SKIPTON, UK – A £1.7 million ammonia removal plant has been completed by ACWA Services for United Utilities, at the company’s Leigh Wastewater Treatment Plant (WWTP) in Greater Manchester.
The project, awarded by framework contractor KMI Plus on behalf of United Utilities, is part of an overall upgrade to sewage sludge processing capacity at Leigh WWTP to improve sludge recycling and disposal to land within Nitrate Vulnerable Zones.
ACWA’s activated sludge technology – known as Amtreat - has been incorporated into the WWPT, which has a processing volume of 805 m3/day.
Leigh WWTP acts as a processing centre importing sludge from outlying sites and will treat sludges utilising advanced digestion and dewatering which will generate high strength ammonia liquors. These include centrifuge liquors from both raw sludge thickening and digested sludge de-watering processes.
The new Amtreat plant is designed to provide full nitrification-denitrification with a minimum 95% ammonia removal. Once operational, treated liquor will be pumped back to the head of the main treatment works, to complete the cycle.
Jane Horseman, production manager at Leigh for United Utilities, said: “The modernisation project at Leigh WWTP lead by framework contractor KMI Plus will improve quality, capacity and efficiency for sewage sludge processing including energy recovery. Treating wastewater flows containing high quantities of ammonia is crucial and ACWA’s treatment process, tried and tested at a number of sites, will deliver a robust and flexible solution for ammonia removal.”
Peter Brewer, general manager of ACWA Services, said: “Managing ammonia levels is an increasing issue for water companies where advanced thermal hydrolysis and digester technologies are utilised to provide an enhanced sludge suitable for recycling to land, especially in Nitrate Vulnerable Zones.”
ACWA’s Amtreat solution was developed in consortium with four UK water companies and is now in operation, commissioning or construction at six plants in the UK, including Anglian Water, Southern Water, Seven Trent and now United Utilities.
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