Author(s): Ketheesan B, Nirmalakhandan N, Ketheesan B, Nirmalakhandan N
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Abstract A Scenedesmus sp. was cultivated in a 23-L airlift-driven raceway reactor under artificial lighting and laboratory conditions, in batch and continuous modes. In batch mode, a maximum volumetric biomass productivity of 0.085 dry g L(-1) day(-1) was achieved under sparging at a CO(2)-to-air ratio of 1\%, and a maximum CO(2) utilization efficiency of 33\% was achieved at a CO(2)-to-air ratio of 0.25\%. In continuous mode, the maximum volumetric biomass productivity was 0.19 dry g L(-1) day(-1). Biomass productivities per unit power input achieved in this reactor configuration (0.60-0.69 dry g W(-1) day(-1)) were comparable to or better than those reported in the literature for different photobioreactor designs (0.10-0.51 dry g W(-1) day(-1)). Based on the energy-efficient productivity and the high CO(2) utilization efficiency demonstrated in this study, the proposed airlift-driven raceway design holds promise for cost-effective algal cultivation. Copyright © 2012 Elsevier Ltd. All rights reserved.
This article was published in Bioresour Technol
and referenced in Journal of Bioprocessing & Biotechniques