Secondary sewage treatment system

Details Secondary sewage treatment system Secondary sewage treatment system

C - Chemistry, Metallurgy

02

F

C02F 3/08 (2006.01) C02F 3/10 (2006.01) C02F 3/12 (2006.01) C02F 3/22 (2006.01) C02F 3/30 (2006.01)

Patent

CA 2131180

2131180 9416999 PCTABS00033 A secondary sewage treatment system is provided with vertically-aligned foam collecting, turbulent, mixing, settling, and sludge collecting zones. A buoyant media (312), such as hollow plastic spheres, are contained in a buoyant media cage (300) and occupy substantially all of the mixing zone. Air diffusers including elongated draft tubes (306) extend from the turbulent zone down through the mixing zone for introduction of air to aerate waste water liquor and to cause the aerated liquor to recirculate up into the turbulent zone, thereby creating a circulation of waste water liquor from the turbulent zone, down through the mixing zone and around the buoyant media, and up through the draft tubes to the turbulent zone.

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