Show Context Citation Context However, this microbial diversity is usually not tracked during reactor operation andmostly neglected in present mathematical models, which distinguish at the Contents lists However, this microbial diversity is usually not tracked during reactor operation andmostly neglected in present mathematical models, which distinguish at the Contents lists availab Process Bioc Biological nitrogen removal fromwastewater can be considered as a proven technology and has been widely implemented. Ziehn, G. Reichl, E. Arnold , "
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Email: chukwuemeka. Biodegradation of n-C12, C14, C16, C18, C20 was investigated using a respirometric method and compared with the biodegradation of the readily biodegradable substrates glucose, acetic acid and ethanol. Experiments were performed in small-scale bioreactors under various conditions, i.
Under aerobic conditions all the readily biodegradable substrates and hydrocarbons were removed, although the acclimation time was longer for the hydrocarbons days than for the readily biodegradable substrates days. No significant effect on the hydrocarbon concentration on biodegradation was observed in the concentration range 0.
Under anoxic conditions, both the readily biodegradable substrates and the hydrocarbons were removed using nitrate as electron acceptor. However, the acclimation time for the hydrocarbons under anoxic conditions days was much longer than under aerobic conditions. Under both aerobic and anoxic conditions, once acclimation with the hydrocarbons was completed, the microorganisms were immediately able to remove a second spike of the substrate without acclimation.
Under anaerobic conditions, no activity was observed with the hydrocarbons over a period of days, while the mixed culture was able to remove glucose and convert it to volatile fatty acids. Under aerobic conditions, the dissolved oxygen consumption data was mathematically modelled using Monod kinetics to obtain biokinetic parameters. Good fittings between the model and the experimental data was obtained and the biodegradation of hydrocarbons was characterised by higher values of the parameter KS compared to the readily biodegradable substrates.
The results of this study showed that the open mixed microbial cultures contained diverse microorganisms capable of utilizing both liquid and solid n-alkanes under aerobic and anoxic conditions.
Activated sludge model
Jump to navigation Jump to search Activated sludge model is a generic name for a group of mathematical methods to model activated sludge systems. Activated sludge models are used in scientific research to study biological processes in hypothetical systems. They can also be applied on full scale wastewater treatment plants for optimisation, when carefully calibrated with reference data for sludge production and nutrients in the effluent. They started creating on a generalised framework for mathematical models that could be used to model activated sludge for nitrogen removal. An activated sludge model consists of: state variables: these include the different fractions of COD, biomass and different types of nutrients, both organic and inorganic a description of the dynamic processes: lists the different biological processes that are modelled, together with their formulae parameters: variables that describe the circumstances of the biological system, such as growth and decay rate, half-saturation coefficient for hydrolysis, etc.
Activated Sludge Model 3
Activated sludge models ASM1, ASM2, ASM2d and ASM3