Comportement du procédé R3F en nitrification : suivi, modélisation dynamique et limites du procédé

Abstract : The R3F / MBBR biofilm process is a relatively recent technology in France able to treat organic and nitrogen matters from domestic wastewaters. Its advantage is its compactness due to the development of a significant quantity of bacterial biomass in a tank with low surface area. Thus, the R3F / MBBR process is a relevant solution for nitrogen treatment in a difficult property context. The principle of this technology is the plastic carriers of few centimeters use, on which a bacterial biofilm grows. These carriers freely move in the tank thanks to a air flow rate or a mixing. Nowadays, modeling has become a relevant tool for design. Lots of biofilm models exist but few research works have led to the carrying out of a R3F / MBBR dynamic model for engineering and able to simulate the process in real conditions. Thus, the principal objective of this thesis is the achievement of a R3F / MBBR dynamic model useful in engineering. The validation of such a model with experimental measurements has never been carried out and will represent an original point. The operating of a R3F pilot-scale wastewater plant fed with domestic wastewater has been studied. The follow-up of the pilot-scale unit, during almost 2 years, has first allowed evaluating the performances of 3 carriers in steady state, a work that has never been achieved. Then, the dynamic state has been studied in applying peak-loads but conserving the daily loading. During 4 days, an intensive measurement campaign in dynamic state has been used to calibrate the model. Another 30 days in steady state has been used to validate the model. This modeling work has led to a calibration protocol which informs about the parameters to measure, and to adjust in order to obtain a R3F / MBBR dynamical model able to simulate its operating in real conditions. Some measurement protocols have also been created to estimate the value of parameters to measure. Some predictive simulations carried out with the calibrated model have then allowed assessing the process in new operating conditions. A critical study of the model has led to the identification of some weaknesses which limit the quality of simulations. Thus, propositions to enhance the model have been brought.
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Ugo Barry. Comportement du procédé R3F en nitrification : suivi, modélisation dynamique et limites du procédé. Ecologie, Environnement. AgroParisTech, 2013. Français. ⟨NNT : 2013AGPT0024⟩. ⟨pastel-00925421⟩

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