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Electricity production from xylose in fed-batch and continuous-flow microbial fuel cells.

Abstract：

:A medium-scale (0.77 l) air-cathode, brush-anode microbial fuel cell (MFC) operated in fed-batch mode using xylose (20 mM) generated a maximum power density of 13 +/- 1 W/m(3) (673 +/- 43 mW/m(2)). Xylose was rapidly removed (83.5%) within 8 h of a 60-h cycle, with 42.1% of electrons in intermediates (8.5 +/- 0.2 mM acetate, 5.9 +/- 0.01 mM ethanol, 4.3 +/- 0.1 mM formate, and 1.3 +/- 0.03 mM propionate), 9.1% captured as electricity, 16.1% in the remaining xylose, and 32.7% lost to cell storage, biomass, and other processes. The final Coulombic efficiency was 50%. At a higher initial xylose concentration (54 mM), xylose was again rapidly removed (86.9% within 24 h of a 116-h cycle), intermediates increased in concentration (18.4 +/- 0.4 mM acetate, 7.8 +/- 0.4 mM ethanol and 2.1 +/- 0.2 mM propionate), but power was lower (5.2 +/- 0.4 W/m(3)). Power was increased by operating the reactor in continuous flow mode at a hydraulic retention time of 20 h (20 +/- 1 W/m(3)), with 66 +/- 1% chemical oxygen demand removal. These results demonstrate that electricity generation is sustained over a cycle primarily by stored substrate and intermediates formed by fermentation and that the intermediates produced vary with xylose loading.

journal_name

Appl Microbiol Biotechnol

journal_title

Applied microbiology and biotechnology

authors

Huang L,Logan BE

doi

10.1007/s00253-008-1588-x

subject

Has Abstract

pub_date

2008-09-01 00:00:00

pages

655-64

issue

4

eissn

0175-7598

issn

1432-0614

journal_volume

80

pub_type

杂志文章

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