Liquid purification or separation – Recirculation
Patent
1983-05-11
1985-07-30
Castel, Benoit
Liquid purification or separation
Recirculation
210219, 210220, 210926, 261 91, 261 93, 261123, 261 36R, C02F 320
Patent
active
045320381
ABSTRACT:
In aerobic wastewater treatment systems, such as sewage treatment, liquid in a channel spanned by a liquid-tight barrier is moved past the barrier by a liquid-gas contact pump, thus dissolving a gas in the liquid and creating a differential head that provides flow energy for moving the liquid in plug-type flow through the channel, which is preferably a continuous-flow pipeline or a circuit-flow oxidation ditch, without energy-wasteful vertical circulation. The barrier further provides a structure for mounting submerged static aerators or a draft tube, in combination with a surface aerator, such as a submerged turbine or surface-disposed impeller aerator, as the liquid-gas contact pump. The barrier is disposed at sufficient depth, when combined with static aerators or when telescopically attached to the draft tube of a floating surface aerator, to enable the liquid level to be selectively varied so that flow equalization to an oxidation ditch and wastewater storage therewithin are provided. Because of the plug-type flow and capability of maintaining it at 0.75-1.25 feet per second, a grit settling capability can be combined with aerobic digestive treatment within the oxidation ditch by placing a grit settling system slightly past the raw sewage inlet in a channel of the oxidation ditch. By employing a plurality of oxidation ditches, of which one is sequential used for clarification, and by incorporating a grit settling system within each of the oxidation ditches, the entire wastewater output from a large municipality, slaughterhouse, or poultry processing plant, for example, can be processed without preliminary or supplementary treatment in any other apparatus.
REFERENCES:
patent: 1643273 (1927-09-01), Imhoff
patent: 1900809 (1933-03-01), Hammerly
patent: 2263534 (1941-11-01), Aldridge
patent: 3510110 (1970-05-01), Klein
patent: 3840216 (1974-10-01), Smith et al.
patent: 3990974 (1976-11-01), Sullins
patent: 4110980 (1978-09-01), Foulke
Soo, S. L., "Power Spray Cooling", published in American Society of Mechanical Engrs., Publication Bulletin, 75-WA/PWR-3, Paper Presented 11-30-75.
Castel Benoit
Lelong Marion P.
Murray William H.
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