Design of an airlift loop bioreactor and pilot scales studies with fluidic oscillator induced microbubbles for growth of a microalgae Dunaliella salina

Zimmerman, William B.; Zandi, Mohammad; Bandulasena, Hemaka C.H.; Tesař, Václav; Gilmour, D. James; Ying, Kezhen

doi:10.1016/j.apenergy.2011.02.013

Cited by 125 publications

(59 citation statements)

References 19 publications

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…The reading taken the following day before dosing indicates the decrease in the dissolved CO 2 and gives the amount of CO 2 uptake by D. salina. [12] demonstrated a pilot scale microalgal culture using a similar design of ALB as in this study, the results also showed that such ALB culture was neither CO 2 limited nor O 2 inhibited, which led to a high algal growth rate.…”

Section: Resultsmentioning

confidence: 50%

“…culture taken each day was determined by measuring the optical density at wavelengths of 645 nm and 663 nm using the method described by Zimmerman et al [12]. The overall specific growth rate were obtained at the end of the culture growth period as described by Scragg [13], which was estimated from the slope of a semilog plot of ln(C t /C 0 ) versus t. The CO 2 concentration dissolved in the medium was calculated from the current pH using Equation (2), of which the detailed derivation is shown in Appendix A.…”

Section: Resultsmentioning

confidence: 99%

“…The algal species for this study was Dunaliella salina [12], which has a wide pH range from 6 to 9. The strain was obtained from the Culture Centre of Algae and Protozoa, SAMS, Oban, UK as CCAP 19/30.…”

Section: Experimental Setup and Processesmentioning

confidence: 99%

See 2 more Smart Citations

Growth Enhancement of Dunaliella salina by Microbubble Induced Airlift Loop Bioreactor (ALB)—The Relation between Mass Transfer and Growth Rate

Ying¹,

Gilmour²,

Shi³

et al. 2013

JBNB

Self Cite

View full text Add to dashboard Cite

The efficiency of a novel microalgal culture system (an airlift loop bioreactor [ALB] engaged with a fluidic oscillator to produce microbubbles) is compared with both a conventional ALB (producing fine bubbles without the fluidic oscillator) and non-aerated flask culture. The impact of CO 2 mass transfer on Dunaliella salina growth is assessed, through varying the gas (5% CO 2 , 95% N 2 ) dosing flow rate. The results showed that approximately 6 -8 times higher chlorophyll content was achieved in the aerated ALB cultures than in the non-aerated flasks, and there was a 20% -40% increase in specific growth rate of D. salina in the novel ALB with microbubbles when compared with the conventional ALB cultures. The increase in chlorophyll content was found to be proportional to the total amount of CO 2 mass transfer. For the same dosing time and flow rate, higher CO 2 mass transfer rate (microbubble dosing) resulted in a greater growth rate.

show abstract

Section: Resultsmentioning

confidence: 50%

Section: Resultsmentioning

confidence: 99%

See 1 more Smart Citation

Growth Enhancement of Dunaliella salina by Microbubble Induced Airlift Loop Bioreactor (ALB)—The Relation between Mass Transfer and Growth Rate

Ying¹,

Gilmour²,

Shi³

et al. 2013

JBNB

Self Cite

View full text Add to dashboard Cite

show abstract

“…This is due to the laminar pattern of the microbubble through the liquid which gently detached from the pores of the diffuser [8,[11][12][13]. This advantage gives the preference for evaporation to dominate over the sensible heat transfer during the bubble rising through liquid until the maximum concentration is achieved.…”

Section: Resultsmentioning

confidence: 99%

Microbubble Distillation for Ethanol-Water Separation

Al-Yaqoobi

Hogg²,

Zimmerman

2016

International Journal of Chemical Engineering

Self Cite

View full text Add to dashboard Cite

In the current study, a novel approach for separating ethanol-water mixture by microbubble distillation technology was investigated. Traditional distillation processes require large amounts of energy to raise the liquid to its boiling point to effect removal of volatile components. The concept of microbubble distillation by comparison is to heat the gas phase rather than the liquid phase to achieve separation. The removal of ethanol from the thermally sensitive fermentation broths was taken as a case of study. Consequently the results were then compared with those which could be obtained under equilibrium conditions expected in an "ideal" distillation unit. Microbubble distillation has achieved vapour compositions higher than that which could be obtained under traditional equilibrium conditions. The separation was achieved at liquid temperature significantly less than the boiling point of the mixture. In addition, it was observed that the separation efficiency of the microbubble distillation could be increased by raising the injected air temperature, while the temperature of the liquid mixture increased only moderately. The separation efficiency of microbubble distillation was compared with that of pervaporation for the recovery of bioethanol from the thermally sensitive fermentation broths. The technology could be controlled to give high separation and energy efficiency. This could contribute to improving commercial viability of biofuel production and other coproducts of biorefinery processing.

show abstract

“…Recently, an innovative microbubble generation system (fluidic oscillator) with lower power consumption has been invented by Zimmerman et al [13,14] with the benefits of energy saving and improved efficiency. The detailed information on fluidic oscillator and its microbubble generation mechanism were described in previous studies [13][14][15]. This study aims to investigate the effect of microbubbbles (generated by fluidic oscillator) on mass transfer under different aeration flow rates.…”

Section:        mentioning

confidence: 99%

Enhanced Mass Transfer in Microbubble Driven Airlift Bioreactor for Microalgal Culture

Ying¹,

Al-Mashhadani²,

Hanotu³

et al. 2013

ENG

Self Cite

View full text Add to dashboard Cite

In this study, the effect of microfluidic microbubbles on overall gas-liquid mass transfer (CO 2 dissolution and O 2 removal) was investigated under five different flow rates. The effect of different liquid substrate on CO 2 mass transfer properties was also tested. The results showed that the K L a can be enhanced by either increasing the dosing flowrate or reducing the bubble size; however, increasing the flow rate to achieve a higher K L a would ultimately lower the CO 2 capture efficiency. In order to achieve both higher CO 2 mass transfer rate and capture efficiency, reducing bubble size (e.g. using microbubbles) has been proved more promising than increasing flow rate. Microbubble dosing with 5% CO 2 gas showed improved K L a by 30% -100% across different flow rates, compared to fine-bubble dosing. In the real algal culture medium, there appears to be two distinct stages in terms of K L a, divided by the pH of 8.4.

show abstract

Design of an airlift loop bioreactor and pilot scales studies with fluidic oscillator induced microbubbles for growth of a microalgae Dunaliella salina

Cited by 125 publications

References 19 publications

Growth Enhancement of Dunaliella salina by Microbubble Induced Airlift Loop Bioreactor (ALB)—The Relation between Mass Transfer and Growth Rate

Growth Enhancement of Dunaliella salina by Microbubble Induced Airlift Loop Bioreactor (ALB)—The Relation between Mass Transfer and Growth Rate

Microbubble Distillation for Ethanol-Water Separation

Enhanced Mass Transfer in Microbubble Driven Airlift Bioreactor for Microalgal Culture

Contact Info

Product

Resources

About