Journal
BIORESOURCE TECHNOLOGY
Volume 102, Issue 2, Pages 1079-1086Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.biortech.2010.08.061
Keywords
Anaerobic digestion; Corn whole stillage; Bioethanol; Mesophilic; Thermophilic
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Anaerobic digestion of whole stillage from a dry-grind corn-based ethanol plant was evaluated by batch and continuous-flow digesters under thermophilic and mesophilic conditions. At whole corn stillage concentrations of 6348 to 50,786 mg total chemical oxygen demand (TCOD)/L, at standard temperature (0 degrees C) and pressure (1 atm), preliminary biochemical methane potential assays produced 88 +/- 8 L (49 +/- 5 L CH4) and 96 +/- 19 L (65 +/- 14 L CH4) biogas per L stillage from mesophilic and thermophilic digesters, respectively. Continuous-flow studies for the full-strength stillage (TCOD = 254 g/L) at organic loadings of 4.25, 6.30 and 9.05 g TCOD/L days indicated unstable performance for the thermophilic digester. Among the sludge retention times (SRTs) of 60,45 and 30 days tested, the mesophilic digestion was successful only at 60 days-SRT which does not represent a practical operation time for a large scale bioethanol plant. Future laboratory studies will focus on different reactor configurations to reduce the SRT needed in the digesters. (C) 2010 Elsevier Ltd. All rights reserved.
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