Respirometric assessment of storage yield for different substrates

Abstract

A new procedure has been defined for the respirometric assessment of bacterial storage yield as defined in the Activated Sludge Model No.3. The procedure was used to determine the storage yield, Y(STO), associated with acetate, glucose and domestic sewage, together with mixtures of acetate/glucose and acetate/domestic sewage at different initial F/M ratios. Y(STO) was calculated as 0.78 gCOD(gCOD)(-1) for acetate, 0.87 gCOD(gCOD)(-1) for glucose and 0.96 gCOD(gCOD)(-1) for domestic sewage. The Y(STO) of substrate mixtures was found to reflect the characteristics of the dominant fraction in the mixture.

Sequential batch membrane bio-reactor for wastewater treatment: The effect of increased salinity

“…Table 3 reports the averages obtained for the stoichiometric/kinetic parameters during the experiment. Referring to the heterotrophic biomass, it is worth noting that the salinity increase did not cause a significant stress effect, with the main kinetic/stoichiometric parameters being in good agreement with the data available in the literature (Karahan-Gül et al, 2002;Hauduc et al, 2011;Mannina et al, 2011;Mannina and Viviani, 2010). Only a slight decrease in the heterotrophic yield coefficient (Y H ) and the maximum heterotrophic growth rate (l H,max ) were observed during the experiment.…”

“…3a, which shows a typical respirogram obtained for the heterotrophic species. The storage yield coefficient Y STO was evaluated from the procedure proposed by Karahan-Gül et al (2002). For the autotrophic species, we observed a higher stress effect due to the salinity, with a significant reduction in the respiration rates (from 8.85…”

Assessment of Biological Kinetics in a Conventional Municipal WWTP by Means of the Oxygen Uptake Rate Method

“…The observed heterotrophic cellular yield coefficient, Y H,obs , can be defined by means of Equation (2) defined by Gujer et al [22]: (3) and (4), as defined by Karahan-Gül et al [23]:…”

Carbon and nutrient biological removal in a University of Cape Town membrane bioreactor: Analysis of a pilot plant operated under two different C/N ratios

“…These peculiar conditions likely enhanced the growth of bacterial groups able to rapidly convert the organic substrate into storage products. The storage yield coefficient (Y STO ) was evaluated according to the procedure proposed by Karahan-Gül et al [35].…”