title: Anaerobic digestibility of algal bioethanol residue.
abstract: The aim of this work was to investigate anaerobic digestibility of algal bioethanol residue from saccharification and fermentation processes. A series of batch anaerobic digestion tests using saccharification and fermentation residue showed that the maximum methane yields of saccharification residue and fermentation residue were 239 L/kg VS (Volatile Solids) and 283 L/kg VS (Volatile Solids), respectively. Energy recovered by anaerobic digestion of the residue was 2.24 times higher than that from the ethanol produced in the main process. 5-HMF (5-hydroxymethylfurfural), a saccharification byproduct, could retard methanogenesis at over 3g/L however, the inhibition was prevented by increasing cell biomass concentration. Anaerobic digestion of residue has the potential to enhance bioenergy recovery and environmental sustainability of algal bioethanol production.
authors.affiliation: Department of Civil, Environmental and Architectural Engineering, Korea University, Anam-Dong, Seongbuk-gu, Seoul 136-714, Republic of Korea.
authors.forename: Jeong-Hoon
authors.initials: JH
authors.lastname: Park
authors.forename: Jeong-Jun
authors.initials: JJ
authors.lastname: Yoon
authors.forename: Hee-Deung
authors.initials: HD
authors.lastname: Park
authors.forename: Dong Jung
authors.initials: DJ
authors.lastname: Lim
authors.forename: Sang-Hyoun
authors.initials: SH
authors.lastname: Kim
mesh_terms: D000693:Anaerobiosis; D018533:Biomass; D000431:Ethanol / Q000378:metabolism*; D005285:Fermentation; D012624:Seaweed / Q000378:metabolism*
chemical_list: D000431:Ethanol