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Communication Dans Un Congrès Année : 2003

Ammonia and nitrite oxidation rates in the inverse turbulent bed reactor determined by respirometric assay

Résumé

Respirometry, widely used to study kinetics of activated sludge, has been used to measure the oxygen uptake rate (OUR) in a nitrification biofilm process-the inverse turbulent bed reactor. The OUR has been measured at different initial concentrations of ammonia (10-100 mg N-NH4 + L-1) and nitrite (3-60 mg N-NO2-L-1), as well as those of ammonia-nitrite mixtures. The OUR was independent of the initial concentration of ammonia (zero order reaction), but decreased with time. This result can be explained by a decrease in biomass concentration within the reactor during the experiments. Between each experiment, the reactor was washed with a buffer solution at a very high flow rate, that resulted in the washing out of suspended biomass but not of fixed biomass. The loss of biomass was estimated at about 50%, indicating that half the active nitrifiers in the reactor were in the form of suspended biomass. The biomass concentration within the reactor was estimated using a mathematical model and the values obtained were in agreement with the hypothesis.
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Dates et versions

hal-03005662 , version 1 (14-11-2020)

Identifiants

  • HAL Id : hal-03005662 , version 1

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Omar Sánchez, Nicolas Bernet, Jean-Philippe Delgenès. Ammonia and nitrite oxidation rates in the inverse turbulent bed reactor determined by respirometric assay. 5th International Conference on Biofilm Systems, Sep 2003, Cape Town, South Africa. ⟨hal-03005662⟩
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