Cogersa biomethanisation plant for segregated organic fraction and WWTP sludge in Asturias


The plant enables the management of 30,000 tonnes per year of source-segregated bio-waste

The new Cogersa (Consorcio para la Gestión de Residuos en Asturias) biomethanisation plant increases the recycling capacity of the Asturias-based consortium by enabling the management of 30,000 tonnes per year of source-segregated bio-waste, a capacity that may be doubled to up to 60,000 t in a second extension phase. The plant, located in Serín on a surface area of 38,610 m2, was built by Valoriza Servicios Medioambientales. It is equipped
with wet treatment technology supplied by German company BTA International, and a final system of composting in trenches. This enables the management of both organic matter from segregated MSW collection and wastewater sludge, to enable the production of high quality compost for subsequent commercialisation and biogas, which is channelled through the Cogersa facilities for conversion into energy.

All processes are carried out in enclosed buildings or tanks fitted with air change systems. After air is fed to the maturation building, it is sent to the cleaning system and passes through a biofilter prior to release. All excess process water is sent to the existing leachate treatment plant at the landfill.

The new biomethanisation plant required investment of €16.4 M. It will employ a staff of ten and at full capacity will produce 3,400,000 m3 of biogas per annum and 5,600 tonnes of compost. The installed capacity is 1.5 MW.