PURPOSE: To provide a method for producing hydrogen with a microorganism by which a high hydrogen yield closer to a theoretically obtained amount is obtained without producing lactic or formic acid.
CONSTITUTION: An organic substrate previously regulated so as to make lactic acid or a mixture thereof with formic acid present in an amount corresponding to 10-30%, expressed in terms of carbon and based on the fed organic substrate is used as the organic substrate in a method for fermenting an organic substrate and producing hydrogen. The organic substrate is preferably used by regulating the pH to neutral by adding an alkaline agent thereto.
EBARA RES CO LTD
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