In order to be landfilled, the grit must be further treated before. Depending on the size of the sewage treatment plant and the amount of grit, grit classifiers or grit washers are used. The state of the art is now the grit washer.
HUBER Coanda Grit Classifier RoSF3 Grit separation and dewatering in one unit
- Efficient Grit Removal with Coanda Effect for optimal flow conditions
- Partly reduced organic content in grit
- Maximum corrosion and wear resistance
- Optimized for maximum performance
This advanced grit classifier is a reliable and efficient solution for sewage works, addressing common challenges and offering enhanced removal performance and durability.
Previously designed plants, based on past experience, have often faced issues such as grit carryover due to insufficient retention time caused by plant under-sizing. This results in problems like deposits in digesters and high wear rates of pumps. On the other hand, oversizing the plant can lead to classified grit with a high organic content, which increases disposal costs and leaves the grit overly wet due to inadequate dewatering.
The HUBER Coanda Grit Classifier RoSF3 incorporates a unique center Coanda inlet which radially distributes the grit for optimum settling. Leveraging the Coanda Effect, the flow into the tank is precisely controlled and can be mathematically simulated. When operating at optimal flow conditions, the grit separation efficiency reaches up to 95% for particles as small as 200 micron.
Redundant installation of two HUBER Coanda Grit Classifiers RoSF3
HUBER Coanda Grit Classifier RoSF3
A classifying screw transports the grit from the separation room into a skip.
Design and Function
The HUBER Coanda Grit Classifier RoSF3 takes into account the difference in density between grit and organic components, which helps reduce organic contamination and allows for more efficient static dewatering of the classified grit. Thanks to its high efficiency, the RoSF3 can be much smaller in size compared to conventional classifiers, offering significant space-saving benefits while maintaining excellent performance.
The grit/water mixture flows, either pumped or by gravity, into the vortex chamber, where a rotary motion is generated, enhancing the separation process by creating the ideal flow conditions for efficient grit classification.
The heart of the HUBER Coanda Grit Classifier RoSF3 is the innovative Coanda Tulip. As the organically laden water flows in from the top, it adheres to the tulip's wall and is guided to the horizontal flow below the water surface by the Coanda Effect. This process helps reduce radial and tangential flows, enhancing the separation process. The difference in density between organic and mineral materials is effectively utilized, allowing for more efficient grit separation and reducing the organic contamination in the classified grit.
The classifier screw transports the clean grit up an inclined plane, where it is dewatered under gravity before being discharged into a dumpster. When the plant operates under optimum conditions, the mineral residue can achieve a purity of over 90%, especially in systems with effective pre-screening and grit collection facilities. This high-efficiency process ensures minimal organic contamination and maximizes the quality of the classified grit for disposal or further processing.
The Benefits of the HUBER Coanda Grit Classifier RoSF3
- Exceptional grit separation up to 95% of grit with grain sizes of 200 micron
- Screw is supported supported at both ends to minimize wear and ensure long-lasting performance
- High corrosion resistance
- Encapsulated, odor-free plant
- Frost-proof option for outdoor installations in colder climates
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