It is a gaseous mixture mainly composed by methane, an excellent alternative fuel (60-70%), carbon dioxide (25-35%) and other gases, and derives from the anaerobic fermentation of sewages stocked in digesters.
The so obtained gas is burnt in two cogenerators that, besides supplying the necessary heat to maintain aconstant temperature of 38-42° inside the digesters, produce the electrical energy used to run the plant, corporate users and the sale in net.
To convert ecologically the organic wastes of zootechnics into reusable fertilizers, producing also energy in reliable and efficient way, allows protecting the environment avoiding the dispersion into the atmosphere of the methane originated from the decomposition of solid and liquid dejections and creating in the meantime wealth and welfare.
Through the self-consumption and the sale of energy, sewages, whose management was complicated until now also due to the severe binds imposed by the European Union (see nitrate directive), turn into anunexpected source of richness and into a way of reducing the environmental impact, as witnessed by the reduced greenhouse emissions and by the drastic decrease of nitrate load in sewages.
Just for this reason, the recent legislative provisions encourage the exploitation of the biogas produced from biomasses of vegetal origin or from animal dejections for energy purposes, recognizing a fixed all-inclusive rate of 280€/MWh.
An interesting opportunity of income integration for many zootechnical firms.