Kelda Water Services – Cardiff
Strathkelvin achieved annual savings of £380,000, 26% energy reduction, 3.9GWh and 2994 tonnes of carbon reduction per annum for this client in relation to aeration energy optimisation.
The aeration optimisation of a 16 basin SBR plant running in ICEAS (Intermittent Cycle Extended Aeration System) mode was under taken by changing the operating parameters from the traditional design of dissolved oxygen (DO) control to a scientific approach using respirometry. Measuring the critical oxygen point for carbonaceous and nitrification bacteria and combining this with in-situ Oxygen Uptake Rate measurements, forms the basis of supplying only the correct levels of oxygen for the required amount of time to break down the influent BOD and Ammonia levels. These measures can be used to calculate when treatment is complete and therefore tailor the energy requirements of the site to suit the aeration supply needs. The resultant changes have led to sustainable operational savings of over 20% of aeration energy consumption and reducing carbon emissions whilst maintaining compliance.
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