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Trends in Applied Sciences Research
  Year: 2011 | Volume: 6 | Issue: 10 | Page No.: 1222-1229
DOI: 10.17311/tasr.2011.1222.1229
 
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Evaluation of the Mass Transfer Capacity of a Long Tubular Photobioreactor with Static Mixer and its Outdoor Performance with Microalgal Cultures

C.U. Ugwu and H. Aoyagi

Abstract:
This study was aimed at improving the performance of a long outdoor tubular photobioreactor for high yield of algal biomass. A long tubular photobioreactor (with total tube length of approximately 20 m) was developed. In order to understand the performance of the tubular photobioreactor, hydrodynamics and gas-liquid transfer characteristics, as well as outdoor cultivation of microalgae were evaluated. Parameters that were used to evaluate the gas-liquid transfer characteristics of the photobioreactor included the overall mass transfer coefficient (kLa) and mixing time at various aeration rates (i.e., 0.05 to 0.35 vvm). At 0.35 vvm, presence of 8 static mixers on the riser section at a spacing of 1 m increased the kLa by 25 fold and prolonged the mixing time by 2.7 fold compared to that of the photobioreactor without static mixers. By using the tubular photobioreactor without static mixers, the average biomass productivities attained with Synechocystis aquatilis (S. aquatilis) and Chlorella sorokiniana (C. sorokiniana) were 0.55 and 0.35 g/L/day, respectively. However, upon installation of static mixers, biomass productivities of S. aquatilis and C. sorokiniana increased by 27 and 49% (i.e., 0.70 and 0.52 g/L/day), respectively. This study has indicated that efficiency of a 20 m long tubular photobioreactors and outdoor biomass productivities with the photobioreactor can be significantly improved when static mixers were 1 m apart from each other.
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How to cite this article:

C.U. Ugwu and H. Aoyagi, 2011. Evaluation of the Mass Transfer Capacity of a Long Tubular Photobioreactor with Static Mixer and its Outdoor Performance with Microalgal Cultures. Trends in Applied Sciences Research, 6: 1222-1229.

DOI: 10.17311/tasr.2011.1222.1229

URL: https://scialert.net/abstract/?doi=tasr.2011.1222.1229

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