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Full-Scale Dynamic Testing Advances Fundamental Understanding of Denitrification Filters

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The objective of this investigation was to evaluate whether the BioWin biofilm model can be used to simulate denitrification filters, and what changes, if any, are required to the default parameters. The biofilm model provided in BioWin™ Version 3.0.1 was successfully modified and calibrated to denitrification filter effluents from three different wastewater treatment plants. The default physical characteristics of the biofilm model are representative of moving bed bioreactors and integrated fixed film activated sludge processes. As a first step, these physical properties (media specific area, media specific volume, and percent of reactor filled with media) were modified to be representative of denitrification filters. Secondly, the appropriate model configuration was selected. During calibration, additional biofilm parameters such as the assumed biofilm thickness and the assimilative denitrification reaction were modified. Based on the results of this study, which includes full-scale denitrification filter stress-testing, it may be appropriate to size denitrification filters for a loading rate of 3 gpm/sf if the filters will be used to trim 5 parts or less of nitrogen. However, design criteria such as minimum design temperature, filter influent DO concentration, and methanol dose will also affect performance. Continued refinement of the denitrification filter model with cold weather testing is recommended.
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Document Type: Research Article

Publication date: 01 January 2008

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