title: Semi-continuous anaerobic digestion of different silage crops: VFAs formation, methane yield from fiber and non-fiber components and digestate composition.
abstract: This study presents the results of long-term semi-continuous experiments on anaerobic digestion at an HRT of 45d with ten silages: 2 annual and 4 perennial crops, and 4 mixtures of annual with perennial crops. The composition of substrates and digestates was determined with Van Soest's fractionation method. Removal of non-fiber materials ranged from 49.4% (Miscanthus sacchariflorus) to 89.3% (Zea mays alone and mixed with M. sacchariflorus), that of fiber materials like lignin ranged from 0.005% (Z. mays alone and mixed with grasses at VS ratio of 90:10%) to 46.5% (Sida hermaphrodita). The lowest stability of anaerobic digestion, as confirmed by normalized data concentrations of volatile fatty acids, was reported for both miscanthuses and sugar sorghum. The methane yield coefficients for non-fiber and fiber materials were 0.3666 and 0.2556L/g, respectively. All digestate residues had high fertilizing value, especially those from mixtures of crops.
authors.affiliation: Faculty of Environmental Sciences, Department of Environmental Biotechnology, University of Warmia and Mazury in Olsztyn, Sloneczna St. 45G, 10-719 Olsztyn, Poland. Electronic address: tomasz.pokoj@uwm.edu.pl.
authors.forename: T
authors.initials: T
authors.lastname: Pokój
authors.affiliation: Faculty of Environmental Sciences, Department of Environmental Biotechnology, University of Warmia and Mazury in Olsztyn, Sloneczna St. 45G, 10-719 Olsztyn, Poland.
authors.forename: K
authors.initials: K
authors.lastname: Bułkowska
authors.affiliation: Faculty of Environmental Sciences, Department of Environmental Biotechnology, University of Warmia and Mazury in Olsztyn, Sloneczna St. 45G, 10-719 Olsztyn, Poland.
authors.forename: Z M
authors.initials: ZM
authors.lastname: Gusiatin
authors.affiliation: Faculty of Environmental Sciences, Department of Environmental Biotechnology, University of Warmia and Mazury in Olsztyn, Sloneczna St. 45G, 10-719 Olsztyn, Poland.
authors.forename: E
authors.initials: E
authors.lastname: Klimiuk
authors.affiliation: Faculty of Environmental Management and Agriculture, Department of Agrotechnology, Agricultural Production Management and Agribusiness, University of Warmia and Mazury in Olsztyn, M. Oczapowskiego St. 8, 10-719 Olsztyn, Poland.
authors.forename: K J
authors.initials: KJ
authors.lastname: Jankowski
mesh_terms: D000693:Anaerobiosis / Q000502:physiology; D000818:Animals; D002417:Cattle; D004043:Dietary Fiber; D005232:Fatty Acids, Volatile / Q000096:biosynthesis* / Q000302:isolation & purification; D008372:Manure / Q000382:microbiology*; D008697:Methane / Q000302:isolation & purification / Q000378:metabolism*; D035261:Plant Components, Aerial / Q000382:microbiology*; D012820:Silage / Q000382:microbiology*
chemical_list: D004043:Dietary Fiber; D005232:Fatty Acids, Volatile; D008372:Manure; D008697:Methane
keywords: Crop silages; Digestate fertility; Fiber and non-fiber removal; Methane yield coefficient