Scraper & Picket Fence Thickener Equipment

Circular Settling Tank Equipment

Tuke and Bell offer a complete range of rotary scrapers for primary and secondary settling tanks, for sewage works and water treatment plants. The range is manufactured to standard designs but can be specially adapted to suit individual requirements.

The Process

After the initial screenings and grit extraction of crude sewage, the effluent is settled to remove further solids as sludge – this is known as primary settlement.  After biological treatment the sewage is settled again to remove humus sludge – this is known as final settlement.

Settlement is typically carried out in concrete tanks with a scraper mechanism used to collect the sludge for easy removal.

Refurbishment and Replacement of Existing Equipment

Tuke & Bell can refurbish and/or replace any other settlement tank equipment manufacturer’s equipment into their respective existing tank.

Rotating Bridge Scrapers
The Tuke & Bell Rotating Bridge Scraper consists of an access bridge with an open-mesh walkway, mounted onto a central rotating bearing.  The bridge supports an arrangement of helical scraper blades or alternatively a trailing scraper chain that conveys settled sludge to a central hopper for removal.  Rotational drive is provided by a gearbox mounted on a peripheral end carriage.

Tuke & Bell can offer three common rotating bridge scrapers: –

  • A half bridge scraper terminates at the centre of the tank.
  • A three quarter bridge scraper extends half again beyond the centre point of the tank diameter.
  • A full bridge scraper spans the entire diameter of the tank with an end carriage at each end.

The bridge can be fitted with ancillary equipment such as automatic scum removal systems, side-wall scrapers, channel and weir-cleaning brushes in order to make the machine suitable for use in primary or secondary settling tanks.  Additional equipment such as stilling rings, EDI drums, Mc Kinney Baffles and Stamford Baffles can be accommodated.

The Tuke & Bell Rotating Bridge Scraper incorporates the following features: –

  • Robust structure designed to resist imparted sludge loads.
  • Heavy duty slewing ring and axle bearings carries entire bridge load – zero additional load on gearbox bearings.
  • All bearings and drives rated for 100,000 hour design life.
  • Direct mounted gearbox removes maintenance intensive chain drives.
  • Simply decoupled axles, bearings & drive facilitating easy removal.
  • Lubrication points for slewing ring easily accessible from walkway.
  • Scraper blades feature replaceable wear tips that can be inverted for addition life.

Tuke & Bell can also supply weir plates, scum boards and launder channels to suit all circular tanks.

Specialised designs can also be produced to client specification; past examples of these include sludge airlift scrapers, lifting scraper blades and removable cartridge scrapers.

 

Fixed Bridge Scrapers
The Tuke & Bell Fixed Bridge Scraper consists of an access bridge with an open-mesh walkway which spans across the diameter of the tank, mounted in a fixed position onto concrete structure or separate portal frames if a glass coated steel tank is to be used.  A centrally mounted drive unit supports a hanging arrangement of helical scraper blades that conveys settled sludge to a central hopper for removal.

Tuke & Bell can offer three common fixed bridge scrapers: –

  • A half bridge scraper terminates at the centre of the tank.
  • A three quarter bridge scraper extends half again beyond the centre point of the tank diameter.
  • A full bridge scraper spans the entire diameter of the tank.

The bridge can be fitted with ancillary equipment such as automatic scum removal systems, side-wall scrapers, channel and weir-cleaning brushes in order to make the machine suitable for use in primary or secondary settling tanks.  Additional equipment such as stilling rings, EDI drums, Mc Kinney Baffles and Stamford Baffles can be accommodated.

The Tuke & Bell Rotating Bridge Scraper incorporates the following features: –

  • Robust structure designed to resist imparted sludge loads.
  • Heavy duty slewing ring carries entire scraper load – zero additional load on gearbox bearings.
  • All bearings and drives rated for 100,000 hour design life.
  • Direct mounted gearbox removes maintenance intensive geared drives.
  • Simply decoupled drive facilitating easy drive removal.
  • Lubrication points for slewing ring easily accessible from walkway.
  • Scraper blades feature replaceable wear tips that can be inverted for addition life.

Tuke & Bell can also supply weir plates, scum boards and launder channels to suit all circular tanks.

 

Sludge Thickeners

The Tuke & Bell Sludge Thickener consist of an access bridge with an open-mesh walkway which spans across the diameter of the tank, mounted in a fixed position onto concrete structure or separate portal frames if a glass coated steel tank is to be used. A centrally mounted drive unit supports a full length torque tube with a lower steady bearing; a “Picket Fence” type stirrer is mounted onto the torque tube. An echelon formation of scraper blades is utilised to provide positive movement of the thickened sludge to the centre hopper of the tank.

The Tuke & Bell Sludge Thickener incorporates the following features: –

  • Robust structure designed to resist imparted sludge loads.
  • Heavy duty slewing ring and axle bearings carries entire bridge load – zero additional load on gearbox bearings.
  • All bearings and drives rated for 100,000 hour design life.
  • Direct mounted gearbox removes maintenance intensive geared drives.
  • Simply decoupled axles, bearings & drive facilitating easy removal.
  • Lubrication points for slewing ring easily accessible from walkway.
  • Scraper blades feature replaceable wear tips that can be inverted for addition life.

Tuke & Bell can also supply weir plates, scum boards and launder channels to suit all circular tanks.

appleton

Appleton Half-Bridge Cartridge Scraper – Scraper Blades and Diffuser Drum

seascale

Seascale Half-Bridge Cartridge Scraper – Scraper Bridge

pontyberem

Pontyberem STW – Full Bridge Scraper

brentwood

Brentwood STW – Rectangular Scraper

Dorking STW – 4.3 m Ø Picket Fence Thickener

Dorking STW – 4.3 m Ø Picket Fence Thickener