Method for operating a wastewater-lifting system

Patent metadata

Field	Value
Publication number	US-12442174-B2
Application number	US-201917053457-A
Country	US
Kind code	B2
Filing date	May 7, 2019
Priority date	May 9, 2018
Publication date	Oct 14, 2025
Grant date	Oct 14, 2025

Abstract

A wastewater-lifting system and a method for operating a wastewater-lifting system guides wastewater loaded with bulky materials into a bulky material collection tank having at least one separating screen. During intake of wastewater, the bulky materials are retained in the bulky material collection tank and pre-cleaned wastewater passes into a liquid collection tank via a connection line and one or both of a pump and a bypass line connected to the connection line. During the wastewater intake a pivoting flap in the connection line closes flow to the pump except for a flushing cross section, and opens the bypass line. During a pumping operation, the pivoting flap opens the connection line from the pump and closes the bypass line.

First claim

The invention claimed is:

1. A method for operating a wastewater-lifting system in which wastewater laden with bulky materials, which are materials in the wastewater that are retained by at least one separating screen, is lifted and guided by a pump through a bulky material-collecting tank having the at least one separating screen arranged in the interior of the bulky material-collecting tank, comprising the steps of:
during intake of the wastewater, retaining the bulky materials in the bulky material-collecting tank and feeding pre-cleaned wastewater from which the bulky materials have been removed via a connecting line to a liquid-collecting tank via one or both of the pump and a bypass line connected to the connecting line between the bulky material-collecting tank and the pump,
wherein opposite ends of the connecting line and an end of the bypass line define a flap connector comprising a three-way bolted t-junction within which a pivoting flap is disposed,
during the intake of the wastewater, closing a portion of the connecting line between the bypass line and the pump except for a flushing cross section configured to allow flushing flow around the pivoting flap toward the pump, and opens the bypass line to permit the pre-cleaned wastewater to flow to the liquid-collecting tank, and
during a pumping process, closing the bypass line and opening the portion of the connecting line between the pump and the bypass line to permit the pump to pass the pre-cleaned wastewater from the liquid-collecting tank through the connecting line to the bulky material-collecting tank, wherein
the flushing cross section is at least in part formed by a bulged portion that is defined by an outward curvature in a wall of the connecting line adjacent to the pivoting flap, the outward curvature being located adjacent to a free end of the pivoting flap, and
the flushing cross section is established as an annular space or annular cross section, such that in a closed state of the pivoting flap, the pivoting flap is spaced apart from an inner wall of the flap connector.

2. The method as claimed in claim 1 , wherein
a flow rate of the wastewater laden with the bulky materials and a flow rate of the pre-cleaned wastewater generated by pump flow during the pumping process are substantially equal.

3. The method as claimed in claim 2 , wherein
a difference between the flow rate of the wastewater laden with the bulky materials and the flow rate of the pre-cleaned wastewater generated by the pump flow during the pumping process is less than 40%.

4. The method as claimed in claim 2 , wherein
a difference between the flow rate of the wastewater laden with the bulky materials and the flow rate of the pre-cleaned wastewater generated by the pump flow during the pumping process is less than 20%.

5. The method as claimed in claim 1 , wherein
the pivoting flap is connected to a flange of the bypass line, a flange of the connecting line, or to a flange of the flap connector arranged in the connecting line via a foot-side joint.

6. The method as claimed in claim 3 , wherein
during the intake of the wastewater the pivoting flap is inclined in the connecting line at an angle which is not perpendicular to a direction of flow through the connecting line toward the pump.

7. The method as claimed in claim 6 , wherein
the angle is 10° to 30° relative to a plane perpendicular to the direction of flow through the connecting line to the pump.

8. The method as claimed in claim 6 , wherein
at least one stop limits the angle to not be perpendicular to the direction of flow through the connecting line to the pump.

9. The method as claimed in claim 1 , wherein
when the pivoting flap is closed toward the pump except for allowing the flushing flow around the pivoting flap during the intake of the wastewater.

