Method and apparatus for clarifying contaminated liquids

Liquid purification or separation – With alarm – indicator – register – recorder – signal or... – Responsive to fluid flow

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210195R, 210196, 210221P, B03D 124

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active

039869547

ABSTRACT:
A method and apparatus for clarifying liquids contaminated with suspended materials that do not readily separate by gravity, is disclosed. A flowing stream of the contaminated liquid is initially passed to a mixing zone at a predetermined flow velocity and intimately mixed with a gas stream to form a multiphase liquid-contaminant-gas stream. The flow velocity of the multiphase stream is then alternately increased and decreased with substantially simultaneous decrease and increase of pressure to ultimately disperse and dissolve the gas stream throughout the liquid and contaminant phases of the stream. The multiphase stream is next dispersed into a novelty designed flotation tank means having a U-shaped quiescent vessel of increased volume flow area maintained at a reduced pressure whereby the dissolved gas is caused to break out of solution in the form of finely dispersed gravity density reducing microscopic bubbles which, along with the dispersed gas bubbles in the stream, attach to themselves and the suspended contaminants thereby increasing the specific gravity differential between the contaminants and liquid. The stream is caused to pass through the quiescent vessel at a gradually reducing flow velocity with diminishing gentle turbulence so as to allow the contaminants and liquid to separate by gravity, the contaminants forming a contaminant layer floating on the surface of the liquid. The contaminant layer is then separated from the liquid. The novel apparatus includes means for recirculating a portion of the liquid from the quiescent vessel for further treatment until a desired amount of clarification is obtained.

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patent: 3623608 (1971-11-01), Waterman
patent: 3794171 (1974-02-01), Kimura et al.

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