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Debris catcher

Debris catcherFibres, threads and rags in the waste water tend to catch and build up on projections in sewage treatment and waste water purification plants (known as RWZI plants in the Netherlands). These contaminants clump together to form debris in and around the moving and stationary components at the RWZI plant (pumps, gate valves, aerators, sensors, etc.). This leads to high maintenance costs.


Ensuring appropriate design for the components used in RWZI plants is a significant part of the solution to this problem. These components are shaped and positioned in a way that reduces the level of debris retention. While this is an important basic principle, it has not proved adequate in reducing the problems and breakdowns caused by debris to a satisfactory level.


Another approach is to catch the debris to prevent it from causing further problems. We use the debris catcher for this. This device, which looks like a large rake with hooked teeth, hangs in the moving water at the RWZI plant.


Debris catcherThis rake catches the clumps of debris so effectively that most of the contaminants are removed from the water, leading to a dramatic reduction in the number of breakdowns and blockages. The rake is raised up out of the water at scheduled intervals and emptied using a tilting system.


This debris catcher was developed in collaboration with Wetterskip Fryslân, the Water Board in the Dutch province of Friesland, and is now performing successfully at several RWZI plants.


Photo above: debris catcher in action

Photo below: clean rake



updated: 07-Okt-2014

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