Liquid purification or separation – With means to add treating material – Directly applied to separator
Patent
1996-04-26
1998-12-08
Lithgow, Thomas M.
Liquid purification or separation
With means to add treating material
Directly applied to separator
210703, 210256, 210259, 210262, 210294, 210521, C02F 900, C02F 124, B01D 2108, B01D 17035
Patent
active
058464131
ABSTRACT:
A compact dissolved-air-flotation (DAF) clarifier and clarification process utilize three zones for clarification which operate in sequence in a single clarifier. Raw water with suspended solids enters a flocculator at the center of an annular tank where microscopic air bubbles introduced to the inflow float flocked contaminants to form a floating sludge layer. A first clarification, calming and degassing occur here. The water then flows radially outwardly into the tank where further quiet clarification occurs. A third level of clarification occurs in a lower portion of the tank, specifically, in a set of plate-like lamellae, radial and conical, which form inclined channels where a final clarification occurs. The bottom wall of the tank has a set of apertures which allow a gravity flow of clarified water through a layer of pressurized gas to an underlying collection compartment. Level sensors control a valve in the clarified outflow line and an air bleed from the pressurized gas layer to regulate liquid levels in the clarifier. A set of rotating paddles push the sludge layer up a ramp to an inclined discharge conduit. Alternatively, a suction head with a mechanical skimmer sweeps around the tank to draw the sludge through a central hollow pipe to a discharge conduit. An offset drive operating through a belt rotates the sludge removal mechanism and the lamellae.
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Lenox Institute of Water Technology, Inc.
Lithgow Thomas M.
Manus, Esq. Peter J.
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