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1. WO1997042126 - STATION DE RELEVAGE DES EAUX USEES

Note: Texte fondé sur des processus automatiques de reconnaissance optique de caractères. Seule la version PDF a une valeur juridique

[ EN ]

What is claimed is:
1. An underground sewage lift station comprising
(a) a solids separation chamber having a sewage inlet, and a grease discharge outlet;
(b) a grease separation chamber adapted to receive grease from said solids separation chamber;
(c) a sewage lift chamber;
(d) a water conduit adapted to convey water from the solids separation chamber to the grease separation chamber, said conduit having an inlet end communicating with said grease separation chamber, and an outlet end communicating with said sewage lift chamber;
(e) a grease transfer conveyor adapted to transfer grease from said grease separation chamber to a first, remote, higher destination, said grease transfer conveyor having an inlet end communicating with said grease separation chamber and an outlet end communicating with the first, remote, higher destination;
(f) a solids transfer conveyor adapted to transfer solids from said solids separation chamber to said sewage lift chamber; and
(g) a sewage lift conveyor adapted to transfer solids and water from said sewage lift chamber to a second, remote, higher destination.

2. The apparatus of claim 1, wherein said solids transfer conveyor comprises a pump within said solids separation chamber, and a conduit having an inlet end connected to said pump and an outlet end opening into said sewage lift chamber.

3. The apparatus of claim 1, wherein said sewage lift conveyor comprises a pump within said sewage lift chamber, and a conduit having an inlet end connected to said pump and an outlet end at a remote destination.

4. The apparatus of claim 1, wherein said solids separation chamber includes a baffle to concentrate solids in the vicinity of said pump.

5. The apparatus of claim 1, wherein said water conduit has an inlet end in the lower part of said grease separation chamber and an outlet end in the upper part of said sewage lift chamber.

6. The apparatus of claim 1, wherein said grease transfer conveyor includes a grease skimmer in the upper part of said grease separation chamber, a conduit
extending from said skimmer to said remote destination, and a pump for conveying grease from said skimmer, through said conduit to said remote destination.

7. A sewage lift station comprising
(a) a solids separation chamber having a rear wall, side walls, and a front wall having a height less than the height of said rear and side walls, said chamber having a sewage inlet in a wall other than said front wall;
(b) a grease separation chamber having a rear wall common with the front wall of said solids separation chamber, side walls, and a front wall;
(c) a sewage lift chamber having a rear wall common with the front wall of said grease separation chamber, side walls and a front wall;
(d) a water conduit having an inlet end in the lower part of said grease separation chamber, and an outlet end in the upper part of said sewage lift chamber;

(e) a grease transfer conveyor adapted to transfer grease from said grease separation chamber to a first, remote, higher destination, said grease transfer conveyor comprising a grease skimmer located in the upper part of said grease separation chamber, a conduit having in inlet end communicating with said skimmer and a discharge end at said first, remote, higher destination; and a pump adapted to convey grease from said skimmer, through said conduit to said first, remote, higher destination;
(f) a solids transfer conveyor adapted to transfer solids from said solids separation chamber to said sewage lift chamber, said solids transfer conveyor comprising a pump within said solids separation chamber, and a conduit having an inlet end connected to said pump and an outlet end opening into said sewage lift chamber; and
(g) a sewage lift conveyor adapted to transfer solids and water from said sewage lift chamber to a second, remote, higher destination, said sewage lift conveyor comprises a pump within said sewage lift chamber, and a conduit having an inlet end connected to said pump and an outlet end at the second, remote, higher destination.

8. The apparatus of claim 7, wherein said grease separation chamber includes a baffle extending across said chamber between said side walls, said baffle being positioned between the front wall of said solids
separation chamber and said skimmer.

9. The apparatus of claim 7, further including a solids retention screen extending between the walls of said solids separation chamber above said sewage inlet.

10. The apparatus of claim 7, wherein said water conduit extends through the front wall of said grease separation chamber at a given height, said front wall of said solids separation chamber extends above said given height, and said skimmer is at said given height is said grease separation chamber.

11. A method of operating a sewage lift station comprising
(a) conveying sewage comprised of grease, water and solids to a first chamber;
(b) conveying grease from said first chamber to a second chamber, and pumping solids and water from said first chamber to a third chamber;
(c) pumping grease from said second chamber to a first, remote, higher destination, and conveying water from said second chamber to said third chamber; and
(d) pumping water and solids from said third chamber to a second, remote, higher destination.

12. The method of claim 11, wherein said sewage is conveyed to the upper part of said first chamber.

13. The method of claim 11, wherein said solids are pumped from the bottom section of said first chamber.

14. The method of claim 11, wherein said grease is pumped from the upper part of said second chamber.

15. The method of claim 11, wherein said water is conveyed from the bottom part of said second chamber.

16. The method of claim 11, wherein said water and solids are pumped from the bottom part of said third chamber .

17. A method of operating a sewage lift station comprising
(a) conveying sewage comprised of grease, water and solids to a first chamber;

(b) conveying grease from said first chamber to an adjacent second chamber at a first given level, and pumping solids and water from said first chamber from below said first given level to a third chamber;
(c) conveying water form said second chamber to said third chamber at a second given level no higher than said first given level, and pumping grease from said second chamber at said second given level to a first, remote, higher destination; and
(d) pumping water and solids from said third chamber at below said second given level to a second, remote, higher destination.