Mathematical Simulation of Anaerobic Stratified Biofilm Processes
A modified stratified anaerobic biofilm model has been developed. The model represents anaerobic digestion by a simplified two population distributed ecosystem. The model was built to examine the benefits that stratification can bestow on the stability and overall dynamic response of the system. Computation was carried out using the orthogonal collocation method.
Dynamic simulation was used to show that stratified biofilm populations can withstand the effects caused by organic overloading, inhibition and intermittent loading and that the time taken for the VFA concentration to reach the steady state is mainly affected by the rate of glucose conversion to VFA.
Under certain conditions the model predicted that a sustained oscillation phenomenon would be especially marked in the methanogenic bacterial layer.
KeywordsAnaerobic Digestion Volatile Fatty Acid Collocation Point Glucose Conversion Volatile Fatty Acid Concentration
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