the pick-up pipe(s) or duct(s) or center tank cone. A fixed flanged manifold spool with spaced branches is positioned between flanged vertical sections of the center column and sludge is transported from the collection box through the branches to a concentric sludge withdrawal pipe extending downwardly within the center column.

REFERENCES:
patent: 3025966 (1962-03-01), Kivell
patent: 3314547 (1967-04-01), Kivell
patent: 3486628 (1969-12-01), Darby
patent: 3487017 (1969-12-01), Thorn et al.
patent: 3770131 (1973-11-01), Davis et al.
patent: 3926805 (1975-12-01), Walker
patent: 4193877 (1980-03-01), Lillywhite
patent: 4271027 (1981-06-01), Kelly
patent: 4302328 (1981-11-01), Van Note
Mark J. Hammer, Water and Waste Water Technology, Second Edition, (1986) pp. 442-443.
Publication Bulletin No. 315-121--cover page p. 9 and last page .COPYRGT.1981, 1984 REX/ENVIREX.

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