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Photosynthetically oxygenated salicylate biodegradation in a continuous stirred tank photobioreactor

Munoz, Raul LU ; Köllner, Claudia; Guieysse, Benoit LU and Mattiasson, Bo LU (2004) In Biotechnology and Bioengineering 87(6). p.797-803
Abstract
A consortium consisting of a Chlorella sorokiniana strain and a Ralstonia basilensis strain was able to carry out sodium salicylate biodegradation in a continuous stirred tank reactor (CSTR) using exclusively photosynthetic oxygenation. Salicylate biodegradation depended on algal activity, which itself was a function of microalgal concentration, light intensity, and temperature. Biomass recirculation improved the photobioreactor performance by up to 44% but the results showed the existence of an optimal biomass concentration above which dark respiration started to occur and the process efficiency started to decline. The salicylate removal efficiency increased by a factor of 3 when illumination was increased from 50 - 300 muE/M-2 (.)s. In... (More)
A consortium consisting of a Chlorella sorokiniana strain and a Ralstonia basilensis strain was able to carry out sodium salicylate biodegradation in a continuous stirred tank reactor (CSTR) using exclusively photosynthetic oxygenation. Salicylate biodegradation depended on algal activity, which itself was a function of microalgal concentration, light intensity, and temperature. Biomass recirculation improved the photobioreactor performance by up to 44% but the results showed the existence of an optimal biomass concentration above which dark respiration started to occur and the process efficiency started to decline. The salicylate removal efficiency increased by a factor of 3 when illumination was increased from 50 - 300 muE/M-2 (.)s. In addition, the removal rate of sodium salicylate was shown to be temperature-dependent, increasing from 14 to 27 mg/l(.)h when the temperature was raised from 26.5 to 31.5degreesC. Under optimized conditions (300 muE/m(2) (.)s, 30degreesC, 1 g sodium salicylate/l in the feed and biomass recirculation) sodium salicylate was removed at a maximum constant rate of 87 mg/l.h, corresponding to an estimated oxygenation capacity of 77 mg O-2/l(.)h (based on a BOD value of 0.88 g O-2/g sodium salicylate for the tested bacterium), which is in the range of the oxygen transfer capacity of large-scale mechanical surface aerators. Thus, although higher degradation rates were attained in the control reactor, the photobioreactor is a cost-efficient process which reduces the cost of aeration and prevents volatilization problems associated with the degradation of toxic volatile organic compounds under aerobic conditions. (C) 2004 Wiley Periodicals, Inc. (Less)
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author
organization
publishing date
type
Contribution to journal
publication status
published
subject
in
Biotechnology and Bioengineering
volume
87
issue
6
pages
797 - 803
publisher
John Wiley & Sons
external identifiers
  • pmid:15329938
  • wos:000223632800012
  • scopus:4644266113
ISSN
1097-0290
DOI
10.1002/bit.20204
language
English
LU publication?
yes
id
479b55f4-bb9b-4463-b579-dc12513ab891 (old id 140587)
date added to LUP
2007-07-02 14:08:38
date last changed
2017-10-22 03:36:43
@article{479b55f4-bb9b-4463-b579-dc12513ab891,
  abstract     = {A consortium consisting of a Chlorella sorokiniana strain and a Ralstonia basilensis strain was able to carry out sodium salicylate biodegradation in a continuous stirred tank reactor (CSTR) using exclusively photosynthetic oxygenation. Salicylate biodegradation depended on algal activity, which itself was a function of microalgal concentration, light intensity, and temperature. Biomass recirculation improved the photobioreactor performance by up to 44% but the results showed the existence of an optimal biomass concentration above which dark respiration started to occur and the process efficiency started to decline. The salicylate removal efficiency increased by a factor of 3 when illumination was increased from 50 - 300 muE/M-2 (.)s. In addition, the removal rate of sodium salicylate was shown to be temperature-dependent, increasing from 14 to 27 mg/l(.)h when the temperature was raised from 26.5 to 31.5degreesC. Under optimized conditions (300 muE/m(2) (.)s, 30degreesC, 1 g sodium salicylate/l in the feed and biomass recirculation) sodium salicylate was removed at a maximum constant rate of 87 mg/l.h, corresponding to an estimated oxygenation capacity of 77 mg O-2/l(.)h (based on a BOD value of 0.88 g O-2/g sodium salicylate for the tested bacterium), which is in the range of the oxygen transfer capacity of large-scale mechanical surface aerators. Thus, although higher degradation rates were attained in the control reactor, the photobioreactor is a cost-efficient process which reduces the cost of aeration and prevents volatilization problems associated with the degradation of toxic volatile organic compounds under aerobic conditions. (C) 2004 Wiley Periodicals, Inc.},
  author       = {Munoz, Raul and Köllner, Claudia and Guieysse, Benoit and Mattiasson, Bo},
  issn         = {1097-0290},
  language     = {eng},
  number       = {6},
  pages        = {797--803},
  publisher    = {John Wiley & Sons},
  series       = {Biotechnology and Bioengineering},
  title        = {Photosynthetically oxygenated salicylate biodegradation in a continuous stirred tank photobioreactor},
  url          = {http://dx.doi.org/10.1002/bit.20204},
  volume       = {87},
  year         = {2004},
}