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Low-cost water treatment process implemented at filtration plant in Victoria

An innovative low-cost water treatment process has been implemented at Rosslynne Water Filtration Plant (WFP) in Gisborne, Victoria.

GHD has helped Western Water remove disinfection by-products from the source water at the WFP’s 35 ML/d capacity reservoir.

This will result in greater utilisation of the local water supply and less importing of expensive water from Melbourne.

Michael Chapman, GHD’s Project Director, says, “This is an excellent example of how innovative thinking can help water utilities reduce costs and create additional value from their existing assets.

"This solution builds on GHD’s work with Western Water towards an integrated sustainable water supply strategy.”

The innovation was to dose Powdered Activated Carbon (PAC) at concentrations tailored to achieve the required removal of variable Dissolved Organic Carbon (DOC) levels in Rosslynne source water.

The PAC particles loaded with DOC are removed by the existing Dissolved Air Flotation process at the WFP.

Running from May 2012 to January 2014, the project involved bench and full scale pilot testing, followed by full scale construction at the existing Rosslynne WFP.

In addition, works to optimise the removal of manganese and to fluoridate the treated water were implemented.

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