Apparatus and process for biological wastewater treatment

• US 7,850,848 B2
• Filed: 03/31/2009
• Issued: 12/14/2010
• Est. Priority Date: 09/18/2006
• Status: Active Grant

• Current Assignee: Christopher A. Limcaco
• Original Assignee: Christopher A. Limcaco
• Inventors: Limcaco, Christopher A.
• Primary Examiner(s): PRINCE JR, FREDDIE GARY
• Application Number:
  US12/415,301
• Publication Number:
  US 20090230040A1
• Time in Patent Office: 623 Days
• Field of Search: 210/602, 210/252, 210/259, 210/150, 210/151, 210/170.01, 210/170.08, 210/198.1, 210/202, 210/221.1, 210/221.2, 210/631
• US Class Current: 210/602
• CPC Class Codes: C02F 1/32 with ultraviolet light
• CPC Class Codes: C02F 1/76 with halogens or compounds of halogens C02F1/4674 takes precedence
• CPC Class Codes: C02F 2209/40 Liquid flow rate
• CPC Class Codes: C02F 3/082 Rotating biological contactors
• CPC Class Codes: C02F 3/32 characterised by the animals or plants used, e.g. algae
• CPC Class Codes: C05F 17/40 Treatment of liquids or slurries
• CPC Class Codes: C10L 3/08 Production of synthetic natural gas
• CPC Class Codes: C10L 5/46 on sewage, house, or town refuse C10L5/403, C10L5/406 take precedence
• CPC Class Codes: Y02E 50/10 Biofuels, e.g. bio-diesel
• CPC Class Codes: Y02E 50/30 Fuel from waste, e.g. synthetic alcohol or diesel
• CPC Class Codes: Y02P 20/145 the feedstock being materials of biological origin
• CPC Class Codes: Y02W 10/10 Biological treatment of water, waste water, or sewage
• CPC Class Codes: Y02W 10/37 using solar energy
• CPC Class Codes: Y02W 30/40 Bio-organic fraction processing; Production of fertilisers from the organic fraction of waste or refuse

Abstract

A self-sustaining wastewater treatment facility abates greenhouse gas abatement, captures CO₂ and produces biomass to address multiple critical environmental needs. The facility includes an array of rotating media wheels that create an optimum ordered mixing of algae for sustained growth. Biomass harvested from the rotating media wheels may be provided to other processing facilities to produce, for instance, bio-fuels. Waste CO₂ from the processing facility may also be returned to the treatment system for enhanced algae growth. Bacteria are provided to form a symbiotic relationship with the algae, fueled by sunlight to effectively remove toxic materials from the wastewater. The multi-functional facility may also be integrated into a regenerative facility in which the biomass obtained from the algal and bacterial colonies is used in a separate facility and byproducts of the operation of the separate facility are used by the multi-functional facility to fuel further algal growth.

Claims

1. A wastewater treatment facility comprising:

an inlet flow path for receiving wastewater from a source;

a primary treatment system including;

a first tank for containing wastewater received through said inlet flow path;

a plurality of rotating media wheels mounted in said first tank for rotation within the wastewater and each containing a bacterial colony capable of digesting organic carbon in the wastewater and respiring CO₂, and each media wheel including surfaces for supporting algal growth, said surfaces arranged to be alternately immersed in the wastewater and exposed to sunlight;

an air supply disposed within said first tank and having a plurality of outlets directed at a corresponding one of said plurality of media wheels to rotate said wheels within the wastewater and operable to aerate the wastewater; and

a primary outlet for discharge of effluent treated by said primary treatment system after contact with the bacteria and algae;

a secondary treatment system including;

a second tank for receiving the effluent discharged from said primary outlet of said primary treatment system;

a plurality of media wheels, each configured substantially identical to said media wheels in said primary treatment system;

an air supply disposed within said second tank and configured substantially identical to said air supply of said primary treatment system; and

a secondary outlet for discharge of effluent treated by said secondary treatment system after contact with the bacteria and algae.

2. The wastewater treatment facility of claim 1, wherein said primary treatment system includes a primary clarifier disposed between said inlet flow path and said first tank, said primary clarifier operable to remove biosolids from the wastewater.

3. The wastewater treatment facility of claim 2, wherein said secondary treatment system includes a secondary clarifier disposed between said primary outlet and said second tank, said secondary clarifier operable to remove biosolids from the effluent from said primary treatment system.

4. The wastewater treatment facility of claim 3, wherein said secondary treatment system includes a tertiary clarifier at said second outlet to treat the effluent from said secondary treatment system, said tertiary clarifier operable to remove biosolids from the effluent from said secondary treatment system.

5. The wastewater treatment facility of claim 4, further comprising a disinfection unit downstream of said tertiary clarifier.

6. The wastewater treatment facility of claim 5, further comprising an aeration unit downstream of said disinfection unit.

7. The wastewater treatment facility of claim 4 further comprising a tank for receiving biomass extracted by said primary, secondary and tertiary clarifiers.

8. The wastewater treatment facility of claim 1, wherein each of said media wheels defines an interior portion communicating with the wastewater within a corresponding one of said tanks, said interior portion containing non-phototropic bacteria.

9. The wastewater treatment facility of claim 1, wherein said of said primary and secondary treatment systems includes a grid of interconnected panels defining a plurality of chambers within which a corresponding one of said media wheels is rotatably mounted.

10. The wastewater treatment facility of claim 9, wherein said grid defines a plurality of rows of chambers, adjacent chambers in each row in fluid communication to provide a plug flow pattern of wastewater through each row.

11. The wastewater treatment facility of claim 10, wherein each row of said grid defines nine chambers to rotatably receive a like number of said media wheels.

12. The wastewater treatment facility of claim 10, further comprising an air distribution grid associated with said grid of interconnected panels, said air distribution grid including a pipe associated with each of said rows, said pipe defining an air outlet opening at each of said chambers for directing air to rotate said media wheel associated with said chamber.

13. The wastewater treatment facility of claim 1, wherein said plurality of rotating media wheels in each of said primary and secondary treatment systems is provided in rows of nine media wheels.

14. The wastewater treatment facility of claim 1 wherein said primary and secondary treatment systems are housed within a greenhouse.

15. The wastewater treatment facility of claim 1, wherein said primary and secondary treatment systems are provided in a multi-level arrangement in which at least one tank of said systems is supported vertically above another tank of the systems.

16. The wastewater treatment facility of claim 15, wherein at least a lowermost one of said tanks is provided with a lighting system to provide light to said tank.

17. The wastewater treatment facility of claim 16, wherein said lighting system includes a collector for collecting sunlight, a light pipe for conveying the sunlight and an interior light fixture connected to said light pipe.