[Comparison and analysis of hydrogen production capacity with different acidogenic fermentative microflora]

The biogas(hydrogen) production capacity of ethanol type and propionic acid type fermentative microflora were compared, and the movement of hydrogen production rate according to the succession of microflora from propionic acid type to ethanol type was investigated. It was demonstrated that under the same loading rate, microflora of ethanol type fermentation had relatively high hydrogen production rate and specific hydrogen production rate, maximum hydrogen production rate was 14.99 L/d, maximum specific hydrogen production rate was 3586.45 mmol/(kg.d). While, for the microflora of propionic acid type fermentation, hydrogen production rate and specific hydrogen production rate were extremely low, maximum hydrogen production rate was 3.62 L/d, maximum specific hydrogen production rate was 196.46 mmol/(kg.d). In order to obtain high yield of H2 in the fermentation process, ethanol type fermentation was preferred and propionic and type fermentation had to be avoided.