Industrial Post Treatment Aeration


Many industries discharge their treated wastewater into public waterways. Permits are often in place specifying the minimum required dissolved oxygen levels that are allowed in discharge water. Mazzei offers two solutions to help you meet effluent regulation specifications.

Venturi Wastewater Aeration for Post-Treatment

The Mazzei venturi wastewater aeration process is ideal for introducing ambient air or concentrated oxygen into wastewater effluent basins or piping. Treated effluent is pumped from a wastewater effluent basin or directly from the wastewater effluent piping through Mazzei® venturi injector(s) which aspirates either ambient air or concentrated oxygen without the need for blowers and 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/nozzle manifolds which thoroughly mix the sidestream with the main wastewater effluent flow.


• Quiet Operation

• No Limits on Water Depth

• Simple and Flexible Installation

• Low Installation Costs

• No Moving Parts

• Low Maintenance Costs

Pipeline Flash Reactor™ for Post-Treatment

Mazzei’s Pipeline Flash Reactor (PFR) provides rapid oxygen transfer within a compact footprint. The system utilizes a small sidestream passed through a patented Mazzei venturi 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 wastewater effluent pipeline. The PFR eliminates the need for post-treatment cascading systems or diffuser basins required by other technologies, which is a big benefit where space is an issue. The PFR can also be utilized for the dissolution of oxygen gas in systems with high dissolved oxygen requirements. Pipeline Flash Reactors are custom designed to each client’s application and performance requirements.


• 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

Check out a few of our CASE STUDIES