Across the world, energy production and consumption are of utmost concern in environmental sustainability strategies. As part of the effort to alleviate worldwide energy problems, a green economy has grown rapidly. In Europe, annual energy production from 2000 to 2011 increased from 400,000 GW/h to 680,000 GW/h, of which 17% was derived from biomass and biogas. In 2011, the growth rate of electricity produced from biogas was 18.2% (EUROSTAT, 2012). In Italy, biogas energy comes from landfills (82%), municipal biogas plants (17%) and wastewater treatment plants (WWTPs) and accounts for only 1% of total electricity production (Bodik et al.,2011). Biogas production from scrap biomass reduces the environmental impact of waste disposal, in terms of organic carbon, pathogen and some toxicant reduction. Today, biogas is the most common form of energy recovered from wastewater; moreover the potential energy recovery
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