Liquid purification or separation – Recirculation – From bottom of separator
Patent
1978-09-27
1982-06-29
Spitzer, Robert H.
Liquid purification or separation
Recirculation
From bottom of separator
210220, 261 77, 261121R, 261DIG75, C02F 322, B01F 304
Patent
active
043371523
ABSTRACT:
A gas-liquid mixing process and apparatus, particularly applied to aeration, especially associated with activated sludge waste-water treatment, wherein complete, efficient mixing of the gas and liquid is achieved initially in a pre-mixing draft tube and secondly in an outer mixing vessel by imparting a turbulent, random generally outward and upward radial motion to the liquid and gas contents of the vessel. A portion of the contents of the vessel is withdrawn and recirculated through the pre-mixing draft tube substantially axially vertically situated within the outer mixing vessel. A lower end of the draft tube has a nozzle opening which produces a net flow which is an axially symmetrical radial jet of recirculating contents, thereby establishing the desired turbulent random motion. In the case of aeration in waste-water treatment, air or other oxygen-containing gas is introduced into the draft tube. The complete and consistent high efficiency of the apparatus and the method used thereby provides significant results in that the energy/dissolved oxygen and detention time per tank is significantly reduced.
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Frebar Holding AG
Spitzer Robert H.
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