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Enrichment of a solventogenic anaerobic sludge converting carbon monoxide and syngas into acids and alcohols.

Abstract：

:An anaerobic granular sludge was acclimatized to utilise CO in a continuously gas-fed stirred tank bioreactor by applying operating conditions expected to stimulate solventogenesis, i.e. the production of alcohols, and allowing to enrich for solventogenic populations. A cycle of high (6.2) and low (4.9) pH was applied in order to produce volatile fatty acids first at high pH, followed by their bioconversion into alcohols at low pH. The addition of yeast extract stimulated biomass growth, but not necessarily solventogenesis. The highest concentrations of metabolites achieved were 6.18 g/L acetic acid (30th day), 1.18 g/L butyric acid (28th day), and 0.423 g/L hexanoic acid (32nd day). Subsequently, acids were metabolized at lower pH, producing alcohols at concentrations of 11.1 g/L ethanol (43rd day), 1.8 g/L butanol (41st day) and 1.46 g/L hexanol (42nd day), confirming the successful enrichment strategy. Similarly, the enriched sludge could also convert syngas into acids and alcohols.

journal_name

Bioresour Technol

journal_title

Bioresource technology

authors

Chakraborty S,Rene ER,Lens PNL,Veiga MC,Kennes C

doi

10.1016/j.biortech.2018.10.002

subject

Has Abstract

pub_date

2019-01-01 00:00:00

pages

130-136

eissn

0960-8524

issn

1873-2976

pii

S0960-8524(18)31416-0

journal_volume

272

pub_type

杂志文章

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