Activated sludge wastewater treatment process

Details Activated sludge wastewater treatment process Activated sludge wastewater treatment process

1988-06-30

1990-10-09

Hruskoci, Peter

Liquid purification or separation

Processes

Treatment by living organism

210626, 210903, 210906, 210220, 261122, C02F 320

Patent

active

049618547

ABSTRACT:
Wastewater and recycled activated sludge are homogeneously mixed in a first aeration zone by injecting an oxygen-containing gas such as air into the lower portion of the zone under conditions which produce a complete mix reaction and sufficient oxygen is supplied to meet the biological oxygen demands of the mixed liquor. The gas is introduced, preferably by a plurality of fine bubble membrane diffusers, in the form of fine bubbles having a diameter less than about 4 mm. The bubbles provide both the mixing to keep solids in suspension and the oxygen required to maintain the overall dissolved oxygen content in the first aeration zone as close to 0 as possible. The mixed liquor is sequentially contacted with an oxygen-containing gas in second and third aeration zones under conditions which produce a complete mix reaction, preferably by fine bubble membrane diffusers, clarified and a portion of the settled sludge is recycled to the first aeration zone.

REFERENCES:
patent: 3764523 (1973-10-01), Stankewich, Jr.
patent: 3939068 (1976-02-01), Wendt et al.
patent: 3953327 (1976-04-01), Parker
patent: 3964998 (1976-06-01), Barnard
patent: 3994802 (1976-11-01), Casey et al.
patent: 4011156 (1977-03-01), Dubach et al.
patent: 4056465 (1977-11-01), Spector
patent: 4162153 (1979-07-01), Spector
patent: 4269714 (1981-05-01), Ishikawa et al.
patent: 4479876 (1984-10-01), Fuchs
patent: 4563277 (1986-01-01), Tharp
patent: 4631134 (1986-12-01), Schussler
Process design Manual for Upgrading Existing Wastewater Treatment Plants, pp. 5-11 to 5-13, USEPA, 10/74.

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