Biogas yield from Sicilian kitchen waste and cheese whey

Abstract

The aim of this study is to determine the chemical composition of kitchen waste and cheese whey, as well as the biogas yield obtained from the Anaerobic Digestion (AD) tests of these two raw materials. Since the separated waste collection is performed in the town of Marineo (Palermo), a sample of kitchen waste, different from food industry one and included in the Organic Fraction of Municipal Solid Waste (OFMSW), was collected from the mass stored at the households of this town. Moreover, a sample of cheese whey was collected in a Sicilian mini dairy plant, where sheep milk is processed. This investigation was carried out inside laboratory digesters of Aleksandras Stulginskis University (Lithuania). Total Solids (TS) resulted 15.6% in kitchen waste and 6% in cheese whey, while both the raw materials showed a high content of organic matter, 91.1% and 79.1%, respectively. The biogas yield resulted 104.6 l kg-1 from kitchen waste and 30.6 l kg-1 from cheese whey. The biogas yield from TS resulted 672.6 l kg-1 using kitchen waste and 384.7 l kg-1 using cheese whey. The biogas yield from Volatile Solids (VS) resulted 738.9 l kg-1 using kitchen waste and 410.3 l kg-1 using cheese whey.