title: Anaerobic digestion for treatment of stillage from cellulosic bioethanol production.
abstract: Thermophilic anaerobic digestion of stillage from a cellulosic ethanol process that uses sugarcane bagasse as feedstock was investigated. A biochemical methane potential (BMP) of 200 ml CH4 at STP (g VS)(-1) was obtained. The whole stillage was separated into two fractions: a fraction retained on 0.5 mm screen called residue and a fraction passing through 0.5 mm screen called filtrate. About 70% of total methane yield of stillage was produced from the filtrate. The filtrate was anaerobically digested in a 15 L semi-continuously fed digester operated for 91 days at HRTs of 21 and 14 days and organic loading rate (OLR) of 1.85 and 2.39 g COD L(-1) d(-1). The methane yield from the stillage from the digester was about 90% of the yield from the BMP assays. The influent soluble COD (sCOD) was reduced from between 35.4 and 38.8 g COD (L(-1)) to between 7.5 and 8 g COD (L(-1)).
authors.affiliation: Department of Agricultural and Biological Engineering, University of Florida, Gainesville, FL 32611-0570, USA. troytian@ufl.edu
authors.forename: Zhuoli
authors.initials: Z
authors.lastname: Tian
authors.forename: Gayathri Ram
authors.initials: GR
authors.lastname: Mohan
authors.forename: Lonnie
authors.initials: L
authors.lastname: Ingram
authors.forename: Pratap
authors.initials: P
authors.lastname: Pullammanappallil
mesh_terms: D000641:Ammonia / Q000032:analysis; D000693:Anaerobiosis; D056804:Biofuels; D057919:Biological Oxygen Demand Analysis; D019149:Bioreactors; D001709:Biotechnology / Q000379:methods*; D002264:Carboxylic Acids / Q000032:analysis; D002482:Cellulose / Q000737:chemistry*; D000431:Ethanol / Q000378:metabolism*; D006863:Hydrogen-Ion Concentration; D008697:Methane / Q000032:analysis; D009584:Nitrogen / Q000032:analysis; D010710:Phosphates / Q000032:analysis; D010758:Phosphorus / Q000032:analysis; D012995:Solubility; D014835:Volatilization; D014865:Waste Disposal, Fluid; D014866:Waste Products / Q000032:analysis*
chemical_list: D056804:Biofuels; D002264:Carboxylic Acids; D010710:Phosphates; D014866:Waste Products; D010758:Phosphorus; D000431:Ethanol; D000641:Ammonia; D002482:Cellulose; C027433:bagasse; D009584:Nitrogen; D008697:Methane
keywords: Anaerobic digestion; Cellulosic ethanol; Stillage