Offsite-manufactured modular water treatment plants can improve water quality and safety as well as deliver certainty and savings in time, costs, resources, logistics and emissions. This paper describes the collaborative design and delivery of a new 1·3 Ml/d Lochmaddy water treatment works for Scottish Water on the remote island of North Uist in the Outer Hebrides. By changing the treatment method to nanofiltration and using an offsite modular approach, the project team cut costs and programme by over a third. The 12 modules for the treatment building were designed, fabricated, assembled, tested and pre-commissioned in the factory before delivery to site, where they were installed in just 4 weeks.
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