Strengthening mass transfer of carbon dioxide microbubbles dissolver in a horizontal tubular photo-bioreactor for improving microalgae growth

Cheng, Jun; Xu, Junchen; Ye, Qing; Lai, Xin; Zhang, Xiangdong; Zhou, Junhu

doi:10.1016/j.biortech.2019.01.019

Cited by 36 publications

(14 citation statements)

References 34 publications

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“…Much effort was made to identify the best method to prevent overheating of cultures in large-scale settings. The typical approach is using water sprays to sprinkle the surface of the photobioreactors with heated or cooled liquid but this is only suitable for sites of low air humidity ( Cheng et al, 2019b ). Heat exchangers are also widely employed to dissipate excess heat to large water bodies.…”

Section: Optimization Of Microalgal Growth Conditionsmentioning

confidence: 99%

“…Novel photobioreactors designs have considered these factors when integrating technologies to increase CO 2 utilization efficiency. Some examples include the jet-aerated tangential swirling-flow plate photobioreactor ( Cheng et al, 2019a ) that condenses bubble diameter and CO 2 microbubbles dissolver (CMD) ( Cheng et al, 2019b ) that facilitates dissolved CO 2 in photobioreactors.…”

Section: Optimization Of Microalgal Growth Conditionsmentioning

confidence: 99%

“…Open ponds are exposed to the environment and are thus vulnerable to contamination. To combat this, microalgae strains that require specific environments are preferred such as A. platensis that thrive in extreme alkaline states or D. salina that can tolerate high salinity ( Cheng et al, 2019b ). Organic pollutants and unwanted microbes can also be removed via solar photo-Fenton by employing iron and hydrogen peroxide to irradiate water ( Polo-López and Pérez, 2021 ).…”

Section: Microalgal Biomass Manufacturing Technologymentioning

confidence: 99%

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

Tan

Nadir

Sudesh

2022

Front. Bioeng. Biotechnol.

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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.

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Section: Optimization Of Microalgal Growth Conditionsmentioning

confidence: 99%

Section: Optimization Of Microalgal Growth Conditionsmentioning

confidence: 99%

Section: Microalgal Biomass Manufacturing Technologymentioning

confidence: 99%

See 1 more Smart Citation

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

Tan

Nadir

Sudesh

2022

Front. Bioeng. Biotechnol.

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“…These scale-up strategies are challenging because maintaining optimum light, temperature, mixing, and mass transfer in photobioreactors at large volumes is difficult [ 10 , 11 , 12 , 13 , 14 ]. The overall mass transfer coefficient (k L a) is the most commonly used parameter for evaluating photobioreactor performance and improving microalgae productivity [ 11 , 15 , 16 , 17 , 18 ]. Commonly, the k L a has been used as a scaling-up parameter in heterotrophic culture systems (i.e., bacteria and yeasts).…”

Section: Introductionmentioning

confidence: 99%

Implementation of kLa-Based Strategy for Scaling Up Porphyridium purpureum (Red Marine Microalga) to Produce High-Value Phycoerythrin, Fatty Acids, and Proteins

et al. 2021

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Porphyridium purpureum is a well-known Rhodophyta that recently has attracted enormous attention because of its capacity to produce many high-value metabolites such as the pigment phycoerythrin and several high-value fatty acids. Phycoerythrin is a fluorescent red protein-pigment commercially relevant with antioxidant, antimicrobial activity, and fluorescent properties. The volumetric mass transfer coefficient (kLa) was kept constant within the different scaling-up stages in the present study. This scaling-up strategy was sought to maintain phycoerythrin production and other high-value metabolites by Porphyridium purpureum, using hanging-bag photobioreactors. The kLa was monitored to ensure the appropriate mixing and CO2 diffusion in the entire culture during the scaling process (16, 80, and 400 L). Then, biomass concentration, proteins, fatty acids, carbohydrates, and phycoerythrin were determined in each step of the scaling-up process. The kLa at 16 L reached a level of 0.0052 s−1, while at 80 L, a value of 0.0024 s−1 was achieved. This work result indicated that at 400 L, 1.22 g L−1 of biomass was obtained, and total carbohydrates (117.24 mg L−1), proteins (240.63 mg L−1), and lipids (17.75% DW) were accumulated. Regarding fatty acids production, 46.03% palmitic, 8.03% linoleic, 22.67% arachidonic, and 2.55% eicosapentaenoic acid were identified, principally. The phycoerythrin production was 20.88 mg L−1 with a purity of 2.75, making it viable for food-related applications. The results of these experiments provide insight into the high-scale production of phycoerythrin via the cultivation of P. purpureum in an inexpensive and straightforward culture system.

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“…Gaseous CO 2 is one of the essential elements for microalgal photosynthesis, which is delivered into the photobioreactor in the form of bubbles through the CO 2 dissolver using various gas aeration systems. For example, ceramic aerators can be applied in the CO 2 dissolver to efficiently generate small bubbles for accelerated CO 2 dissolution . Acién Fernández et al developed the gas aeration system in an airlift device, which served to circulate the microalgal solution and remove the accumulated oxygen from the horizontal tubular photobioreactors.…”

Section: Introductionmentioning

confidence: 99%

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

Cheng

Xin

et al. 2020

ACS Sustainable Chem. Eng.

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In order to enhance the CO 2 dissolution rate and prolong gas− liquid contact time to improve microalgal growth, a spiral-ascending CO 2 dissolver was developed to enhance CO 2 mass transfer in a horizontal tubular photobioreactor. A spiral-ascending flow pattern of CO 2 bubbles was formed with a helical baffle and central hollow tube in the CO 2 dissolver, which markedly extended flow trajectory of CO 2 bubbles and intensified the mixing effect. This novel CO 2 dissolver with the helical baffle shortened the bubble generation time by 30.6% and decreased the bubble generation diameter by 23.4%, thereby enhancing the mass transfer coefficient by 69.2%. The bubble retention time dramatically increased by 190.2%, which prolonged CO 2 gas−liquid contact time to enhance dissolved CO 2 concentration. The liquid phase mixing time decreased by 15.8% to give a uniform status in microalgal suspension, allowing for sufficient nutrient supply for photosynthesis during microalgal circulation in horizontal tubes. This led to an increased microalgal biomass accumulation by 40.8% with 15% CO 2 in the horizontal tubular photobioreactor.

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Strengthening mass transfer of carbon dioxide microbubbles dissolver in a horizontal tubular photo-bioreactor for improving microalgae growth

Cited by 36 publications

References 34 publications

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

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

Implementation of kLa-Based Strategy for Scaling Up Porphyridium purpureum (Red Marine Microalga) to Produce High-Value Phycoerythrin, Fatty Acids, and Proteins

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

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Strengthening mass transfer of carbon dioxide microbubbles dissolver in a horizontal tubular photo-bioreactor for improving microalgae growth

Cited by 36 publications

References 34 publications

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

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

Implementation of kLa-Based Strategy for Scaling Up Porphyridium purpureum (Red Marine Microalga) to Produce High-Value Phycoerythrin, Fatty Acids, and Proteins

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

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