Continuous anaerobic fermentation of organic waste to produce bio gas

摘要

The organic material, of human, animal and/or vegetable origin is fed into a closed container after sprinkling with a substrate and put into circulation inside the container. The gas produced is collected and the degraded prods. removed, with re-introduction of bio-gas into the mass entering the container. EPAB- EP-192900 B Method of carrying out a degradation in an anaerobic medium, for instance a methanogenesis, of organic products, by-products or waste of human, animal and/or vegetable origin consisting of feeding the said products to be degraded into a closed vessel after having possibly seeded said products with a suitable substrate, imposing upon the said products a direction of circulation within the said vessel recovering the gas produced called biogas evolved above the said body of products and discharging the degraded products, with an intermittent re-introduction of the biogas as jets from the bottom of the vessel into the mass of products present within the vessel, characterised in that one virtually subdivides the said vessel into a plurality of sectors so that the density of products corresponding to each one of the sectors, respectively, varies in the direction of circulation of the products within the said vessel and in that one injects produced biogas into each sector successively in a time-shifted manner and under a pressure and for a period of time which are predetermined, selectively adjustable in each sector in accordance with the density of the products in the associated sector with a view to perform a satisfactory fluidising of the products. USAB- US4824571 A A method of methanogenesis of organic prods. by-prods. and human waste, animal waste and vegetable matter supplies feed to a closed fermentation vessel and circulating them from an inlet to an outlet. Gas is evolved and collected and the degraded prods. are discharged with a reintroduction of biogas into the mass of prods. present from the bottom of the vessel to fluidise them. - The vessel is subdivided into different prod. density sectors juxtaposed in the direction of circulation and biogas is injected into each st set time duration and pressure. The pressure and time are selected in accordance with the prod. density in each sector.