Melbourne WTP

Melbourne Water’s Western Treatment Plant (WTP) has recently been upgraded to include a new 140 ML/d process train.

The upgrade was carried out by CPB-UGL JV and employs an advanced biological nitrogen removal process to minimise oxygen consumption and energy demand.

As part of the drive to reduce energy usage Hydroflux was awarded the supply of the membrane diffuser package which included over 1700 x Q4 AEROSTRIP Diffusers within four tanks.

AEROSTRIP Diffusers use a unique polyurethane membrane that produce a 1mm bubble size, which maximises oxygen mass transfer and leads to reductions in air demand had other conventional type diffusers been used. Typical energy savings range from 30–45 per cent against tube and disc type diffusers.

The unique proprietary polyurethane blend has no plasticisers or fillers which is typical in EPDM diffusers which become brittle within a few years of being put into service. Plus the elastic strength of the AEROSTRIP membrane is far greater than silicon.

Installations across Australia dating back from 2008 prove the long-term benefit of AEROSTRIP Diffusers in terms of longevity and performance. This matches the European and US experience where AEROSTRIP are achieving a life greater than 12 years.

The WTP in Melbourne is the second largest AEROSTRIP installation in Australia, with Woodman Point WWTP being the largest at 180 ML/d.

This partner content is brought to you by Hydroflux. For more information on AEROSTRIP Diffusers, visit

Charlotte Pordage is Editor of Utility magazine, a position she has held since November 2018. She joined the team as an Associate Editor in October 2017, after sharpening her writing and editing skills across a range of print and digital publications. Charlotte graduated from Royal Holloway, University of London, in 2011 with joint honours in English and Latin. When she's not putting together Australia's only dedicated utility magazine, she can usually be found riding her horse or curled up with a good book.

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