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Harvesting microalgae from wastewater treatment systems with natural flocculants: Effect on biomass settling and biogas production

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10.1016/j.algal.2015.03.010
 
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Gutiérrez Martínez, Raquel
Passos, Fabiana Lopes del ReiMés informacióMés informacióMés informació
Ferrer Martí, IvetMés informacióMés informacióMés informació
Uggetti, EnricaMés informacióMés informacióMés informació
García Serrano, JoanMés informacióMés informacióMés informació
Document typeArticle
Defense date2015-05-01
Rights accessOpen Access
Attribution-NonCommercial-NoDerivs 3.0 Spain
This work is protected by the corresponding intellectual and industrial property rights. Except where otherwise noted, its contents are licensed under a Creative Commons license : Attribution-NonCommercial-NoDerivs 3.0 Spain
Abstract
Research on new sources of bioenergy is nowadays driving attention to microalgae. Cost-effective biomass harvesting and thickening pose a challenge for massive microalgae production for biofuels. In this study, coagulation-flocculation and sedimentation with natural flocculants (Ecotan and Tanfloc) was evaluated on microalgae grown in an experimental high rate algal pond treating urban wastewater. Jar tests showed how flocculant doses of 10 and 50mg/L of Ecotan and Tanfloc enabled over 90% biomass recovery. Furthermore, settling column tests showed that both flocculants increased microalgae settling velocity, performing fast and efficient biomass recovery (>90% recovery in 10-20min). Thus, the use of either flocculant would enhance microalgal biomass reducing the HRT and settler volume. Finally, the potential toxicity of flocculants upon biomass production was assessed in biochemical methane potential tests. Results indicated that doses of 10-50mg/L of Ecotan and Tanfloc did not affect anaerobic digestion, leading to the same methane yield (162-166mL CH4/g VS) with the same methane content (70%) as the control without flocculants. This study demonstrates that Ecotan and Tanfloc flocculants would be appropriate for microalgae biomass harvesting and subsequent biogas generation.
CitationGutierrez, R., Passos , F., Ferrer, I., Uggetti, E., Garcia, J. Harvesting microalgae from wastewater treatment systems with natural flocculants: Effect on biomass settling and biogas production. "Algal Research-Biomass Biofuels and Bioproducts", 01 Maig 2015, vol. 9, p. 204-211. 
URIhttp://hdl.handle.net/2117/84997
DOI10.1016/j.algal.2015.03.010
ISSN2211-9264
Publisher versionhttps://www.sciencedirect.com/science/article/pii/S2211926415000739
Other identifiershttps://www.researchgate.net/publication/274097114_Harvesting_microalgae_from_wastewater_treatment_systems_with_natural_flocculants_Effect_on_biomass_settling_and_biogas_production
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  • Departament d'Enginyeria Civil i Ambiental - Articles de revista [3.411]
  • GEMMA - Grup d'Enginyeria i Microbiologia del Medi Ambient - Articles de revista [226]
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