Next Article in Journal
Lake Evolution, Hydrodynamic Outburst Flood Modeling and Sensitivity Analysis in the Central Himalaya: A Case Study
Previous Article in Journal
Multi-Objective Optimization for Selecting and Siting the Cost-Effective BMPs by Coupling Revised GWLF Model and NSGAII Algorithm
Open AccessArticle

Magnetophoretic Harvesting of Nannochloropsis oculata Using Iron Oxide Immobilized Beads

1
Graduate School of Engineering Science and Technology, National Yunlin University of Science and Technology, Yunlin 64002, Taiwan
2
Department of Safety, Health and Environment Engineering, National Yunlin University of Science and Technology, Yunlin 64002, Taiwan
3
School of Resources and Chemical Engineering, Sanming University, Sanming 365004, China
4
Bachelor Program in Interdisciplinary Studies, National Yunlin University of Science and Technology, Yunlin 64002, Taiwan
5
Center for Green Sustainable and Innovation, National Yunlin University of Science and Technology, Yunlin 64002, Taiwan
*
Authors to whom correspondence should be addressed.
Water 2020, 12(1), 236; https://doi.org/10.3390/w12010236
Received: 27 November 2019 / Revised: 9 January 2020 / Accepted: 11 January 2020 / Published: 15 January 2020
(This article belongs to the Special Issue Advances in Microalgal Harvesting)
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. View Full-Text
Keywords: magnetophoretic harvesting; Nannochloropsis oculata; magnetic field; iron oxide; immobilization; polyvinyl alcohol; alginate magnetophoretic harvesting; Nannochloropsis oculata; magnetic field; iron oxide; immobilization; polyvinyl alcohol; alginate
Show Figures

Graphical abstract

MDPI and ACS Style

Chu, F.-J.; Wan, T.-J.; Chen, H.; Wu, C.-H.; Kao, P.-M. Magnetophoretic Harvesting of Nannochloropsis oculata Using Iron Oxide Immobilized Beads. Water 2020, 12, 236.

Show more citation formats Show less citations formats
Note that from the first issue of 2016, MDPI journals use article numbers instead of page numbers. See further details here.

Article Access Map by Country/Region

1
Back to TopTop