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ExtremeDuty™ Sludge Mixer

Vigorous Mixing of Anaerobic Digester Contents

For over 50 years, WesTech has been supplying mechanical sludge mixers for wastewater treatment plants. The current sludge mixer has evolved over the years as a result of WesTech striving to meet and exceed our customers’ needs.

WesTech ExtremeDuty™ Sludge Mixers provide vigorous mixing of digester contents to prevent stratification and improve the anaerobic digestion process. They reliably speed gas production while reducing foaming and scum accumulation.

This rugged design was originally developed to reduce the high service costs of egg-shaped digester mixers. It has proven to be so reliable that the ExtremeDuty Sludge Mixer is now used in all WesTech digester mixing applications across more than 800 installations.

The stellar performance of the durable ExtremeDuty Sludge Mixer has been further improved by the addition of a sludge-lubricated lower diamond bearing that has no mechanical seals, removing a common source of failure and minimizing mixer service and downtime.

ExtremeDuty Drive Configuration Schematic Rendering

Benefits and Features

Features and Benefits

Features and Benefits

Lower Diamond Bearing

  • Sludge-lubricated lower diamond bearing has no mechanical seals, removing a common source of failure
  • Polycrystalline diamond (PCD) inserts form the bearing surface and are not damaged by grit, abrasives, or solids
  • Diamond bearings are also available as a retrofit solution for existing WesTech mixers

Upper Bearing

  • The upper bearing is oil lubricated and sealed to ensure complete protection

Ragless Reversible Impeller

  • Dynamically balanced three-blade cast iron impeller is self-cleaning
  • Forward and reverse pumping re-entrains foam and settled solids

Mixer Housing

  • Rigid design eliminates the need for stabilizers or centering devices

Impeller Shaft

  • Designed to avoid natural frequencies that cause vibration and minimize deflection
  • Precise machine tolerances assure a quiet and smooth running system

Seal Tube

  • Designed to create a liquid seal so the mixer can be removed without releasing pressure or draining the digester

Design Flexibility

  • Internally mounted on the digester cover
  • Externally mounted with supports on the ground and two holes through the tank

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