Wastewater treatment system
View Patent ↗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.
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.