Kinetic constants of nitrification

A modified respirometric method for measuring the kinetic constants rx,m and Ks, of the first stage of nitrification was developed and verified. The method has the following advantages; the duration of measurement is significantly decreased compared with the original method and rx can be determined at relatively high concentrations of substrate. The effect of substrate and activated sludge composition (COD:NH4+-N ratio, fraction of nitrifiers) on respirometric methods application is discussed.