title: Trace element supplementation in the biogas production from wheat stillage--optimization of metal dosing.
abstract: A trace element dosing strategy for the anaerobic digestion of wheat stillage was developed in this study. Mesophilic CSTR reactors were operated with the sulfuric substrate wheat stillage in some cases under trace element deficiency. After supplementing trace elements during the start-up, one of the elements of Fe, Ni, Co, Mo, and W were depleted in one digester while still augmenting the other elements to determine minimum requirements for each element. The depletion of Fe and Ni resulted in a rapid accumulation of volatile fatty acids while Co and W seem to have a long-term effect. Based on the results it was possible to reduce the dosing of trace elements, which is positive with reference to economic and environmental aspects.
authors.affiliation: Department of Biochemical Conversion, Deutsches Biomasseforschungszentrum gemeinnützige GmbH, Leipzig 04347, Germany; Faculty of Agricultural and Environmental Sciences, University of Rostock, Rostock 18059, Germany. Electronic address: thomas.schmidt@dbfz.de.
authors.forename: Thomas
authors.initials: T
authors.lastname: Schmidt
authors.affiliation: Department of Biochemical Conversion, Deutsches Biomasseforschungszentrum gemeinnützige GmbH, Leipzig 04347, Germany; Faculty of Agricultural and Environmental Sciences, University of Rostock, Rostock 18059, Germany.
authors.forename: Michael
authors.initials: M
authors.lastname: Nelles
authors.affiliation: Faculty of Agricultural and Environmental Sciences, University of Rostock, Rostock 18059, Germany.
authors.forename: Frank
authors.initials: F
authors.lastname: Scholwin
authors.affiliation: Department of Biochemical Conversion, Deutsches Biomasseforschungszentrum gemeinnützige GmbH, Leipzig 04347, Germany.
authors.forename: Jürgen
authors.initials: J
authors.lastname: Pröter
mesh_terms: D056804:Biofuels; D019149:Bioreactors; D005232:Fatty Acids, Volatile / Q000032:analysis; D006862:Hydrogen Sulfide / Q000032:analysis; D008670:Metals / Q000737:chemistry*; D008697:Methane / Q000032:analysis; D009532:Nickel / Q000032:analysis; D014131:Trace Elements / Q000737:chemistry*; D014908:Triticum / Q000737:chemistry*; D014835:Volatilization; D014866:Waste Products
chemical_list: D056804:Biofuels; D005232:Fatty Acids, Volatile; D008670:Metals; D014131:Trace Elements; D014866:Waste Products; D009532:Nickel; D008697:Methane; D006862:Hydrogen Sulfide
keywords: Anaerobic digestion; Biogas; Trace elements