Kinetic Study on Denitrification by Paracoccus denitrificans

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Both batch and continuous culture studies have been employed to evaluate a model and kinetic parameters for the denitrification-associated cell growth of Paracoccus denitrificans. The experimental denitrification data could be accounted for by a smiple kinetic model which was based on the assumption that the denitrification occurred by consecutive reduction of nitrate to molecular nitrogen via nitrite and that the Monod equation could be applied to each reaction step. The model appears to predict that the buildup of nitrite out as an intermediate product would reach a peak in batch culture, but that nitrite concentration in continuous culture would be very low even at high dilution rate.The important kinetic parameters which determine the design criteria were evaluated from continuous culture experiments. The maximum overall rate of nitrogen gas evolution per unit volume in nitrate-limiting chemostat was higher than in nitrite-limiting chemostat due to the difference in growth rate. However, growth-yield data suggested that in the nitrite-denitrifying process the production of biomass and consumption of carbon and energy source per unit mass of nitrogen removed will be lower than in the nitrate-dentrifying process. Furthermore, lower effluent concentrations of nitrogen compounds could be obtained in the nitrite-denitrifying system, because of the lower saturation constant for nitrite reduction.The washout dilution rate was much lower under glucose-limiting chemostat than under nitrate-limiting chemostat for nitrate reduction or under nitrite-limiting chemostat for nitrite reduction. Under glucose-limiting chemostat, nitrite accumulated in the reactor over a critical dilution rate, so that the inhibitory effect of nitrite on the cell growth accelerated the washout. This results indicated that an insufficiency of carbon source would tend to destabilize the system, particularly in treatment of waste water containing high concentrations of nitrogen compounds.
社団法人日本生物工学会の論文
1978-06-25

Kinetic Study on Denitrification by Paracoccus denitrificans

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