Magnetophoretic Harvesting of Nannochloropsis oculata Using Iron Oxide Immobilized Beads
| Autor: | Feng-Jen Chu, Terng-Jou Wan, His Chen, Po-Min Kao, Chih-Hung Wu |
|---|---|
| Jazyk: | angličtina |
| Rok vydání: | 2020 |
| Předmět: |
Flocculation
iron oxide lcsh:Hydraulic engineering Geography Planning and Development Iron oxide magnetic field 02 engineering and technology 010501 environmental sciences Aquatic Science 01 natural sciences Biochemistry Polyvinyl alcohol Ferrous chemistry.chemical_compound lcsh:Water supply for domestic and industrial purposes lcsh:TC1-978 alginate Nannochloropsis oculata 0105 earth and related environmental sciences Water Science and Technology Sodium alginate lcsh:TD201-500 021001 nanoscience & nanotechnology nannochloropsis oculata magnetophoretic harvesting polyvinyl alcohol chemistry immobilization Particle Acid treatment 0210 nano-technology Nuclear chemistry |
| Zdroj: | Water, Vol 12, Iss 1, p 236 (2020) Water Volume 12 Issue 1 |
| ISSN: | 2073-4441 |
| Popis: | In this work, the harvesting of Nannochloropsis oculata microalgae through the use of nanosized Fe3O4 immobilized in polyvinyl alcohol (PVA)/sodium alginate (SA) as a flocculant (Fe3O4/PS) is investigated. Using the Fe3O4/PS immobilized beads could reduce the amount of soluble ferrous ions (Fe2+) released from naked Fe3O4 in acid treatment, leading to easy recovery. The characterization was performed under different dosages and pH values of Fe3O4/PS. The results show that the Fe3O4/PS, when applied to the algae culture (500 mg dry cell weight/L), achieves a 96% harvesting efficiency under conditions of a pH of 4 with 200 mT magnetic field intensity. Fe3O4/PS can be directly reused without adjusting the pH value. The recycled Fe3O4/PS shows stability in terms of its surface properties, maintaining more than 80% harvesting efficiency after five recycles. Magnetophoretic harvesting, using immobilized magnetic iron oxide as a particle-based flocculant, is a potential method to reduce challenges related to the cost-effective microalgae-harvesting method. |
| Databáze: | OpenAIRE |
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