Developing a Spiral-Ascending CO<sub>2</sub> Dissolver to Enhance CO<sub>2</sub> Mass Transfer in a Horizontal Tubular Photobioreactor for Improved Microalgal Growth

Xu, Junchen; Cheng, Jun; Xin, Kai; Xu, Jinhui; Yang, Weijuan

doi:10.1021/acssuschemeng.0c06124

Cited by 31 publications

(4 citation statements)

References 45 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The literature review indicates that increasing the mass transfer and residence time of gas in liquid is beneficial to the productivity of microalgae 28,29 . Figure 9b tells the relationship between the volumetric mass transfer coefficient and the speed of the paddlewheel in the four RWPs of different structures.…”

Section: Resultsmentioning

confidence: 99%

Reinforcing effect of cross baffles on mass transfer process in raceway photobioreactors

Zhang

Dou

et al. 2023

Asia-Pacific J Chem Eng

View full text Add to dashboard Cite

Adding baffles inside raceway photobioreactors is a method to strengthen mixing. In this paper, a new type of staggered baffles are designed and compared with other structural baffles. Computational fluid dynamics was used to analyze the mixing effect of baffles with different structures in the raceway photobioreactors. The light–dark cycle of the staggered baffles was analyzed by coupling the motion trajectories of dynamical proton model particles through the change of outdoor light intensity during the day. The light–dark cycle of the cross baffle was analyzed according to the change of outdoor light intensity during the daytime coupled with the motion curve of dynamical proton model particles. The mixing ability of the staggered baffles was verified by mixing time, mass transfer coefficient, and outdoor cultivation. The results show that when the speed of the paddlewheel reached 20 rpm, compared with the raceway photobioreactors without baffles, vorticity increased by 23.3% respectively; the light–dark cycle period reduced by 18%; the mixing time reduced by 40%, and the mass transfer coefficient increased by 9.67%, the biomass of Chlorella increased by 25.3%. Compared with the other two baffle structures, the light–dark cycle period was reduced by 7.3% and 5.9%, the mixing time was reduced by 15% and 8%, and the mass transfer coefficient was increased by 1.17% and 3.59%. The biomass increased by 8.3% and 4.8%. The staggered baffles have better mass transfer performance, which can provide a reference for the optimal design of raceway photobioreactors.

show abstract

Section: Resultsmentioning

confidence: 99%

Reinforcing effect of cross baffles on mass transfer process in raceway photobioreactors

Zhang

Dou

et al. 2023

Asia-Pacific J Chem Eng

View full text Add to dashboard Cite

show abstract

“…Similarly, an innovative spiral-ascending CO 2 dissolver was established to enhance the CO 2 mass transfer and extend gas−liquid contact time. This tubular PBR design markedly improved biomass accumulation by 40.8% ( Xu et al, 2020 ).…”

Section: Microalgal Biomass Manufacturing Technologymentioning

confidence: 99%

Microalgal Biomass as Feedstock for Bacterial Production of PHA: Advances and Future Prospects

Tan

Nadir

Sudesh

2022

Front. Bioeng. Biotechnol.

View full text Add to dashboard Cite

The search for biodegradable plastics has become the focus in combating the global plastic pollution crisis. Polyhydroxyalkanoates (PHAs) are renewable substitutes to petroleum-based plastics with the ability to completely mineralize in soil, compost, and marine environments. The preferred choice of PHA synthesis is from bacteria or archaea. However, microbial production of PHAs faces a major drawback due to high production costs attributed to the high price of organic substrates as compared to synthetic plastics. As such, microalgal biomass presents a low-cost solution as feedstock for PHA synthesis. Photoautotrophic microalgae are ubiquitous in our ecosystem and thrive from utilizing easily accessible light, carbon dioxide and inorganic nutrients. Biomass production from microalgae offers advantages that include high yields, effective carbon dioxide capture, efficient treatment of effluents and the usage of infertile land. Nevertheless, the success of large-scale PHA synthesis using microalgal biomass faces constraints that encompass the entire flow of the microalgal biomass production, i.e., from molecular aspects of the microalgae to cultivation conditions to harvesting and drying microalgal biomass along with the conversion of the biomass into PHA. This review discusses approaches such as optimization of growth conditions, improvement of the microalgal biomass manufacturing technologies as well as the genetic engineering of both microalgae and PHA-producing bacteria with the purpose of refining PHA production from microalgal biomass.

