| 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 |
|
| DOI |
10.1016/j.chemosphere.2020.129313 |
| 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. |
| Author Keywords |
Harvesting; Centrifugation; Coagulation-flocculation; Pellet production; Zero residue; Circular economy |
| Index Keywords |
Index Keywords |
| Document Type |
Other |
| Open Access |
Open Access |
| Source |
Science Citation Index Expanded (SCI-EXPANDED) |
| EID |
WOS:000615571300097 |
| WoS Category |
Environmental Sciences |
| Research Area |
Environmental Sciences & Ecology |
| PDF |
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