Nitrifying Biomass Growth in Activated Sludge: Impact of Long-Term Disturbances on Nitrogen Removal Capacity - Ecole Nationale du Génie de l'Eau et de l'Environnement de Strasbourg Accéder directement au contenu
Communication Dans Un Congrès Année : 2002

Nitrifying Biomass Growth in Activated Sludge: Impact of Long-Term Disturbances on Nitrogen Removal Capacity

Croissance de la biomasse nitrifiante en boue activée : impact des perturbations à long terme sur la capacité à éliminer le nitrogène

Résumé

To save nitrification at low temperature in activated sludge treatment plants a minimal sludge retention time (SRT) should be maintained. Based on the limitation of SRT, the design procedure induces a restriction of both carbon and nitrogen applied loads that affects nitrification capacity and overvalues the minimal required volume of aeration tank. The long-term influence of the main parameters (SRT, daily volumetric nitrogen loading, daily aeration duration) was studied. An experiment was carried out during 100 days on a pilot plant fed with domestic influent. Stable conditions of low temperature and sludge retention time were maintained. Nitrification performances were assessed by daily mass balance and four detailed monitoring for ASM1 calibration. Beside SRT, it was demonstrated that daily aeration duration and nitrogen load are the key parameters of the autotrophic growth dynamic. All together affect the value of the concentration of autotrophic biomass and the nitrification kinetics. Mass balance was found to be as accurate as ASM1 calibration procedure to assess the maximum autotrophic growth rate, which value was 0.22 ± 0.02 d-1 at 11°C. The results may suggest that N-removal occurs in activated sludge with an alternative nitrification/denitrification process up to a F/M ratio of 0.12 kgBOD5.(kgMLVSS.d)-1, which is 20% more than the conventional design load.
L'influence à long terme des principaux paramètres (temps de rétention des boues, charge volumétrique et quotidienne en nitrogène, durée d'aération quotidienne) a été étudiée.
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Dates et versions

hal-02580501 , version 1 (14-05-2020)

Identifiants

Citer

J.M. Choubert, Y. Racault, A. Grasmick, C. Beck, A. Heduit. Nitrifying Biomass Growth in Activated Sludge: Impact of Long-Term Disturbances on Nitrogen Removal Capacity. IWA 3rd World Water Congress, Melbourne, AUS, 7-12 april 2002, 2002, Australia. pp.8. ⟨hal-02580501⟩
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