Orbital wastewater treatment system with combined surface aerator and submerged impeller

1. An orbital wastewater treatment system comprising:

a tank;

a partition disposed in said tank to define a pair of channels in said tank, said tank having a turning wall bounding contiguous portions of said channels, said partition having an end spaced from said turning wall, whereby said channels communicate with one another;

a driven shaft disposed vertically in said tank between said end of said partition and said turning wall, said driven shaft being provided at an upper end with a surface aerator and at a lower end with at least one horizontal impeller; and

at least one baffle member disposed in said tank partially about a lower end of said shaft including said impeller.

2. The system defined in claim 1 wherein said baffle member is spaced from a floor surface of said tank.

3. The system defined in claim 2 wherein said baffle member is attached on one side to said partition.

4. The system defined in claim 3 wherein said baffle member extends about said impeller through an angle of between about 90 degrees and about 270 degrees.

5. The system defined in claim 4 wherein said baffle member extends through an angle of about 180 degrees.

6. The system defined in claim 1 wherein said baffle member is attached to a floor surface of said tank.

7. The system defined in claim 6 wherein said baffle member is a cylindrical section extending upwardly from said floor surface.

8. The system defined in claim 7 wherein said baffle member extends about said impeller through an angle of about 180 degrees and is disposed on a side of said impeller opposite said partition.

9. The system defined in claim 6 wherein said baffle member includes a cylindrical section extending upwardly from said floor surface, said baffle member defining an inlet opening communicating with an upstream one of said channels and an outlet opening communicating with a downstream one of said channels.

10. The system defined in claim 1 wherein said baffle member has an inwardly facing surface in the form of a cylindrical section.

11. The system defined in claim 10 wherein said inwardly facing surface extends through an angle of between about 90 degrees and about 270 degrees.

12. The system defined in claim 1 wherein said shaft is provided at said lower end with at least two horizontal impellers.

13. The system defined in claim 12 wherein said baffle member partially surrounds said two horizontal impellers.

14. The system defined in claim 1 wherein said at least one horizontal impeller has adjustable blades for varying power consumption of said shaft.

15. The system defined in claim 14 wherein said blades are disposable at an adjustable distance from said shaft.

16. The system defined in claim 1 wherein said baffle member is mounted to said partition.

17. The system defined in claim 1 wherein said baffle member is mounted to a floor surface of said tank and extends upwardly therefrom.

18. The system defined in claim 1 wherein said baffle member forms about said impeller a chamber having an inlet opening communicating with an upstream one of said channels and an outlet opening communicating with a downstream one of said channels.

19. The system defined in claim 1 wherein said baffle member is attached on one side to said partition and is spaced from a floor surface of said tank.

20. The system defined in claim 1 wherein said baffle member is a cylindrical section.

21. An orbital wastewater treatment system comprising:

a tank;

a partition disposed in said tank to define a pair of channels in said tank, said tank having a turning wall bounding contiguous portions of said channels, said partition having an end spaced from said turning wall, whereby said channels communicate with one another;

a driven shaft disposed vertically in said tank between said end of said partition and said turning wall, said driven shaft being provided at an upper end with a surface aerator and at a lower end with at least one horizontal impeller; and

at least one baffle member disposed in said tank partially about a lower end of said shaft including said impeller, said baffle member being attached on one side to said partition and spaced from a floor surface of said tank.

22. The system defined in claim 21 wherein said baffle member extends about said impeller through an angle of about 180 degrees.

23. An orbital wastewater treatment system comprising:

a tank;

a partition disposed in said tank to define a pair of channels in said tank, said tank having a turning wall bounding contiguous portions of said channels, said partition having an end spaced from said turning wall, whereby said channels communicate with one another;

a driven shaft disposed vertically in said tank between said end of said partition and said turning wall, said driven shaft being provided at an upper end with a surface aerator and at a lower end with at least one horizontal impeller; and

at least one baffle member disposed in said tank partially about a lower end of said shaft including said impeller, said baffle member taking the form of a cylindrical section attached to and extending upwardly a floor surface of said tank, said baffle member being disposed on a side of said impeller opposite said partition.

24. The system defined in claim 23 wherein said baffle member extends about said impeller through an angle of about 180 degrees.

25. A fluid moving assembly for an orbital wastewater treatment system including a tank and a partition disposed in said tank to define a pair of channels in said tank, said tank having a turning wall bounding contiguous portions of said channels, said partition having an end spaced from said turning wall, whereby said channels communicate with one another, comprising:

a driven shaft disposable vertically in said tank between said end of said partition and said turning wall;

a surface aerator provided at an upper end of said shaft;

at least one horizontal impeller provided at lower end of said shaft; and

at least one baffle member disposable in said tank partially about a lower end of said shaft including said impeller.