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Efficient hydrogen gas production from cassava and food waste by a two-step process of dark fermentation and photo-fermentation
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A two-step process of sequential anaerobic (dark) and photo-heterotrophic fermentation was employed to produce hydrogen from cassava and food waste. In dark fermentation, the average yield of hydrogen was approximately 199 ml H2 g1 cassava and 220 ml H2 g1 food waste. In subsequent photo-fermentation, the average yield of hydrogen from the effluent of dark fermentation was approximately 611 ml H2 g1 cassava and 451 ml H2 g1 food waste. The total hydrogen yield in the two-step process was estimated as 810 ml H2 g1 cassava and 671 ml H2 g1 food waste. Meanwhile, the COD decreased greatly with a removal efficiency of 84.3% in cassava batch and 80.2% in food waste batch. These results demonstrate that cassava and food waste could be ideal substrates for bio-hydrogen production. And a two-step process combining dark fermentation and photo-fermentation was highly improving both bio-hydrogen production and removal of substrates and fatty acids.
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 Record created 2010-04-06, last modified 2019-06-28

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