C - Chemistry – Metallurgy – 02 – F
Patent
C - Chemistry, Metallurgy
02
F
362/4
C02F 3/30 (2006.01) C02F 3/12 (2006.01) G01N 33/18 (2006.01)
Patent
CA 1244562
ABSTRACT OF THE DISCLOSURE: 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 five 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 phosphates from the mixed liquor.
472426
Hamamoto Youichi
Hayakawa Noboru
Suzuki Tomio
Tabata Shin-Ichi
Watanabe Kaoru
Nishihara Environmental Sanitation Research Corporation Limited
Robic Robic & Associes/associates
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