NOVELTY - A system (100) for producing hydrogen from Klebsiella oxytoca metabolizing an organic feed material comprises a bioreactor (10) for holding the organic feed material, and at least one colony of Klebsiella oxytoca contained within the bioreactor.    USE - For production of hydrogen from Klebsiella oxytoca metabolizing organic feed material that is an effluent from industrial production plant (claimed), for production of hydrogen in welding, in production of hydrochloric acid, in fuel cells or for combustion, and as an alternative fuel.    ADVANTAGE - The system captures the metabolic by-products of hydrogen producing microorganisms. The bioreactor provides an environment that is conducive to the production of hydrogen from Klebsiella oxytoca and restrictive to the growth of undesirable organisms including methanogens and the production of methane. The system enables the production of sustained hydrogen having 1:1 ratio of hydrogen to carbon dioxide gas and does not include any methane. The system allows hydrogen producing microorganisms within the bioreactor to metabolize the organic feed material and produce hydrogen without conversion of the hydrogen to methane by methanogens. The heater enables heating of the organic feed material to temperature of 60 - 100degreesC in order to deactivate or kill the methanogens while leaving any hydrogen producing microorganisms substantially functional. This effectively pasteurizes or sterilizes the contents of the organic feed material from active methanogens while leaving the hydrogen producing microorganisms intact, thus allowing the produced biogas to include hydrogen without subsequent conversion to methane. The substrate provides an environment for the development and multiplication of microorganisms in the bioreactor. Thus, the substrate enables microorganisms to obtain more nutrients and expend less energy than a similar microorganism floating loosely in organic feed material.    DESCRIPTION OF DRAWING(S) - The figure shows a plan of the hydrogen production system.    Bioreactor (10)    Heater (12)    Equalization tank (14)    Reservoir (16)    Pump (28)    Oxidation reduction potential sensor (32)    pH controller (34)    Hydrogen producing system. (100)