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Lookup NU author(s): Dr Sharon Velasquez OrtaORCiD
This work is licensed under a Creative Commons Attribution 4.0 International License (CC BY 4.0).
© 2024 Elsevier LtdThere is a bottleneck in recovery microalgae biomass from cultivations to recovery bioenergy the low metabolites yields achieved still lacks low operating cost. Optimization of the harvesting process such as coagulation-flocculation is crucial to find the conditions of a chemical compound for biomass and metabolites recovery and suitable or easy assimilation by microorganism for biohydrogen production. Dose, pH, flocculation velocity, flocculation and settling times are relevant factors that influence over biomass and metabolites recovery and define the requirements of the harvesting process in terms of invested energy. The aim of this study is to get the efficiency of biomass and biomolecules separation by using the response surface methodology for three chemical compounds such as ferric chloride, aluminum sulfate and chitosan. The design presented recovery efficiencies highest as 99 % for all the coagulants. A selection of coagulant conditions yields augmentation a carbohydrates content subsequently transformed to biohydrogen. The mix of microalgae and chitosan presented high carbohydrates increase or a low effect on carbohydrates determination in comparison to those harvested using other flocculants, where the microalgae biomass was washed because of precipitates formation. The biohydrogen produced from untreated harvested microalgae biomass with chitosan was of 1.958 ± 0.2 mmol/L using isolated indigenous yeast Candida sp. by using the chitosan concentration to recovery the maximum biomass concentration (0.02 g/L), was of 2.4 ± 0.1 mmol/L of H2. Under these conditions, the energy reduction was from 0.15 kWh/m3 to 1.2 kWh/m3, 35 % to >80 % less in comparison with other flocculants applied. In this context, the findings demonstrated that applying an organic flocculant for microalgae harvesting even lacking high biomass and carbohydrates yields, the biomass can be enriched and improved leading for a sustainable and direct route to produce a potential biofuel.
Author(s): Suastes-Rivas JK, Romero-Pineda MJ, Monje-Ramirez I, Velasquez-Orta SB, Velasco A, Orta-Ledesma MT
Publication type: Article
Publication status: Published
Journal: Energy Conversion and Management
Year: 2024
Volume: 302
Online publication date: 15/02/2024
Acceptance date: 08/01/2024
Date deposited: 27/02/2024
ISSN (print): 0196-8904
ISSN (electronic): 1879-2227
Publisher: Elsevier Ltd
URL: https://doi.org/10.1016/j.enconman.2024.118081
DOI: 10.1016/j.enconman.2024.118081
ePrints DOI: 10.57711/10jz-gb14
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