Liquid purification or separation – Processes – Treatment by living organism
Patent
1985-01-18
1987-04-07
Wyse, Tom
Liquid purification or separation
Processes
Treatment by living organism
210628, 210903, 210906, C02F 330
Patent
active
046559256
ABSTRACT:
A method of removing nitrogen and phosphorus from waste water by using an activated sludge including aerobic bacteria is disclosed. The waste water is fed continuously and gradually into a treatment basin in which the sludge is contained so that a mixed liquor consisting of the waste water and the sludge is formed therein. A cycle consisting of an agitating step and an aerating step is repeated at least two times and each cycle is finished within two hours, with the ratio of the agitating time to the aerating time being between one to one and to one. In the agitating step, the mixed liquor presents an anoxic condition and a succeeding anaerobic condition. Denitrification occurs in the anoxic condition and the aerobic bacteria release phosphorus in the anaerobic condition. During the aerating step, nitrification is caused while the bacteria excessively ingest phosphorus from the mixed liquor.
REFERENCES:
patent: 4271026 (1981-06-01), Chen et al.
patent: 4488967 (1984-12-01), Block et al.
patent: 4522722 (1985-06-01), Nicholas
Barnard "A Review of Biological Phosphorus Removal in the Activated Sludge rocess" (Water SA, vol. 2, No. 3, Jul. 1975).
Barnard, "Biological Nutrient Removal Without the Addition of Chemicals" (Water Research, vol. 9, 1975).
Bishop et al., "Single-Stage Nitrification-Denitrification" (Journal WPCF, vol. 48, No. 3, Mar. 1976).
Hamamoto Youichi
Hayakawa Noboru
Suzuki Tomio
Tabata Shin-ichi
Watanabe Kaoru
Meller Michael N.
Nishihara Environmental Sanitation Research Corporation Limited
Wyse Tom
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