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Fixed-biofilm reactors in water recirculating aquaculture systems: nitrification kinetics, design criteria and expected performance
Bovendeur, J.; Klapwijk, A. (1989). Fixed-biofilm reactors in water recirculating aquaculture systems: nitrification kinetics, design criteria and expected performance, in: De Pauw, N. et al. (Ed.) Aquaculture: a biotechnology in progress: volume 1. pp. 1061-1067
In: De Pauw, N. et al. (1989). Aquaculture: a biotechnology in progress: volume 1. European Aquaculture Society: Bredene. ISBN 90-71625-03-6. 1-592 pp., meer
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Documenttype: Congresbijdrage
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  • Bovendeur, J.
  • Klapwijk, A.
Abstract
    The elimination of total ammonia by nitrification has been examined in batch experiments in which samples of attached biofilm material were loaded with pre-settled fish tank effluents. Depending on the ratio of the concentrations of total ammonia and dissolved oxygen, the nitrification reaction could be described either by 1/2-order or 0-order kinetics. The biofilm showed ammonia-diffusion-limitation ( 1/2-order kinetics towards the total ammonia concentration) in case the oxygen/total ammonia concentration ratio exceeded 3:6; in other cases oxygen- diffusion-limitation or metabolism-limitation (1/2-order kinetics towards the total ammonia concentration) occurred. Based on the observed biofilm nitrification kinetics a design philosophy is presented in relation to the diurnal variation of total ammonia production by fish. Attention is paid to: a) size of the reactor; b) required water recirculation rate; c) required total water volume; and d) expected diurnal variation of the total ammonia concentration in the fish tank.
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