title: Efficient anaerobic mono-digestion of N-rich slaughterhouse waste: influence of ammonia, temperature and trace elements.
abstract: Three mono-digestion experiments treating slaughterhouse waste with high TKN concentration (∼11g/kg) were applied in lab-scale at mesophilic and psychrophilic conditions to study the impact of high ammonia concentrations and additives. Precipitation of sulphur by addition of ferrous chloride did not influence process behaviour, whereas supplementation of trace elements significantly improved process stability by reducing volatile fatty acid concentration towards zero. The limit of NH4-N concentration causing a rise of VFAs to 19,000mg/l and reduction of methane by 25% was found between 7.7 and 9.1g/kg which correspond to NH3 concentrations of 830-1060mg/l. Psychrophilic operation (25°C) lowered inhibitory NH3 concentration to 140mg/l, but process performance was stable only at low OLR of 0.4kgVS/m(3)d. Robust performance at highest possible NH4-N concentration (7.7g/kg), low VFA accumulation and satisfying methane yield of about 280Nm(3)/t COD was observed at OLR of 2.5kgVS/m(3)d at 37°C.
authors.affiliation: Bioenergy 2020+, Konrad Lorenz Str. 20, A-3430 Tulln, Austria; University of Natural Resources and Life Sciences, IFA Tulln, Institute for Environmental Biotechnology, Konrad Lorenz-Str. 20, A-3430 Tulln, Austria. Electronic address: markus.ortner@bioenergy2020.eu.
authors.forename: Markus
authors.initials: M
authors.lastname: Ortner
authors.affiliation: University of Natural Resources and Life Sciences, IFA Tulln, Institute for Environmental Biotechnology, Konrad Lorenz-Str. 20, A-3430 Tulln, Austria. Electronic address: kerstin.leitzinger@boku.ac.at.
authors.forename: Kerstin
authors.initials: K
authors.lastname: Leitzinger
authors.affiliation: University of Natural Resources and Life Sciences, IFA Tulln, Institute for Environmental Biotechnology, Konrad Lorenz-Str. 20, A-3430 Tulln, Austria. Electronic address: soeren.skupien@boku.ac.at.
authors.forename: Sören
authors.initials: S
authors.lastname: Skupien
authors.affiliation: Bioenergy 2020+, Konrad Lorenz Str. 20, A-3430 Tulln, Austria. Electronic address: guenther.bochmann@bioenergy2020.eu.
authors.forename: Günther
authors.initials: G
authors.lastname: Bochmann
authors.affiliation: University of Natural Resources and Life Sciences, IFA Tulln, Institute for Environmental Biotechnology, Konrad Lorenz-Str. 20, A-3430 Tulln, Austria. Electronic address: werner.fuchs@boku.ac.at.
authors.forename: Werner
authors.initials: W
authors.lastname: Fuchs
mesh_terms: D000003:Abattoirs; D000641:Ammonia / Q000494:pharmacology*; D000693:Anaerobiosis / Q000187:drug effects; D000818:Animals; D002417:Cattle; D005296:Ferrous Compounds / Q000494:pharmacology; D006863:Hydrogen-Ion Concentration; D008697:Methane / Q000032:analysis; D009584:Nitrogen / Q000032:analysis*; D009930:Organic Chemicals / Q000032:analysis; D012037:Refuse Disposal / Q000379:methods*; D062611:Solid Waste / Q000032:analysis*; D034421:Sus scrofa; D013696:Temperature; D013997:Time Factors; D014131:Trace Elements / Q000494:pharmacology*
chemical_list: D005296:Ferrous Compounds; D009930:Organic Chemicals; D062611:Solid Waste; D014131:Trace Elements; D000641:Ammonia; D009584:Nitrogen; D008697:Methane; C029451:ferrous chloride
keywords: Ammonia inhibition; Anaerobic mono-digestion; Ferrous chloride; Slaughterhouse waste; Trace elements