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Passavant Fine Bubble Aeration Roeflex & Bioflex

Economically aeration of activated sludge tanks in biological wastewater treatment plants – whilst ensuring maximum oxygen transfer efficiency and a high level of process flexibility.

Unique Selling Point

  • Successful long-term use in innumerable installations worldwide
  • Simple installation and low level of investment
  • High oxygen transfer – confirmed in numerous tests at accredited institutes
  • Optimum adjustment to tank form and operation depth
  • Best possible design - considering diffuser density, air flow and oxygen transfer - due to many years of experience


With the Passavant® Fine Bubble Aeration Aqseptence Group offers high quality diffuser which are employed in wastewater treatment plants throughout the world and have been continuously improved and developed by our company for more than 25 years.

When air is supplied, fine slits are opened in the elastic membrane and fine air bubbles are released into the water. When the air supply is swiched off, the slots close completely. The hydrostatic head presses the membrane firmly onto the support pipe, thereby the air inlet opening is sealed. This double sealing procedure prevents any liquid entry into system. In contrast to rigid porous diffusers e.g. ceramic, intermittent operation is possible and a high level of operational reliability and flexibility ensured.

In order to supply the appropriate diffuser for every treatment process, AS provides a variety of elastomer membranes which are created for the individual type of wastewater.


Aeration Technology

Aeration tanks and the respective aeration equipment are at the core of modern biological wastewater treatment plants. Modern wastewater technology calls for efficient aeration systems which ensure a high level of technical flexibility...


Locations and Contact


Aqseptence Group Carpi Srl, Limidi

Sales and Manufacturing Location
Via Pitagora 30
41010 Limidi Di Soliera, MO

Tel: +39 059 525720

Fax: +39 059 525443



Aqseptence Group SAS, Availles-en-Chatellerault

Sales and Manufacturing Location
Zone Industrielle
86530 Availles-en-Châtellerault

Tel: +33 5 4902 1600

Fax: +33 5 4902 1616



Aqseptence Group GmbH, Aarbergen

Sales and Manufacturing Location
Passavant-Geiger-Strasse 1
65326 Aarbergen

Tel: +49 6120 280

Fax: +49 6120 28 2182


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