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HUBER Grit Treatment System RoSF 5 HWS |
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Treatment of grit from wastewater treatment plants, sewer systems and of refuse and oil grit by means of a Wash Drum / Grit Washer
- Loss on ignition of the grit/gravel fraction < 3%
- Coarse material separation size of 10 mm
- Reduced disposal costs
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Acceptance station with horizontal dosing screw
The supernatant from the sewer cleaning vehicles is discharged prior to any solids discharge. After discharge of the liquid phase the vehicles (tankers, road sweepers, and container trucks) empty the resultant solids into the intermediate storage tank. A specified residual amount of liquid is passed forward via the horizontal screw into the wash drum. A horizontal dosing screw installed within the tank removes the solids and doses them into a subsequent
Wash Drum.
Coarse material separation
While wash water is added to pre-wash and homogenise the raw material within the Wash Drum, the perforated plate of the Wash Drum retains all particles > 10 mm, which are dewatered and then discharged into a skip. Since only coarse material > 10 mm is separated, the volume of the resultant residues is vastly reduced with the complete mineral material being further treated. The resultant coarse material can then be further separated into a mineral and organic fraction by means of a coarse material washer.
Grit classifying and washing
The grit/gravel/organics/water mixture is collected within a sump under the ROTAMAT® Wash Drum and is then pumped into the COANDA Grit Washer. With the use of the COANDA effect the rotational flow is directed to the tank where a defined flow field is produced which creates optimum conditions for the separation of mineral components. Due to a defined introduction of upwardly directed service water the grit situated within the lower part of the COANDA Grit Washer is fluidised within the flow enabling the lighter organic particles to be separated from the dense grit particles. The mineral fraction cleaned from organic components (grit and gravel up to 10 mm grain size, < 3% loss on ignition) is then automatically discharged by the integral grit removal screw when it is then statically dewatered and discharged into a container. The material can thereafter be recycled or dumped on inert material
landfills.
Conditioning of circulation water
The complete effluent from the COANDA Grit Washing Plant is passed into a Rotary Drum Fine Screen which then separates all organic material > 2 mm and discharges the dewatered material into a skip and the resultant screened organic material can then normally be either composted or incinerated. The screened water can be used as wash and transport water for the ROTAMAT® Wash Drum. A pump situated after the Rotary Drum Fine Screen delivers the water to the spray nozzles within the Wash Drum. And any excess water is passed on to the wastewater treatment facility (STW or separate water conditioning facility). The circulation of the resultant water minimises water consumption and achieves excellent separation degrees of fine grit.
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HUBER - WHERE QUALITY AND SERVICE SPRING TO MIND
Huber Technology UK, Units C and D Brunel Park
Bumpers Farm, Chippenham Wiltshire SN14 6NQ
Phone +44 1249 765000, Fax +44 1249 449076, E-mail: rotamat@huber.co.uk |
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