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TWISTER® Low-Speed Aerator

Long-lasting performance, and the highest oxygen-transfer rates of any mechanical aeration system on the market

The TWISTER® low-speed aerator is designed for long-term, continuous operation. Twister optimizes the spray of water droplets, resulting in some of the highest oxygen-transfer rates of any mechanical aeration system. And it offers long-lasting performance.

The Twister low-speed aerator's high oxygen transfer makes it ideal for a wide range of high-oxygen-demand biological treatment applications, from activated sludge to oxidation ditches and extended aeration operations, in municipal, petrochemical, pulp and paper, and other industries.

The Twister low-speed aerator, available with coated-frame and nonmetallic float options, can be configured as a floating unit using a three-pod, stainless-steel float and support infrastructure, or as a fixed unit using an adjustable mounting plate for optimal operational performance.

With thousands of installations around the world, Fluence has designed the Twister low-speed aerator to be a reliable, well-tested technology for your wastewater treatment needs.

How the Twister Aerator Works

All Twister low-speed aerators consist of a motor mounted to a gear reducer and a specially designed rotor attached to the bottom of an extended shaft. When activated, the Twister turns at a slow speed (typically 40 to 100 rpm) while the rotor fins pump large amounts of water into the air in a fine spray. These very small droplets create a 360-degree circular pattern.

Twister creates a high transfer of oxygen with its large surface-to-volume water droplet ratio and long exposure to air after spraying. Pumping up oxygen-deficient water from the bottom of a basin and exposing it to the air above the water's surface provides faster mass transfer from ambient air to the water droplet.

The Twister low-speed aerator's deep pumping action generates effective localized mixing to optimize many wastewater treatment processes, including those that require fast and efficient oxygen transfer, for instance, the pulp and paper, food processing, and other industries.

Twister Aerator Features

Designed for long-term, continuous operation, the Twister aerator uses an innovative composite material in the construction of its hydrodynamically efficient rotor. Fluence has molded the rotor to optimize the spray of water droplets, resulting in some of the highest oxygen-transfer rates of any mechanical aeration system.

Using the latest in power transmission technology, the Twister aerator converts the least amount of energy into the maximum amount of rotor torque for excellent aeration and deep basin mixing. Models are available from 2 to 150 horsepower (1.5 to 112 kW) at 50 or 60 Hz.

The Twister aerator's features include:

  • Flange coupling for high-torque, lifetime performance
  • Standard motor for easy availability and replacement
  • Float- or fixed-mount units to meet process requirements
  • Minimum 2.0 gearbox safety factor to assure long life
Extensive Applications

The Twister has been used in:

  • Wastewater treatment
  • Supplemental aeration
  • Leachate treatment
  • Sequencing batch reactors
  • Municipal wastewater treatment
  • Pulp and paper mills
  • Chemical processing
  • Wine and beverage manufacture
  • Agriculture waste
  • Oxidation ditches

A Proven Solution for Long-Term, Low-Speed Aeration

Lease units are readily available as a quick backup for unforeseen conditions, if your capital budget is limited, or if you would like to evaluate a unit in your particular application. Whatever the reason, if you decide to buy your leased equipment, you'll get a generous credit for your lease payments.

At Fluence, our applications engineers are devoted exclusively to helping treatment plant operators, consulting engineers, and contractors worldwide. With decades of expertise, and best-in-class technologies, our experts can help you find the right aeration solution for your unique challenges.

Contact Fluence for more information about Twister low-speed aerators, ready-to-lease units, or to receive a quote.


Contact Fluence to learn more about our wastewater treatment solutions, or to discuss your specific project details.


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