Investigation of Hydrodynamic Parameters in an Airlift Photobioreactor on CO2 Biofixation by Spirulina sp.

被引:2
|
作者
Zarei, Zahra [1 ]
Malekshahi, Peyman [1 ]
Trzcinski, Antoine P. [2 ]
Morowvat, Mohammad Hossein [3 ,4 ]
机构
[1] Univ Sistan & Baluchestan, Dept Chem Engn, POB 98167-45845, Zahedan, Iran
[2] Univ Southern Queensland, Sch Civil Engn & Surveying, West St, Toowoomba, Qld 4350, Australia
[3] Shiraz Univ Med Sci, Pharmaceut Sci Res Ctr, POB 71468-64685, Shiraz, Iran
[4] Shiraz Univ Med Sci, Sch Pharm, Dept Pharmaceut Biotechnol, POB 71468-64685, Shiraz, Iran
关键词
airlift photobioreactor; carbon sequestration; CO2; biofixation; gas holdup; liquid circulation velocity; Spirulina sp; CARBON-DIOXIDE; MASS-TRANSFER; GAS HOLDUP; BUBBLE-COLUMN; MIXING CHARACTERISTICS; LOOP PHOTOBIOREACTOR; MICROALGAE; REACTOR; CULTIVATION; PLATENSIS;
D O I
10.3390/su14127503
中图分类号
X [环境科学、安全科学];
学科分类号
08 ; 0830 ;
摘要
The rise of CO2 concentration on Earth is a major environmental problem that causes global warming. To solve this issue, carbon capture and sequestration technologies are becoming more and more popular. Among them, cyanobacteria can efficiently sequestrate CO2, which is an eco-friendly and cost-effective way of reducing carbon dioxide, and algal biomass can be harvested as valuable products. In this study, the hydrodynamic parameters of an airlift photobioreactor such as gas holdup, mean bubble diameter and liquid circulation velocity were measured to investigate CO2 biofixation by Spirulina sp. The total gas holdup was found to increase linearly with the increase in the gas velocity from 0.185 to 1.936 cm/s. The mean bubble velocities in distilled water only and in the cyanobacterial culture on the first and sixth days of cultivation were 109.97, 87.98, and 65.89 cm/s, respectively. It was found that shear stress at gas velocities greater than 0.857 cm/s led to cyanobacterial death. After 7 days of batch culture, the maximum dry cell weight reached 1.62 g/L at the gas velocity of 0.524 cm/s, whereas the highest carbon dioxide removal efficiency by Spirulina sp. was 55.48% at a gas velocity of 0.185 cm/s, demonstrating that hydrodynamic parameters applied in this study were suitable to grow Spirulina sp. in the airlift photobioreactor and remove CO2.
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页数:15
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