Multi-eductor system

Liquid purification or separation – Recirculation – From bottom of separator

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Details

210220, 210629, 261 77, 261123, C02F 320

Patent

active

057798907

ABSTRACT:
Improved gas distribution and mixing is achieved in a gas/liquid mixing basin particularly for aerobic or anaerobic sewage digesters. In addition to a draft tube positioned generally centrally in the aeration or anaerobic basin and served by one or more gas-releasing diffusers, the system of the invention includes peripheral draft tubes surrounding the central draft tube, each tube having at least one gas diffuser within. The circulation of liquid and gas bubbles from the larger, central draft tube is supplemented by circulation from the peripheral draft tubes. In particular, "dead areas" or less active areas of the liquid, which are not sufficiently reached by gas-mixing from a single draft tube in many basin configurations, are reached by circulation from the peripheral draft tubes and such dead areas are virtually eliminated. As a result, power requirements can be reduced when compared to double throw or single drop systems, thus increasing overall system efficiency while achieving the desired level of liquid aeration or gas dispersion. In addition, the inclusion of the peripheral draft tubes allows versatility in achieving the desired degree of mixing in a wide range of different basin configurations.

REFERENCES:
patent: 2144385 (1939-01-01), Nordell
patent: 3043433 (1962-07-01), Singer
patent: 3055502 (1962-09-01), Cunetta
patent: 3337449 (1967-08-01), Kappe
patent: 3415378 (1968-12-01), Fukuda
patent: 3696029 (1972-10-01), Walker
patent: 4720360 (1988-01-01), Melber
patent: 4863644 (1989-09-01), Harrington et al.
patent: 4933076 (1990-06-01), Oshima et al.
patent: 4938899 (1990-07-01), Oros et al.
patent: 5200081 (1993-04-01), Stuth
"Breakthrough in Sewage Treatment, Cash, Land and Energy Saved," from Water Services, Apr. 1975, pp. 132 and 140.

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