Rota-Rake® Solids Thickener

The Graver Rota-Rake® Clarifier is a horizontal flow sedimentation and thickening unit for the efficient separation of suspended solids from liquids by gravity. Designed for maximum separation, positive slude removal and complete overload protection, the Rota-Rake consists of:
1. Round or square tank with conical bottom, constructed of concrete or steel.
2. Quiescent-flow feed arrangement and overflow effluent collection system.
3. Positive slude collection and discharge system including motor-driven scraper and conical central discharge sump in the bottom of the tank.

The Rota-Rake is available in a wide range of sizes and designs to fit the needs of every type of gravity separation application.

Advantages of the Rota-Rake® Thickener

  • Wide range of types, models, sizes and torque-loading capacities
  • Maximum clarification with quiescent-flow feed system, minimum turbulence
  • Positive sludge removal with mechanical scraper, thickening sump and automatic blow-off control
  • Submerged orifice plate or peripheral V-notch weir water collection system
  • Positive overload protection with Protecta-Trol and optional hydraulic lifter
  • Low initial cost, economical operation through low maintenance requirements, rugged long-life construction, simple design
  • Ice design available for outdoor operation in colder climates
  • Utilizes shop assembled, oil-bath lubricated drive package

Typical Applications

  • Utility wastewater
  • FGD purge streams
  • Cooling tower blowdown
  • Industrial wastewater
  • Lime softener sludge
  • Coagulation sludge

Types of Thickeners

Type MB

Bridge-supported design with center drive assembly with solid steel shaft to rotate the scraper arms.

Feed System – Water enters pipe to inlet well. The stream leaving the inlet pipe is split so that the two flows lose velocity by neutralizing each other for gentle introduction into the unit.

Collection Method – Submerged orifice plate collectors. V-notch overflow weir also available.

Type HC

Heavy-duty center-post design for large diameter units and other sizes when torque-loading is more than 20,000 ft.-lbs. Torque cage or tube is used as the transmission unit.

Feed System – Water enters bottom of center-post, rises to inlet well and flows out through ports in top of post, losing initial velocity.

Collection Method – Submerged orifice plate collectors. V-notch weir collectors also available.

Photo Gallery

Rota-Rake® Solids Thickener

The Graver Rota-Rake® Clarifier is a horizontal flow sedimentation and thickening unit for the efficient separation of suspended solids from liquids by gravity. Designed for maximum separation, positive slude removal and complete overload protection, the Rota-Rake consists of:
1. Round or square tank with conical bottom, constructed of concrete or steel.
2. Quiescent-flow feed arrangement and overflow effluent collection system.
3. Positive slude collection and discharge system including motor-driven scraper and conical central discharge sump in the bottom of the tank.

The Rota-Rake is available in a wide range of sizes and designs to fit the needs of every type of gravity separation application.

Advantages of the Rota-Rake® Thickener

  • Wide range of types, models, sizes and torque-loading capacities
  • Maximum clarification with quiescent-flow feed system, minimum turbulence
  • Positive sludge removal with mechanical scraper, thickening sump and automatic blow-off control
  • Submerged orifice plate or peripheral V-notch weir water collection system
  • Positive overload protection with Protecta-Trol and optional hydraulic lifter
  • Low initial cost, economical operation through low maintenance requirements, rugged long-life construction, simple design
  • Ice design available for outdoor operation in colder climates
  • Utilizes shop assembled, oil-bath lubricated drive package

Typical Applications

  • Utility wastewater
  • FGD purge streams
  • Cooling tower blowdown
  • Industrial wastewater
  • Lime softener sludge
  • Coagulation sludge

Types of Thickeners

Type MB

Bridge-supported design with center drive assembly with solid steel shaft to rotate the scraper arms.

Feed System – Water enters pipe to inlet well. The stream leaving the inlet pipe is split so that the two flows lose velocity by neutralizing each other for gentle introduction into the unit.

Collection Method – Submerged orifice plate collectors. V-notch overflow weir also available.

Type HC

Heavy-duty center-post design for large diameter units and other sizes when torque-loading is more than 20,000 ft.-lbs. Torque cage or tube is used as the transmission unit.

Feed System – Water enters bottom of center-post, rises to inlet well and flows out through ports in top of post, losing initial velocity.

Collection Method – Submerged orifice plate collectors. V-notch weir collectors also available.

Photo Gallery