Liquid purification or separation – Processes – Treatment by living organism
Patent
1999-02-10
2000-09-26
Upton, Christopher
Liquid purification or separation
Processes
Treatment by living organism
210626, 210143, 2101953, C02F 312
Patent
active
061238465
ABSTRACT:
A part of effluent is taken out, saturated with oxygen in a dissolved oxygen-saturation tank 5, and transferred into a dissolved oxygen measurement tank 6. Also, a part of the activated sludge in an aeration tank 1 is extracted and transferred into the measurement tank 6 via a distribution tank 4, and the change of dissolved oxygen concentration in the measurement tank 6 is measured. Based on the result of measurement is determined an organic matter concentration in effluent, and an amount of activated sludge to be returned from a precipitation tank 2 to the aeration tank 1 is determined based on the organic matter concentration. Thus, the fluctuation of organic matter load in effluent can be monitored simply and the amount of activated sludge to be returned can be controlled to match the fluctuation. There are provided a method for enabling such an operation and an apparatus suitably used in the method.
REFERENCES:
patent: 3684702 (1972-08-01), Hartmann
patent: 4783750 (1988-11-01), Smith
patent: 5106511 (1992-04-01), Kodukula
patent: 5585001 (1996-12-01), Jang et al.
patent: 5702951 (1997-12-01), Bridger
NEC Corporation
Upton Christopher
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