Method of exhausting dissolved oxygen in a nitrogen removal wast

Details Method of exhausting dissolved oxygen in a nitrogen removal wast Method of exhausting dissolved oxygen in a nitrogen removal wast

1991-09-09

1992-11-03

Silverman, Stanley S.

Liquid purification or separation

Processes

Treatment by living organism

210621, 210630, 210903, C02F 330

Patent

active

051600439

ABSTRACT:
The present invention relates to a nitrogen removal wastewater treatment process and system that entails an anoxic treatment zone followed by an oxic treatment zone with internal recycle of mixed liquor from the oxic treatment zone to the preceding anoxic treatment zone. Prior to recycling the nitrified mixed liquor back into the anoxic zone, the mixed liquor is held within a dissolved oxygen exhauster tank for a selected period of time where the dissolved oxygen concentration of the nitrified mixed liquor is substantially reduced to preferably below 0.5 ppm.

REFERENCES:
patent: 3964998 (1976-06-01), Barnard
patent: 4183809 (1980-01-01), Klapwijk et al.
patent: 4183810 (1980-01-01), Baenens et al.
patent: 4315821 (1982-02-01), Climenhage
patent: 4415454 (1983-11-01), Fuchs
patent: 4917802 (1990-04-01), Fukaya et al.
patent: 4999111 (1991-03-01), Williamson

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