Method for Operating a Wastewater-Lifting System

Patent metadata

Field	Value
Publication number	US-2021246646-A1
Application number	US-201917053457-A
Country	US
Kind code	A1
Filing date	May 7, 2019
Priority date	May 9, 2018
Publication date	Aug 12, 2021
Grant date	—

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

1 - 14 . (canceled)

15 . A method for operating a wastewater-lifting system in which wastewater laden with bulky materials is guided through a bulky material-collecting tank having at least one separating screen arranged in its interior, comprising the steps of:
during intake of wastewater, retaining the bulky materials 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 a pump and a bypass line connected to the connecting line between the bulky material-collecting tank and the pump, wherein the connecting line contains a pivoting flap which, during the intake of wastewater, closes a portion 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, closes the bypass line and opens the portion of the connecting line between the pump and the bypass line to permit the pump to pass pre-cleaned wastewater from the liquid-collecting tank through the connecting line to the bulky material-collecting tank.

16 . The method as claimed in claim 15 , wherein
a flow rate of the wastewater laden with bulky materials flow and a flow rate of pre-cleaned wastewater generated by pump flow during the pumping process are substantially equal.

17 . The method as claimed in claim 16 , wherein
a difference the between flow rate of the wastewater laden with bulky materials flow and the flow rate of pre-cleaned wastewater generated by pump flow during the pumping process is less than 40%.

18 . The method as claimed in claim 16 , wherein
a difference the between flow rate of the wastewater laden with bulky materials flow and the flow rate of pre-cleaned wastewater generated by pump flow during the pumping process is less than 20%.

19 . The method as claimed in claim 15 , 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.

20 . The method as claimed in claims 17 , wherein
during the intake of 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.

21 . The method as claimed in claim 18 , wherein
the angle is 10° to 30° relative to a plane perpendicular to the direction of flow through the connecting line to the pump.

22 . The method as claimed in claim 19 , wherein
at least one stop limits the angle to not be perpendicular to the direction of flow through the connecting line to the pump.

23 . The method as claimed in claim 15 , wherein
when the pivoting flap is closed toward the pump except for allowing the flushing flow around the pivoting flap during the intake of wastewater, the flushing cross section is at least in part formed by a bulged portion of the connecting line adjacent to the pivoting flap.

24 . The method as claimed in claim 19 , wherein
the pivoting flap is arranged in an interior of the flap connector.

25 . The method as claimed in claim 15 , wherein
the 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.

26 . A wastewater-lifting system, comprising:
a bulky material-collecting tank to receive wastewater laden with bulky materials and having at least one separating screen arranged in its interior configured to retain bulky material and allow flow of pre-cleaned wastewater separated from the bulky material out of the bulky material-collecting tank; pump 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 in the connecting line, wherein the wastewater-lifting system is configured such that during intake of wastewater, the wastewater pre-cleaned 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, and during a pumping process, the pre-cleaned wastewater being withdrawn from the liquid-collecting tank by the pump, opens the connecting line in a direction from the pump to the bulky material-collecting tank and closes the bypass line.

27 . The wastewater-lifting system as claimed in claim 26 , 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.

28 . The wastewater-lifting system as claimed in claim 26 , wherein
the pivoting flap is arranged in an interior of the flap connector.

29 . The wastewater-lifting system as claimed in claim 26 , wherein
when the pivoting flap is closed toward the pump except for allowing the flushing flow around the pivoting flap during the intake of wastewater, the flushing cross section is at least in part formed by a bulged portion of the connecting line adjacent to the pivoting flap.

30 . The wastewater-lifting system as claimed in claim 26 , wherein
the 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

• 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

• 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

• F04D15/029

  for pumps operating in parallel · CPC title

• E03C1/1227

  of pumps for facilitating drawing off · CPC title