A comprehensive model of simultaneous denitrification and methanogenic fermentation processes

Authors

  • A. Evren Tugtas,

    1. Department of Environmental Engineering, Bahcesehir University, Istanbul, Turkey
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  • U. Tezel,

    1. School of Civil and Environmental Engineering, Georgia Institute of Technology, 311 Ferst Drive, Atlanta, Georgia 30332-0512; telephone: 404-894-9367; fax: 404-894-8266
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  • Spyros G. Pavlostathis

    Corresponding author
    1. School of Civil and Environmental Engineering, Georgia Institute of Technology, 311 Ferst Drive, Atlanta, Georgia 30332-0512; telephone: 404-894-9367; fax: 404-894-8266
    • School of Civil and Environmental Engineering, Georgia Institute of Technology, 311 Ferst Drive, Atlanta, Georgia 30332-0512; telephone: 404-894-9367; fax: 404-894-8266.
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Abstract

The denitrification process was incorporated into the IWA Anaerobic Digestion Model No. 1 (ADM1) in order to account for the effect of denitrification on the methanogenic fermentation process. The model was calibrated and optimized using previously published experimental data and kinetic parameter values obtained with a mixed, mesophilic (35°C) methanogenic culture. Model simulations were used to predict the effect of nitrate reduction on the methanogenic fermentation process in batch, semi-continuous, and continuous flow reactors experiencing operational changes and/or system disturbances. The extended model clearly revealed the importance of substrate competition between denitrifiers and non-denitrifiers as well as the impact of N-oxide inhibition on process interactions between fermentation, methanogenesis, and denitrification. Biotechnol. Bioeng. 2010;105: 98–108. © 2009 Wiley Periodicals, Inc.

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