Effect of pH Change on the Microalgae-Based Biogas Upgrading Process
| Primer Autor |
Torres-Aravena, Alvaro
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| Co-autores |
Meier, Leslie
Vilchez, Carlos
Cuaresma, Maria
Jeison, David
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| Título |
Effect of pH Change on the Microalgae-Based Biogas Upgrading Process
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| Editorial |
MDPI
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| Revista |
APPLIED SCIENCES-BASEL
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| Lenguaje |
en
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| Resumen |
An alternative way to remove CO2 from biogas is the use of photosynthetic microorganisms, such as microalgae. This can be achieved by the operation of an open photobioreactor, connected with a mass transfer column, such as a counterflow column. This technology provides up-graded biogas with high quality. The microalgal uptake of CO2 from the biogas in counterflow columns generates pH changes in microalgae culture. To clarify the potential effect of these dynamic pH conditions in the culture, the effect of pH change on the photosynthetic activity and PSII quantum yield was studied for microalgae Chlorella sorokiniana. Thus, assays were carried out, where the pH drop reported in the counterflow columns was replicated in batch microalgae culture through HCl addition and CO2 injection, moving the culture pH from 7.0 to 5.0 and from 7.0 to 5.8, respectively. Moreover, the effect of light/darkness on photosynthetic activity was tested when the pH decreased. The results obtained in this research showed that the photosynthetic activity decreased for the light conditions when the pH was shifted by HCl addition and CO2 injection. Despite this, the value of the PSII quantum yield remained at 0.6-0.7, which means that the microalgae culture did not suffer a negative effect on the photosynthetic system of cells because a high value of PSII efficiency remained. In the same way, the results indicated that when the pH change was corrected, the photosynthetic activity recovered. Moreover, the apparent affinity constant for dissolved inorganic carbon (KDIC) was 0.9 mu M at pH 5 and 112.0 mu M at pH 7, which suggests that the preferred carbon source for C.sorokniana is CO2. Finally, all the results obtained indicated that the pH drop in the counter-flow column for biogas upgrading did not cause permanent damage to the photosynthetic system, and the decrease in the photosynthetic activity as a result of the pH drop can be recovered when the pH is corrected.
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| Tipo de Recurso |
artículo original
|
| Description |
This research was funded by FONDECYT-ANID CHILE, grant number 1120488, CRHIAM Centre (CONICYT/FONDAP) grant number 15130015, and VRIEA-PUCV grant number 039.315/2022.
Esta investigación fue financiada por FONDECYT-ANID CHILE, beca número 1120488, beca Centro CRHIAM (CONICYT/FONDAP) número 15130015 y beca VRIEA-PUCV número 039.315/2022.
|
| doi |
10.3390/app122312194
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| Formato Recurso |
PDF
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| Palabras Claves |
biogas upgrading
microalgae
carbon sequestration
pH
INORGANIC CARBON
BIOMASS
GROWTH
PHOTOSYNTHESIS
PERFORMANCE
ANHYDRASE
RATIO
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| Ubicación del archivo | |
| Categoría OCDE |
Química Multidisciplinaria
Ingeniería Multidisciplinaria
Ciencia de Materiales
Multidisciplinaria
Física Aplicada
|
| Materias |
mejora de biogás
microalgas
secuestro de carbono
pH
CARBONO INORGÁNICO
BIOMASA
CRECIMIENTO
FOTOSÍNTESIS
RENDIMIENTO
ANHIDRASA
RATIO
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| Título de la cita (Recomendado-único) |
Effect of pH Change on the Microalgae-Based Biogas Upgrading Process
|
| Identificador del recurso (Mandatado-único) |
artículo original
|
| Versión del recurso (Recomendado-único) |
version publicada
|
| License |
CC BY 4.0
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| Condición de la licencia (Recomendado-repetible) |
CC BY 4.0
|
| Derechos de acceso |
acceso abierto
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| Access Rights |
acceso abierto
|
| Referencia del Financiador (Mandatado si es aplicable-repetible) |
ANID-FONDECYT 15130015
PUCV 039.315/2022
CONICYT-FONDAP 15130015
ANID FONDECYT 15130015
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| Id de Web of Science |
WOS:000895522600001
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cienciaabierta.ufro.cl
ciencia.abierta@ufrontera.cl