Proceedings

Going for the one! Upgrading an ASP to achieve low ammonia concentrations: PRESENTATION ONLY

O’Brien, L.1, Cooper-Smith, G.1, Hughes, P.2 and Wohling, A.2, 1Eliquo-Hydrok, UK, 2Mott MacDonald Bentley, UK

(free)

In 2018 the activated-sludge plant at Goscote WwTW was upgraded with the addition of an IFAS (Integrated Fixed Film Activated Sludge) system.  The objective of this work has been to prepare the site for both the increased load (+10% anticipated by 2028) and a tighter ammonia consent (1.3 mg/l).  The installation of IFAS has increased the aerated biomass by 33%, without an increase in reactor volume, and delivers an improved SSVI, meaning no increase in final settlement capacity is necessary. Due to an innovative approach to project phasing, there is the option of adding more IFAS in the future, to increase the treatment capacity further, if required.

The presentation sets out the considerable cost savings possible with IFAS, highlights the lessons learned during the initial phase of operation, and the performance obtained.  While some lessons are unique to IFAS, many are applicable generally and hence will be of interest to anyone considering upgrading their existing plant to meet very tight ammonia consents.  And with Water Companies expected to be ‘even more driven’, to ensure ‘value for money’, by the regulator, preparations for AMP7 underway, and the upgrading of existing assets to meet new consents being considered by many, there are a host of valuable lessons in this presentation for the Water Industry.

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