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Skip Navigation LinksEvoqua Water Technologies > en > Brands > Envirex > OX™ Disc Aerators Replace Brush Rotors

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Mark Pamperin
Product Mgr., Biological Processes
844-290-2995

OX™ Disc Aerators Replace Brush Rotors

Reduce total lifecycle costs by more than 50%

We recommend replacing brush rotors with OX​ disc aerators, which reduce total lifecycle costs by more than 50 percent.  Because non-metallic OX disc aerators do not deteriorate or corrode like carbon steel brush rotors, the expected life of the system is at least 20 years.  In contrast, brush rotors typically last an average of only five to 10 years. 

Additionally, OX disc aerators:

  • Deliver additional aeration capacity to handle increased influent loading
  • Eliminate dead zones
  • Eliminate splashing that clogs mechnical components
  • Keep equipment cleaner to lengthen service life
  • Provide biological nutrient removal with existing tanks in series operation
  • Reduce energy costs by up to 40 percent in series operation
  • Offer stormflow management capabilities in series operation
  • Eliminate risk of flooding bearings during high-flow events


At Evoqua, we have more than 40 years of expertise in both brush rotors and disc aerators.  Evoqua is the OEM for Passavant Mammoth brush rotors.  We also pioneered the disc aerator in the 1970s.  So, we can replace your existing brush rotors or upgrade your ditches with OX disc aerators.  

To learn more about OX disc aerators, visit:

  • Case studies:
    • Tomball, Tx., WWTP – Replaced fine bubble air diffusers and reduced energy consumption by 40 percent while producing excellent effluent quality (total phosphorus 0.07 mg/L with chemical addition and total nitrogen 1.95 mg/L)
    • St. Charles, Mo., WWTP – Achieved more than 90 percent total nitrogen removal and more than 75 percent total phosphorus removal without tertiary filtration or added chemicals

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 Case Studies

  • Tomball, Tx., WWTP – Replaced fine bubble air diffusers and reduced energy consumption by 40 percent while producing excellent effluent quality (total phosphorus 0.07 mg/L with chemical addition and total nitrogen 1.95 mg/L)
  • St. Charles, Mo., WWTP – Achieved more than 90 percent total nitrogen removal and more than 75 percent total phosphorus removal without tertiary filtration or added chemicals

 Other Oxidation Ditch Solutions

  • Orbal® System Achieves exceptional nutrient removal performance as the most energy efficient, lowest maintenance and safest oxidation ditch available, serving plants with flows up to 15 MGD
  • Vertical Loop Reactor (VLR)® System Accommodates facilities with limited space and reduces oxidation ditch construction costs by using deep tanks (more than 20 ft.) to serve plants with an average flow between 1-40 MGD 
  • VertiCel® System Reduces oxidation ditch energy costs by about 30 percent by combining disc aerators and course bubble diffusers to serve plants with an average flow between 2-120 MGD
  • SmartBNR™ Process Control System Automates nutrient removal and stormflow response for all Evoqua oxidation ditch technologies (Orbal, VLR and VertiCel systems)
​Click on the tiles below to learn about other innovative technologies from Evoqua.
suzanne.alberti@evoqua.com OX™ Disc Aerators Replace Brush Rotors