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In wastewater treatment, waste removal and biomass activity are important processes which need to be monitored for a good process control. The difficulties in the interpretation of the total COD, BOD and VSS measurements encouraged the development of respirometric methods for assessing the kinetic constants. Respirometry is an important technique in assessing biological reaction in wastewater treatment.K  L   a    $${K_L}a$$   , depends on endogenous oxygen uptake rate (OURend), is a key constant in evaluating  respirogram-specific parameters . Generally, OURend is assumed constant in the dissolved oxygen equations. However, it is not the case. Consequently, this paper deals with the influence of OURend calculations region onK  L   a    $${K_L}a$$    determination, exogenous oxygen uptake rate (OURexo), total oxygen consumption and heterotrophic yield ( Y  H ). It was shown that the value of OURend andK  L   a    $${K_L}a$$    varied considerably, a maximum of 56%, depending on where to consider  C  fin , on the oxygen concentration variation curve. Even though, the variation on OURend andK  L   a    $${K_L}a$$    is important its influence on  Y o/ x  and  Y  H  is attenuated to 7.5% and 6%, respectively. This may be due to the local nature of the first parameters (OURend andK  L   a    $${K_L}a$$   ) and the global nature of the later ones. Moreover, this can be seen through the variation of the calculated amount of oxygen consumed (QT hete ) which is of the order 7.6%.

international journal of chemical reactor engineering

Influence of Endogenous OUR Determination on the         K  L   a    $${K_L}a$$   , Exogenous OUR, Total Oxygen Consumption and Heterotrophic Yield in a Completely Mixed Batch Reactor