 |
| Titel |
Freshwater and marine microalgae harvesting with magnetic microparticles |
| VerfasserIn |
Sofia Vergini, Andriana Aravantinou, Ioannis D. Manariotis |
| Konferenz |
EGU General Assembly 2014
|
| Medientyp |
Artikel
|
| Sprache |
Englisch
|
| Digitales Dokument |
PDF |
| Erschienen |
In: GRA - Volume 16 (2014) |
| Datensatznummer |
250090166
|
| Publikation (Nr.) |
 EGU/EGU2014-4385.pdf |
|
|
|
|
|
| Zusammenfassung |
| Microalgae are considered to be the most promising new source of biomass and biofuels. The
use of microalgae for sustainable biofuel production is important because of the lack of
hydrocarbons sources. Many studies have focused on the recovery of microalgae
biomass from the growth medium in order to reduce production cost. Alternative
technologies, other than conventional methods (i.e. centrifugation, coagulation-flocculation,
filtration and screening, gravity sedimentation, and flotation), capable to process large
volumes of microalgae cultures at a low cost, are essential for microalgae biomass
production.
The aim of this study was to investigate the harvesting of microalgae cells using magnetic
materials (magnetic activated carbon, magnetite microparticles) compared to common
flocculants (FeCl3-
6H2O, AlCl3, Al2(SO4)3-
18H2O), and gravity sedimentation.
Scenedesmus rubescens and Dunaliella tertiolecta were selected as representative for
freshwater and marine microalgae, respectively. The cultivation of microalgae was conducted
under continuous artificial light, in 10 L and 20 L flasks. Samples were taken at different
operation intervals to conduct harvesting studies. Batch experiments were conducted to
investigate the effect of sorption of microalgae on the magnetic material. The experimental
data in the presence of magnetic material were adequately described by the Langmuir
isotherm. Scenedesmus rubescens was better adsorbed and harvested than Dunaliella
tertiolecta. Furthermore, the recovery of microalgae biomass was greater in cultures with
high cell concentration compared to cultures with low concentrations. The results of the
jar-test experiments showed that the AlCl3 was more effective than the other two
flocculants tested. Specifically, the harvesting efficiency was up to 99% for both
microalgae species. Gravity sedimentation was tested for 1 h in both species, and
better sedimentation efficiency was observed with the Scenedesmus rubescens. |
|
|
|
|
|
|