Abstract
This study describes the influence of an animal food additive (dimetridazole) on the methanization of swine manure. The results from batch digesters show that, depending on dimetridazole concentration, activation or inhibition of the anaerobic digestion process occurs. The presence of dimetridazole favours Volatile Acid production. Up to a concentration of 710 μmol litre −1, in the case of a steady-state digester, there was an increase in methane production. At higher concentrations, an accumulation of propionic acid, rather than acetic acid, was observed and this resulted in inhibition of the process.
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