Journal
BIOMASS & BIOENERGY
Volume 151, Issue -, Pages -Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.biombioe.2021.106165
Keywords
Carboxylate platform; Mixed-culture anaerobic fermentation; Anion-exchange resins; Cellulose; Product inhibition; Volatile fatty acid extraction
Funding
- Artie McFerrin Department of Chemical Engineering at Texas AM University
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By utilizing methane-arrested mixed cultures, organic substrates were fermented to mixed carboxylic acids at higher yields, and the product rate was increased through the use of ion-exchange resins and other methods. The results suggest that further improvements in the MixAlco (R) process configurations have great potential.
Using methane-arrested mixed cultures, organic substrates can be fermented to mixed carboxylic acids (i.e., C2 to C8 volatile fatty acids) via the carboxylate platform. A commercial example, the MixAlco (R) process recovers the carboxylic acids and transforms them to chemicals and fuels. To reduce product inhibition, ion-exchange resin (IR) fermentors used weak-base anion-exchange resins (Amberlite IRA-67) to recover carboxylic acids from fermentation broth and thereby maintain near-neutral pH. Control fermentors used magnesium carbonate (MgCO3) to buffer to near-neutral pH. Compared to the control, the IR fermentors increased acid yields by 2.2, 1.54, and 1.55 times for alpha-cellulose substrate, paper substrate, and lime-pretreated corn stover, respectively. Furthermore, extraction increased yields of valuable long-chain carboxylic acids. These results suggest further improvements are possible in advanced MixAlco (R) process configurations, such as countercurrent continuous fermentations.
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