Liquid purification or separation – Processes – Treatment by living organism
Patent
1990-02-08
1990-12-04
Wyse, Tom
Liquid purification or separation
Processes
Treatment by living organism
210628, 210629, 210926, C02F 320
Patent
active
049751972
ABSTRACT:
In an orbal wastewater treatment process including a plurality of concentric, annular basins or channels having surface aeration means, wastewater and recycled activated sludge are mixed in a first channel by a combination of the surface aeration means and introducing 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 of less than about 4 mm. The mixed liquor is sequentially oxidized in second and third channels by a combination of surface aeration means and introducing an oxygen-containing gas into the lower portions of the channels, preferably by fine bubble membrane diffusers.
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Smith George W.
Thiel Donald J.
Wittmann John W.
Envirex Inc.
Wyse Tom
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