A sewage plant is to be the first in the UK to use a technology system which dramatically cuts energy and operational costs.
The innovative three-stage biological sewage treatment process at Nottingham’s Stoke Bardolph wastewater treatment works has been developed by Severn Trent Water (STW) together with design and build subcontractor NMCNomenca and the Dutch company Paques. The project is now approaching final commissioning.
The technology includes the first two Phospaq reactors in the UK, which alleviates struvite-related damage to equipment further in the process, thereby reducing operational and maintenance problems. STW says it expects to save £70,000 per year through this.
The technology means the treatment effectively removes phosphorus, recovers a phosphate fertiliser, generates biogas which then provides energy for the plant, and delivers efficient ammonia removal at the site. The plant is also highly automated, with operational issues raised through an automated system.
NMCNomenca project manager Teresa Jeffcoat said: “By working in close partnership with Paques and the client, Severn Trent Water, we have achieved a system that demands only 50% of the air of a standard activated-sludge plant. Power consumption and energy costs have been slashed.
“Savings are also made when the new processes are compared with conventional nitrification and denitrification processes. Operational costs are reduced by over 50%, as are CO2 emissions,” she added.
The plant treats sewage from a population of 650,000 population as well as trade waste from a livestock rendering plant.