Aire-O2 Tri-Oval® Oxidation Ditch System

oxidation ditch

The Aire-O2  Tri-Oval® Oxidation Ditch System, named for our Aire-O2 Triton® in an oxidation oval, provides superior wastewater treatment process control and design flexibility of the activated sludge process. We specialize in oxidation ditch retrofits,  providing you with the cost savings benefits of little construction, easy installation, low maintenance, and reliable wastewater treatment. The system’s dual-function Aire-O2 Triton aerators/mixers drive fine bubble aeration and mixing up to 33ft deep (10m) and allow for full Biological Nutrient Removal (BNR). The energy efficient Triton can also operate in as shallow as 4ft (1.2m). Rentals are available to keep your plant compliant in emergency situations or with fluctuating loads throughout the year. View our Rental page to learn more.

Ideal for Municipal or Industrial Applications

The Tri-Oval® Oxidation Ditch System is a subsurface complete mix, looped reactor system that is ideal for municipal and industrial wastewater treatment facilities.

Why choose the Tri-Oval® Oxidation Ditch System?

  • Simple, flexible operation with easy process control
  • Reduced power consumption with low cost of ownership
  • Minimal heat loss offers improved winter performance
  • Total reliability, quiet operation, and flexible design for restricted land requirements
  • Aire-O2 Triton® Rentals available!


  • Full biological nutrient removal (BOD, TSS, Nitrogen, Phosphorous)
  • No aerosols or splashing
  • Complete mixing throughout the water column, eliminating solids deposition
  • Additional equipment can be provided to create a system package including: controls, instrumentation, and RAS/WAS pumps

Ideal Solution for

  • Biological Nutrient Removal (BNR)
  • Variable and high strength loads
  • Reducing complexity and maintenance

Interested in learning more? Download the Tri-Oval Oxidation Ditch Product Sheet.