Journal
GREEN CHEMISTRY
Volume 21, Issue 6, Pages 1258-1266Publisher
ROYAL SOC CHEMISTRY
DOI: 10.1039/c8gc02909a
Keywords
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Funding
- U.S. Department of Energy (DOE)
- University of Colorado Boulder Technology Transfer Office
- DOE [DE-AC36-08GO28308]
- U.S. Department of Energy Office of Energy Efficiency and Renewable Energy Bioenergy Technologies Office
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Biorefineries valorize waste biomass to biofuels and bioproducts, but the associated wastewater treatment is costly and energy-intensive. This study demonstrates that not only the recalcitrant black liquor generated from biorefineries can be treated using a microbial electrochemical process, but also value-added materials including lignin, chemicals, and H-2 can be separated to enable resource recovery. A lab scale microbial biomass recovery cell (MBRC) was developed to treat the actual black liquor from the deacetylation and mechanical refining (DMR) process, and the results show that 60.1-73.8% of organics, 52.0-54.6% of salts, and 30.8-49.5% of lignin were removed using different operational modes. Moreover, by utilizing the unique pH gradient generated between the different reactor chambers, tailored recoveries of lignin, chemicals, and H-2 were realized for the first time. The recoveries of lignin and salts were up to 61.2 +/- 2.7% and 92.2 +/- 1.6%, respectively. Ion transfer and organic transformation were further analyzed to understand the reaction mechanisms and improve the system performance.
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