Method maintaining a constant gas to solids ratio in effluent fr

Details Method maintaining a constant gas to solids ratio in effluent fr Method maintaining a constant gas to solids ratio in effluent fr

1980-06-13

1981-09-01

Therkorn, Ernest G.

Liquid purification or separation

Processes

Treatment by living organism

210629, 210744, 210109, 2101953, 210220, C02F 312

Patent

active

042870704

ABSTRACT:
An improved method and apparatus is provided for maintaining a constant gas-to-solids ratio in the effluent from a long vertical shaft waste treatment bioreactor. In a vertical bioreactor wherein waste is circulated under air-injected oxidation conditions around a loop comprising adjacent downcomer and riser chambers connected at their terminals and operatively connected to a separation apparatus, the improvement comprises withdrawing treated effluent from the riser chamber into a cylindrical vessel from whence the effluent is directed either to the separation chamber or into the influent stream depending on the total level of fluid in the bioreactor. Removal of large air bubbles from the effluent is also effected in the cylindrical vessel. The method provides improved gas-to-solids ratio in the effluent and improves sludge flotation in the separation apparatus.

REFERENCES:
patent: 2746605 (1956-05-01), Baum
patent: 3617539 (1971-11-01), Grutsch
patent: 3864247 (1975-02-01), Fuchs
patent: 3892659 (1975-07-01), Kirk
patent: 3966598 (1976-06-01), Ettelt
patent: 4071443 (1978-01-01), Gorski
Proceedings of the 31st Industrial Waste Conference, May 4, 5, 6, 1976, Purdue University, Ann Arbor Science, U.S.A., p. 344-351.

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