Wessex Water
Principle Consultant:
Wessex Water
Wimpey Engineering and Construction
Project Capital Cost:
£7 000 000


The project consisted of an extension and up-rating of the existing Durleigh Water Works from 20Ml/day to 30Ml/day. The original plant included micro-straining, dissolved air flotation, ozonation, pressure filtration and disinfection. Whitewater was retained by the Contractor to provide process design services.


Detailed process design and equipment specification.

The existing micro-strainers were replaced with preliminary ozonation for to effect initial oxidation of organics. The dissolved air flotation plant was refurbished and new air saturation equipment installed. The existing ozonation equipment was replaced with new plant to provide primary and secondary ozonation.

A new activated carbon adsorption plant was installed comprising eight 3.3m diameter vertical pressure contactors for pesticide removal and ozone destruction.

A new chemical house was constructed housing new chemical storage and dosing equipment for coagulation, pH control, disinfection and plumbosolvency control.

A new PLC based distributed control system was provided with links to the existing central telemetry system.

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