Operational Control of a RAS Fermentation Process for Enhancing Biological Phosphorus Removal
Abstract:The ability of Enhanced Biological Phosphorus Removal (EBPR) facilities to achieve acceptable effluent phosphorus levels can be hampered by low COD to phosphorus and/or COD to nitrogen influent ratios. Minimizing the need for external carbon, or iron, while achieving improved EBPR performance has been successfully demonstrated through innovative fermentation strategies. Modeling work that was done during the design phase that was based on a pilot plant that included a two-day retention time fermentation phase, justified the construction of the return activated sludge (RAS) fermentation process at the Loughborough sewage treatment works. Despite the pilot plant operational problems and model uncertainty, there was sufficient evidence to suggest that RAS fermentation could be advantageous at the Loughborough site. During commissioning, initial problems with the retention time in the full-scale fermenter caused some disruptions to the process, but these issues were identified and rectified. Now several years later, the Loughborough plant has been operating successfully and recent discussions about implementing this option at other Severn Trent Water (STW) sites is driving a renewed interest in the Loughborough experience.
Document Type: Research Article
Publication date: 2012-01-01
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