Aeration membrane PUM 68

The PUM 68 aeration membrane is a polyurethane membrane with specific openings allowing for air release in the form of fine bubbles ensuring aeration of the required medium, usually mixed liquor at wastewater treatment plants.

If there is sufficient volume of blown air and optimal tank bottom coverage with aeration elements, the even bubble distribution results in the medium stirring and sludge is maintained in suspension.

Given the properties of the applied polyurethane, our membrane is highly flexible and resistant which ensures, along with the design and density of perforation, high resistance to the chemical and microbial composition of wastewater as well as automatic drainage and resistance to incrustation.

The membrane features a long service life. Very good oxygen utilisation is reflected in economic operation of aeration systems fitted with these membranes.


  • Wide aeration operating range
  • High oxygen input and oxygen transfer efficiency
  • Low pressure loss
  • High tear-resistant and abrasion-proof
  • Good resistance to oil, gasoline and chemicals common in municipal waste water
  • High resistence to microbe and incrustation
  • Long service life
Technical parameters
 pum 68 Technical parameters of membrane  PUM 68
 material  polyurethane

 outer diameter  68 mm
 recomended air flow rate 1,5 - 10,0  Nm3/h.m
 optimal air flow rate  5,0 Nm3/h.m
 pressure loss    4,0 - 6,5 kPa
 standard aeration efficiency 4,6 - 11,0 kg/kWh
 standard oxygen transfer efficiency 5,1 - 12,0 %/m
 recommended temerature range 10 - 35 °C

chart SOTR cz

SOTR - standard oxygen transfer rate in g O2 per hour converted to 1m membrane length (diffuser submerged in depth of 3.9 m).

SSOTE - specific standard oxygen transfer efficiency in % converted to diffuser submersion in 1m of depth. 

chart SOTR cz

 SAE - standard earation efficiency per 1 meter of membrane (theoretical conversion considering the total blower efficiency of 70 %).