show abstract

“…recently adapted a helical baffle in a horizontal tubular PBR to increase CO 2 dissolution rate by intensified gas–liquid mixing. This baffle provides an ascending spiral‐flow pattern, enhancing CO 2 mass transfer and leading to increased microalgal biomass production 42 . Based on the small diameter of the tubes of the reactor and the high irradiance, photoinhibition is a commonly occurring phenomenon 43 .…”

Section: Photobioreactors For Microalgae Cultivationmentioning

confidence: 99%

“…This baffle provides an ascending spiral-flow pattern, enhancing CO 2 mass transfer and leading to increased microalgal biomass production. 42 Based on the small diameter of the tubes of the reactor and the high irradiance, photoinhibition is a commonly occurring phenomenon. 43 On increasing the diameter or scaling up the reactor, the surface-to-volume ratio decreases.…”

Section: Tubular Photobioreactorsmentioning

confidence: 99%

Microalgae cultivation: photobioreactors, CO₂ utilization, and value‐added products of industrial importance

Shekh

Sharma

Schenk

et al. 2021

J of Chemical Tech & Biotech

View full text Add to dashboard Cite

Increasing world population, industrialization, and economic development demand more energy at a global scale, and this challenge is being met with the exploitation of fossil fuels that cause CO2 and CH4 emissions and contribute towards earth's rising temperature. Microalgae are considered potential sources for CO2 abatement and for combating food insecurity by ensuring a nutritional food supply for the sustainable living of an increasing population. The CO2 utilization potential of microalgae has been continuously researched for augmentation through various photobioreactor and open raceway pond designs and developments. Apart from recognition for their nutritional importance, microalgae are finding the place in the market as ‘functional foods’ due to their bioactive components. In view of this, the present study highlights the status and current attempts being made for photobioreactor development, CO2 sequestration, and the production of industrially important microalgal metabolites. This review also explains the factors responsible for microalgal growth and provides research needs and recommendations to make microalgal CO2 sequestration and value‐added compounds production an industrially competitive process. © 2021 Society of Chemical Industry (SCI).

show abstract

Developing a Spiral-Ascending CO₂ Dissolver to Enhance CO₂ Mass Transfer in a Horizontal Tubular Photobioreactor for Improved Microalgal Growth

Cited by 31 publications

References 45 publications

Reinforcing effect of cross baffles on mass transfer process in raceway photobioreactors

Reinforcing effect of cross baffles on mass transfer process in raceway photobioreactors

Microalgal Biomass as Feedstock for Bacterial Production of PHA: Advances and Future Prospects

Microalgae cultivation: photobioreactors, CO₂ utilization, and value‐added products of industrial importance

Contact Info

Product

Resources

About

Developing a Spiral-Ascending CO2 Dissolver to Enhance CO2 Mass Transfer in a Horizontal Tubular Photobioreactor for Improved Microalgal Growth

Cited by 31 publications

References 45 publications

Reinforcing effect of cross baffles on mass transfer process in raceway photobioreactors

Reinforcing effect of cross baffles on mass transfer process in raceway photobioreactors

Microalgal Biomass as Feedstock for Bacterial Production of PHA: Advances and Future Prospects

Microalgae cultivation: photobioreactors, CO2 utilization, and value‐added products of industrial importance

Contact Info

Product

Resources

About

Developing a Spiral-Ascending CO₂ Dissolver to Enhance CO₂ Mass Transfer in a Horizontal Tubular Photobioreactor for Improved Microalgal Growth

Microalgae cultivation: photobioreactors, CO₂ utilization, and value‐added products of industrial importance