The biohydrogen production from carbohydrate food wastes by anaerobic fermentation of digested sludge is studied. It is found that the decompounds ratio of potato, greengrocery and rice composed of hydrocarbon are respectively 45.69%, 89.2%, 30.46%. The yield of H_2 produced by dry weight per gram from potato, greengrocery and rice are respectively 82.39mL, 37.71mL, 62.63mL. The yield of methane is quite little, because the methane-producing activity is restrained and the hydrogen-producing activity is simultaneously kept when the digested sludge is preheated in the boiling water for 30 min. Ethanol is the highest volatile fatty acid in the fermentation solution when the PH is controlled around 4.5 in the process, implying that those belong to ethanol-type fermentation. In the latter term of the fermentation, the volumes of H_2 decrease with the increasing of propionic acid.
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