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标题：Evaluation of CO₂ Removal Efficiency of Pseudanabaena limnetica (Lemm.) Komárek Grown in Na₂CO₃ Enriched Seawater Medium in 60 L Airlift Flat Panel Photobioreactor
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作者：Xuelian Li ; Nshid Nigar ; Alex Kostogriz 等
期刊名称：Journal of Environmental Science and Technology
印刷版ISSN：1994-7887
电子版ISSN：2077-2181
出版年度：2019
卷号：12
期号：4
页码：186-196
DOI：10.3923/jest.2019.186.196
出版社：Asian Network for Scientific Information
摘要：Background and Objective: Oceans are major sinks for the anthropogenic CO₂ and microalgae play a characteristic role in mitigating it. Due to the heavily released anthropogenic CO₂ into the environment, the natural phenomena those control the CO₂ concentration in atmosphere are now not sufficient enough to normalise it. This has imparted on a need of novel environmental friendly option of CO₂ sequestration. Cultivating microalgae for biofuel can directly consume the industrially released CO₂ and help to reduce the release of anthropogenic CO₂, but making this CO₂ available into the liquid medium by artificial mean is the challenge. Buffering ability of seawater accelerates the mass transfer of CO₂ in an aqueous phase and can hasten up the removal of anthropogenic CO₂. Materials and Methods: In present communication salt tolerating strain Pseudanabaena limnetica (Lemm.) Kom á rek was grown in the operationally optimized 60L flat panel photobioreactor containing Na₂CO₃ rich Modified Seawater BG11 medium (MSWBG11). Initially, CO₂ dissolution capacity of only seawater and MSWBG11 medium was determined. Then the effect of 2 different CO₂ flow rates viz. < 0.001LPM (set I) and < 0.005LPM (set II) on CO₂ dissolution (DCO₂), associated pH change and its effect on biomass production in MSWBG11 were studied. Results: In the control experiment the DCO₂ was reduced from 2.08-1.19 mg L¹ and the amount of dry biomass produced was 1.15 g L¹. In set I the DCO₂ concentration was maintained in the range of 8-15 mg L¹ and the biomass produced was 1 g L¹. In set II the DCO₂ remained in the range of 3.59-4.00 mg L¹ and the biomass produced was 1.20 g L¹. Conclusion: Thus, feeding of CO₂ at a lower flow rate was found to be favorable for algal growth. Though the mass transfer coefficient (KLa min¹) increased at the higher CO₂ flow rate, the actual percentage of CO₂ removal was not increased.
关键词：CO2; seawater; salt tolerating; flat panel photobioreactor; mass transfer coefficient (KLa minG1 ); percentage CO2 removal