A Case Study about Economic Sustainability of Manure Based Centralized Co-Digestion: Ribe Biogas Plant
Ribe Biogas Plant is one of the most successful manure based joint co-digestion plants in Denmark, owned by RIBE BIOGAS A/S. The owners are the farmers supplying slurry, a food processing company supplying organic waste to the plant, the regional power company and two investment companies. The aim of the biogas plant is to produce biogas for CHPgeneration and simultaneously to solve some agricultural, veterinary and environmental problems in the area, through co-digestion of animal slurry with suitable organic wastes from food industry and recycling of the resulting digestate as fertilizer.
Technical Specifications: The co-digestion plant processes yearly about 164.000 tons of biomass, consisting of 138,000 tons of livestock waste and 26,000 tons of industrial waste (maximum 25% of the feedstock mixture). The biogas plant co-digests cattle, pig, poultry and mink slurry from 62 livestock farms along with intestinal content from abattoirs, digestible fatty organic wastes from food and fish processing industries and from medicinal industry and with flotation sludge from a poultry abattoir. The digestion temperature is 53°C (thermophilic). A minimum guaranteed retention time of 4 hours at 53°C ensures efficient sanitation of digested biomass.
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