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Sewage pumps with macerators

The efficient disposal of sewage in detached and semi-detached houses, large building complexes, or in industrial and municipal applications is an increasing challenge due to reduced water consumption and increasing solid content. Sewage pumps with macerators, which include faeces pumps with macerators, wastewater pumps with macerators and submersible pumps with macerators, are designed to effectively shred problematic solids – such as wet wipes, rags, cleaning cloths and sanitary items – and prevent clogging. The right sewage pump offers a powerful solution and at the same time an energy-efficient solution to reduce costs as well as maintenance and repair effort.

Sewage pumps with macerators from Wilo

Thanks to their high delivery head, Wilo’s grinder pumps cover all building types – from detached and semi-detached houses and commercial buildings to industrial and municipal applications.

Sewage pump with macerator for detached and semi-detached houses

The Wilo-Rexa MINI3-S is a non-clog sewage pump with macerator for detached and semi-detached houses that drains reliably. It is connected to an existing socket and does not require any additional electrical installations.

Wilo-Rexa MINI3-S
Pumpstation Einfamilienhaus mit Wilo-Rexa MINI3-S
Pumpstation Mehrfamilienhaus mit Wilo-Rexa FIT-S

Sewage pump with macerator for multi-residential buildings, office complexes, commercial properties

The Wilo-Rexa FIT-S is an efficient sewage pump with macerator for multi-residential buildings and office complexes, providing fault-free pressure drainage and minimised overall costs in commercial properties.

Wilo-Rexa FIT-S

Sewage pump with macerator for municipal and industrial applications

The Wilo-Rexa PRO-S is a powerful sewage pump with macerator for municipal and industrial applications, which is ATEX-certified and designed for cost-effective continuous operation with high efficiencies. The system enables efficient pressure drainage for installations with high static delivery heads.

Wilo-Rexa PRO-S
Pumpstation mit Wilo-Rexa PRO-S

FAQ – frequently asked questions about sewage pumps with macerators

What do you have to consider for sewage pumps with macerators?

Sewage pumps with macerators, also known as faeces pumps or wastewater pumps with macerators, are specially designed for pressure drainage. These submersible pumps with cutting devices easily break up solids contained in the sewage and allow sewage to be pumped even in smaller pipes. The grinder pumps are floodable submersible pumps and meet the requirements of IP68. However, they can become clogged if certain environmental conditions in the pump chamber are not observed. Wastewater pumps without a macerator are unsuitable for sewage pumping because they do not meet legal and hydraulic requirements.

When do you need a sewage pump with macerator?

Pressure drainage poses a special challenge to sewage pumping. Wherever conventional sewers cannot be installed or the effort is simply too expensive, pressure drainage is used.

Small pipes with a diameter of DN 32 or DN 40 are used in pressure drainage. Due to these small pipe diameters, the sewage cannot be conveyed as usual. The contents would clog the pipe and the sewage pump.

Sewage pumps with macerators are used for this purpose. These faeces pumps can easily break down organic solids and therefore enable sewage to be conveyed in smaller pipes. This makes sewage pumps with macerators, also called grinder pumps, ideal for use in pressure drainage.

How does a sewage pump with macerator work?

Grinder pumps from Wilo are submersible pumps which are completely submerged in the pumped fluid. The inlet opening is located on the underside of the pump. Some submersible pumps have a small strainer connected upstream at the inlet. This screen retains larger particles and protects these submersible pumps from clogging.

Sewage pumps with macerators have a freely accessible inlet. Here, a macerator is mounted at the inlet. This macerator consists of a fixed blade and a rotating blade. The quick rotation of the rotating blade allows all contents in the pumped fluid to be finely shred. Whether that be large lumps of clay, denim or nylon fabrics, cleaning rags or faeces – everything is shredded and can be pumped through small pipes without any issues.

What is the delivery rate of a sewage pump with macerator?

Depending on the model, a grinder pump can manage up to 19,000 l/h. This corresponds to approx. 316 litres per minute. This delivery rate is sufficient to pump even large sewage shafts empty in a short time.

Can the sewage pump with macerator be left in the pump chamber?

The sewage pumps with macerators from Wilo are designed as submersible pumps that can be flooded. The pumps meet the requirements of IP68 and can therefore remain in the pump chamber.

However, the environmental conditions in a pump chamber are not exactly optimal. Therefore, the following points must be observed:

  • The less sewage there is in the chamber, the faster the remaining sewage can dry up. Dried-in sewage becomes encrusted and can lead to malfunction of the pump and the installed sensor technology.
  • The pump chamber should therefore be filled and pumped out regularly. This keeps the sewage moving and prevents it from becoming encrusted.
  • The chamber can be regularly pumped out using an external sensor system or via the attached float switch on the grinder pump.
  • Float switch, level sensor or dynamic pressure bell ensure that the grinder pump switches on at maximum water level and switches off at minimum water level.
  • In addition, such level control devices prevent the grinder pump from running dry and protect the motor from overheating.

Isn’t a normal wastewater pump sufficient?

It is often wrongly claimed that a wastewater pump can also be used for pumping sewage. However, this is not the case. Wastewater pumps usually have a strainer mounted on the inlet opening. This protects the pump from clogging, but prevents content from being pumped out. So the chamber cannot be emptied properly in the long run. Furthermore, the hydraulic design of wastewater pumps is not suitable for pumping sewage with all its contents. The pumps would clog in a short time.

In addition, there are legal aspects that prescribe certain parameters for sewage transport. In Europe, for example, sewage pumps without a macerator must have at least a DN 50 discharge connection and a free ball passage of 50 mm. For pressure drainage, sewage pumps with a discharge connection of at least 32 mm and an upstream macerator are mandatory.

Summary: Wastewater pumps are suitable for pumping water from excavation sites, garden ponds, or rivers or lakes. However, not for pumping sewage.

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