The Italian countryside is characterized by many small farms, spread in the territory, which constitute a great potential of renewable energy. However renewable chains require large investments to ensure economic stability and technical feasibility of the same. The following study aims to analyze technical and economic feasibility of micro-anaerobic digestion plants for small farms. Discontinuous charged digestion, commonly called batch, is characterized by a single feeding of the organic substrate in the reaction chamber, perfectly sealed, able to make the anaerobic conditions. The matter is ejected only at the end of fermentation process, when all the organic potential has been transformed into biogas. This technology is characterized by simplified features, with the possibility of setting up more digestion chambers, loaded with different types of biomass typically seasonal, then biogas will be valorized by an energy conversion system. The Biomass Research Centre, on loan from the Ministry of Agriculture and Forestry, inside the project ERAARZ (Renewable Energy for Farms derived from Zootechnical Slurry), is developing in Umbria an innovative batch prototype plant with a nominal electricity power rating of about 50 kW. Chamber for biomass digestion will be undertaken using a machine for bagging corn in plastic bags, filled with a mix of different biomasses and zoo-technical slurry. The anaerobic processes activation will be improved through slurry spreading by valves at the top of the chamber. An hydraulic pump recycles at the top the slurry, after its heating made by heat produced into the energy conversion system, ensure the optimal conditions for bacterial growth inside the bio-cell. Continuous monitoring of biogas will enable data collection that will be used to reach for the better working conditions and better system performance. This plant, thanks to the lack of mechanization and push for lower costs, can be a solution also for developing countries.
Biocells for biogas production: anaerobic plant for the energetic enhancement of biomasses and zootechnical slurry
GIRALDI, DANIELE;PETROZZI, ALESSANDRO;
2011
Abstract
The Italian countryside is characterized by many small farms, spread in the territory, which constitute a great potential of renewable energy. However renewable chains require large investments to ensure economic stability and technical feasibility of the same. The following study aims to analyze technical and economic feasibility of micro-anaerobic digestion plants for small farms. Discontinuous charged digestion, commonly called batch, is characterized by a single feeding of the organic substrate in the reaction chamber, perfectly sealed, able to make the anaerobic conditions. The matter is ejected only at the end of fermentation process, when all the organic potential has been transformed into biogas. This technology is characterized by simplified features, with the possibility of setting up more digestion chambers, loaded with different types of biomass typically seasonal, then biogas will be valorized by an energy conversion system. The Biomass Research Centre, on loan from the Ministry of Agriculture and Forestry, inside the project ERAARZ (Renewable Energy for Farms derived from Zootechnical Slurry), is developing in Umbria an innovative batch prototype plant with a nominal electricity power rating of about 50 kW. Chamber for biomass digestion will be undertaken using a machine for bagging corn in plastic bags, filled with a mix of different biomasses and zoo-technical slurry. The anaerobic processes activation will be improved through slurry spreading by valves at the top of the chamber. An hydraulic pump recycles at the top the slurry, after its heating made by heat produced into the energy conversion system, ensure the optimal conditions for bacterial growth inside the bio-cell. Continuous monitoring of biogas will enable data collection that will be used to reach for the better working conditions and better system performance. This plant, thanks to the lack of mechanization and push for lower costs, can be a solution also for developing countries.I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.
