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Evaluation of the influence of CO2 on hydrogen production by Caldicellulosiruptor saccharolyticus

Willquist, Karin LU ; Claassen, Pieternel A. M. and van Niel, Ed LU (2009) In International Journal of Hydrogen Energy 34(11). p.4718-4726
Abstract
Stripping gas is generally used to improve hydrogen yields in fermentations. Since CO2 is relatively easy to separate from hydrogen it could be an interesting stripping gas. However, a higher partial CO2 pressure is accompanied with an increased CO2 uptake in the liquid, where it hydrolyses and induces an increased requirement of NaOH to maintain the pH. This enhances the osmotic pressure in the culture by 30%, which inhibited the growth of Caldicellulosiruptor saccharolyticus. indications for this conclusion are: i) inhibition could almost completely be circumvented by reducing the bicarbonate through decreasing the pH (from 6.5 to 5.5), ii) Growth rates were reduced by 60 +/- 10% at an osmotic pressure of 0.218 +/- 0.005 osm/kg H2O... (More)
Stripping gas is generally used to improve hydrogen yields in fermentations. Since CO2 is relatively easy to separate from hydrogen it could be an interesting stripping gas. However, a higher partial CO2 pressure is accompanied with an increased CO2 uptake in the liquid, where it hydrolyses and induces an increased requirement of NaOH to maintain the pH. This enhances the osmotic pressure in the culture by 30%, which inhibited the growth of Caldicellulosiruptor saccharolyticus. indications for this conclusion are: i) inhibition could almost completely be circumvented by reducing the bicarbonate through decreasing the pH (from 6.5 to 5.5), ii) Growth rates were reduced by 60 +/- 10% at an osmotic pressure of 0.218 +/- 0.005 osm/kg H2O independently of the stripping gas, iii) Increased extracellular DNA and protein concentrations were observed as a function of the osmotic pressure. In addition to growth inhibition, the increased sodium bicarbonate in the effluent will contribute to a negative environmental impact when applied at industrial scale. (C) 2009 International Association for Hydrogen Energy. Published by Elsevier Ltd. All lights reserved. (Less)
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author
organization
publishing date
type
Contribution to journal
publication status
published
subject
keywords
Biohydrogen production, Osmotic pressure, CO2, Stripping gas, Caldicellulosiruptor saccharolyticus
in
International Journal of Hydrogen Energy
volume
34
issue
11
pages
4718 - 4726
publisher
Elsevier
external identifiers
  • wos:000267562100004
  • scopus:66949114725
ISSN
1879-3487
DOI
10.1016/j.ijhydene.2009.03.056
language
English
LU publication?
yes
id
7c3c3b02-dcfd-479d-9857-4860924f4e59 (old id 1463166)
date added to LUP
2009-08-18 14:17:48
date last changed
2017-01-08 04:38:15
@article{7c3c3b02-dcfd-479d-9857-4860924f4e59,
  abstract     = {Stripping gas is generally used to improve hydrogen yields in fermentations. Since CO2 is relatively easy to separate from hydrogen it could be an interesting stripping gas. However, a higher partial CO2 pressure is accompanied with an increased CO2 uptake in the liquid, where it hydrolyses and induces an increased requirement of NaOH to maintain the pH. This enhances the osmotic pressure in the culture by 30%, which inhibited the growth of Caldicellulosiruptor saccharolyticus. indications for this conclusion are: i) inhibition could almost completely be circumvented by reducing the bicarbonate through decreasing the pH (from 6.5 to 5.5), ii) Growth rates were reduced by 60 +/- 10% at an osmotic pressure of 0.218 +/- 0.005 osm/kg H2O independently of the stripping gas, iii) Increased extracellular DNA and protein concentrations were observed as a function of the osmotic pressure. In addition to growth inhibition, the increased sodium bicarbonate in the effluent will contribute to a negative environmental impact when applied at industrial scale. (C) 2009 International Association for Hydrogen Energy. Published by Elsevier Ltd. All lights reserved.},
  author       = {Willquist, Karin and Claassen, Pieternel A. M. and van Niel, Ed},
  issn         = {1879-3487},
  keyword      = {Biohydrogen production,Osmotic pressure,CO2,Stripping gas,Caldicellulosiruptor saccharolyticus},
  language     = {eng},
  number       = {11},
  pages        = {4718--4726},
  publisher    = {Elsevier},
  series       = {International Journal of Hydrogen Energy},
  title        = {Evaluation of the influence of CO2 on hydrogen production by Caldicellulosiruptor saccharolyticus},
  url          = {http://dx.doi.org/10.1016/j.ijhydene.2009.03.056},
  volume       = {34},
  year         = {2009},
}