10. The method as claimed in claim 5 , wherein
the pivoting flap is arranged in an interior of the flap connector.

11. The method as claimed in claim 1 , further comprising: a pressure line, wherein pre-cleaned wastewater entrains solids retained in the bulky material-collecting tank and transfers the wastewater via the pressure line to a further system for further treatment.

12. The method as claimed in claim 1 , further comprising: an inflow distributor, and a feed line, wherein an inflow 1 of the wastewater flows via the inflow distributor and the feed line, and transfers the wastewater into the bulky material-collecting tank out of two bulky material-collecting tanks.

13. A wastewater-lifting system, comprising:
a bulky material-collecting tank to receive wastewater laden with bulky materials, which are materials in the wastewater that are retained by at least one separating screen, and having the at least one separating screen arranged in the interior of the bulky material-collecting tank configured to retain the bulky material and allow flow of pre-cleaned wastewater separated from the bulky material out of the bulky material-collecting tank;
a pump for lifting the waste water, connected on one side to the bulky material-collecting tank via a connecting line and on an opposite side to a liquid-collecting tank;
a bypass line arranged between the connecting line and the liquid-collecting tank, the bypass line connecting to the connecting line between the bulky material-collecting tank and the pump; and
a pivoting flap that is disposed within a flap connector comprising a three-way bolted t-junction defined by opposite ends of the connecting line and an end of the bypass line,
wherein the wastewater-lifting system is configured such that
during intake of the wastewater, the pre-cleaned wastewater from the bulky material-collecting tank passes into the liquid-collecting tank via one or both of the pump and the bypass line, and the pivoting flap closes the connecting line at a location between the bypass line and the pump in a direction of the pump except for a flushing cross section configured to allow flushing flow around the pivoting flap toward the pump and opens the bypass line,
during a pumping process, the pre-cleaned wastewater being withdrawn from the liquid-collecting tank by the pump, opening the connecting line in a direction from the pump to the bulky material-collecting tank and closes the bypass line, wherein
the flushing cross section is at least in part formed by a bulged portion that is defined by an outward curvature in a wall of the connecting line adjacent to the pivoting flap, the outward curvature being located adjacent to a free end of the pivoting flap, and
the flushing cross section is established as an annular space or annular cross section, such that in a closed state of the pivoting flap, the pivoting flap is spaced apart from an inner wall of the flap connector.

14. The wastewater-lifting system as claimed in claim 13 , wherein
the pivoting flap is connected to a flange of the bypass line, a flange of the connecting line, or to a flange of a flap connector arranged in the connecting line via a foot-side joint.

15. The wastewater-lifting system as claimed in claim 13 , wherein
the pivoting flap is arranged in an interior of a flap connector.

16. The wastewater-lifting system as claimed in claim 13 , wherein
when the pivoting flap is closed toward the pump except for allowing the flushing flow around the pivoting flap during the intake of the wastewater.

17. The wastewater-lifting system as claimed in claim 13 , wherein
a flap connector is arranged in a 3-way connector in the connecting line, and the bypass line is connected to the 3-way connector via a branch.

Assignees

• Ksb Se & Co Kgaa

Inventors

• Becker Michael
• Geinitz Juergen
• Pensler Thomas

Classifications

• F04D15/029

  for pumps operating in parallel · CPC title

• E03F5/14

  Devices for separating liquid or solid substances from sewage, e.g. sand or sludge traps, rakes or grates (for use in sewage purification plants or both in sewage purification plants or in sewer systems B01D, C02F {; gullies with sediment traps E03F5/04}) · CPC title

• E03F5/10

  Collecting-tanks; Equalising-tanks for regulating the run-off; Laying-up basins · CPC title

• E03C1/1227

  of pumps for facilitating drawing off · CPC title

• E03F5/22 Primary

  Adaptations of pumping plants for lifting sewage (wheeled apparatus for emptying sewers or cesspools E03F7/10; pumps, pumping plants, per se F04) · CPC title