Modeling of photosynthesis and respiration rate for microalgae–bacteria consortia

In this article, the influence of culture conditions (irradiance, temperature, pH, and dissolved oxygen) on the photosynthesis and the respiration rates of microalgae–bacteria consortia in wastewater treatment was analyzed. Specifically, some short photo-respirometric experiments, simulating outdoor...

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Main Authors: Sanchez-Zurano, Ana, Gomez-Serrano, Cintia, Acién Fernández, Francisco Gabriel, Fernández-Sevilla, Jose María, Molina-Grima, Emilio
Format: info:eu-repo/semantics/article
Language:English
Published: 2021
Online Access:http://hdl.handle.net/10835/11717
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author Sanchez-Zurano, Ana
Gomez-Serrano, Cintia
Acién Fernández, Francisco Gabriel
Fernández-Sevilla, Jose María
Molina-Grima, Emilio
author_facet Sanchez-Zurano, Ana
Gomez-Serrano, Cintia
Acién Fernández, Francisco Gabriel
Fernández-Sevilla, Jose María
Molina-Grima, Emilio
author_sort Sanchez-Zurano, Ana
collection DSpace
description In this article, the influence of culture conditions (irradiance, temperature, pH, and dissolved oxygen) on the photosynthesis and the respiration rates of microalgae–bacteria consortia in wastewater treatment was analyzed. Specifically, some short photo-respirometric experiments, simulating outdoor raceway reactors, were performed to evaluate the response of microalgae, heterotrophic bacteria, and nitrifying bacteria to variations in environmental parameters. Results demonstrate that irradiance is the most dominant variable to determine microalgae photosynthesis rates. However, reduction in microalgae activity was not observed at higher irradiance, ruling out the existence of photoinhibition phenomena. Related to heterotrophic and nitrifying bacteria, their activities were strongly affected by the influence of temperature and pH. Moreover, the effect of dissolved oxygen concentrations on microalgae, and bacteria activities was studied, displaying a reduced photosynthetic rate at dissolved oxygen concentrations above 20 mg/L. Data have been used to develop an integrated model for each population (microalgae, heterotrophic bacteria, and nitrifying bacteria) based on considering the simultaneous influence of irradiance, temperature, pH, and dissolved oxygen. The models fit the experimental results in the range of culture conditions tested, and they were validated using data obtained by the simultaneous modifications of the variables. These individual models serve as a basis for developing a global biologic microalgae–bacteria model for wastewater treatment to improve the optimal design and management of microalgae-based processes, especially outdoors, where the cultures are subject to variable daily culture conditions.
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spelling oai:repositorio.ual.es:10835-117172023-10-10T09:50:49Z Modeling of photosynthesis and respiration rate for microalgae–bacteria consortia Sanchez-Zurano, Ana Gomez-Serrano, Cintia Acién Fernández, Francisco Gabriel Fernández-Sevilla, Jose María Molina-Grima, Emilio In this article, the influence of culture conditions (irradiance, temperature, pH, and dissolved oxygen) on the photosynthesis and the respiration rates of microalgae–bacteria consortia in wastewater treatment was analyzed. Specifically, some short photo-respirometric experiments, simulating outdoor raceway reactors, were performed to evaluate the response of microalgae, heterotrophic bacteria, and nitrifying bacteria to variations in environmental parameters. Results demonstrate that irradiance is the most dominant variable to determine microalgae photosynthesis rates. However, reduction in microalgae activity was not observed at higher irradiance, ruling out the existence of photoinhibition phenomena. Related to heterotrophic and nitrifying bacteria, their activities were strongly affected by the influence of temperature and pH. Moreover, the effect of dissolved oxygen concentrations on microalgae, and bacteria activities was studied, displaying a reduced photosynthetic rate at dissolved oxygen concentrations above 20 mg/L. Data have been used to develop an integrated model for each population (microalgae, heterotrophic bacteria, and nitrifying bacteria) based on considering the simultaneous influence of irradiance, temperature, pH, and dissolved oxygen. The models fit the experimental results in the range of culture conditions tested, and they were validated using data obtained by the simultaneous modifications of the variables. These individual models serve as a basis for developing a global biologic microalgae–bacteria model for wastewater treatment to improve the optimal design and management of microalgae-based processes, especially outdoors, where the cultures are subject to variable daily culture conditions. 2021-07-06T08:12:03Z 2021-07-06T08:12:03Z 2020-11-12 info:eu-repo/semantics/article http://hdl.handle.net/10835/11717 en https://doi.org/10.1002/bit.27625 eu-repo/grantAgreement/ES/MINECO/2016SABANA/ES/Sustainable Algae Biorefinery for Agriculture aNd Aquaculture/SABANA/727874 Attribution-NonCommercial-NoDerivatives 4.0 Internacional http://creativecommons.org/licenses/by-nc-nd/4.0/ info:eu-repo/semantics/openAccess
spellingShingle Sanchez-Zurano, Ana
Gomez-Serrano, Cintia
Acién Fernández, Francisco Gabriel
Fernández-Sevilla, Jose María
Molina-Grima, Emilio
Modeling of photosynthesis and respiration rate for microalgae–bacteria consortia
title Modeling of photosynthesis and respiration rate for microalgae–bacteria consortia
title_full Modeling of photosynthesis and respiration rate for microalgae–bacteria consortia
title_fullStr Modeling of photosynthesis and respiration rate for microalgae–bacteria consortia
title_full_unstemmed Modeling of photosynthesis and respiration rate for microalgae–bacteria consortia
title_short Modeling of photosynthesis and respiration rate for microalgae–bacteria consortia
title_sort modeling of photosynthesis and respiration rate for microalgae–bacteria consortia
url http://hdl.handle.net/10835/11717
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