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Oxygen Control and Improved Denitrification Efficiency by Means of a Post-Anoxic Reactor

Author

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  • Giordano Urbini

    (Department of Biotechnologies and Life Sciences, University of Insubria, Via G.B. Vico 46, I-21100 Varese, Italy
    These authors contributed equally to this work.)

  • Renato Gavasci

    (Department of Civil Engineering and Computer Science Engineering, University of Rome "Tor Vergata", Via Politecnico 1, I-00133 Roma, Italy
    These authors contributed equally to this work.)

  • Paolo Viotti

    (Department of Civil and Environmental Engineering, University of Rome "La Sapienza", Via Eudossiana 18, I-00184 Rome, Italy
    These authors contributed equally to this work.)

Abstract

The presence of dissolved oxygen (DO) in biological denitrification reactors determines inhibition effects on the denitrification rate. The article shows the results of an experimental study to control the DO concentration in the pre-denitrification stage by a post-anoxic reactor. The results demonstrate that the post-anoxic reactor is very effective in improving the nitrogen removal efficiency because it causes a considerable reduction of the DO content in the mixed liquor recycle sent to the pre-denitrification reactor. This reduction is influenced by both the retention time and the F : M ratio (referred to the denitrification and the oxidation-nitrification volume). In fact, a retention time and a F : M ratio equal to 1.5 h and 0.130 kgBOD 5 kgMLVSS −1 ·day −1 , respectively, allow to limit DO in the post-anoxic reactor at 0.31 mgO 2 ·L −1 . Such concentration determines a DO concentration of 0.11 mgO 2 ·L −1 in the pre-denitrification reactor and, consequently, a denitrification efficiency of 91%. Moreover, the contribution of the endogenous denitrification to the whole denitrification efficiency was found negligible. The paper contributes to the progress in nitrogen removal from sewage, a fundamental issue for a sustainable management of water resources.

Suggested Citation

  • Giordano Urbini & Renato Gavasci & Paolo Viotti, 2015. "Oxygen Control and Improved Denitrification Efficiency by Means of a Post-Anoxic Reactor," Sustainability, MDPI, vol. 7(2), pages 1-12, January.
    • Handle: RePEc:gam:jsusta:v:7:y:2015:i:2:p:1201-1212:d:45040
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    References listed on IDEAS

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    1. Vincenzo Torretta & Marco Ragazzi & Ettore Trulli & Giovanni De Feo & Giordano Urbini & Massimo Raboni & Elena Cristina Rada, 2014. "Assessment of Biological Kinetics in a Conventional Municipal WWTP by Means of the Oxygen Uptake Rate Method," Sustainability, MDPI, vol. 6(4), pages 1-15, April.
    2. Massimo Raboni & Vincenzo Torretta & Giordano Urbini, 2013. "Influence of Strong Diurnal Variations in Sewage Quality on the Performance of Biological Denitrification in Small Community Wastewater Treatment Plants (WWTPs)," Sustainability, MDPI, vol. 5(9), pages 1-11, August.
    3. Vincenzo Torretta & Giordano Urbini & Massimo Raboni & Sabrina Copelli & Paolo Viotti & Antonella Luciano & Giuseppe Mancini, 2013. "Effect of Powdered Activated Carbon to Reduce Fouling in Membrane Bioreactors: A Sustainable Solution. Case Study," Sustainability, MDPI, vol. 5(4), pages 1-9, April.
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    1. Massimo Raboni & Paolo Viotti & Elena Cristina Rada & Fabio Conti & Maria Rosaria Boni, 2020. "The Sensitivity of a Specific Denitrification Rate under the Dissolved Oxygen Pressure," IJERPH, MDPI, vol. 17(24), pages 1-12, December.

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