Abstract
Synthetic microbial consortium (SynCONS) based bioprocessing integrated with pyrolysis is successfully demonstrated as an advance in our quest to convert cellulose to valuables. Comparative metabolic analysis of multiple microbes allowed robust design of SynCONS aimed at consolidated bioprocessing of cellulose to ethanol and lactate. The microbial partners of Trichoderma reesei - Parageobacillus thermoglucosidasius (fungal-bacterial) and Thermobifida fusca - P. thermoglucosidasius (bacterial-bacterial, thermophilic) showed promising cellulose degradation and total yields of 9 % and 23 % respectively. Further, higher ethanol yields were achieved in thermophilic SynCONS using engineered fermentative partner P. thermoglucosidasius TM242 (33 %) or pure cellulases for saccharification (51 %). Finally, pyrolyzing the residual cellulose and microbial biomass resulted in carbon material with desirable physicochemical properties as revealed by Scanning Electron Microscopy, X-ray Diffraction and Raman spectroscopy. Overall, the integration of SynCONS bioprocessing with pyrolysis confirmed a promising strategy for conversion of cellulose to chemicals, biofuels, and carbon suitable for several industrial applications.
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