Effet de la variabilité du fractionnement de la pollution carbonée sur le comportement des systèmes de traitement des eaux usées par boues activées

Abstract : A miniaturized method has been developed for the fractionation of Chemical Oxygen Demand (COD) in wastewater in order to assess its variability and its effects on the behaviour of wastewater treatment plants by activated sludge. Biodegradability tests have been performed in batch reactor on daily composite samples grabbed by dry weather with a 1h sampling interval. The method has been applied on samples from two urban wastewater treatment plants. The samples were analysed for total and soluble COD, Biological Oxygen Demand, turbidity, total suspended solids and N-NH3. UV-visible and fluorescence spectra have also been collected. It has been observed, as in literature, that the biodegradable fractions are the most significant ones in terms of concentration. A variability of the fractionation during the day has been observed, although it was not possible to determine definite tendencies for particular fractions. In order to evaluate the effect of the variability of the fractionation, the Benchmark Simulation Model n°1 has been used. The sensibility analysis has been performed in open loop. The simulations allowed verifying the impact of the variability of the fractionation on a treatment plant based on a classical setup for the treatment of carbon and nitrogen. The COD concentrations of the plant effluent are affected by the ratio between the biodegradable fraction and the non-biodegradable one, although staying in an acceptable limit according to the discharge limits. The same is not true for the nitrogen, which are close to these limits
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Maria Do Carmo Lourenço da Silva. Effet de la variabilité du fractionnement de la pollution carbonée sur le comportement des systèmes de traitement des eaux usées par boues activées. Autre. Institut National Polytechnique de Lorraine, 2008. Français. ⟨NNT : 2008INPL027N⟩. ⟨tel-01752992⟩

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