title: Recovery of biogas as a source of renewable energy from ice-cream production residues and wastewater.
abstract: Proper management of waste streams and residues from agro-industry is very important to prevent environmental pollution. In particular, the anaerobic co-digestion process can be used as an important tool for safe disposal and energy recovery from agro-industry waste streams and residues. The primary objective of this laboratory-scale study was to determine whether it was possible to recover energy (biogas) from ice-cream production residues and wastewater, through a mesophilic anaerobic co-digestion process. A high methane yield of 0.338 L CH4/gCOD(removed) could be achieved from anaerobic digestion of ice-cream wastewater alone, with almost 70% of methane in biogas, while anaerobic digestion of ice-cream production residue alone did not seem feasible. When wastewater and ice-cream production residue were anaerobically co-digested at a ratio of 9:1 by weight, the highest methane yield of 0.131 L CH4/gCOD(removed) was observed. Buffering capacity seemed to be imperative in energy recovery from these substrates in the anaerobic digestion process.
authors.affiliation: Institute of Environmental Sciences, Bogazici University, Istanbul, Turkey. burak.demirel@boun.edu.tr
authors.forename: Burak
authors.initials: B
authors.lastname: Demirel
authors.affiliation: Institute of Environmental Sciences, Bogazici University, Istanbul, Turkey.
authors.forename: Murat
authors.initials: M
authors.lastname: Orok
authors.affiliation: Institute of Environmental Sciences, Bogazici University, Istanbul, Turkey.
authors.forename: Elif
authors.initials: E
authors.lastname: Hot
authors.affiliation: Institute of Environmental Sciences, Bogazici University, Istanbul, Turkey.
authors.forename: Selin
authors.initials: S
authors.lastname: Erkişi
authors.affiliation: Unilever, Regional Environmental Manager AAR, Istanbul, Turkey.
authors.forename: Metin
authors.initials: M
authors.lastname: Albükrek
authors.affiliation: Institute of Environmental Sciences, Bogazici University, Istanbul, Turkey.
authors.forename: Turgut T
authors.initials: TT
authors.lastname: Onay
mesh_terms: D000693:Anaerobiosis; D056804:Biofuels; D019149:Bioreactors; D019649:Food Industry / Q000379:methods*; D007054:Ice Cream; D007220:Industrial Waste; D008697:Methane / Q000032:analysis / Q000378:metabolism; D014865:Waste Disposal, Fluid / Q000379:methods*; D062065:Wastewater / Q000737:chemistry*
chemical_list: D056804:Biofuels; D007220:Industrial Waste; D008697:Methane; D062065:Wastewater