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

1989-01-31

1992-11-03

Wyse, Thomas

Liquid purification or separation

Processes

Treatment by living organism

210626, C02F 312

Patent

active

051606216

ABSTRACT:
A method for treatment of waste water by an activated sludge process wherein the aeration tank system is composed of three tanks: a first tank, a second tank and a third tank, in which sludge microorganisms adsorb the organic substances in the waste water to be treated and a part of them begin oxidation and decomposition of the substances in the first tank, the organic substances which are adsorbed by the sludge microorganisms are further decomposed by the microorganisms of the second tank, and the sludge microorganisms are activated in the third tank, is disclosed. The aeration amount to the respective tanks is controlled to fall within specified ratios. Further, the pH value in the aeration tank system is controlled to be slightly acidic, and the pH of the tanks increases in order from the first tank to the third tank. The process may also be carried out in a single tank using a three-step batchwise process, where the batches are subject to the aeration and pH requirements.

REFERENCES:
patent: 3725258 (1973-04-01), Spector et al.
patent: 3897334 (1975-07-01), Murphy
patent: 4280910 (1981-07-01), Baumann
patent: 4442005 (1984-04-01), Breider
patent: 4650585 (1987-03-01), Hong et al.

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