Device and a method for emptying a sewer well, a sewer well and a receiver of a sewer pumping station

A sewer pumping station device for emptying a sewer well that comprises a lower relatively heavy fraction and an upper relatively light fraction, the device comprising a lower suction nozzle with a lower suction opening for removing the lower fraction, said lower suction nozzle being connected to a pump via a lower discharge conduit of a lower discharge piping connected to the lower suction opening,

• wherein at a position remote from the lower suction nozzle the device comprises an upper suction nozzle for removing the upper fraction said upper suction nozzle being connected to an upper discharge conduit,
• wherein either the upper suction nozzle is connected by means of the upper discharge conduit to the lower discharge conduit of the lower discharge piping connected to the lower suction opening for simultaneously removing the lower fraction and the upper fraction by means of the pump, or or the upper discharge conduit comprises a discharge opening at the lower suction opening of the lower suction nozzle for simultaneously removing the lower fraction and the upper fraction through the lower discharge piping by means of the pump, and
• wherein the diameter of the upper discharge conduit is smaller than that of the lower discharge conduit, such that during said simultaneously removing an amount of the upper fraction will be smaller than an amount of the lower fraction because of pressure difference that occurs.