Drag-reducing polysaccharides from marine microalgae: species productivity and drag reduction effectiveness |
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| Authors: | K Gasljevic K Hall D Chapman E F Matthys |
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| Institution: | (1) Department of Mechanical Engineering, University of California at Santa Barbara, Santa Barbara, CA 93106, USA;(2) Ecology, Evolution, and Marine Biology Department, University of California at Santa Barbara, Santa Barbara, CA 93106, USA |
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| Abstract: | We have conducted a study of the potential use of drag-reducing biopolymers produced by marine microalgae for engineering
applications. Several marine microalgae species were tested for their production of drag-reducing polysaccharides in large
custom-designed plate bioreactors. Promising species (such as Porphyridium cruentum, Rhodella maculata, Schizochlamydella capsulata and Chlorella stigmatophora) were cultured for periods of time ranging from a few weeks to over 6 months. The basic drag-reducing ability of the polysaccharides
was established by comparing their drag reduction effectiveness at various concentrations in water. The algal polysaccharide
mass productivity was also measured per unit area of bioreactor’s illuminated surface. Finally, an all-inclusive criterion,
the volumetric production of drag-reducing water giving a set level of drag reduction was quantified, and led us to a ranking
of the tested species in order of productivity relevant to implementation. Some aspects of polysaccharide production by aged
cultures were investigated as well. We also quantified the drag-reducing effectiveness of intracellular polysaccharides, and
visualized the presence of exopolymer particles in the medium. |
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| Keywords: | Biopolymer Bioreactor Ship Friction Drag |
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