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Tuesday, 30 January 2018 22:42

Gurney Environmental start 2018 with an order for a new Aero-Fac® wwtp for Northumbrian Water. The water company's first Aero-Fac system replaces an existing SAF plant.

Dramatic Flow Variation Control

Working with Northumbrian Water and their consultants, MWH Global (now part of Stantec) and Mott-MacDonald-Bentley, Gurney Environmental process engineers developed the new wastewater treatment system to meet a normal winter population of 200 but also accommodate a summer population of almost 3,000!

This over 10x flow variation can create issues for many wwtp designs. In the case of the existing SAF, Northumbrian Water has been required to tanker away excess wastewater flows over the 150-pe SAF design with an associated 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.

Significant OPEX Cost Reductions

While Aero-Fac handles massive flow variations without significant operator intervention, this unique wastewater treatment system also utilises renewable wind energy and extremely low operating cost aeration systems. Total operating costs are typically around 85% less than conventional activated sludge systems as documented in the UK by MWH and others as far back as 1999-2000 when the first Aero-Fac was built in the UK.

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

Building on an 18+-year track record of successful performance of Aero-Fac systems in the UK, Northumbrian Water becomes the latest water company to adopt the use of this unique technology to meet their newest requirements for wastewater treatment.

Several Unique Wastewater Treatment Solutions from Gurney Environmental

Gurney Environmental offer several variations of the Aero-Fac system that include:

  • Full treatment, standalone solutions (Aero-Fac);
  • Pretreatment systems to solve issues and expand existing filter plants (Aero-Fac PTS);
  • Standalone sludge digestion systems (Aero-Fac SDS).

Additionally, the very unique and economical Accel-o-Fac® system offers a zero-to-low energy solution that provides incredibly low OPEX with very low initial CAPEX. In many cases, no energy costs plus no sludge handling costs or complexities make Accel-o-Fac extraordinarily sustainable and economical initially and long-term. Accel-o-Fac has been used for many years in the UK at such locations as Holkham Hall and Village.


We've already found that the ponds work a lot better, they are a lot cleaner and functionally look a lot better than what they were previously. It seems to be working at this stage, so we're quietly confident that it's going to be a good investment.

Richard Kirby Regional Sewerage Business Unit Manager Nelson, New Zealand

...there is no doubt about it, the ResMix system works! Having started with a volatile and inconsistent chlorine residuals in our supply, we are now using the WEARS product to mix and dose our tanks. We are not alone in our experiences here. All I can say is that the results speak for themselves.

Doug Moorby Manager of Engineering Operations Norromine Shire, Australia

Adding the Accel-o-Fac® system to South Gippsland Water treatment cells where traditional surface aeration was previously used allowed the corporation to significantly reduce energy use. The savings in kWh are excellent with one application saving 72% in energy compared to the previous year.

Brett Vurlow South Gippsland Water Victoria, Australia

The fact that there is no associated sewage odours [with the Accel-o-Fac wwtp] meant that the system could be located relatively near to the village, and, after 10 years of use, no sludge removal has been needed.

Stephen Twyford Land & Property Department, Holkham Estate, Norfolk, UK

These results show that the [ResMix] mixer is providing a fully mixed water column and preventing conditions for manganese and nutrient release from the sediments.

Stuart Holden Process Engineer, United Utilities Engineering Ridgegate Reservoir

We are very pleased to be using this innovative management system in the reservoir at Pontsticill. This investment will improve the water quality for customers in the area and ensure they continue to receive a top quality supply of drinking water long into the future.

Roy Samuel Capital Delivery Manager, Welsh Water - Dwr Cymru

The Aero-Fac system at Windsor has to date met and exceeded our consent discharge levels, and we have been very happy with the system installed.

Andrew Dunning The Crown Estate Windsor

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