Nutrient Removal Systems
Pilot-scale BNR plant on-site at the Esholt Wastewater Treatment Plant in Bradford.
Within the UK and Europe the needs for removal of the nutrients nitrogen and phosphorus, is driven by the requirements of the EC Urban Wastewater Treatment Directive and the Freshwater Fisheries Directive. The majority of UK treatment plants have an ammonia consent imposed by the Environment Agency which requires them to achieve nitrification. It is standard design practice in such circumstances to install a denitrification zone to reduce the effluent nitrate concentration which is known to aid the settleability of the sludge. Both biological and chemical phosphorus removal is practiced in the UK and whereas not common, the number of plants that must achieve biological phosphorus removal is slowly increasing. This presents a challenge in the UK where wet winters generate a weak sewage that cannot provide adequate electrons to drive both denitrification and biological phosphorus removal. As a result our group at Leeds is undertaking research into:
- Achieving biological P-removal with weak wastewaters
- Optimising and controlling acetate dosing
- BioWin modelling of BNR processes
- Control of the nitrification process
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