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Microbial electrochemical treatment of biorefinery black liquor and resource recovery

Abstract

Biorefineries valorize waste biomass to biofuels and bioproducts, but the associated wastewater treatment is costly and energy intensive. This study demonstrates that not only recalcitrant black liquor (BL) generated from biorefineries can be treated using microbial electrochemical process, value-added materials can be separated to enable resource recovery. Lab scale microbial biomass recovery cell (MBRC) was developed to treat actual black liquor from deacetylation and mechanical refining (DMR) process, and results show that 60.1-73.8% organics, 52.0-54.6% salts, and 30.8-49.5% lignin were removed using different operation modes. Moreover, by utilizing the unique pH gradient generated between the different reactor chambers, tailored recoveries of lignin, chemicals, and H2 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 system performance.

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Supplementary files

Publication details

The article was received on 13 Sep 2018, accepted on 30 Nov 2018 and first published on 06 Dec 2018


Article type: Paper
DOI: 10.1039/C8GC02909A
Citation: Green Chem., 2018, Accepted Manuscript
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    Microbial electrochemical treatment of biorefinery black liquor and resource recovery

    X. Chen, R. Katahira, Z. Ge, L. Lu, D. Hou, D. J. Peterson, M. P. Tucker, X. Chen and Z. J. Ren, Green Chem., 2018, Accepted Manuscript , DOI: 10.1039/C8GC02909A

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