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Grit Separation |
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Innovative Grit Separation Systems.
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Subordinated Product Groups |
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For reasons of operating reliability of wastewater treatment plants it is necessary to separate the grit transported with the wastewater and other mineral materials (approx. 60 l / 1000 m³ of wastewater) from the digestible organic material.
Grit separation from wastewater can prevent operational troubles, such as grit sedimentation (in aeration tanks and digestors), increased wear (of pumps or stirrers) and clogging (of removal hoppers or pipelines).
In addition, wear reduction of mechanical equipment (e.g. a centrifuge, etc.) can be achieved. The aim is to separate as much as possible of the grit and inorganic material up to 0.20 mm grain diameter and at the same time separate the mineral and organic particles in the grit trap.
The grit separating systems used today are divided into longitudinal grit traps, circular grit traps and vortex grit traps, depending on their design and process layout. They separate the grit either by gravity (longitudinal grit traps) or centrifugal force (circular and vortex grit traps). For longitudinal grit removal scrapers or screw conveyors are frquently used. Solids removal in the further course of the process is effected by pump, grit classifier or integrated grit classifying screw.
Due to the significant organics content in the classified grit longitudinal grit traps are today additionally aerated to at least partly avoid settling of organic material in the grit trap and cause floating material (grease) to rise to the surface. According to Kalbskopf, aerated grit traps are generally laid out on the basis of the residence time of wastewater in the grit trap. However, even aerated grit traps are unable to ensure reliable separation of grit from organics. This can only be achieved by well performing grit washing plants.
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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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