Lake Cochran PFAS Water Treatment

Water Treatment Hazardous Waste PFAS Treatment Remediation Waste Management Occupational Hygiene Sludge Dewatering Environmental

Engaged by the Department of Defence for RAAF Base Williamtown, Synergy is providing water treatment services for the Lake Cochran outflow, targeting per- and poly- fluorinated alkyl substances (PFAS). Lake Cochran is a man-made lake, which is recharged by both groundwater and surface water runoff that is impacted by PFAS.

Synergy’s bespoke WTP has been operational on the Lake Cochran project since December 2016, and has successfully treated a cumulative volume of 160 million litres of PFAS impacted water, to August 2017.

The WTP is achieving significant removal of PFAS contaminants down to less than 0.02μg/L after treatment, using a 3-stage multi-barrier process at variable flow rates, ranging from 15 L/s, up to 70 L/s.

The contractual agreement focuses on four potential contaminants of concern: perfluorooctanesulfonic acid (PFOS), perfluorooctanoic acid (PFOA), perfluorohexanesulfonic acid (PFHxS), and 6:2 Fluorotelomer sulfonic acid (6:2 FTS). However, the WTP is demonstrating the reduction of all the other PFAS contaminants of concern to be below NSW EPA, Department of Health and Department of Defence, approved criteria.

Additionally, the process technology can minimise waste streams substantially, by comparison to conventional techniques, to less than 0.1% the volume of water treated, thereby being sustainable and cost effective, from an operational and maintenance perspective to the client.

For detailed project information refer to the Defence website at:

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