Staff Publications

Staff Publications

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    'Staff publications' is the digital repository of Wageningen University & Research

    'Staff publications' contains references to publications authored by Wageningen University staff from 1976 onward.

    Publications authored by the staff of the Research Institutes are available from 1995 onwards.

    Full text documents are added when available. The database is updated daily and currently holds about 240,000 items, of which 72,000 in open access.

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Record number 533792
Title Controlling Ethanol Use in Chain Elongation by CO2 Loading Rate
Author(s) Roghair, M.; Hoogstad, Tim; Strik, D.P.B.T.B.; Plugge, C.M.; Timmers, P.H.A.; Weusthuis, R.A.; Bruins, M.E.; Buisman, C.J.N.
Source Environmental Science and Technology 52 (2018)3. - ISSN 0013-936X - p. 1496 - 1505.
Department(s) Sub-department of Environmental Technology
Biobased Chemistry and Technology
Microbiological Laboratory
Bioprocess Engineering
FBR Bioconversion
Publication type Refereed Article in a scientific journal
Publication year 2018
Abstract Chain elongation is an open-culture biotechnological
process which converts volatile fatty acids (VFAs) into
medium chain fatty acids (MCFAs) using ethanol and other
reduced substrates. The objective of this study was to
investigate the quantitative effect of CO2 loading rate on
ethanol usages in a chain elongation process. We supplied
different rates of CO2 to a continuously stirred anaerobic
reactor, fed with ethanol and propionate. Ethanol was used to
upgrade ethanol itself into caproate and to upgrade the
supplied VFA (propionate) into heptanoate. A high CO2
loading rate (2.5 LCO2·L−1·d−1) stimulated excessive ethanol
oxidation (EEO; up to 29%) which resulted in a high caproate production (10.8 g·L−1·d−1). A low CO2 loading rate (0.5 LCO2·
L−1·d−1) reduced EEO (16%) and caproate production (2.9 g·L−1·d−1). Heptanoate production by VFA upgrading remained
constant (∼1.8 g·L−1·d−1) at CO2 loading rates higher than or equal to 1 LCO2·L−1·d−1. CO2 was likely essential for growth of
chain elongating microorganisms while it also stimulated syntrophic ethanol oxidation. A high CO2 loading rate must be selected
to upgrade ethanol (e.g., from lignocellulosic bioethanol) into MCFAs whereas lower CO2 loading rates must be selected to
upgrade VFAs (e.g., from acidified organic residues) into MCFAs while minimizing use of costly ethanol.
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