Pipeline Flash Reactor in municipal water and wastewater applications

Pipeline Flash Reactors™ (PFRs or spool pieces) utilize high velocity mixing to transfer ozone or oxygen-enriched sidestreams into bulk water flow, all within a compact footprint. With a PFR, ozone or oxygen mass transfer occurs within seconds and eliminates the need for additional tanks or basins. Whether it is providing ozone for water purification or increased dissolved oxygen for wastewater, Mazzei’s PFR uniformly distributes gas into the water and minimizes the size and cost of gas contacting.

The Best Performance for Ozone Transfer


The Pipeline Flash Reactor is based on the opposing nozzle patent and supported by years of research at leading universities. It delivers superior ozone transfer performance with proven mass transfer efficiency rates exceeding 95% with little measurable pressure loss across the mixing zone.


  • Rapidly mixes ozone gas with treatment plant’s bulk water
  • Low pressure loss across the mixing zone
  • Mass transfer efficiency of 95% and greater
  • Reduces size requirements of downstream contact basins
  • Eliminates repairs/replacement of diffuser stones
  • Can increase basin CT credits
  • Completely fabricated in 316L stainless steel
  • Designed specifically to conform to plant space, flow requirements, and ozone dosage

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Read research paper about the Pipeline Flash Reactor.

Independent analysis of the first full scale Pipeline Flash Reactor™ revealed an ozone mass transfer rate of 98% (Neeman et al., AWWA 2002 Water Technology Conference). Subsequent systems have been measured at a mass transfer efficiency of 97% and higher.

Pipeline Flash Reactor™ eliminates the need for post-treatment basins or cascade systems.

Municipal wastewater plants typically have to employ some method of treatment to increase dissolved oxygen prior to final discharge into receiving waters. Mazzei’s Pipeline Flash Reactor provides a new technology for rapid oxygen transfer within a compact footprint. The system utilizes a small sidestream passed through a patented Mazzei Injector to draw in ambient air or concentrated oxygen. The aerated sidestream is then delivered to the Pipeline Flash Reactor where it aggressively mixes with the main flow, uniformly transferring the oxygen in the effluent pipeline.

Where space is an issue, such as in existing built-out urban areas, the PFR eliminates the need for post-treatment cascading systems or diffuser basins required by other technologies. The PFR can also be utilized for the dissolution of oxygen gas in systems with high dissolved oxygen requirements.

The Pipeline Flash Reactor eliminates noise and high maintenance costs and downtime associated with blowers and bubble diffusion basins as well as the problems that cascade systems have with flooding.

Read More about the PFR for Wastewater Applications.