Abstract
Knowledge of the biokinetic parameters of heterotrophic biofilm is important for reliable modeling and optimization of biofilm wastewater treatment systems. In this article, an approach to quantify heterotrophic biokinetic parameters, including the maximum specific oxygen uptake rate (
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), the Monod half saturation coefficient of oxygen (ko), and the maintenance decay coefficient for oxygen (Km) in wastewater biofilms, was presented and evaluated. With the oxygen microprofiles measured in the biofilm by using the oxygen microelectrode, the heterotrophic biokinetic parameters were determined through fitting the data to the diffusion-reaction models. The biomass used in the model was represented in terms of the average volatile suspended solids (VSS) measured by weight and the spatial distribution of VSS by phospholipid analysis. Results showed that with an addition of an external substrate at a concentration of 2000 mg COD/L into biofilms, oxygen became the growth limiting factor. The biokinetic parameters derived from the average VSS possessed the smaller
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compared with the layered VSS. However, the heterogeneity of biomass has a slight impact on the ko and Km. Sensitivity analyse showed that the proposed model was a good
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estimator.
