DESIGN OF NITRIFYING TRICKLING FILTERS
Abstract:The United Kingdom is in the middle of the third 5 year Asset Management Program (AMP 3) since privatisation began in England and Wales. At the outset of AMP 3 the Environment Agency set new ammonia discharge permits for many existing works.
Most of these new works require the addition of tertiary treatment to meet these new discharge permits and nitrifying trickling filters (NTF)s may provide a cost effective solution for a considerable number of these works.
This paper examines the performance of two existing works where plastic media NTFs have been incorporated into the treatment process. The analysis concentrates on the performance of the NTFs with respect to the ammonia discharge quality they can be expected to meet. In addition the paper presents data to demonstrate their effect on BOD, suspended solids and alkalinity.
A reliable and simple method for the engineer to size the filters is essential for the successful implementation of this technology. This paper uses 2 popular design methods to model the predicted performance of the NTFs and compares the results to the actual performance from the filters under known conditions.
The results show that a NTF tertiary treatment plant can reliably meet an ammonia quality of 3mg/l for a 95percentile of samples, in a UK type climate.
Document Type: Research Article
Publication date: 2002-01-01
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