Fine screens to replace sand filters
The Huber RoDisc® Micro Screen has been designed for fine screening and polishing of many effluents, and can be used for ensuring compliance with meeting discharge consent standards or allowing water to be reused within the plant.
The screen comprises a series of discs fitted with woven mesh down to 10 micron apertures which are slowly rotated on a central shaft all supported from bearings above water level. The mesh is immersed in the effluent and the filtrate collected from the inside of the discs ensuring a complete barrier to the solids.
Polishing was typically undertaken by sand filters however the RoDisc® has the following advantages compared to Sand filters:
- Low head loss often gravity flow through the screen
- Less power as flow is not pumped and the screen rotates only when dirty. No blowers required for back washing.
- Lower washwater pumping power as PD cell signals washwater cycle only when screen is dirty
- Low profile hence planning permission for high structures is not required.
- fixed media filtration so the solids retention is controlled
- Open structure for cleaning biomass, maintenance and monitoring
- Simple mechanical design without grit and associated abrasion problems.
- Compact design maximising filtration area to footprint area.
- Can be designed for future works enlargement by adding discs
- All stainless steel structure
- lower carbon footprint
Other features comparable with sand filters
- COD/BOD/Phosphorous solids removal
- Filtrate can be recycled for screen washing with direct washing from a spray system which pivots out for maintenance.
- Self contained tank mounted, or pre assembled chassis mounted for installation in concrete tank is possible.
- Fully automatic operation
The RoDisc® has many applications including:
- Final polishing for discharge or reuse
- Algae removal from drinking water
- Membrane protection
- Treatment of water for recirculation or service water
- Phosphate reduction with preceding precipitation and flocculation
With over 50 installations and a pilot plant available please contact Huber if you feel your application can benefit from fine screening.
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