Method for Operating a Wastewater-Lifting System

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.

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.