title: Anaerobic digestion of fines from recovered paper processing - Influence of fiber source, lignin and ash content on biogas potential.
abstract: Fines concentration harms paper machine runability and output quality in recovered paper processing, hence, their extraction would be fundamentally beneficial. In this study, separated fines from an industrial recycled fiber pulp (RFP) were characterized and evaluated for their potential biogas yields with a focus on understanding the role of varying lignin and ash contents. Further, these results were compared with biogas yields from conventional chemical and mechanical pulps. Overall, methane yields of fines from mechanical pulps (21-28mL/gVS) and RFP (127mL/gVS) are relatively low compared to the high methane yields of 375mL/gVS from the chemical pulp fines. However, it was shown that the high ash content in RFP fines (up to 50%) did not negatively influence overall yield, rather, it was the presence of slowly biodegrading lignin-rich fiber fines.
authors.affiliation: Chemical Wood Technology, Department of Wood Science, University of Hamburg, Leuschnerstr. 91B, 21031 Hamburg, Germany.
authors.forename: Friedrich
authors.initials: F
authors.lastname: Steffen
authors.affiliation: Chemical Engineering Department, University of Córdoba, Building Marie-Curie, Campus of Rabanales, 14071 Córdoba, Spain.
authors.forename: Ana
authors.initials: A
authors.lastname: Requejo
authors.affiliation: Department of Paper Technology and Mechanical Process Engineering, University of Darmstadt, Alexanderstr. 8, 64283 Darmstadt, Germany.
authors.forename: Christian
authors.initials: C
authors.lastname: Ewald
authors.affiliation: Chemical Wood Technology, Department of Wood Science, University of Hamburg, Leuschnerstr. 91B, 21031 Hamburg, Germany.
authors.forename: Ron
authors.initials: R
authors.lastname: Janzon
authors.affiliation: Chemical Wood Technology, Department of Wood Science, University of Hamburg, Leuschnerstr. 91B, 21031 Hamburg, Germany. Electronic address: bodo.saake@uni-hamburg.de.
authors.forename: Bodo
authors.initials: B
authors.lastname: Saake
mesh_terms: D000693:Anaerobiosis; D056804:Biofuels; D002241:Carbohydrates / Q000737:chemistry; D003460:Crystallization; D004043:Dietary Fiber; D007220:Industrial Waste; D008031:Lignin / Q000737:chemistry*; D008697:Methane / Q000737:chemistry*; D010209:Paper; D012037:Refuse Disposal / Q000379:methods*; D012722:Sewage; D013696:Temperature
chemical_list: D056804:Biofuels; D002241:Carbohydrates; D004043:Dietary Fiber; D007220:Industrial Waste; D012722:Sewage; D008031:Lignin; D008697:Methane
keywords: Biochemical methane potential (BMP); Chemical pulp; Fines; Mechanical pulp; Recycled fiber