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Dissolved Air Flotation System (DAF) Installation

This project aims to the improve the ability to meet consent compliance, by providing customized and optimized tertiary treatment. These systems would take the place of the non performing lamella clarifiers.

A DAF unit is a Dissolved Air flotation System for removing Algal Solids from Discharges. 

The installation of DAF units at the Waipawa and Waipukurau WWTPs aims to the improve the ability to meet consent compliance, by providing customized and optimized tertiary treatment. These systems would effectively take the place of the non performing lamella clarifiers. With the improved treatment quality post DAF units, it is expected that the sand filters and the UV treatment process will also see an improvement in their efficiency.

These improvements will see the discharge quality greatly improved and subsequently compliance with discharge consents become routinely achievable prior to the construction of the centralised WWTP planned as part of the overall Wastewater Strategy.

Project start date:TBC

DAF1 Example DAF unit similar to the one that will be installed at Waipawa


 Algae is coagulated into ‘clumps’ before being ‘floated’ to the surface using compressed air


 Clarified effluent after ‘float’ is then skimmed off


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