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Anaerobic mixed‐culture fermentation of aqueous ammonia‐treated sugarcane bagasse in consolidated bioprocessing

The MixAlco process is an example of consolidated bioprocessing (CBP) in which anaerobic mixed‐culture fermentation biochemically converts any biodegradable feedstock into carboxylate salts. Downstream processing thermochemically transforms the resulting salts into mixed alcohol fuels or gasoline. To enhance digestibility, sugarcane bagasse was treated under mild conditions (55°C, 24 h, and 30% aqueous ammonia solution with a loading of 10 mL/g dry biomass). Using NH4HCO3 buffer, the feedstock (80% ammonia‐treated sugarcane bagasse/20% chicken manure) was anaerobically fermented by a mixed culture of marine microorganisms at 55°C. Four‐stage countercurrent fermentations were performed at various volatile solids loading rates (VSLRs) and liquid residence times (LRTs). The highest acid productivity (1.14 g/(L day)) occurred at a total acid concentration of 29.8 g/L. The highest conversion (65%) occurred at a total acid concentration of 27.6 g/L. The continuum particle distribution model (CPDM) predicted the experimental total acid concentrations and conversions within 4.98% and 10.41%, respectively. When using NH4HCO3 buffer, ammonia pretreatment is an attractive option. The CPDM “map” shows that both high volatile solid conversions (78.8%) and high acid concentrations (32.6 g/L) are possible with 300 g/(L liquid) substrate concentration, 30 days LRT, 2 g/(L day) solid loading rate and NH4HCO3 buffer. Biotechnol. Bioeng. 2010;106: 216–227. © 2010 Wiley Periodicals, Inc.