title: Winery waste recycling through anaerobic co-digestion with waste activated sludge.
abstract: In this study biogas and high quality digestate were recovered from winery waste (wine lees) through anaerobic co-digestion with waste activated sludge both in mesophilic and thermophilic conditions. The two conditions studied showed similar yields (0.40 m(3)/kgCODfed) but different biological process stability: in fact the mesophilic process was clearly more stable than the thermophilic one in terms of bioprocess parameters. The resulting digestates showed good characteristics for both the tested conditions: heavy metals, dioxins (PCDD/F), and dioxin like bi-phenyls (PCBs) were concentred in the effluent if compared with the influent because of the important reduction of the solid dry matter, but remained at levels acceptable for agricultural reuse. Pathogens in digestate decreased. Best reductions were observed in thermophilic condition, while at 37°C the concentration of Escherichia coli was at concentrations level as high as 1000 UFC/g. Dewatering properties of digestates were evaluated by means of the capillary suction time (CST) and specific resistance to filtration (SRF) tests and it was found that a good dewatering level was achievable only when high doses of polymer (more than 25 g per kg dry solids) were added to sludge.
authors.affiliation: Department of Environmental Sciences, Informatics and Statistics, University Ca' Foscari of Venice, Calle Larga Santa Marta, 30123 Venice, Italy. Electronic address: cinzia.daros@unive.it.
authors.forename: C
authors.initials: C
authors.lastname: Da Ros
authors.affiliation: Department of Environmental Sciences, Informatics and Statistics, University Ca' Foscari of Venice, Calle Larga Santa Marta, 30123 Venice, Italy. Electronic address: cavinato@unive.it.
authors.forename: C
authors.initials: C
authors.lastname: Cavinato
authors.affiliation: Department of Environmental Sciences, Informatics and Statistics, University Ca' Foscari of Venice, Calle Larga Santa Marta, 30123 Venice, Italy. Electronic address: pavan@unive.it.
authors.forename: P
authors.initials: P
authors.lastname: Pavan
authors.affiliation: Department of Biotechnology, University of Verona, Strada le Grazie 15, 37134 Verona, Italy; Interuniversity National Consortium "Chemistry for the Environment", Via delle Industrie, 21/8, 30175 Venice, Italy. Electronic address: david.bolzonella@univr.it.
authors.forename: D
authors.initials: D
authors.lastname: Bolzonella
mesh_terms: D000693:Anaerobiosis; D056804:Biofuels / Q000032:analysis; D019149:Bioreactors; D005374:Filtration; D007220:Industrial Waste / Q000032:analysis*; D010865:Pilot Projects; D059027:Recycling / Q000379:methods*; D012722:Sewage / Q000032:analysis*; D014865:Waste Disposal, Fluid / Q000379:methods*; D014920:Wine
chemical_list: D056804:Biofuels; D007220:Industrial Waste; D012722:Sewage
keywords: Anaerobic co-digestion; Dewaterability; Heavy metals; Organic pollutants; Pathogens