Biological Hydrogen Production

There are various biological processes by which hydrogen is released or appears as an intermediate product. One can basically separate these into two process types: photosynthesis, for which light is required and fermentation, which occurs in darkness. As there is still no sign of a market in this area, a detailed description will not be given. The use of biological processes for hydrogen production is presently at the point of technical system development, whereby there also still remain many unresolved fundamental biochemical questions. At the moment an algae-bacteria-system seems to be the best candidate for the first technical application. Investigations carried out so far indicate that hydrogen production costs of 25 cent/kWh H2 or less are achievable [96].

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