Using magnetic materials to harvest microalgal biomass: Evaluation of harvesting and detachment efficiency
Abstract
Using naked iron oxide (Fe3O4) and yttrium iron oxide (Y3Fe5O12) nanoparticles as flocculants, the harvesting efficiency of Chlorella vulgaris biomass was investigated. The harvesting process includes two steps, which are the separation of microalgae from the culture solution with the magnetic nanoparticles and then the separation of the algae from the magnetic nanoparticles. The optimal dosages and pH values for the magnetic harvesting of microalgal biomass were determined. Results showed that Y3Fe5O12 nanoparticles were more efficient in microalgal biomass harvesting than Fe3O4 nanoparticles. In an effort to achieve more than 90% of harvesting efficiency, optimal dosages for Fe3O4 and Y3Fe5O12 to harvest microalgal biomass were 10 and 2.5 g/L, while the appropriate pH values were 6.2 and 7.3, respectively. The harvesting efficiency of Fe3O4 and Y3Fe5O12 nanoparticles increased as the pH value decreased. The experimental results also showed that under a higher pH value Fe3O4 nanoparticles were much easier to be separated from the flocs than Y3Fe5O12. 62.9% of Fe3O4 nanoparticles could be de-attached from the aggregates, when the floc pH value reached 12.3.
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Several dewatering approaches have been explored at laboratory, pilot and commercial scales.
“Several dewatering approaches have been explored at laboratory, pilot and commercial scales [100,101,102,103].”
From Factors Affecting Microalgae Production for Biofuels and the Potentials of Chemometric Methods in Assessing and Optimizing Productivity (2019) · cites this paper as [102]
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- Authors
- Zhu, L.-D., Hiltunen, E., & Li, Z.
- Affiliations
- Wuhan University (CN)
- University of Vaasa (FI)
- Hubei University (CN)
- Corresponding author
- Zhu, L.-D.
- Li, Zhaohua
- Venue
- Environmental Technology
- Publisher
- Informa UK Limited
- Published
- 2017-12-15
- Volume
- 40
- Issue
- 8
- Pages
- 1006-1012
- ISSN
- 0959-3330 (ISSN-L)
- 1479-487X
- OpenAlex
- W2771077117
- Cited by
- 58
- References
- 31
- Citations by year
- 2026: 4 · 2025: 7 · 2024: 5 · 2023: 7 · 2022: 6 · 2021: 5 · 2020: 16 · 2019: 5 · 2018: 3
- FWCI
- 1.76
- Type
- journal article
- Language
- en
- Open access
- closed
- Locations
- Environmental Technology (publishedVersion)
- PubMed (publishedVersion)
- Funders
- TransAlgae Project
- Botnia-Atlantica Programme
- Topics
- Physical Sciences › Energy › Renewable Energy, Sustainability and the Environment › Algal biology and biofuel production
- Physical Sciences › Environmental Science › Water Science and Technology › Coagulation and Flocculation Studies
- Physical Sciences › Environmental Science › Water Science and Technology › Minerals Flotation and Separation Techniques
- Keywords
- magnetic nanoparticles, microalgae harvesting, Chlorella vulgaris, iron oxide nanoparticles, flocculation, magnetic separation, harvesting efficiency, pH effect, nanoparticle dose
- MeSH terms
- Flocculation, Magnetics, Biomass, Chlorella vulgaris, Nanoparticles, Microalgae
About these checks
Registry, retraction, Cites and statistics results are computed, not judged, with one exception: a printed reference that no index lists is read once by a model before it counts as a citation error. Claims are extracted by a model and kept only when their quote appears verbatim in the text; each cited source is then checked, with a model’s help, for whether it says what the claim relies on. Those verdicts can be wrong — read the claim’s quote and the cited source before relying on one.
Statistics and arithmetic are recomputed, not judged.
Confidence bands are shown only for fields calibrated on our annotated test set. None is calibrated yet, so no band is shown.
What counts as a claim ›How we measure confidence ›How we check this ›
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