Wastewater Post Treatment


To meet effluent regulations, municipal wastewater plants employ multiple treatment methods to increase dissolved oxygen prior to final discharge into receiving waters.

Mazzei Offers Two Solutions for Meeting Effluent Regulations…


No. Regional Hancock Cnty WWTP Post Aeration-01

The Mazzei venturi wastewater aeration Process is ideal for introducing ambient air or concentrated oxygen into effluent basins or piping. Treated effluent is pumped from a basin or directly from the effluent piping through Mazzei® venturi injector(s) which aspirates either ambient air or concentrated oxygen — no need for blowers or compressors. The resulting wastewater effluent and air/oxygen mixture is then discharged back into the wastewater effluent basin or piping through Mazzei MTM™ mixing nozzles and nozzle manifolds which thoroughly mix the sidestream with the main wastewater effluent flow.

Benefits of Venturi Wastewater Aeration:

  • Quiet Operation
  • No Limits on Water Depth
  • Simple and Flexible Installation
  • Low Installation Costs
  • No Moving Parts
  • Low Maintenance Costs



Mazzei’s Pipeline Flash Reactor (PFR) provides a technology for rapid oxygen transfer within a compact footprint. The system utilizes a small sidestream which passes through a patented Mazzei Venturi Injector to draw in ambient air or concentrated oxygen. The aerated sidestream is then delivered to the PFR where it aggressively mixes with the main flow, uniformly transferring the oxygen in the wastewater effluent pipeline eliminating the need for additional tanks or basins required by other technologies.

Where space is an issue in new or retrofit systems, such as in existing built-out urban areas, the PFR reduces the basin size requirements and 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 DO requirements.

Pipeline Flash Reactors are custom designed to each client’s application and performance requirements.

Benefits of the Pipleine Flash Reactor for Oxygen Transfer:

  • Small Footprint Design
  • Quiet Operation
  • Low Maintenance Costs
  • Limited Downtime (Blowers and Bubble Diffusion Basins Typically Experience Much Downtime)
  • Eliminates the Flooding Problems Associated with Cascade Systems

Read more about the Pipeline Flash Reactor

Check out a few of our CASE STUDIES

Mazzei Pipeline Flash Reactor at the Hagerstown Wastewater Treatment Plant