Abstract
Single- and two-phase anaerobic digestion of vegetable solid wastes were compared at laboratory scale. Both mesophilic and thermophilic liquefaction and acidogenesis were shown to be maximal when the pH was maintained at approximately 6·5 in the reactor. The distribution and concentrations of the Volatile Fatty Acids and alcohols produced varied with the temperature, the nature of the wastes and the retention time. Methanogenic fermentation of the liquefaction products was efficiently performed in an anaerobic filter and high methane productivities were obtained. Maximal overall methane productivity was attained when the filter productivity was approximately 5 liters of methane per liter per day. Phase separation under mesophilic conditions resulted in significantly higher methane productivity than was obtained by operation in a single-stage CSTR reactor. Under thermophilic conditions, the advantage of two-phase operation was far less marked.
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