Yorkshire Water's Withernsea 15,000 PE Aero-Fac® WwTP Handles 2x Peak Flow/Loads Automatically.
Startup, commissioning and operation of the new Aero-Fac® WwTP at Withernsea is beginning after 4 years of joint study and planning by Yorkshire Water, Gurney Environmental and Stantec. Yorkshire Water had spent considerable time and effort researching various options, but saw excellent benefits from the well-proven and time-tested Aero-Fac® technology that has been successfully used elsewhere in England and Scotland over the past two decades.
Twenty years ago in 2000, Montgomery Watson Projects (now Stantec) constructed the first Aero-Fac® WwTP in the UK for Tayside Regional Council/North of Scotland Water Authority (NoSWA) at Errol, Scotland. In 2019 Gurney Environmental Ltd and Stantec worked with Yorkshire Water to develop Yorkshire's 15,000 PE WwTP at Withernsea that will be the largest Aero-Fac® WwTP in the UK, and was selected in place of the activated sludge plant that had been initially proposed.
First new WwTP for Yorkshire Water in about 20 years has been designed to be incredibly flexible and sustainable with low carbon footprint.
Meeting the Challenges of Climate Change and Stormwater Overflows
Aero-Fac® is uniquely suited to meet the many challenges of climate change, including meeting new legal requirements for stormwater overflow containment. Aero-Fac® offers an extremely low carbon footprint, dramatic energy savings, no sludge production or handling, plus energy-free disinfection, thereby making effluent suitable for irrigation water re-use or safe-bathing waters whether discharged to river or sea. Nearby existing Aero-Fac® Northumbrian Water’s Waren Mill WwTP as an example has been operating odour-free with over 10x peak flows/loads, automatically handling surges without operator intervention or problematic discharges. The Withernsea Aero-Fac® has been designed to automatically accommodate a 2x flow/load condition without operator intervention.
Enhanced, Lower-cost Disinfection
As an example of a “greener”, lower maintenance and cost approach, the UV system typically required by the Environment Agency was engineered out of the Withernsea WwTP as a result of monitoring carried out by Stantec at other Aero-Fac® wastewater treatment plants around the UK that demonstrated that the wwtp had met the discharge requirements without the need for UV.
The unique combination of inherent disinfection provided by stabilisation ponds, enhanced by the continual gentle mixing provided by Gurney Environmental's unique wind powered SERIES 3 aerator/mixers ensure that cell contents are repeatedly exposed to the sun for natural UV kill. This inherent benefit combined with longer retention/ stabilisation times produces an effluent that is safe for irrigation reuse, which according to the EU and various articles and papers on climate change, is going to be needed in the future. This also has the advantage where wastewater treatment systems can operate with better disinfection capabilities and require smaller or even no tertiary disinfection.
Zero Sludge Handling
Additionally, the new WwTP at Withernsea will have no need for sludge removal, meaning no sludge lorry tanker movements and the impact on traffic this brings. All sludge is digested within the primary stage of the Aero-Fac® system as evidenced by 20+ years of operation at Errol, Scotland.
The Withernsea Project
The work at Withernsea is part of a £26 million scheme to move the existing wastewater treatment works further inland due to coastal erosion.
The Withernsea Aero-Fac® will be the first new wwtp constructed by Yorkshire Water in about 20 years and underscores their commitment to using highly sustainable technology that can reduce total 20-year operating costs (OPEX) by 70-90% as compared to often used conventional activated sludge options.
The Search for Sustainability
When the new construction was originally announced for Withernsea, this is what Yorkshire Water had to say:
"Withernsea Wastewater Treatment Works (WwTW) is located to the south of Withernsea, close to the village of Hollym. Since 2015, we’ve engaged with stakeholders and local residents on a long term solution. The new Aero-Fac® technology as supplied by Gurney Environmental will be more sustainable and has a much lower carbon footprint as it uses little energy and is able to treat the wastewater to an excellent standard."
Yorkshire Water’s Communications Advisor John Bond went on to say: “Our proposal is a step away from traditional treatment works and means we are opting for a much greener, more environmentally friendly option. The new proposal means construction times will be reduced, traffic movements can be minimised and once finished, the site will be virtually noise free. In addition, visual impacts and the risk of odour will be greatly reduced.”
Yorkshire Water’s Bond continued: “Our existing facility in Hollym, near Withernsea needed to be replaced as it is now only 40 metres from the sea due to rapid coastal erosion in the area. By building a new treatment facility inland, we’re able to look at new, alternative options for treating the town's wastewater, and we feel Gurney Environmental’s experience and track record provide us with the best solution for both ourselves and our customers for the future.”
Several Unique Wastewater Treatment Solutions from Gurney Environmental
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