Membrane applications for microalgae cultivation and harvesting: a review
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With renewed interest in microalgae due to their potential for biofuel and bioproducts production, efficient cultivation and harvesting mechanisms are needed to increase the economic competitiveness of microalgal products against traditional sources. With pore sizes ranging from microns to angstroms, membranes provide tailored functions for solid/liquid separation (cell retention, biomass concentration and dewatering), gas/liquid separation (gas delivery and removal), and solute/liquid separation (bioproduct recovery, feedstock preparation and effluent recycling) that are problematic or not possible with other technologies. Existing knowledge on membrane systems used in other disciplines, such as environmental engineering, marine science, and biomedicine, can be applied to algae production. Though membranes have great potential to facilitate cultivation and harvesting, challenges in energy reduction and fouling mitigation need to be overcome for long-term, cost-effective application.
KeywordsDewatering Filtration Fouling Gas exchange Photobioreactor
The authors gratefully acknowledge funding from the U.S. Department of Education Graduate Assistants in Areas of National Need (GAANN) Fellowship and the National Science Foundation (Awards 1236746 and 1200682). Any opinions, findings, and conclusions or recommendations in this material are those of the author(s) and do not necessarily reflect the views of the National Science Foundation. The funding source did not influence the manuscript content or decision to submit it for publication. We thank Ana Prieto, Robert Bair, Onur Ozcan and Melanie Pickett for useful comments and recommendations for references included in this review.
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