EMU: Rotox Jet Aerators system

Aeration in biological treatment systems For aeration and circulation in activating basins of the biological cleaning stage we use the aerators (Rotox system). An important prerequisite for a successful biological sewage treatment is a sufficient oxygen input. In addition to the high oxygen exploitation in the sewage a thorough circulation of the basin contents is achieved.Advantages:– universal use– later installation into existing plants without problems– uncomplicated handling– independent of basin shape and dimension– easy installation at low cost– adaptable, flexible system– intermittent operation is possible

EMU: Sludge treatment

Waste water treatment results in the necessity of treating the arising sludges. This means that the sludge is stabilized and thickened by various processes. WILO submersible mixers which can be adapted to the local conditions to reach optimal results, ensure the necessary circulation.To keep the sludges pumpable, WILO submersible mixers with special propeller designs are used to homogenize them.

EMU: Megaprop submersible mixers

Low Speed Submersible Mixers WILO Maxiprop and WILO MegapropIn sewage treatment plants they are used for the suspension of solids and/or for the selective flow generation.In activating, anaerobic and denitrification basins low speed mixers prevent settling of activated sludge flakes, i.e. they stir them up and keep them in suspension.The backwards bent blades ensure a selfcleaning effect of the propeller even when there are long-fibrous solids in the liquid. The forces are distributed to three propeller blades when the WILO Megaprop is used, which results in the realization of a very high thrust and smoother running. This means that for special kinds of use the number of mixers can be decreased.
Maxiprop and Megaprop submersible mixers are installed and removed by means of a lowering device which is fixed at the bridge and at the floor. If the conditions are suitable also a tripod unit can be used. The advantage of this installation version is that no bridge is required. There is the choice between the following materials: galvanized steel or stainless steel.

EMU: Uniprop submersible Mixers

The use of WILO-Uniprop submersible mixers with gearbox in industry, communities and agriculture makes great demands on their reliability and constancy of performance. It is possible to choose the optimal submersible mixer for every field of application through the modular assembly of different propellers, transmission steps and motors. Hydraulic optimal propellers made of stainless steel, steel, GFK (polyester resin reinforced by glass fibre) or PUR (polyurethane) enable a high efficiency and because of that vast savings of energy costs.Optimized adaption to requirementsIn order to improve their efficiency the Uniprop submersible mixers have been equipped with planetary gearboxes. They make an exact adaption to the individual service conditions possible.
WILO lowering devices are used for descending the WILO-Uniprop-submersible mixers from the tank edge into the tank without problems. Together with an auxiliary lifting device make WILO they enable individual positioning of the mixers. A ball pivot in the bottom bearing plate enables an installation to grounds inclined up to 30° and if the conditions are suitable, the application of a tripod unit is possible.There is the choice between the following materials: galvanized steel or stainless steel.

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.