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Optimization of carbon dioxide supply in raceway reactors: influence of carbon dioxide molar fraction and gas flow rate

Optimization of carbon dioxide supply in raceway reactors: influence of carbon dioxide molar fraction and gas flow rate
Optimization of carbon dioxide supply in raceway reactors: influence of carbon dioxide molar fraction and gas flow rate
Influence of CO2 composition and gas flow rate to control pH in a pilot-scale raceway producing Scenedesmus sp. was studied. Light and temperature determined the biomass productivity whereas neither the CO2 molar fraction nor the gas flow rate used influenced it; because pH was always controlled and carbon limitation did not take place. The CO2 molar fraction and the gas flow rate influenced carbon loss in the system. At low CO2 molar fraction (2-6%) or gas flow rate (75-100 l·min-1) the carbon efficiency in the sump was higher than 95%, 85% of the injected carbon being transformed into biomass. Conversely, at high CO2 molar fraction (14%) or gas flow rate (150 l·min-1) the carbon efficiency in the sump was lower than 67%, 32% of the carbon being fixed as biomass. Analysis here reported allows the pH control to be optimized and production costs to be reduced by optimizing CO2 efficiency.
0960-8524
72-81
Duarte-Santos, T.
2fc8e1da-c3b7-4f7a-b2b3-5f77c5e59197
Mendoza Martin, Jose
0873e7e0-3194-4c73-8991-2821f9abe114
Acién Fernández, F.G.
4a8575de-884e-4ae3-869b-4a13e352d1bb
Molina, E.
fb66da60-cd71-4920-8850-371efa4b40cb
Vieira-Costa, J.A.
86bfb84e-34af-401e-afbf-296e342be797
Heaven, Sonia
f25f74b6-97bd-4a18-b33b-a63084718571
Duarte-Santos, T.
2fc8e1da-c3b7-4f7a-b2b3-5f77c5e59197
Mendoza Martin, Jose
0873e7e0-3194-4c73-8991-2821f9abe114
Acién Fernández, F.G.
4a8575de-884e-4ae3-869b-4a13e352d1bb
Molina, E.
fb66da60-cd71-4920-8850-371efa4b40cb
Vieira-Costa, J.A.
86bfb84e-34af-401e-afbf-296e342be797
Heaven, Sonia
f25f74b6-97bd-4a18-b33b-a63084718571

Duarte-Santos, T., Mendoza Martin, Jose, Acién Fernández, F.G., Molina, E., Vieira-Costa, J.A. and Heaven, Sonia (2016) Optimization of carbon dioxide supply in raceway reactors: influence of carbon dioxide molar fraction and gas flow rate. Bioresource Technology, 212, 72-81. (doi:10.1016/j.biortech.2016.04.023).

Record type: Article

Abstract

Influence of CO2 composition and gas flow rate to control pH in a pilot-scale raceway producing Scenedesmus sp. was studied. Light and temperature determined the biomass productivity whereas neither the CO2 molar fraction nor the gas flow rate used influenced it; because pH was always controlled and carbon limitation did not take place. The CO2 molar fraction and the gas flow rate influenced carbon loss in the system. At low CO2 molar fraction (2-6%) or gas flow rate (75-100 l·min-1) the carbon efficiency in the sump was higher than 95%, 85% of the injected carbon being transformed into biomass. Conversely, at high CO2 molar fraction (14%) or gas flow rate (150 l·min-1) the carbon efficiency in the sump was lower than 67%, 32% of the carbon being fixed as biomass. Analysis here reported allows the pH control to be optimized and production costs to be reduced by optimizing CO2 efficiency.

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Accepted/In Press date: 5 April 2016
Published date: 7 April 2016
Organisations: Faculty of Engineering and the Environment

Identifiers

Local EPrints ID: 397473
URI: http://eprints.soton.ac.uk/id/eprint/397473
ISSN: 0960-8524
PURE UUID: f35c6f2a-ae2a-4e42-8c6e-d5b9f54d0ea1
ORCID for Sonia Heaven: ORCID iD orcid.org/0000-0001-7798-4683

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Date deposited: 28 Jun 2016 11:05
Last modified: 15 Mar 2024 05:42

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Contributors

Author: T. Duarte-Santos
Author: Jose Mendoza Martin
Author: F.G. Acién Fernández
Author: E. Molina
Author: J.A. Vieira-Costa
Author: Sonia Heaven ORCID iD

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