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Secondary sewage treatment system
| Details |
Inventors: Stuth, William L.;
Assignee:
Primary Examiner: Silverman; Stanley
Assistant Examiner: Upton; Christopher
Attorney, Agent or Firm: Cross, Jr.; Harry M.
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. |
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DETAILED DESCRIPTION A primary object of the present invention is to provide a secondary sewage treatment system intended to operate in conjunction with a conventional septic system.
The system of this invention is designed to be interposed between the septic tank and drainfield to provide a satisfactory effluent to the drainfield.
In particular, the present system is specially designed for use in commercial treatment systems that must handle food preparation wastes; and in this environment the system provides an effluent comparable to that which would be produced from a conventional residential septic tank.
Generally speaking, the system of this invention biologically treats biodegradable wastes through aerobic microbial growth on media resulting in the biological oxidation of the waste products.
The preferred embodiment of this invention functions as an aeration tank, settling tank and aerobic digester in a single unit.
This invention uses buoyant media, as contrasted with fixed or packed media, and consequently does not incur flocculent build-up during operation or the consequent clogging typical of fixed or packed media treatment systems.
In the present invention, biological growth takes place in a mixing zone filled with a bouyant media.
The bouyant media has a high surface area to volume ratio, a low resistance to liquid flow and a surface condition receptive to aerobic microbial growth.
Waste flow from a septic tank enters the system into a turbulent zone above the mixing zone and begins a continuous cycle, flowing down through the mixing zone and then upward through draft tubes from which it is re-introduced to the turbulent zone.
The mixing zone is filled with the bouyant media and the waste flows gently down through the mixing zone in contact with the buoyant media surfaces.
The draft tubes are free of buoyant media or any other surfaces on which biomass can collect.
The waste liquor is drawn turbulently up through the draft tubes and spills out above the mixing zone into the turbulent zone The turbulent zone is likewise free of buoyant media or any other surfaces on which biomass can collect
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