| Title | Harvesting freshwater algae with tannins from the bark of forest species: Comparison of methods and pelletization of the biomass obtained |
|---|---|
| ID_Doc | 24847 |
| Authors | Alvarez, X; Jiménez, A; Cancela, A; Valero, E; Sánchez, A |
| Title | Harvesting freshwater algae with tannins from the bark of forest species: Comparison of methods and pelletization of the biomass obtained |
| Year | 2021 |
| Published | |
| Abstract | Toxic cyanobacteria growth rates have increased in recent decades due to climate change and human activities. Microalgae, with their ability to produce a large amount of biomass, are considered as a source of energy that can be used to produce biofuels. The aim of this study is to test four different microalgae harvesting methods (sedimentation, coagulation-flocculation, pH variation, and centrifugation) in order to find which is best suited to the A Baxe reservoir, which has been suffering from cyanobacterial blooms in recent years. Centrifugation proved the most efficient method (85.74%-1790 RCF), but it can induce cell rupture. Natural sedimentation and pH variation obtained similar results at 49.36% and 49.02% respectively. Although all four methods have advantages, our results reveal that coagulation-flocculation, using 10 mg/L of Pinus pinaster, results in a removal efficiency of 68.10%, making it the most suitable method, though with 20 mg/L the performance was lower (66.03%). To minimise environmental waste, the microalgae removed were then transformed into pellets to be used as biofuel, with a higher heating value (HHV) of 21,196.96 +/- 1602.33 kJ/kg. The pellets obtained from the microalgae residue did not meet all the requirements for use as biofuels, but microalgae biomass could be mixed with other sources and therefore looks like a promising option for the future. (C) 2020 Elsevier Ltd. All rights reserved. |
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