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Nelson, New Zealand Installs Phase 1 of Accel-o-Fac WWTP Upgrade.

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Wednesday, 19 April 2017 00:13

GURNEY ENVIRONMENTAL technicians have completed the installation of phase 1 of the Accel-o-Fac® upgrade for the City of Nelson's wastewater treatment plant.

The first phase of the order included the supply of wind-powered SERIES 3 aerator/mixers to replace the existing electric aspirator and brush aerators, which are costly to run and maintain (OPEX). Based on aerial photographs, it was also evident that the electric aeration was not capable of providing uniform conditions throughout the large treatment lagoon.

Following a consultation process with Gurney Environmental, Nelson City Council selected the Accel-o-Fac system based on its well-proven and time-tested sustainability credentials and its ability to improve the wastewater treatment process in primary/facultative, secondary and polishing lagoons. The City Council also appreciated Accel-o-Fac’s ability to extend the life of the existing wwtp assets. The order also followed the successful demonstration of the Accel-o-Fac system at nearby Australian water utilities including the Toora wwtp owned and operated by South Gippsland Water. At that particular Australian facility, the Accel-o-Fac upgrade improved wastewater processing, increased typical DO levels (processing power and odour removal), and significantly reduced energy costs (OPEX).

Advanced Technology

The Accel-o-Fac system is advanced technology that can be used as a new-build design or to upgrade existing lagoon-based systems, providing accelerated processing rates, increased DO levels, elimination of short circuiting, accelerated disinfection, odour elimination and accelerated total sludge digestion — all of which allows greater loads to be applied to existing lagoons, thereby extending their life whilst improving performance.

Zero-to-Low Energy Costs

In many cases, the wind-powered Accel-o-Fac system can have a zero ongoing energy cost, yet provide robust treatment. In the case of the Holkham Estate installation operating for over 10 years in Norfolk, UK, the system has maintained superb effluent quality, no odours and no sludge removal or handling required over the decade of use. Obviously, total ongoing OPEX is incredibly low.

At Toora, Australia where an Accel-o-Fac system supplemented and reduced the need for existing surface aerators, the system’s extremely low operating costs provided better treatment and odour control while cutting overall energy costs by 72%, thereby completely paying for the upgrade.


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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