CARBON DIOXIDE BIOFIXATION BY Chlorella sp. IN A BUBBLE COLUMN REACTOR AT DIFFERENT FLOW RATES AND CO2 CONCENTRATIONS

Pourjamshidian, Reza; Abolghasemi, Hossein; Esmaili, Mohammad; Amrei, Hossein Delavari; Parsa, Mehran; Rezaei, Somayeh

doi:10.1590/0104-6632.20190362s20180151

Cited by 26 publications

(16 citation statements)

References 33 publications

(33 reference statements)

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“…Additionally, these same three metabolic processes themselves change the pH of the surrounding seawater of the algae. Therefore, these changes have serious pressure on algae, including macroalgae ( Kinnby et al, 2021 , Xiao et al, 2021 ) or microalgae ( Pourjamshidian et al, 2019 ). According to the European Water Framework Directive (EWFD) 2000/60/CE, the algal community is considered an essential indicator of anthropogenic stresses in water ecosystems since it might alter the composition of their community, leading to the change or disappearance of some species ( Baggini et al, 2014 , Elshobary et al, 2020b , Han et al, 2020 ).…”

Section: Introductionmentioning

confidence: 99%

Effects of ocean acidification on the growth and biochemical composition of a green alga (Ulva fasciata) and its associated microbiota

Barakat

El‐Sayed

Khairy

et al. 2021

Saudi Journal of Biological Sciences

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In marine ecosystems, fluctuations in surface-seawater carbon dioxide (CO 2 ), significantly influence the whole metabolism of marine algae, especially during the early stages of macroalgal development. In this study, the response of the green alga Ulva fasciata for elevating ocean acidification was investigated using four levels of p CO 2 ~ 280, 550, 750 and 1050 µatm. Maximum growth rate (6.6% day −1 ), protein (32.43 %DW) and pigment (2.9 mg/g) accumulation were observed at p CO 2 -550 with an increase of ~2-fold compared to control. On the other hand, lipid and carbohydrate contents recorded their maximum production (4.23 and 46.96 %DW, respectively) at p CO 2 -750 while control showed 3.70 and 42.37 %DW, respectively. SDS-PAGE showed the presence of unique bands in response to p CO 2, especially at 550 µatm. Dominant associated bacteria was shifted from Halomonas hydrothermalis of control to Vibrio toranzoniae at p CO 2 -1050. These findings suggest that ocean acidification at 550 µatm might impose noticeable effects on growth, protein, pigments, and protein profile of U. fasciata, which could be a good source for fish farming. While, p CO 2 -750 was recommended for energetic purpose, due to its high lipid and carbohydrate contents.

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Section: Introductionmentioning

confidence: 99%

Effects of ocean acidification on the growth and biochemical composition of a green alga (Ulva fasciata) and its associated microbiota

Barakat

El‐Sayed

Khairy

et al. 2021

Saudi Journal of Biological Sciences

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“…They found that with an increase in the flow rate from 50 to 70 mL/min, the maximum biomass concentration of Chlorella sp. increased from 2.5 to 2.8 g/L (Table 5) [57].…”

Section: Cyanobacterial Growthmentioning

confidence: 99%

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

et al. 2022

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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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“…Concentrations of CO 2 may be an important factor to limit growth and development of some microalgal species [28], however, minimum and maximum concentrations CO 2 dissolved in the culture medium for microalgae cultivation vary from one species to another [29]. Some microalgae can grow under atmospheric air [30], others in extremely high CO 2 concentrations ranging from 40 to 100 vol% [31]. Compressed CO 2 can also be used in cultivation [32], but this increases the costs, which are related to the capture, compression, transport or storage of this gas [33].…”

Section: Introductionmentioning

confidence: 99%

Utilisation of CO2 from Sodium Bicarbonate to Produce Chlorella vulgaris Biomass in Tubular Photobioreactors for Biofuel Purposes

2021

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Microalgae are one of the most promising sources of renewable substrates used for energy purposes. Biomass and components accumulated in their cells can be used to produce a wide range of biofuels, but the profitability of their production is still not at a sufficient level. Significant costs are generated, i.a., during the cultivation of microalgae, and are connected with providing suitable culture conditions. This study aims to evaluate the possibility of using sodium bicarbonate as an inexpensive alternative CO2 source in the culture of Chlorella vulgaris, promoting not only the increase of microalgae biomass production but also lipid accumulation. The study was carried out at technical scale using 100 L photobioreactors. Gravimetric and spectrophotometric methods were used to evaluate biomass growth. Lipid content was determined using a mixture of chloroform and methanol according to the Blight and Dyer method, while the carbon content and CO2 fixation rate were measured according to the Walkley and Black method. In batch culture, even a small addition of bicarbonate resulted in a significant (p ≤ 0.05) increase in the amount of biomass, productivity and optical density compared to non-bicarbonate cultures. At 2.0 g∙L–1, biomass content was 572 ± 4 mg·L−1, the maximum productivity was 7.0 ± 1.0 mg·L–1·d–1, and the optical density was 0.181 ± 0.00. There was also an increase in the lipid content (26 ± 4%) and the carbon content in the biomass (1322 ± 0.062 g∙dw–1), as well as a higher rate of carbon dioxide fixation (0.925 ± 0.073 g·L–1·d–1). The cultivation of microalgae in enlarged scale photobioreactors provides a significant technological challenge. The obtained results can be useful to evaluate the efficiency of biomass and valuable cellular components production in closed systems realized at industrial scale.

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CARBON DIOXIDE BIOFIXATION BY Chlorella sp. IN A BUBBLE COLUMN REACTOR AT DIFFERENT FLOW RATES AND CO2 CONCENTRATIONS

Cited by 26 publications

References 33 publications

Effects of ocean acidification on the growth and biochemical composition of a green alga (Ulva fasciata) and its associated microbiota

Effects of ocean acidification on the growth and biochemical composition of a green alga (Ulva fasciata) and its associated microbiota

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

Utilisation of CO2 from Sodium Bicarbonate to Produce Chlorella vulgaris Biomass in Tubular Photobioreactors for Biofuel Purposes

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