Enhancing vorticity magnitude of turbulent flow to promote photochemical efficiency and trichome helix pitch of Arthrospira platensis in a raceway pond with conic baffles

Summary The weight ratio of Na2CO3/NaHCO3 was investigated in order to improve microalgal productivity in large‐scale industrial operations by converting NaHCO3 to Na2CO3 with a growth of Arthrospira platensis cells in 660 m2 raceway ponds. Two microalgal cultivation systems with a NaHCO3 by‐product (SPBP) and a CO2 bicarbonation absorber (CBAP) were firstly thoroughly introduced. There was a 13.3% decrease in the initial weight ratio of Na2CO3/NaHCO3 resulting in a 25.3% increase in the biomass growth rate with CBAP, compared to that of SPBP. Increased sunlight intensity, solution temperature and pH all resulted in both a higher HCO3- absorbance and CO32- release, thereby increasing the weight ratio of Na2CO3/NaHCO3 during the growth of A. platensis. The biomass growth rate was peaked at 39.9 g m−2 day−1 when the weight ratio of Na2CO3/NaHCO3 was 3.7. Correspondingly, the cell pigments (chlorophyll a and carotenoid) and trichome size (helix pitch and trichome length) reached to a maximum state of 8.47 mg l−1, 762 μg l−1, 57 and 613 μm under the CBAP system.

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“…An increased sunlight intensity and solution temperature enhances the expression level of relative enzymes, which promotes the absorption of

{HCO}_{3}^{-}

(Giordano and Beardall, ). The continually generated OH − (Guan et al ., ) reacts with

{HCO}_{3}^{-}

to produce

{CO}_{3}^{2 -}

(Cheng et al ., , b). Thus, the WRB gradually increases.…”

Section: Resultsmentioning

confidence: 99%

Conversion of NaHCO₃ to Na₂CO₃ with a growth of Arthrospira platensis cells in 660 m² raceway ponds with a CO₂ bicarbonation absorber

Guo

Cheng

Kubar

et al. 2019

Microbial Biotechnology

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“…The bubble diameter of foam was determined, as described previously [ 22 ], by using a Nikon inverted fluorescence microscope (Nikon Corporation, Tokyo, Japan) and calculated by using software (NIS-Elements BR4.00.12). The bubble diameter was measured twice per day for 4 consecutive days.…”

Section: Methodsmentioning

confidence: 99%

“…Such impacts can lead to economic losses of varying magnitudes. Numerous studies have provided advances in structural engineering in reactor design for attaining maximum algal biomass yield; however, the formation of foam during algal cultivation in photo-bioreactors is still unreported in the existing literature [ 21 , 22 , 23 , 24 ].…”

Section: Introductionmentioning

confidence: 99%

Dynamic Foam Characteristics during Cultivation of Arthrospira platensis

Kubar

Ali²,

Kumar³

et al. 2022

Bioengineering

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This study is aimed at understanding the serious foaming problems during microalgal cultivation in industrial raceway ponds by studying the dynamic foam properties in Arthrospira platensis cultivation. A. platensis was cultivated in a 4 L bowl bioreactor for 4 days, during which the foam height above the algal solution increased from 0 to 30 mm with a bubble diameter of 1.8 mm, and biomass yield reached 1.5 g/L. The algal solution surface tension decreased from 55 to 45 mN/m, which favored the adsorption of microalgae on the bubble to generate more stable foams. This resulted in increased foam stability (FS) from 1 to 10 s, foam capacity (FC) from 0.3 to 1.2, foam expansion (FE) from 15 to 43, and foam maximum density (FMD) from 0.02 to 0.07. These results show a decrease in CO2 flow rate and operation temperature when using the Foamscan instrument, which minimized the foaming phenomenon in algal solutions to a significantly lower and acceptable level.

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“…where PFD is the photon flux density (300 μmol m −2 s −1 ) and a factor of 0.5 was used because of the two-electron excitation levels (PS-II and PS-I). 23 The test procedures were repeated in triplicate (n = 3) for each measurement, and average values with standard deviation were used for subsequent analysis. The growth of microalgae was quantified based on the chlorophyll-a content of the cultivated medium.…”

Section: Measurement Of Chlorophyll Fluorescence Andmentioning

confidence: 99%

“…A detailed description of the procedure and calculations has been reported previously. 23 The test procedures were repeated in triplicate (n = 3) for each measurement, and average values with standard deviations were used for analysis.…”

Section: Measurement Of Nutrient Concentrationsmentioning

confidence: 99%

Butterfly Baffle-Enhanced Solution Mixing and Mass Transfer for Improved Microalgal Growth in Double-Column Photobioreactor

Kumar

Jia

Kubar

et al. 2022

Ind. Eng. Chem. Res.

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High microalgal growth rates depend on appropriate solution mixing, and therefore, mass transfer can be achieved by installing baffle structures into photobioreactor (PBR) systems. In this study, butterfly-shaped baffles were installed in a double-column photobioreactor (DC-PBR) to decrease the mixing time, increase the mass transfer coefficient, and promote the growth rate of Arthrospira platensis. The mixing time was reduced by 20%, increasing the baffle size and the angle between wings, resulting in the mass transfer coefficient being simultaneously enhanced by 32%. The vertical flow vortices generated by the butterfly baffles strengthened the light/dark cycle between the inner and outer columns in DC-PBRs, which improved the chlorophyll-a content by 19%, photochemical efficiency and electron transfer rate by 20% during photosynthesis. The biomass growth rate of A. platensis was increased by 33% with the addition of a butterfly baffle to the PBR, while the helix pitch and trichome length were enlarged by 15–16%.

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Enhancing vorticity magnitude of turbulent flow to promote photochemical efficiency and trichome helix pitch of Arthrospira platensis in a raceway pond with conic baffles

Cited by 23 publications

References 46 publications

Conversion of NaHCO₃ to Na₂CO₃ with a growth of Arthrospira platensis cells in 660 m² raceway ponds with a CO₂ bicarbonation absorber

Conversion of NaHCO₃ to Na₂CO₃ with a growth of Arthrospira platensis cells in 660 m² raceway ponds with a CO₂ bicarbonation absorber

Dynamic Foam Characteristics during Cultivation of Arthrospira platensis

Butterfly Baffle-Enhanced Solution Mixing and Mass Transfer for Improved Microalgal Growth in Double-Column Photobioreactor

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Enhancing vorticity magnitude of turbulent flow to promote photochemical efficiency and trichome helix pitch of Arthrospira platensis in a raceway pond with conic baffles

Cited by 23 publications

References 46 publications

Conversion of NaHCO3 to Na2CO3 with a growth of Arthrospira platensis cells in 660 m2 raceway ponds with a CO2 bicarbonation absorber

Conversion of NaHCO3 to Na2CO3 with a growth of Arthrospira platensis cells in 660 m2 raceway ponds with a CO2 bicarbonation absorber

Dynamic Foam Characteristics during Cultivation of Arthrospira platensis

Butterfly Baffle-Enhanced Solution Mixing and Mass Transfer for Improved Microalgal Growth in Double-Column Photobioreactor

Contact Info

Product

Resources

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Conversion of NaHCO₃ to Na₂CO₃ with a growth of Arthrospira platensis cells in 660 m² raceway ponds with a CO₂ bicarbonation absorber

Conversion of NaHCO₃ to Na₂CO₃ with a growth of Arthrospira platensis cells in 660 m² raceway ponds with a CO₂ bicarbonation absorber