Biotransformation of furanic and phenolic compounds with hydrogen gas production in a microbial electrolysis cell [electronic resource]

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Ngôn ngữ: eng

Ký hiệu phân loại: 621.3845 Electrical, magnetic, optical, communications, computer engineering; electronics, lighting

Thông tin xuất bản: Washington, D.C. : Oak Ridge, Tenn. : United States. Dept. of Energy. Office of Energy Efficiency and Renewable Energy ; Distributed by the Office of Scientific and Technical Information, U.S. Dept. of Energy, 2015

Mô tả vật lý: Size: p. 13667-13675 : , digital, PDF file.

Bộ sưu tập: Metadata

ID: 263581

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In this study, furanic and phenolic compounds are problematic byproducts resulting from the decomposition of lignocellulosic biomass during biofuel production. This study assessed the capacity of a microbial electrolysis cell (MEC) to produce hydrogen gas (H
2
) using a mixture of two furanic (furfural, FF
5-hydroxymethyl furfural, HMF) and three phenolic (syringic acid, SA
vanillic acid, VA
and 4-hydroxybenzoic acid, HBA) compounds as the sole carbon and energy source in the bioanode. The rate and extent of biotransformation of the five compounds, efficiency of H
2
production, as well as the anode microbial community structure were investigated. The five compounds were completely transformed within 7-day batch runs and their biotransformation rate increased with increasing initial concentration. At an initial concentration of 1,200 mg/L (8.7 mM) of the mixture of the five compounds, their biotransformation rate ranged from 0.85 to 2.34 mM/d. The anode coulombic efficiency was 44-69%, which is comparable to wastewater-fed MECs. The H
2
yield varied from 0.26 to 0.42 g H
2
-COD/g COD removed in the anode, and the bioanode volume-normalized H
2
production rate was 0.07-0.1 L/L-d. The major identified fermentation products that did not transform further were catechol and phenol. Acetate was the direct substrate for exoelectrogenesis. Current and H
2
production were inhibited at an initial substrate concentration of 1,200 mg/L, resulting in acetate accumulation at a much higher level than that measured in other batch runs conducted with a lower initial concentration of the five compounds. The anode microbial community consisted of exoelectrogens, putative degraders of the five compounds, and syntrophic partners of exoelectrogens. The H
2
production route demonstrated in this study has proven to be an alternative to the currently used process of reforming natural gas to supply H
2
needed to upgrade bio-oils to stable hydrocarbon fuels.

1. 08 hydrogen
2. 09 biomass fuels
3. Bioelectrochemical systems
4. Hydrogen
5. Microbial electrolysis

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