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Biogas Production by Anaerobic Digestion of Vegetable Matter

机译：蔬菜粪便厌氧消化生产沼气

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A mixed cellulolytic culture was employed in anaerobic digestion tests. The start-up of the semi-continuous process was rapid and, after eight days of fermentation, a specific biogas production (0.38 m exp 3 /Kg VS added) which remained constant for about two weeks, was obtained from fresh vegetable substrate. This value was 40% less than that recorded during the fermentation of pure cellulose by the same culture. The feeding of the digester with the same vegetable substrate (same chemical composition) but previously dried, showed a drop in the specific biogas production of about 45%. Therefore, this dry substrate milled into particles of small sizes and successively employed in the process caused an improvement in anaerobic digestion: the specific gas production increased about 30%. This demonstrates that the fresh vegetable biomass is more easily fermentable than the dry vegetable biomass under the same conditions of process, using substrates having the same chemical composition; a simple mechanical pretreatment causes an increase in biogas production. 17 refs., 5 figs., 7 tabs. (ERA citation 11:019402)

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