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Screen Filtration
Screen Filters can be built in almost any size and are commercially available for a wide range of flow rates. Screens are made either of a woven mesh, perforated plates or a wedge wire construction. A screen filter is a surface filter with only 1 retention point for solids. Dirty water passes through the filter vessel from the inside to the outside of the screen, the larger particles are physically prevented from passing & are retained on the screen.
SE Filtration units are available with polyster coated steel or stainless stell
- Installed in parellel position
- Supplied in 3" to 16" inlet/ outlet connections
- Low backwash water consumption
The effective filtration area of a screen filter can be quite high and the initial "clean" head loss is quite low. The PD however, can build up quickly, making an effective cleaning schedule essential. Screen filters can be cleaned manually or automatically, like all other types of filter. Manual cleaning usually involves removing the filter element and hosing or brushing it clean. Automatic cleaning is activated automatically as the particles, trapped on the inside surface of the fine screen create a differential pressure buildup.
Rotating Brush Cleaning
A brush rotates over the screen element dislodging the "filter cake" and a purge valve flushes the dirt out through a drain whilst the system is under pressure.
A rotating vacuum scanner lifts "filter cake" off the screen without actually making physical contact. The rotation and linear movement of the scanner allow it to reach every part of the screen in minimal time. This system can be very effective and does not damage the screen as a brush may do.