Different process routes of hydrogen-production from biomass can be broadly classified as follows:
1. Thermochemical gasification coupled with water gas shift. Maximum conversion can be achieved. But significant gas conditioning is required and removal of tars is important.
2. Fast pyrolysis followed by reforming of carbohydrate fractions of bio-oil. It produces bio-oil which is the basis of several processes for development of fuels, chemicals and materials.But therr are chances of catalyst deactivation.
3. Direct solar gasification. Good hydrogen yield but requires effective collector plates
4. Miscellaneous novel gasification process.
5. Biomass-derived syn-gas conversion.
6. Supercritical conversion of biomass.Can process sewage sludge, which is difficult to gasify. Require a selection of supercritical medium
7. Microbial conversion of biomass.Waste water can also be treated simultaneously. Also
generates some useful secondary metabolites. Selection of suitable microorganisms is needed.
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