Secondary sewage treatment system

Details Secondary sewage treatment system Secondary sewage treatment system

1990-07-23

1991-07-09

Silverman, Stanley

Liquid purification or separation

Processes

Treatment by living organism

210618, 210629, 210151, C02F 306

Patent

active

050303538

ABSTRACT:
A secondary sewage treatment system is provided with vertically-aligned foam collecting, turbulent, mixing, settling, and sludge collecting zones. A grating defines the boundary between the turbulent and mixing zones. Beneath the grating, a bouyant media, such as hollow plastic spheres, are contained and occupy substantially all of the mixing zone. Air diffusers including elongated draft tubes 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 bouyant media, and up through the draft tubes to the turbulent zone.

REFERENCES:
patent: Re27721 (1973-08-01), Klock
patent: 2553228 (1951-05-01), Yonner
patent: 3841999 (1974-10-01), Bennett et al.
patent: 4043912 (1977-08-01), Bascope et al.
patent: 4231863 (1980-11-01), Sutphin
patent: 4420397 (1983-12-01), Kaneko et al.
patent: 4599174 (1986-07-01), McDowell
patent: 4627917 (1986-12-01), Morper

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