title: Co-digestion of the hydromechanically separated organic fraction of municipal solid waste with sewage sludge.
abstract: This study investigates the anaerobic digestion of the hydromechanically sorted organic fraction of municipal solid wastes (HS-OFMSW) co-digested with sewage sludge (SS). Eight laboratory-scale experiments were conducted under semi-continuous conditions at 15 and 20 days of solids retention time (SRT). The biogas yield from the waste reached 309 to 315 dm(3)/kgVS and 320 to 361 dm(3)/kgVS under mesophilic and thermophilic conditions, respectively. The addition of SS to HS-OFMSW (1:1 by weight) improved the C/N balance of the mixture, and the production of biogas through anaerobic mesophilic digestion increased to 494 dm(3)/kgVS, which corresponded to 316 dm(3)CH4/kgVS. However, when SS and HS-OFMSW were treated under thermophilic conditions, methanogenesis was inhibited by volatile fatty acids and free ammonia, which concentrations reached 5744 gCH3COOH/m(3) and 1009 gNH3/m(3), respectively.
authors.affiliation: Technical University of Lodz, Institute of Fermentation Technology and Microbiology, Wólczańska 171/173, 90-924, Łódź, Poland. Electronic address: sebastian.borowski@p.lodz.pl.
authors.forename: Sebastian
authors.initials: S
authors.lastname: Borowski
mesh_terms: D056804:Biofuels / Q000032:analysis; D019149:Bioreactors; D005232:Fatty Acids, Volatile / Q000032:analysis; D006863:Hydrogen-Ion Concentration; D012722:Sewage / Q000737:chemistry*; D062611:Solid Waste; D018505:Waste Management / Q000379:methods*
chemical_list: D056804:Biofuels; D005232:Fatty Acids, Volatile; D012722:Sewage; D062611:Solid Waste
keywords: Anaerobic digestion; Biogas; Municipal solid waste; Sewage sludge