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Harvesting microalgae using ozone-air flotation for recovery of biomass, lipids, carbohydrates, and proteins

Lookup NU author(s): Dr Sharon Velasquez Orta

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This is the authors' accepted manuscript of an article that has been published in its final definitive form by Taylor and Francis Ltd, 2020.

For re-use rights please refer to the publisher's terms and conditions.


Abstract

© 2020, © 2020 Informa UK Limited, trading as Taylor & Francis Group. The objective of this research was to study a novel ozone-air flotation microalgae harvesting method and evaluate its effect on the recovery of biomass and biocomponents (lipids, carbohydrates, proteins). Best processing conditions were established using a response surface methodology (RSM). Microalgae separation and biocomponent recovery were evaluated according to changes in gas concentration (13, 18 and 25 mgO3/L), ozone dose (0.04, 0.09 and 0.16 mg O3/mg biomass) and airflow rate (0.5, 1.0 and 1.5 L/min). More than 95% of the biomass was recovered from wastewater at an ozone-air combination of 0.09 mgO3/mg biomass and 1.5 L air/min. Using ozone-air represented a reduction of 59% in the ozone dose compared to the flotation process solely using ozone (0.22 mgO3/mg biomass). In addition, there was an improved yield in the recovery of all microalgae biocomponents. A maximum yield of 0.18 mg lipids/mg biomass was achieved at: 0.16 mg O3/mg biomass, 25 mg gas O3/L and 1.5 L air/min. In conclusion, combining the use of ozone-air for separation of microalgae reduces ozone requirement and enhances lipids and proteins post-extraction.


Publication metadata

Author(s): Valeriano Gonzalez MT, Orta Ledesma MT, Velasquez-Orta SB, Monje Ramirez I

Publication type: Article

Publication status: Published

Journal: Environmental Technology

Year: 2020

Issue: ePub ahead of Print

Online publication date: 28/02/2020

Acceptance date: 28/01/2020

Date deposited: 26/10/2020

ISSN (print): 0959-3330

ISSN (electronic): 1479-487X

Publisher: Taylor and Francis Ltd

URL: https://doi.org/10.1080/09593330.2020.1725144

DOI: 10.1080/09593330.2020.1725144

PubMed id: 32109198


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Funding

Funder referenceFunder name
220704

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