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What is a Rotary Drum Filter (RDF)?

A rotary drum filter, also called a drum filter, simply consists of a container with a drum, motor, spray tube, drainage gutter and water level sensor. The drum has an iron filter panel that is only permissible for water and the drum is attached to the motor by means of an axle. The spray bar is located above the drum and is connected to a rinsing pump.

How does a Rotary Drum Filter (RDF) work?

The drum filter is a pre filter system, which means that this filter is the beginning of a complete filter system. The drum filter does the first job of cleaning the water by removing debris. Then the water will flow to a biological filter (for more information about biological filters click here). Water flows into the drum filter and then ends up in the drum chamber. Here the debris will remain on the inside of the filter panel as the water flows through the filter panel, exits the drum and then exits the filter. At a certain point there will be so much debris on the filter panel that there is no more room for the water to pass through. This will change the water level in the filter which is detected by the sensor. This will then activate the rinse pump and drum motor. The drum will start rotating while the spray bar will clean the panel of the drum. It is important to know that the drum should not rotate continuously, but only rotates when it needs to be cleaned. This makes the whole process very energy efficient.

What maintenance does a Rotary Drum Filter require?

Ideally rotating drum filters require no maintenance. However, it is important to check whether the drum does not rotate continuously, this is usually due to an incorrect height of the water level sensor. Besides that, we also sell drum filters with a built-in UV-C system, where we recommend changing the UV lamp every year because of its effectiveness (for more information about UV-C systems, click here).