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Observations on the Performance and Modeling of Glycerin- and Methanol-fed Denitrification Filters

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The objective of this investigation was to utilize the full-scale denitrification filter data from five treatment plants to explore the significance of the following variables on nitrate removal rate: (a) nitrate loading rate (NLR), (b) hydraulic loading rate (HLR), (c) temperature, and (d) PO4- P:NO3-N ratio. Much of this data was gathered in prior studies (Bilyk et al. 2008 and 2011; Ledwell et al., 2010). NLR was statistically significant in all data sets. HLR was found to be statistically significant in three of the five data sets. The two data sets where HLR was not significant had average HLRs of <1.2 gpm/sf, which is almost 50 percent less than the typically recommended design criteria of 2 gpm/sf. Temperature was statistically significant in the two data sets that had the highest HLRs. The more conservative temperature model predicts nearly 1 mg/L additional nitrate in filter effluent at 12 than at 26°C. Filter influent phosphorus to nitrate ratios were not a significant predictor of the NRR even when filter influent PO4-P:NO3-N ratios were extremely low (0.02 lb/lb). On average, methanol-fed filters utilized less phosphorus (0.018 lb/lb) than glycerin-fed filters (0.033 lb/lb).
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Keywords: Denitrification; carbon; filter; glycerin; glycerol; methanol; modeling; phosphorus limitation

Document Type: Research Article

Publication date: 01 January 2011

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