Wastewater treatment system

• US 7,718,057 B2
• Filed: 09/18/2008
• Issued: 05/18/2010
• Est. Priority Date: 10/05/2005
• Status: Expired due to Fees

• Current Assignee: Evoqua Water Technologies LLC
• Original Assignee: Siemen Water Technologies Corporation (Siemens AG)
• Inventors: Liu, Wenjun, Jordan, Edward J.
• Primary Examiner(s): Barry; Chester T
• Application Number:
  US12/233,195
• Publication Number:
  US 20090026120A1
• Time in Patent Office: 607 Days
• Field of Search: 210/196, 2105321-5322, 210/906, 210150-151, 210/220
• US Class Current: 210/196
• CPC Class Codes: C02F 2209/42 Liquid level
• CPC Class Codes: C02F 3/085 Fluidized beds
• CPC Class Codes: C02F 3/10 Packings; Fillings; Grids packing elements in general B01J19/30, B01J19/32
• CPC Class Codes: C02F 3/1273 Submerged membrane bioreactors
• CPC Class Codes: C02F 3/301 Aerobic and anaerobic treatment in the same reactor
• CPC Class Codes: Y02W 10/10 Biological treatment of water, waste water, or sewage
• CPC Class Codes: Y10S 210/906 Phosphorus containing

Abstract

This invention is directed to a wastewater treatment system having a fluidizable media carrying anoxic bacteria in a first treatment zone and a filter membrane positioned in a second treatment zone. A wastewater is contacted with the fluidizable media and further contacted with air and a filter membrane.

Claims

1. A wastewater treatment system comprising:

an anoxic compartment fluidly connected to an aerobic compartment;

a source of wastewater fluidly connected to a first inlet of the anoxic compartment;

a first fluidizable media comprising bacteria positioned in the anoxic compartment;

a membrane module comprising a filter membrane positioned in the aerobic compartment; and

an oxygen depleting compartment comprising;

an outlet directly fluidly connected to a second inlet of the anoxic compartment;

a first inlet directly fluidly connected to an outlet of the aerobic compartment; and

a second inlet directly fluidly connected to an outlet of the anoxic compartment.

2. The wastewater treatment system of claim 1, further comprising an equalization tank positioned upstream of the anoxic compartment.

3. The wastewater treatment system of claim 2, further comprising a pretreatment unit positioned upstream of the equalization tank.

4. The wastewater treatment system of claim 3, wherein the pretreatment unit is a trap.

5. The wastewater treatment system of claim 3, wherein the pretreatment unit is a phosphorous removal unit.

6. The wastewater treatment system of claim 1, wherein the membrane module is disposed at an angle in the second treatment zone.

7. The wastewater treatment system of claim 6, wherein the module is disposed horizontally in the second treatment zone.

8. The wastewater treatment system of claim 1, further comprising means for fluidizing the fluidizable media.

9. The wastewater treatment system of claim 8, wherein the means for fluidizing the fluidizable media comprises a manifold positioned in the anoxic compartment below the fluidizable media.

10. The wastewater treatment system of claim 8, further comprising means for maintaining the fluidizable media within the anoxic compartment.

11. The wastewater treatment system of claim 1, wherein the anoxic compartment further comprises a second fluidizable media in a region separate from the first fluidizable media, the second fluidizable media supporting a different organism than the first fluidizable media.

12. The wastewater treatment system of claim 11, wherein the second fluidizable media is different from the first fluidizable media.

13. The wastewater treatment system of claim 1, wherein the bacteria is anoxic bacteria.

14. The wastewater treatment system of claim 13, wherein the bacteria is denitrifying bacteria.

15. The wastewater treatment system of claim 1, further comprising an aeration system in the aerobic compartment.

16. The wastewater treatment system of claim 2, further comprising a level sensor positioned in the aerobic compartment;

and

a valve positioned in a filtrate exit line of the aerobic compartment, the valve responsive to a signal generated by the level sensor.