The aim of the work was to quantify the influence of the simultaneous presence of flocs and granules in the nitrifying activity in a sequencing batch airlift reactor (SBAR). The nitrification rate and oxygen limitation of flocs, granules and hybrid sludge was investigated using respirometric assays at different dissolved oxygen concentrations. The spatial distribution of Ammonium Oxidizing Bacteria (AOB) and Nitrite Oxidizing Bacteria (NOB) was investigated using fluorescence in situ hybridization (FISH). Results showed that the nitrification rate was much less sensitive to oxygen limitation in systems containing a fraction of flocs than in pure granular sludge. Ammonium Oxidizing Bacteria (AOB) were found to be distributed in similar quantities in flocs and granules whereas the Nitrite Oxidizing Bacteria (NOB) were located preferentially in granules. This study showed that the presence of flocs with granules could increase the robustness of the process to transitory reductions of aeration.
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Research Article|
January 01 2012
Effects of oxygen concentration on the nitrifying activity of an aerobic hybrid granular sludge reactor
Ahlem Filali;
1INSA, UPS, INP, LISBP, Université de Toulouse, 135 Avenue de Rangueil, F-31077 Toulouse, France; INRA, UMR792 Ingénierie des Systèmes Biologiques et des Procédés, F-31400 Toulouse, France and CNRS, UMR5504, F-31400 Toulouse, 31077 Toulouse Cedex 04, France
E-mail: filali@insa-toulouse.fr
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Yolaine Bessiere;
Yolaine Bessiere
1INSA, UPS, INP, LISBP, Université de Toulouse, 135 Avenue de Rangueil, F-31077 Toulouse, France; INRA, UMR792 Ingénierie des Systèmes Biologiques et des Procédés, F-31400 Toulouse, France and CNRS, UMR5504, F-31400 Toulouse, 31077 Toulouse Cedex 04, France
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Mathieu Sperandio
Mathieu Sperandio
1INSA, UPS, INP, LISBP, Université de Toulouse, 135 Avenue de Rangueil, F-31077 Toulouse, France; INRA, UMR792 Ingénierie des Systèmes Biologiques et des Procédés, F-31400 Toulouse, France and CNRS, UMR5504, F-31400 Toulouse, 31077 Toulouse Cedex 04, France
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Water Sci Technol (2012) 65 (2): 289–295.
Article history
Received:
March 30 2011
Accepted:
July 28 2011
Citation
Ahlem Filali, Yolaine Bessiere, Mathieu Sperandio; Effects of oxygen concentration on the nitrifying activity of an aerobic hybrid granular sludge reactor. Water Sci Technol 1 January 2012; 65 (2): 289–295. doi: https://doi.org/10.2166/wst.2012.795
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