title: Feasibility of anaerobic digestion from bioethanol fermentation residue.
abstract: The focus of this study was the reuse of red algal ethanol fermentation residue as feedstock for anaerobic digestion. Levulinic acid and formic acid, the dilute-acid hydrolysis byproducts, inhibited methanogenesis at concentrations over 3.0 and 0.5 g/L, respectively. However, the inhibition was overcome by increasing inoculum concentration. A series of batch experiments with the fermentation residue showed increased methane yield and productivity at higher inoculum concentration. The maximum methane conversion rate of 84.8% was found at 5 g COD/L of fermentation residue at 0.25 g COD/g VSS of food-to-microorganism (F/M) ratio. The red algal ethanol fermentation residue can possibly be used as a feedstock in anaerobic digestion at appropriate concentration and F/M ratio.
authors.affiliation: Green Materials Technology Center, Korea Institute of Industrial Technology, 35-3 Hongcheon-ri, Ipjang-myeon, Cheonan, Chungnam 330-825, Republic of Korea.
authors.forename: Jeong-Hoon
authors.initials: JH
authors.lastname: Park
authors.forename: Sang-Hyoun
authors.initials: SH
authors.lastname: Kim
authors.forename: Hee-Deung
authors.initials: HD
authors.lastname: Park
authors.forename: Dong Jung
authors.initials: DJ
authors.lastname: Lim
authors.forename: Jeong-Jun
authors.initials: JJ
authors.lastname: Yoon
mesh_terms: D001421:Bacteria, Anaerobic / Q000378:metabolism*; D056804:Biofuels; D000431:Ethanol / Q000737:chemistry; D005240:Feasibility Studies; D005285:Fermentation; D005561:Formates / Q000737:chemistry; D007982:Levulinic Acids / Q000737:chemistry; D008697:Methane / Q000737:chemistry / Q000378:metabolism; D000461:Rhodophyta / Q000502:physiology
chemical_list: D056804:Biofuels; D005561:Formates; D007982:Levulinic Acids; C030544:formic acid; D000431:Ethanol; D008697:Methane; C032246:levulinic acid