Wastewater treatment system and method

  • US 8,372,274 B2
  • Filed: 01/12/2011
  • Issued: 02/12/2013
  • Est. Priority Date: 01/13/2010
  • Status: Active Grant
First Claim
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1. A wastewater treatment system, comprising:

  • a hollow, elongate, cylindrical body made from high-density polyethylene, the cylindrical body having reinforcement ribs formed by a helically wound steel band embedded in the high-density polyethylene and extending between opposite ends of the elongate cylindrical body;

    end members extending across and covering the opposite ends of the cylindrical body, the end members and the cylindrical body forming a watertight tank defining at least one chamber adapted for treatment of wastewater, the tank being oriented vertically;

    an inlet pipe extending into the tank adapted for admitting wastewater into the tank, the inlet pipe consisting of a single inlet pipe;

    an outlet pipe extending from the tank adapted for discharging treated wastewater from the tank, the outlet pipe consisting of a single outlet pipe;

    first and second partition walls dividing said tank into three chambers, including;

    an anoxic first chamber adapted for housing bacteria, said inlet pipe extending into the first chamber, wherein the bacteria is selected from the group consisting of anaerobic bacteria and facultative bacteria;

    a second chamber forming a bioreactor adapted for housing aerobic bacteria;

    a third chamber forming a clarifier, said outlet pipe extending from the third chamber;

    a first conduit extending between the first chamber and the second chamber for passing partially treated wastewater from the anoxic chamber to the bioreactor chamber; and

    a second conduit extending between the second chamber and the third chamber for passing partially treated wastewater from the bioreactor chamber to the clarifier chamber;

    a first effluent filter disposed in the anoxic first chamber for filtering undigested organic matter in the partially treated wastewater before passing the partially treated wastewater to the bioreactor chamber;

    a source of pressurized air;

    an air conduit extending from the source of pressurized air into the bioreactor chamber;

    an air diffuser connected to the air conduit, the diffuser being disposed in the bioreactor chamber and producing a stream of air bubbles;

    a fixed film assembly disposed in the bioreactor chamber for supporting growth of the aerobic bacteria;

    a return activated sludge pump disposed in the clarifier chamber for feedback of activated sludge from the clarifier chamber to the anoxic first chamber for further wastewater treatment; and

    siphon-ejection air lift assembly disposed in the clarifier chamber for feedback of surface scum from the clarifier chamber to the bioreactor chamber, the siphon-ejection assembly including a air lift pump and needle valve block for air flow rate adjustment.

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