Membrane treatment for public water supply has grown exponentially since 1990.The absolute barrier provided by membrane treatment and the capacity to deliver consistent quality with minimum operator attention justified their use initially in small treatment applications.In recent years microbiological standards have tightened following well-documented parasitic disease outbreaks.This development has favoured membrane systems and until recently cost has precluded membrane application in large plants.Veolia Water was awarded a BOOT project for the design,construction and 25 year operation of three water treatment plants ranging in size from 8.0ML/d to 126ML/d,reservoirs and reticulation in the Bendigo region of Victoria.The contract has very stringent water quality targets that have been adopted from the US and EU drinking water standards.To meet the contract requirements high technology processes utilising microfiltration and ozone and BAC filtration were adopted.Conventional CMF microfiltration was chosen for the two smaller plants with the new CMF-S immersed membrane technology selected for the 126ML/day Sandhurst water treatment plant.The Bendigo plant was the largest immersed membrane plant in the wodd for the potable water treatment at the time of commissioning.This paper describes the 126ML/d Bendigo water treatment plant at Bendigo,Australia.It also discusses water quality standards and the multi-barrier approach applied to achieve the required standards to minimise public health risk and maximise aesthetic quality of this water supply.
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