In sewage treatment plants recirculation pumps support the elimination of the ammonia nitrogen which is part of the pretreated sewage. They are transporting the nitrogenous sewage repeatedly from the nitrification back to the denitrification.
Advantages
submersible and compact design
big ranges of performance
low installation and maintenance effort
retrofitting to existing plants is possible at any time
pumping of the activated sludge in a gentle way
saving of energy costs through optimized flow efficiency due to the propeller design
reduction of investment costs.
In addition to their application in sewage treatment plants recirculation pumps are used for generating flows for example in amusement parcs.