Abstract
Anaerobic digestion has been widely used in recent years for the treatment of agro-industrial or municipal wastes as carbon source to obtain alternative energy sources such as methane (CH4). Great efforts are currently being made to understand this phenomenon, generally as a first approximation in batch experiments, but due to the growing need to produce more environmentally friendly fuels, it is imperative to study the process as a continuous production. Starting from a three-state model and its parametric characterization in batch experiments, this paper analyzes the effect of the variation of two parameters of the mathematical model from continuous balances: the dilution rate (D) and the substrate feeding concentration (Si). The increase in the concentration of substrate in the inflow allows a greater production of methane, while small values allow reaching the trivial solution in the system. The choice of the dilution rate can be solved as an optimization problem since the production reaches a maximum at values close to 4 d_1.
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