EMU: Recirculation Pump

From this product line our recirculation pumps were developed. Today they achieve an important contribution to compliance with the ever stricter degradation quality requirements placed upon both communal and industrial sewage works. Recirculation pumps support the selective reduction in pre-treated sewage of the included ammonia nitrogen.A further application is the production of well controlled horizontal flows for water rides in amusement parks.ApplicationRecirculation pumps are suitable for pumping big volume flows at low flow velocities in a gentle and energy-saving manner.
Normally there are low heads and the required flow rates can be adapted to the requirements imposed by the process, for example by variable frequency drives.Possible applications:– Sewage treatment: activation, nitrification, denitrification, oxidation ditches, phosphate elimination– Amusement parks: flow channels– Ponds: flow generation, irrigationSewage treatment plantsToday in biological treatment of municipal sewage treatment plants basically nitrogen elimination takes place.Elimination of the ammonia nitrogen which is part of the pretreated sewage is effected in two steps. In the first step the ammonia nitrogen is oxidized to nitrate (nitrification).In the second step, a partial reduction of the nitrate to molecular nitrogen follows (denitrification).

For the biological treatment of nitrogenous sewage it is necessary that the sewage runs several times through the biological treatment. Only in this way the purification values prescribed by law can be reached.In these continuous processes at big pumping capacities mostly only low heads have to be passed. This task is fulfilled by recirculation pumps. Amusement parksOne of the most popular attractions in any amusement or adventure park are the flume rides with their long slow rise and rapid descent. In a log flume the car is drawn mechanically up the ascent, and will then descend unaided under its own and its passengers weight. This necessitates the presence in the canal of a lubricating film of water. For the necessary lubrication of the descent water must be pumped in a separate canal to the top of the ride.This continuous water cycle is created by recirculation pumps. These pumps are specially designed for pumping big quantities of water to low heights.