Maximum growth and decay rates of autotrophic biomass to simulate nitrogen removal at 10°C with municipal activated sludge plants | Paramètres cinétiques de la biomasse nitrifiante permettant de simuler l'élimination biologique de l'azote à 10°C pour le procédé boues fonctionnant sous aération prolongée
2008
Choubert, J.M. | Marquot, A. | Stricker, Anne Emmanuelle | Gillot, Sylvie | Racault, Y. | Heduit, A. | Hydrosystèmes et Bioprocédés (UR HBAN) ; Centre national du machinisme agricole, du génie rural, des eaux et forêts (CEMAGREF) | Réseaux épuration et qualité des eaux (UR REBX) ; Centre national du machinisme agricole, du génie rural, des eaux et forêts (CEMAGREF) | ENVIRONMENT CANADA ONTARIO CAN ; Partenaires IRSTEA ; Institut national de recherche en sciences et technologies pour l'environnement et l'agriculture (IRSTEA)-Institut national de recherche en sciences et technologies pour l'environnement et l'agriculture (IRSTEA)
[Departement_IRSTEA]MA [TR1_IRSTEA]TED / EPURE
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Mostrar más [+] Menos [-]Inglés. The present study aims at determining most likely values for the maximum growth rate (mA, max) and the endogenous decay rate (bA) of nitrifiers for activated sludge processes treating municipal wastewater operated at low temperature (10°C). The work used nitrification rate data measured on 10 full-scale plants and 2 pilot plants fed with domestic sewage. This set of data was combined with a modelling and a theoretical approach. The unified values (mA, max = 0.45·d-1 and bA = 0.13·d-1) were obtained at 10°C for the kinetic parameters of the autotrophic biomass in the SRT range 10 to 50 d. In addition, the factors affecting the expectable nitrification rate (rv, nit) were pointed out by a theoretical approach and confirmed by experimental results. For a given SRT, a linear relationship with the nitrogen volumetric loading rate was shown. The COD/TKN ratio of the influent on the nitrification rate was demonstrated. Finally, an operational tool for the verification of the nitrification rate in the design procedure of activated sludge processes is proposed.
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