Dirty water pump

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Wastewater pumps are able to pump even heavily contaminated water (but also other fluid media) with a high solid content such as stones , rubble and the like. As a rule , they are not self-priming , but are designed as submersible pumps in which a paddle wheel conveys the fluid .

Special impeller shapes such as vortex impellers, single-channel impellers, multi-channel impellers, diagonal impellers, helical impellers and propeller impellers are used for this. Smaller pumps usually have a vortex impeller, as this is the least susceptible to failure and offers a large free passage for the solids. Pumps with vortex impellers, however, have poor efficiencies and do not achieve high delivery heads; therefore, other impeller shapes are usually chosen for larger machines.

Dirty water pumps are designed for the delivery rate - typical delivery rates of 5,000 to 15,000 liters per hour (around 3 to 5 liters per second) - and less for the pressure, the delivery head is often only a few meters. It is usually driven by an electric motor , but depending on the application, it can also be done by an internal combustion engine .

This type of pump is used, for example, in civil engineering for pumping out excavations , in flood protection and disaster relief , for irrigation in agriculture and horticulture, or in landscape architecture for filling artificial water systems. Smaller models are also used in the home, so that the water for the lawn sprinkler is not taken from the "expensive" drinking water , but from nearby rivers or ponds (here, however, water regulations must be observed).