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

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The objective of this investigation was to extend an earlier study (Bilyk et al., 2008) on applying the biofilm model to methanol-fed denitrification filters by simulating the performance of a glycerin-fed (MicroCglycerin™) denitrification filters at the Littleton Englewood Wastewater Treatment Facility in Colorado. The main focus of the effort was to calibrate to diurnal dynamic performance over one week of winter operation (average temperature 14.7°C). Fifteen-minute online flow and nutrient analyzer data was utilized to obtain a robust and accurate calibration. Another component of the modeling study was to assess the yield coefficient and heterotroph maximum specific growth rate parameters for MicroCglycerin™, which were validated through model calibration. Other observations of note are that the C:N ratio varied more than expected (2–10 kgCOD/kgN), and that the model predicted a significant amount of COD in the effluent, but this was much higher than what was actually observed. The C:N ratio and potential COD breakthrough is an area where further investigation is needed. Overall, the glycerin-fed filter at the LEWWTP worked very well and discharged a NOx-N concentration of about 1.5 mg/L, removing an impressive 19 mg/L of NOx-N on a daily basis. As previous work demonstrates (Ledwell et al, 2010), glycerin has been successfully utilized on denitrification filters provided the proper operational adjustments are made.
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Keywords: Denitrification; carbon source; filter; glycerin; glycerol; methanol; modeling; nitrate removal

Document Type: Research Article

Publication date: 2011-01-01

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