Title: The air-lift photobioreactors with flow patterning for high-density cultures of microalgae and carbon dioxide removal
Authors: Chiu, Sheng-Yi
Tsai, Ming-Ta
Kao, Chien-Ya
Ong, Seow-Chin
Lin, Chih-Sheng
Department of Biological Science and Technology
Keywords: Biomass;Carbon dioxide;Chlorella sp.;Photobioreactor
Issue Date: 1-Jun-2009
Abstract: A photobioreactor containing microalgae is a highly efficient system for converting carbon dioxide (CO(2)) into biomass. Using a microalgal photobioreactor as a CO(2) mitigation system is a practical approach to the problem Of CO(2) emission from waste gas. In this study, a marine microalga, Chlorella sp. NCTU-2, was applied to assess biomass production and CO(2) removal. Three types of photobioreactors were designed and used: (i) without inner column (i.e. a bubble column), (ii) with a centric-tube column and (iii) with a porous centric-tube column. The specific growth rates (it) of the batch cultures in the bubble column, the centric-tube and the porous centric-tube photobioreactor were 0.180, 0.226 and 0.252 day(-1), respectively. The porous centric-tube photobioreactor, operated in semicontinuous culture mode with 10% CO(2) aeration, was evaluated. The results show that the maximum biomass productivity was 0.61 g/L when one fourth of the culture broth was recovered every 2 days. The CO(2) removal efficiency was also determined by measuring the influent and effluent loads at different aeration rates and cell densities of Chlorella sp. NCTU-2. The results show that the CO(2), removal efficiency was related to biomass concentration and aeration rate. The maximum CO(2) removal efficiency of the Chlorella sp. NCTU-2 culture was 63% when the biomass was maintained at 5.15 g/L concentration and 0.125 vvm aeration (volume gas per volume broth per min; 10% CO(2) in the aeration gas) in the porous centric-tube photobioreactor.
URI: http://dx.doi.org/10.1002/elsc.200800113
ISSN: 1618-0240
DOI: 10.1002/elsc.200800113
Volume: 9
Issue: 3
Begin Page: 254
End Page: 260
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