Model of simultaneous denitrification and methanogenesis in an Upflow Packed-Bed Biofilm Reactor: Nitrogen compounds' inhibition and pseudo two-dimensional biofilm model
Abstract
Background: The modelling of simultaneous denitrification and methanogenesis (DM) in upflow packed-bed biofilm reactors (UPBR) and the effect of inhibition by nitrogen compounds on methanogenesis has received little attention. This study evaluated the effect using amodel that incorporates a pseudo-two-dimensional biofilm model. Results: The model was validated through comparison with experimental data, and achieved deviations below 5% for the liquid and gas phases. The model indicated that biomass stratification exists throughout the reactor and within the biofilm interior. At C/N ratios close to the stoichiometric C/N ratio, the process achieves efficiencies greater than 70% for nitrogen load rate (NLR) < 270 mg NO3 --N dm-3 h-1. At high C/N ratios (50 mg total organic carbon (TOC) mg-1 NO3 --N), the process achieves efficiencies greater than 70% for organic load rate (OLR) < 83 mg TOC dm-3 h-1. Conclusion: The inclusion of the inhibition of methanogenesis by nitrogen compounds did not improve the predictions. Indeed, mass transfer in the biofilm was the phenomenon that most influenced the process. At C/N ratios close to the stoichiometric C/N ratio, process efficiency depends on the NLR; while at high C/N ratios, process efficiency depends on the OLR. © 2008 Society of Chemical Industry.
Más información
Título según WOS: | Model of simultaneous denitrification and methanogenesis in an Upflow Packed-Bed Biofilm Reactor: Nitrogen compounds' inhibition and pseudo two-dimensional biofilm model |
Título según SCOPUS: | Model of simultaneous denitrification and methanogenesis in an upflow packed-bed biofilm reactor: Nitrogen compounds' inhibition and pseudo two-dimensional biofilm model |
Título de la Revista: | JOURNAL OF CHEMICAL TECHNOLOGY AND BIOTECHNOLOGY |
Volumen: | 84 |
Número: | 2 |
Editorial: | John Wiley & Sons Ltd. |
Fecha de publicación: | 2009 |
Página de inicio: | 254 |
Página final: | 268 |
Idioma: | English |
URL: | http://doi.wiley.com/10.1002/jctb.2033 |
DOI: |
10.1002/jctb.2033 |
Notas: | ISI, SCOPUS |