Journal
BIORESOURCE TECHNOLOGY
Volume 200, Issue -, Pages 914-920Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.biortech.2015.11.006
Keywords
Microalgae harvesting; Fe3O4 nanoparticle removal; Centrifugal sedimentation; Magnetic sedimentation; Electrostatic adsorption
Funding
- Department of Chemical Engineering at the University of Rochester
- Leading Graduate Program in Science and Engineering, Waseda University
- Ministry of Education, Culture, Sports, Science and Technology (MEXT), Japan
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The objective of this study is to develop a simple, one-step approach to separate adsorbed Fe3O4 nanoparticles from microalgal flocs for further downstream processing. Using the wild-type strain of fresh-water algae Chlamydomonas reinhardtii, effective removal of nanoparticles from microalgal flocs by both centrifugal sedimentation (at 1500 or 2000g) and magnetic sedimentation (at 1500 Oe) is demonstrated. At the physiological pH of the solution (i.e., pH 7.0), where the electrostatic force between the nanoparticles and the microalgal cells is strongly attractive, larger separation force was achieved by simply increasing the density and viscosity of the solution to 1.065 g/mL and 1.244 cP, respectively. The method described here offers significant opportunity for purifying microalgal biomass after nanoparticle-flocculation-based harvesting and decreasing the cost of microalgal biotechnology. This may also find avenues in other applications that apply flocculation, such as algal biofilm formation in photobioreactors and wastewater treatment. (C) 2015 Elsevier Ltd. All rights reserved.
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