title: Co-digestion of manure and industrial waste--The effects of trace element addition.
abstract: Manure is one of the most common substrates for biogas production. Manure from dairy- and swine animals are often considered to stabilize the biogas process by contributing nutrients and trace elements needed for the biogas process. In this study two lab-scale reactors were used to evaluate the effects of trace element addition during co-digestion of manure from swine- and dairy animals with industrial waste. The substrate used contained high background concentrations of both cobalt and nickel, which are considered to be the most important trace elements. In the reactor receiving additional trace elements, the volatile fatty acids (VFA) concentration was 89% lower than in the control reactor. The lower VFA concentration contributed to a more digested digestate, and thus lower methane emissions in the subsequent storage. Also, the biogas production rate increased with 24% and the biogas production yield with 10%, both as a result of the additional trace elements at high organic loading rates. All in all, even though 50% of the feedstock consisted of manure, trace element addition resulted in multiple positive effects and a more reliable process with stable and high yield.
authors: Tekniska verken i Linköping AB (public), Dept. of Biogas R&D, Box 1500, SE-581 15 Linköping, Sweden. Electronic address: erik.nordell@tekniskaverken.se.
authors: Erik
authors: E
authors: Nordell
authors: Kemira Kemi AB, Koppargatan 20, P.O. Box 902, SE-251 09 Helsingborg, Sweden.
authors: Britt
authors: B
authors: Nilsson
authors: Tekniska verken i Linköping AB (public), Dept. of Biogas R&D, Box 1500, SE-581 15 Linköping, Sweden.
authors: Sören
authors: S
authors: Nilsson Påledal
authors: Kemira Oyj, Espoo R&D Center, Luoteisrinne 2, P.O. Box 44, FI-02270 Espoo, Finland.
authors: Kaisa
authors: K
authors: Karisalmi
authors: Tekniska verken i Linköping AB (public), Dept. of Biogas R&D, Box 1500, SE-581 15 Linköping, Sweden; Department of Microbiology, Uppsala BioCenter, Swedish University of Agricultural Sciences, SE-750 07 Uppsala, Sweden.
authors: Jan
authors: J
authors: Moestedt
mesh_terms: D000818:Animals; D056804:Biofuels / Q000032:analysis*; D019149:Bioreactors; D002417:Cattle; D007220:Industrial Waste / Q000032:analysis*; D008372:Manure / Q000032:analysis*; D034421:Sus scrofa; D013548:Sweden; D014131:Trace Elements / Q000378:metabolism*
chemical_list: D056804:Biofuels; D007220:Industrial Waste; D008372:Manure; D014131:Trace Elements
keywords: Biogas; Co-digestion; Cobalt; Manure; Nickel; Trace element