Some implications of natural increase of pH in microalgae cultivation and harvest by autoflocculation

ABSTRACT Microalgae hold great potential for producing purified high-value products (e.g. pigments and polyunsaturated fatty acids) and represent a source of bioavailable nutrients in aquaculture feeds; however, its production is limited by the high costs of harvesting. Recently, microalgae autofloc...

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Autores principales:	Beltrán-Rocha,Julio César, Guajardo-Barbosa,Claudio, Rodríguez-Fuentes,Humberto, Reyna-Martínez,Gustavo Raúl, Osornio-Berthet,Luis, García-Martínez,Magdalena, Quintal,Icela Dagmar-Barceló, López-Chuken,Ulrico Javier
Lenguaje:	English
Publicado:	Pontificia Universidad Católica de Valparaíso. Facultad de Recursos Naturales. Escuela de Ciencias del Mar 2021
Materias:	algal culturing harvesting nutrient solution composition pH-induced flocculation dewatering microalgae
Acceso en línea:	http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0718-560X2021000500836
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spelling	oai:scielo:S0718-560X20210005008362021-11-25Some implications of natural increase of pH in microalgae cultivation and harvest by autoflocculationBeltrán-Rocha,Julio CésarGuajardo-Barbosa,ClaudioRodríguez-Fuentes,HumbertoReyna-Martínez,Gustavo RaúlOsornio-Berthet,LuisGarcía-Martínez,MagdalenaQuintal,Icela Dagmar-BarcelóLópez-Chuken,Ulrico Javier algal culturing harvesting nutrient solution composition pH-induced flocculation dewatering microalgae ABSTRACT Microalgae hold great potential for producing purified high-value products (e.g. pigments and polyunsaturated fatty acids) and represent a source of bioavailable nutrients in aquaculture feeds; however, its production is limited by the high costs of harvesting. Recently, microalgae autoflocculation has been considered a useful solution due to the easy recovery of cell aggregates and natural increase in pH that prevents cell lysis. This work evaluates some cultivation conditions that could contribute to autoflocculation, such as natural pH increase and precipitate formation over the productivity and flocculation of 16 microalgae consortia. Results showed a biomass production of 1.4 to 4.4 dry weight (g L-1) and high flocculation of 81 to ~100%, probably due to Ca3(PO4)2 formation. Moreover, the alkaline pH could have facilitated the assimilation of CO2 and explained the increase of inorganic carbon in the solution obtained. Likewise, results showed a marked descent in electrical conductivity (EC) in solution and high mineral content in the biomass (21.4-35.9%). Finally, this study suggests that the studied culture conditions facilitated microalgae harvest, and the resulting biomass could be a source of bioavailable dietary minerals. Therefore, some of these results might be addressed in future studies with individual microalgae species.info:eu-repo/semantics/openAccessPontificia Universidad Católica de Valparaíso. Facultad de Recursos Naturales. Escuela de Ciencias del MarLatin american journal of aquatic research v.49 n.5 20212021-11-01text/htmlhttp://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0718-560X2021000500836en10.3856/vol49-issue5-fulltext-2691
institution	Scielo Chile
collection	Scielo Chile
language	English
topic	algal culturing harvesting nutrient solution composition pH-induced flocculation dewatering microalgae
spellingShingle	algal culturing harvesting nutrient solution composition pH-induced flocculation dewatering microalgae Beltrán-Rocha,Julio César Guajardo-Barbosa,Claudio Rodríguez-Fuentes,Humberto Reyna-Martínez,Gustavo Raúl Osornio-Berthet,Luis García-Martínez,Magdalena Quintal,Icela Dagmar-Barceló López-Chuken,Ulrico Javier Some implications of natural increase of pH in microalgae cultivation and harvest by autoflocculation
description	ABSTRACT Microalgae hold great potential for producing purified high-value products (e.g. pigments and polyunsaturated fatty acids) and represent a source of bioavailable nutrients in aquaculture feeds; however, its production is limited by the high costs of harvesting. Recently, microalgae autoflocculation has been considered a useful solution due to the easy recovery of cell aggregates and natural increase in pH that prevents cell lysis. This work evaluates some cultivation conditions that could contribute to autoflocculation, such as natural pH increase and precipitate formation over the productivity and flocculation of 16 microalgae consortia. Results showed a biomass production of 1.4 to 4.4 dry weight (g L-1) and high flocculation of 81 to ~100%, probably due to Ca3(PO4)2 formation. Moreover, the alkaline pH could have facilitated the assimilation of CO2 and explained the increase of inorganic carbon in the solution obtained. Likewise, results showed a marked descent in electrical conductivity (EC) in solution and high mineral content in the biomass (21.4-35.9%). Finally, this study suggests that the studied culture conditions facilitated microalgae harvest, and the resulting biomass could be a source of bioavailable dietary minerals. Therefore, some of these results might be addressed in future studies with individual microalgae species.
author	Beltrán-Rocha,Julio César Guajardo-Barbosa,Claudio Rodríguez-Fuentes,Humberto Reyna-Martínez,Gustavo Raúl Osornio-Berthet,Luis García-Martínez,Magdalena Quintal,Icela Dagmar-Barceló López-Chuken,Ulrico Javier
author_facet	Beltrán-Rocha,Julio César Guajardo-Barbosa,Claudio Rodríguez-Fuentes,Humberto Reyna-Martínez,Gustavo Raúl Osornio-Berthet,Luis García-Martínez,Magdalena Quintal,Icela Dagmar-Barceló López-Chuken,Ulrico Javier
author_sort	Beltrán-Rocha,Julio César
title	Some implications of natural increase of pH in microalgae cultivation and harvest by autoflocculation
title_short	Some implications of natural increase of pH in microalgae cultivation and harvest by autoflocculation
title_full	Some implications of natural increase of pH in microalgae cultivation and harvest by autoflocculation
title_fullStr	Some implications of natural increase of pH in microalgae cultivation and harvest by autoflocculation
title_full_unstemmed	Some implications of natural increase of pH in microalgae cultivation and harvest by autoflocculation
title_sort	some implications of natural increase of ph in microalgae cultivation and harvest by autoflocculation
publisher	Pontificia Universidad Católica de Valparaíso. Facultad de Recursos Naturales. Escuela de Ciencias del Mar
publishDate	2021
url	http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0718-560X2021000500836
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Some implications of natural increase of pH in microalgae cultivation and harvest by autoflocculation

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