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Lactate and ethanol as intermediates in 2 phase anaerobic digestion


, : Lactate and ethanol as intermediates in 2 phase anaerobic digestion. Biotechnology & Bioengineering 23(5): 1145-1154

The thermodynamics of the various anaerobic digestion patterns of hexose to methane are compared. It appears that by directing the hexose-hydrolysis phase towards ethanol and lactic acid production, methanogenesis can be enhanced because the syntrophic bacteria are allocated more potentially available energy. This hypothesis was confirmed in a series of laboratory test runs. They revealed that lactic acid and ethanol as intermediates, in comparison to lower volatile fatty acids, give rise to a considerably higher effluent quality and a slightly larger biogas production.

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