Screening off large particles

  • Minimizing congestion and pollution to sewer or further treatment step
  • Flexible screening systems
  • Easy handling / Easy access


The main purpose of a screening system is to remove larger particles and solids which could block or damage downstream processes. Furthermore non dissolved parts are preferably removed in early stage to prevent unnecessary amplification of more challenging dissolved pollutants removal. The screening systems are typically fed from an influent pump pit and pump capacity may subsequently determine the filter intake flow.

Screens may yield their specific pollutant in a very concentrated, pure form. This may lead to the benefit of recovering valuable solid matter before it enters the effluent treatment (e.g. vegetable peels which can be sold as animal food) Most solutions will create retention time for screenings to drain which results in dryer screenings leading to less and dryer sludge. Sludge may be discharged into a container via a chute.

The mesh, ranging from 0,5 up to 3mm, is typically made of a triangular shaped wire which is very difficult to block. The maximum capacity of the filter depends on the pollution load and the mesh width. Additional cleaning can be executed by (high pressured) spraying devices with hot or cold water, screen vibration, scrapers/brushes or a backwashing system. Screen solutions may be put into effect for factory effluent, truckwash installations, social water, CIP-installations or yard water treatment.


Marel Water Treatment provides the following filter systems:

  • Filter system installed directly in the pipeline
    The main advantage of this system is that the effluent does not need to be pumped to the filtration unit first. The system consists of congestion-free wipe-off sieve plates and congestion-free coarse rake screens.
  • Filter system installed outside the pipeline
    The advantage of a filter system installed outside the sewer system is the freedom in selecting the location. It has a static filter plate or a rotating filter drum, which can be fed internally or externally.


Marel offers a range of service solutions to prevent failures, maximize performance or in case of unexpected breakdowns remote or onsite assistance.

Marel has offices in 30 countries across all regions, and a global network of highly skilled professionals that provide remote as well as onsite service support. We provide quality spare parts and customized service agreements for our customers to ensure optimal performance of Marel equipment.

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