Influence of starch on microalgal biomass recovery, settleability and biogas production
In the context of wastewater treatment with microalgae cultures, coagulation-flocculation followed by sedimentation is one of the suitable options for microalgae harvesting. This process is enabled by the addition of chemicals (e.g. iron). However, in a biorefinery perspective, it is important to av...
| Autores: | , , , |
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| Tipo de recurso: | artículo |
| Fecha de publicación: | 2015 |
| País: | España |
| Institución: | Universitat Politècnica de Catalunya (UPC) |
| Repositorio: | UPCommons. Portal del coneixement obert de la UPC |
| Idioma: | inglés |
| OAI Identifier: | oai:upcommons.upc.edu:2117/85004 |
| Acceso en línea: | https://hdl.handle.net/2117/85004 https://dx.doi.org/10.1016/j.biortech.2015.03.003 |
| Access Level: | acceso abierto |
| Palabra clave: | Biomass energy Coagulant Flocculant Harvesting High rate algal pond Microalgae CATIONIC STARCH FLOCCULATION CHITOSAN Biomassa Biogàs Algues -- Biotecnologia Àrees temàtiques de la UPC::Energies::Energia de la biomassa |
| Sumario: | In the context of wastewater treatment with microalgae cultures, coagulation-flocculation followed by sedimentation is one of the suitable options for microalgae harvesting. This process is enabled by the addition of chemicals (e.g. iron). However, in a biorefinery perspective, it is important to avoid possible contamination of downstream products caused by chemicals addition. The aim of this study was to evaluate the effect of potato starch as flocculant for microalgal biomass coagulation-flocculation and sedimentation. The optimal flocculant dose (25 mg/L) was determined with jar tests. Such a concentration led to more than 95% biomass recovery (turbidity < 9NTU). The settleability of flocs was studied using an elutriation apparatus measuring the settling velocities distribution. This test underlined the positive effect of starch on the biomass settling velocity, increasing to >70% the percentage of particles with settling velocities >6.5 m/h. Finally, biochemical methane potential tests showed that starch biodegradation increased the biogas production from harvested biomass. (C) 2015 Elsevier Ltd. All rights reserved. |
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