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The Implications of Cold Weather on Nitrification Treatment Processes
Price: £100
Ref: 11/WW/04/15
ISBN: 1 84057 580 8
There are concerns that, as a result of revisions to ammonia effluent quality requirements, WwTWs in the UK may not be able to comply with more stringent permits for ammonia during extreme cold weather conditions when their nitrification capability is compromised by the reduced activity of nitrifying bacteria. This project collated data on cold weather performance to re-assess the consented 'unusual weather' clauses and thereby allow informed debate with environmental regulators over revised exemption criteria or seasonal consents. The study has shown that in the UK, unusually low wastewater temperatures occurred at over 35% of WwTWs during the winters of 2008/09 and 2009/10. When wastewater temperatures dropped below 5deg C, WwTW effluents exhibited increases in ammonia concentrations of up to 2 mg/l N. The recovery period from a low-temperature process upset takes between 1 week and 1 month and has the potential to place many UK WwTWs at risk of consent failure following a cold weather event. Other EU countries tend to apply relaxed ammoniacal-nitrogen standards to take account of cold weather. This puts the UK Water Industry at a major disadvantage compared to other EU countries.
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On- line Instrumentation Standards and Practices
00/PC/03/1 - ISBN: 1 84057 180 2This report deals with the management and exploitation of on- line measurement in the UK water industry. The results from a survey of the perceptions of managers and practitioners are presented along with other industry data.... More...
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The Environmental Impact of Phosphorus from the Agricultural Disposal of Sewage Sludge - Stage 3
97/SL/02/4 - ISBN: 1 84057 013 XLaboratory, lysimeter and field studies continue to show wide variability the potential bioavailability of phosphorus in sewage sludge. Under operational rates of application, losses of phosphorus in run-off from plots recei... More...
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UKWIR/EA A Unified Methodology for the Determination of Deployable Output from Water Sources - Volume 1
00/WR/18/1 - ISBN: 1 84057 198 5This joint UKWIR/ Environment Agency project examined current practices for determination of surface water and ground water deployable output (DO) and concluded that a unified approach was both desirable and feasible. However... More...
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Exploring the Cost Benefit of Separating Direct Surface Water Inputs from the Combined Sewerage System
09/WM/07/13 - ISBN: 1 84057 533 6Urbanisation and climate change are increasing the volume of rainfall discharging to the public combined sewerage system, resulting in increased risk of flooding and pollution with unnecessary pumping and treatment costs.
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