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The Errol Aero-Fac® WwTP operated at incredibly low costs for 22 years, then was inexpensively expanded for another 20 years. The Water Magazine article explains how the Scottish Water WwTP ended up totally recaptuing all front-end costs as compared to the proposed activated sludge option, resulting in a net-zero-cost 40+ year life for a wastewater treatment plant.

news errol water mag article dec23

The Aero-Fac® treatment system incorporates a number of highly unique features, not least of which is the self digesting sludge process that requires no pre-screening, sedimentation tanks or clarifiers, no sludge removal, dewatering or conditioning, and best of all, no routine sludge disposal and the associated lorry traffic in and out of the works. All sludge is continuously self-digested within the initial treatment stage.


Back in the late 1990s when Tayside Water (later merged into North of Scotland Water and eventually Scottish Water) first enquired about the possible use of Aero-Fac® for the local town of Errol, there was little discussion of carbon footprint, CSO/storm overflows and climate change challenges. Don McClean and his team at Tayside were interested in the technology essentially for its simplicity, low energy and lesser need for manpower, maintenance and its projected sustainability and total life-time cost.

NoSWA began work with Montgomery-Watson Projects (now Stantec) to evaluate the new-to-the-UK Aero-Fac® technology — a significant departure from the previously favoured options — to determine the benefits as opposed to traditional activated sludge options. 22+ years later, the numerous benefits and cost savings identified back in 1999-2000 have been more than realised for Scottish Water.

Learn more about the Aero-Fac® Wastewater Treatment Systems on our website.





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Excellence & Awards

  • Net Zero Carbon Initiative Finalist
    Stantec & Yorkshire Water Finalists in 2023 Water Industry Awards for the Withernsea Aero-Fac® WwTP

  • ICE Award
    The Withernsea Aero-Fac® WwTP has won the 2023 Institution of Civil Engineering's Edmund Hambly Medal (Design for sustainable development).

  • Green 100
    Gurney Environmental has been named a Green 100 company for Norfolk and Suffolk, England.

  • Certificate of Accreditation
    Gurney Environmental has been awarded a certificate of accreditation within the Contractors Health and Safety Assessment Scheme (CHAS) having demonstrated compliance with and sound management of current basic health and safety legislation.

  • Business Award
    Gurney Environmental were awarded a finalists place in Eastern Daily News Business Awards 17, a UK regional newspaper's business awards event.

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