Extended aeration wastewater treatment

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Water is a valuable resource. To ensure its proper conservation, it is mandatory to properly treat wastewater generated by human activity. Our extended aeration wastewater treatment is a factory-assembled, easy-to-install biological oxidation treatment designed to service small communities of up to 250 people-equivalent (PE). Solution applicable for flow rates up to 150 m3/day. 

Icon compact and discreet
Compact and discreet

Treatment and clarification in one tank 

Minimal visual impact 

Noise and odour free 

Icon versatile

Monoblock solution (50-250 PE) 

Domestic and commercial effluents 

Bespoke solutions icon
Bespoke solutions

Sized according to local requirements 

Factory-assembled components 

Applicable up to 150 m3/day 

360° support
360° support

Design experts 

Installation team 

Maintenance team 

What is an extended aeration wastewater system?

The compact Rewatec Extended Aeration System treats wastewater in a single tank, with two chambers. The first chamber is the biological reactor and the second chamber acts as the decanter.  

The Rewatec Extended Aeration technology removes pollutants through a continuous aeration and clarification process, returning the treated water to the environment in the best conditions and in accordance with local requirements.  

This solution is perfect for commercial projects and small communities servicing more than 50 people-equivalent (PE) striving for high performance with minimal energy consumption.

Examples of applications:

  • Small communities 
  • Commercial areas 
  • Apartment buildings 
  • Office buildings 
  • Schools 
  • Golf courses 

    How does Rewatec’s extended aeration technology work? 

    Rewatec’s extended aeration wastewater treatment solution is a simple, compact and easy to operate system. A single electrical panel controls the operation of the system’s electromechanical equipment and can be adjusted as required.  

    The system is designed to operate using the activated sludge treatment process. Wastewater seeps directly into the first chamber (reactor), where a system of membrane diffusers fed by side channel blowers injects fine air bubbles. The moving air supplies oxygen into the system to help the growth of bacteria and reduce the organic matter load. Once the effluent passes through the reactor, it enters the clarification chamber of the tank by gravity, where suspended solids sink to the bottom of the clarifier and clear water exits through an overflow at the top.  

    The bottom of the clarification chamber is equipped with a submerged pump that recirculates the settled sludge into the reactor to keep the level of activated sludge at optimum values at all times, thus maximising efficiency.  

    For communities above 50 PE it is always recommended to install a screen system prior to the reactor. 

    The blower and the electrical panel should be installed in a weatherproof enclosure to reduce maintenance and increase service life.


    Sketch of an extended aeration compact system for the treatment of wastewater


    Treatment performance

    Guaranteed performance : 

    Parameter Concentrations
    Inlet Outlet
    COD (mg O2/L) 800 < 125
    BOD5 (mg O2/L) 400 < 25
    TSS (mg/L) 500 < 35

    Maintenance of the system

    Premier Tech recommends that you follow the maintenance instructions according to the model installed. Protect your investment by having it regularly inspected to help extend the service life of the system and maintain your warranty. 

    If you need to check the state of your Rewatec Extended Aeration wastewater system, please feel free to contact us.  


    We stand by our products

    For over 25 years we have developed sustainable and long-lasting products that make a real difference for our clients, professional partners and, in particular, our planet.  

    Our experience in the industry allows us to offer you the most comprehensive warranty in the industry, in an open and honest manner.  

    The warranty of Rewatec’s Extended Aeration models includes*:

    • 5-year for polyethylene tanks manufactured by Premier Tech.
    • 2-year for the control panel and the pumps
    • 1-year for the blower
    • Proper operation and performance of the system if maintenance is carried out by our team.
    5 year warranty


    * Provided the equipment is properly installed, maintenance will be carried out in accordance with Premier Tech’s guidelines and by certified maintenance teams.  

    Catalogues and technical data sheets 

    Contact us

    Contact our team of experts to find out more about our sustainable solutions that help improve the environment and our planet. Together we will make a difference. 

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