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20-years is often referred to as the expected lifetime of a mechanical WwTP, yet after 20 years the Errol Aero-Fac® wastewater treatment plant continues to perform with incredibly low ongoing OPEX, no sludge, no odour and little in manpower and energy.

In 2001, Gurney Environmental along with project partners Montgomery-Watson (now Stantech) and then North of Scotland Water christened the very first Aero-Fac® WwTP in the UK (Click Here to see full Case Study). The idea? Provide consistent effluent quality for the sensitive Tayside estuary area, eliminate bothersome sludge lorry movements, accommodate both long-term growth and peak load/flow swings spanning 20+ years, whilst requiring minimal manpower and energy. Plus install a treatment works that would not create any odour issues for the area.

Errol, Scotland Aero-Fac® WwTP in 2021

2021 celebrates 20 years of successful operation for the Errol facility. According to Robert Dey of Scottish Water, "The [Aero-Fac®] system offered high process performance, but with low OPEX costs compared to a traditional plant, both in terms of operator attendance, maintenance and power usage, and in the fact the plant only needed sludge removal at intervals of several decades.

"In the 20 years since the plant was brought into service, it has indeed had both low maintenance costs, and low operator input. At the last testing it has been found to have very low sludge build up and at this anniversary of its commissioning, there has had to be no consideration of emptying to remove sludge build-up. We have never had any odour complaints at Errol.

"In tandem, it has given consistent performance with a 100% record in terms of compliance with consent conditions. Another important element of the Aero-Fac® system was low energy costs and with the wind-driven SERIES 3 aerators augmenting the mains-powered blowers, it has reduced the potential energy costs. Although it was not such a high consideration 20 years ago, Errol also supports Scottish Water’s moves to becoming carbon neutral."

Dey went on to say, "The Aero-Fac® system also uses much less concrete than traditional forms of construction, with much of the material dug out to form the two ponds being re-used to form their wall structure. The aforementioned reduction in OPEX costs and the renewable energy element means that in both CAPEX and OPEX terms, the Aero-Fac® system accords with Scottish Water’s carbon-neutral vision.

"Gurney-Environmental have since installed two further Aero-Fac® systems for Scottish Water and are currently in discussions re a number of projects at design stage."

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