Means for separation of gas and solids from waste mixed liquor

Details Means for separation of gas and solids from waste mixed liquor Means for separation of gas and solids from waste mixed liquor

1980-06-13

1981-07-21

Castel, Benoit

Liquid purification or separation

Processes

Treatment by living organism

210625, 210627, 210629, 2101953, 210747, 210170, 261124, C02F 322

Patent

active

042797543

ABSTRACT:
In a long vertical shaft activated sludge bioreactor for the treatment of waste water and the flotation/separation of solids therefrom, an improvement is provided whereby fluctuations in flow through the bioreactor are maintained level without the use of complex control mechanisms and whereby separation from the effluent of dispersed air bubbles occurs directly in the flotation/separation vessel rather than in the shaft or an auxiliary vessel. The improvement provides for the installation of a holding reservoir between the shaft and the flotation/separation vessel. Influent passes through the reservoir on its way to the bioreactor and some make-up effluent from the flotation/separation vessel is directed into the holding reservoir as the level of liquid in the reservoir falls. In addition, means are provided in the separation/flotation vessel to split off large dispersed gas bubbles which would otherwise disrupt sludge flotation.

REFERENCES:
patent: 2793185 (1957-05-01), Albrektsson et al.
patent: 2813074 (1957-11-01), Banks et al.
patent: 3979293 (1976-09-01), Boulenger
patent: 4086160 (1978-04-01), Roesler
patent: 4216085 (1980-08-01), Chittenden
patent: 4230563 (1980-10-01), Roesler
Proceedings of the 31st Industrial Waste Conference, May 4, 5 and 6, 1976, Purdue University; Ann Arbor Science; pp. 344-351.

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