Method for treatment of waste water by activated sludge process

Details Method for treatment of waste water by activated sludge process Method for treatment of waste water by activated sludge process

1994-12-21

1996-11-12

Wyse, Thomas G.

Liquid purification or separation

Processes

Treatment by living organism

210626, 210631, C02F 312

Patent

active

055736700

ABSTRACT:
Waste water is treated by an activated sludge process, the equipment for which is provided with an aeration tank unit comprised of three tanks of a first tank, a second tank and a third tank, said waste water and microorganisms being fed into the first tank while the ratio of aeration in the first tank ranges from 0.5 to 0.8 by volume/minute relative to the amount of liquid in the first tank, the ratio of aeration in the second tank ranges from 0. 1 to 0.4 by volume/minute relative to the amount of liquid in the said second tank and the ratio of aeration in the third tank ranges from 0.1 to 0.3 by volume/minute relative to the amount of liquid in the third tank, the improvement which comprises carrying out said treatment by passing air containing ozone in an amount of from 0.01 to 0.16 wt. % relative to the amount of oxygen during the aeration into the first tank.

REFERENCES:
patent: 3805481 (1974-04-01), Armstrong
patent: 5160621 (1992-11-01), Nagasaki et al.

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