Vortex Grit Trap
The Tuke and Bell Vortex Grit Trap works on the retention, constant velocity and forced vortex principles.
A specially designed paddle rotates in the same direction as the sewage providing a constant velocity of flow. A spiralling flow is created by the paddles to keep organic material in suspension and also creates a vortex in the lower half of the chamber to draw grit particles down to the centre hopper ready for collection.
In order to clean and remove the grit, compressed air is passed through pipe work located within the centre of the tank. After cleaning, the grit is pumped by the air lift method and is discharged into a grit classifier system.
The Tuke & Bell Vortex Grit Trap incorporates the following features: –
- Heavy duty slewing ring carries vortex drive tube and paddles.
- All bearings and drives rated for 100,000 hour design life.
- Gear driven slewing ring running in deep oil lubrication bath.
- Simply decoupled drive facilitating easy drive removal.
- Cast iron construction.
- 25 year design life.
The Tuke and Bell range of Screw Classifiers are a complete, free-standing unit, ideal for effective separation of grit from organic and other matter. A weir allows the separated organics to return, whilst grit is conveyed via the screw to a discharge point for disposal.
A wash water pipe connection and spray-bar are included within the classifier body for cleaning of the grit.
The Tuke & Bell Screw Classifier incorporates the following features: –
- Freestanding tank construction simplifies location.
- Universal tank handing simplifies pipe work connection.
- Fully enclosed screw with lockable, removable inspection covers.
- Wash water spray bar for grit polishing.
- Designed to accept multiple feeds.
- Can be fitted with Hydro-cyclones for handling high pumped feed flows.
Typically, the Screw Classifier is used in conjunction with a Vortex Grit Trap and together carries out the complete grit extraction process whilst allowing greater flexibility of plant layout.