Title: Two-phase anaerobic digestion of solid organic wastes yielding biogas and compost. Final report
Abstract: The aim of the project was to develop a novel, specific process for the anaerobic digestion of solid organic wastes with biogas and compost as the final products. The developed process can, in respect to the requirements and the judgements of today, be an alternative to (controlled) dumping and to incineration of organic wastes; the process also is an alternative for (aerobic) composting. In the novel process the solid matter is charged into a liquefaction acidification reactor (R1), where the material is broken down by an anaerobic microflora into soluble compounds, mainly volatile fatty acids (VFA), which are continuously leached by percolating water. The percolate is pumped to a digester (R2), containing a sludge or granules of methane bacteria, where the dissolved organic matter is converted into biogas, while the treated water is recycled to the R1. The microbiological and technological aspects of this process have been investigated on laboratory scale, in semi technical apparatus and finally in a pilot plant (reactor volume 300 m/sup 3/), where two different conceptions to the R1 have been tested at about 33/sup 0/C (mesophilic). A great variety of organic waste materials was tested, like sugarbeet pulp, onion wastes, waste from sugarbeet and potato processing factories waste tomato plants, straw and organic fractions separated from municipal solid waste. The residues, after anaerobic digestion, were submitted to an (aerobic) after-composting; after a spontaneous initial heating, a compost equal to a usual compost was obtained. The results of the investigation are reported and a technological discussion and a feasibility study are given.
Publication Year: 1985
Publication Date: 1985-01-01
Language: en
Type: article
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Cited By Count: 2
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