Journal
BIORESOURCE TECHNOLOGY
Volume 363, Issue -, Pages -Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.biortech.2022.128009
Keywords
Flocculation; Nanoparticle; Microalgae; Harvesting; Magnetite
Funding
- Taiwan's MOST [109-2222-E-992-002, 110-3116-F-006-003, 110-2221-E-029-004-MY3, 110-2621-M-029-001]
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The study aims to develop magnetite nanoparticles (MNPs) and utilize their high reusability potential to reduce the harvesting cost of microalgae biomass. Experimental results show that MNPs can achieve high harvesting efficiency under specific conditions and can be recovered and reused through alkaline treatment for multiple cycles. This study provides a cost-effective harvesting method for commercial-scale algae biorefining in the future.
For commercial scale algal biorefining, harvesting cost is a major bottleneck. Thus, a cost-effective, less-energy intensive, and efficient harvesting method is being investigated. Among several harvesting methods, magnetic flocculation offers the benefits of modest operation, energy savings and quick separation. This study aims to develop novel magnetite-(Fe3O4) nanoparticles (MNPs) of 20 nm average size and their high reusability potential to reduce the harvesting cost of microalgae biomass. The MNPs were synthesized and characterized using FTIR, Zeta analyzer, and SEM before performing on Chlorella sorokiniana Kh12 and Tu5. For maximum harvesting efficiency > 99%, the optimal culture pH, MNPs concentration, and agitation speed were 3, 200 mg/L, and 450 rpm, respectively. Subsequently, MNPs were recovered via alkaline treatment and reused up to 5 cycles as they retained their reactivity and harvesting efficiency. The studied MNPs-based harvesting method could be adopted at a commercial scale for cost-effective algae biorefinery in the future.
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