Liquid purification or separation – Recirculation
Patent
1993-03-24
1995-01-17
Lithgow, Thomas M.
Liquid purification or separation
Recirculation
210197, 210109, 2102212, 2105122, 210703, B01D 17035, C02F 124
Patent
active
053823583
ABSTRACT:
An apparatus for dissolved air floatation (DAF) and for gas-liquid contacting operations by dissolved air floatation. A number of involute flow channels in a container have inlets and outlets positioned at either end for involutional or evolutional flow of a mixture of liquid and dissolved gas. Liquid turbulence and mixing are prevented in order to achieve a near plug-flow condition for maximum separation. Other uses of the method and apparatus include hydraulic flocculation of suspended matters in a liquid, separation of non-floatable suspended matters, oxidation of dissolved organic matter, activated sludge processes, purification of water using a biocide, separation by absorption of gases, stripping by desorption of dissolved gases, and gas-liquid reactions.
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