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Anne-Marie Trevelyan, MP for Berwick-upon-Tweed, has visited Northumbrian Water’s new Aero-Fac® WwTP at Waren Mill, just outside Bamburgh. Accompanied by local councillor Guy Renner-Thompson, Anne-Marie met Northumbrian Water Group (NWG) CEO Heidi Mottram, plus NWG Director of Corporate Affairs Louise Hunter, and David Richardson who manages the site.

In 2019, Northumbrian Water completed the construction at Waren Mill of an extraordinarily flexible, low carbon footprint, dramatically low Total Life Cost Aero-Fac® wastewater treatment system supplied by Gurney Environmental. The Waren Mill scheme is NWG’s first facultative lagoon to treat wastewater, and one of several similar facilities in the UK. The MP’s press release stated, "The eco-friendly way of treating wastewater is low on power costs and needs little maintenance, making it a preferred option where there is space to install large lagoons.

"The surrounding area has a high transient tourist population, and the addition of the Budle Bay campsite some years ago meant the existing treatment centre was undersized and required an upgrade. The twin-lagoon system provides a long-term solution to the changes in capacity required throughout the year."

Ms Trevelyan was given a tour of the site so that she could see the WwTP for herself. She was also shown the new pumping station near the centre of the village which helps sewerage reach the WwTP.

She said: “I am delighted to see the final result of this project for myself, and I congratulate Northumbrian Water Group on their fantastic facility which will serve local residents and visitors for decades to come.”

Extraordinary Flow Variation Capability

Process engineers at Gurney Environmental developed this specific Aero-Fac® wastewater system for Northumbrian Water to meet a normal winter population of 200, but rising to a summer population of almost 3,000! This dramatic variation in flow from winter to summer can create serious issues for many WwTP designs. At this particular location, Northumbrian Water had been tankering away excess wastewater flows over the 150-pe SAF design with an associated high operating cost and carbon footprint.

In the analysis by Northumbrian Water’s consultants, Aero-Fac® offered a well-proven and time-tested system with the flexibility and robustness of operation to be able to cost-effectively and easily accommodate this large flow variation.

In the past year, especially with the covid pandemic, the nearby caravan site was full, so the WwTP had a high load summer. However, with the new Aero-Fac® system, Northumbrian Water have finally had a year with no tankering!

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Significant OPEX Cost Reductions

While Aero-Fac® handles massive flow variations without significant operator intervention, the unique wastewater treatment system also utilises renewable wind energy and extremely low operating and maintenance cost aeration systems. Total annual operating costs are typically around 85% less than conventional activated sludge systems.

Aero-Fac® also requires no sludge handling, removal, testing or disposal by completely self-digesting sludge within the system itself, thereby providing a truly long-term sustainable, low TOTEX, complete and total on-site solution.

CLICK HERE to learn about our various low-energy wastewater treatment systems and options.

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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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