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  • changes in dominant fermentation type during anaerobic digestion of high-loading glycerol with slight glucose content

    جزئیات بیشتر مقاله
    • تاریخ ارائه: 1390/01/01
    • تاریخ انتشار در تی پی بین: 1390/01/01
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     high-loading glycerol containing slight amounts of five different monosaccharides was inoculated with seed sludge obtained from a methane fermentation reactor. the use of different monosaccharides as fermentation promoters resulted in changes in fermentation types; in particular, glucose induced the formation of 1,3-propanediol. after 9 days incubation with glucose, glycerol levels had fallen by 81%, while molar yields of organic acids and 1,3-propanediol (per mole of glycerol degraded) were 0.22 and 0.39, respectively. other monosaccharides enhanced methane production after 14 days of incubation in the following order: galactose, galacturonic acid, mannose and arabinose. hydrogen was generated (together with a negligible amount of methane) only in the presence of glucose. when glucose was introduced to a methane-producing reactor (promoted by galacturonic acid), hydrogen production began 5 days later and displaced the methane production after 12 days. these results suggest that glucose catalyzes glycerol degradation, resulting in the production of hydrogen.

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