Abstract
Kinetic studies on nitrification were performed to examine oxygen demand caused by oxidation of inorganic nitrogen. Kinetic parameters for the progress of nitrogen were determined from an N-BOD curve by modifying Lee's graphical method. Nitrification is defined as two distinct stages representing the oxidation of ammonium and nitrite. If the processes of the respective oxidation reactions are expressed as first order kinetics, a mathematical model of the progress of N-BOD can be expressed by using composite two first order kinetics. The rate constants in the first and second steps are 0.17-0.18/day and 0.19/day, respectively. Accordingly, it is considered that nitrification is a sluggish biochemical reaction. The N-BOD curve calculated from the sum of two first order kinetics agrees well with the observed data. The agreement between the theoretical oxygen demand calculated from a stoichiometric equation and experimental ultimate oxygen demand obtained from kinetic analysis is excellent for reactions in the first and second steps.
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