An innovation success story: chemical-free process of ammonia recovery from municipal wastewater: PRESENTATION ONLY
Dr. Donna Rawlinson, Commercial Manager, Northumbrian Water, UK
(Free)
Northumbrian Water’s Environment Strategy
• Our Howdon Journey so far
• NWL AAD Returned liquors – how big is the prize?
• Northumbrian Water’s Innovation
• OFWAT Innovation Fund Research Project
• Organics Process Overview
• Results to Date
• Conclusions
• Northumbrian Water’s has two AAD plants, treating >70,000tds sludge per year
• We already produce and reuse
• 165GWh biogas. We plan to increase this to 175GWh by 2035.
• 96,000tonnes of digestate which is used as a fertiliser.
• 8MWth waste heat available (Bran Sands and Howdon)
• As a by-product from the digestate we produce 2,500,000m3
returned liquors, which is treated back through main treatment works.
• Main component, suspended solids, COD and 3,000mg/l Ammonia•
The prize:
• Opportunity to recover 4,400 tonnes of high strength ammonia.
• Energy savings for main STW (40% reduction in aeration costs at Bran Sands)
• Ability to meet future Total N implications
• Carbon emission saving from for main STW (gaseous emissions reduction (NOx))