Author/Authors :
Rahman، A. نويسنده Department of Civil & Environmental Engineering, The George Washington University, 2121 Eye Street, NW, Washington, DC 20052 , , Riffat، R. نويسنده , , Okogi، S. نويسنده DC Water, 5000 Overlook Avenue, SW, Washington, DC 20032 , , Takacs، I. نويسنده Dynamita SARL, 7 Eoupe, 26110, Nyons, France , , Al-Omari، A. نويسنده DC Water, 5000 Overlook Avenue, SW, Washington, DC 20032 , , Murthy، S. نويسنده DC Water, 5000 Overlook Avenue, SW, Washington, DC 20032 ,
Abstract :
The stoichiometric parameter namely “Yield Coefficient” associated with growth of certain
organism can be determined by direct measurement and/or calculated indirectly. The focus of this paper was on
the anoxic yield of heterotrophic organisms using ethanol as an external carbon source during the denitrification
process. In the literature, it was observed that yield coefficients can vary for the same substrate, which can be
referred to the relative acclimation to the substrate. The aim of this study was to evaluate the yields determined
through various catabolic and anabolic estimations. This paper presents ten different yield coefficient calculation
methods under anoxic conditions in a sequencing batch reactor using ethanol as an external substrate. The range
of anoxic yield using different calculation methods was between 0.423±0.014 to 0.512±0.021 mgCOD/mgCOD
at 20?C. It was concluded that there was no statistically significant difference between the yield values
calculated from the different methods. Depending of what parameters can be measured correctly for a particular
experiment or setup, a particular method can be selected using those parameters to calculate the yield.
