Simulation of anaerobic biodegradation process in a tubular bioreactor with a biofilm layer: Steady-state and unsteady-state conditions
Saman Malekahmadi, Amirhossein Yousefnezhadazizi, Hossein Askaripour
TL;DR
The paper simulates anaerobic biodegradation in a tubular bioreactor with a biofilm layer under steady and unsteady conditions, analyzing how reactor parameters affect performance.
Contribution
The study introduces a simulation framework for anaerobic biodegradation in tubular bioreactors with biofilm under varying operational conditions.
Findings
Reducing bioreactor diameter increases substrate conversion in liquid and lowers biofilm substrate concentration.
Increased liquid residence time slightly reduces biofilm substrate concentration while boosting conversion.
A proportional-integral controller with parameters KP=−0.131 and KI=0.02 regulates substrate conversion effectively within 120 seconds.
Abstract
In this paper, anaerobic biodegradation process in a tubular bioreactor with an inner biofilm layer for steady-state and unsteady-state conditions are simulated. The effects of various parameters including bioreactor diameter, fraction of active biomass transferred to liquid phase, and residence time of the liquid on bioreactor performance are examined. Simulations indicate that decreasing diameter of bioreactor leads to increasing degree of conversion of the substrate in liquid phase and decreasing dimensionless concentration of the substrate in biofilm. With an increase in the fraction of active biomass transferred to liquid, substrate concentrations in liquid and biofilm slightly vary. Increased residence time of the liquid phase results in the degree of conversion of substrate goes up, but substrate concentration in biofilm lowers a little. In addition, it is found that biomass…
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Taxonomy
TopicsFluid Dynamics and Mixing · Minerals Flotation and Separation Techniques · Wastewater Treatment and Nitrogen Removal