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The influence of dissolved oxygen concentrationon the nitrification kinetics was studied in the circulatingbed reactor (CBR). The study was partly performed atlaboratory scale with synthetic water, and partly at pilotscale with secondary effluent as feed water. The nitrifi-cation kinetics of the laboratory CBR as a function of theoxygen concentration can be described according to thehalf order and zero order rate equations of the diffusion-reactionmodel applied to porous catalysts. When oxygenwas the rate limiting substrate, the nitrification rate wasclose to a half order function of the oxygen concentration.The average oxygen diffusion coefficient estimated by fittingthe diffusion-reaction model to the experimental resultswas around 66% of the respective value in water. Theexperimental results showed that either the ammonia orthe oxygen concentration could be limiting for the nitrification kinetics. The latter occurred for an oxygen toammonia concentration ratio below 1.5-2 gO2/gN-NH4+for both laboratory and pilot scale reactors. The volumetricoxygen mass transfer coefficient (kLa) determinedin the laboratory scale reactor was 0.017 sˉ¹ for a superficial air velocity of 0.02 m sˉ¹, and the one determined inthe pilot scale reactor was 0.040 sˉ¹ for a superficial airvelocity of 0.031 m sˉ¹. The kLa for the pilot scale reactordid not change significantly after biofilm development,compared to the value measured without biofilm.INTERREG.Fundação para a Ciência e a Tecnologia (FCT) - PRAXIS XXI, project 2/2.1/Bio/37/94

Influence of dissolved oxygen on the nitrification kinetics in a circulating bed biofilm reactor