PROJECT: Water Treatment Works (WTW) – Raithby

The existing Water Treatment Works (WTW) at Raithby had reached the end of its life and required a major refurbishment, including a new 15Ml/d iron and manganese removal system complete with disinfection and supply pumps for the production of potable water.

Key features of the new works included:

• Rapid gravity filters to be installed outside at high level to remove the need for an underground pump station.
• Structured wall HDPE contact tanks to reduce capital costs and embodied carbon.
• Standard products to maximise off-site build.
• A modular approach to design to aid fabrication and construction by repetitive processes and techniques.

The key processes underpinning the project were:

• The selected treatment process for the scheme was a conventional iron and manganese removal plant consisting of aeration, oxidation, filtration and disinfection with a high lift pumping station.
• All major items of plant were assessed to determine the use of alternative materials and potential carbon savings.
• A carbon tracker was used through the process to identify where savings were achieved for each major element of plant.