Efficient CO2 capture from the air for high microalgal biomass production by a bicarbonate Pool

Zhu, Chenba; Zhai, Xiaoqian; Xi, Yimei; Wang, Jinghan; Kong, Fantao; Zhao, Yunpeng; Chi, Zhanyou

doi:10.1016/j.jcou.2019.12.023

Cited by 56 publications

(24 citation statements)

References 54 publications

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“…These results indicated that 0.42 g L −1 NaHCO 3 with 2% CO 2 was the optimal carbon source for biomass production and CO 2 fixation, which was consistent with the previous reports that the highest biomass productivity (0.14 g L −1 d −1 ) of C. vulgaris was achieved under 5 mmol L −1 NaHCO 3 with 5% CO 2 as the carbon source ( Lohman et al, 2015 ). More encouragingly, compared to the latest reports so far, R CO2 (544.21 mg L −1 d −1 ) obtained in the shake flasks was superior to that of 360.12 mg L −1 d −1 for Chlorella fusca ( Zhu et al, 2020 ), 350.0 mg L −1 d −1 for Scenedesmus sp. ( Rodas-Zuluaga et al, 2021 ), 470.0 mg L −1 d −1 for Chlorella sp.…”

Section: Resultssupporting

confidence: 54%

“…In addition to DIC, the most stable pH in the medium was also observed under the optimal carbon source (0.42 g L −1 NaHCO 3 and 2% CO 2 ) with the minimum pH fluctuation at 1.15, compared to 1.47 in the control and around 1.94 in the other two cultures ( Figure 1C ). It was reported that bubbled CO 2 captured by the hybrid carbon source (NaHCO 3 and CO 2 ) and stored as HCO 3 − could drop the pH value in the medium and weaken the effect of pH rise resulting in nitrate and HCO 3 − consumption via algal cell growth ( Wang et al, 2018 ; Zhu et al, 2020 ). When HCO 3 − is utilized, OH − can be released and then recycled to capture subsequent CO 2 to form bicarbonate again ( Gardner et al, 2012 ).…”

Section: Resultsmentioning

confidence: 99%

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Oleaginous Microalga Coccomyxa subellipsoidea as a Highly Effective Cell Factory for CO2 Fixation and High-Protein Biomass Production by Optimal Supply of Inorganic Carbon and Nitrogen

Liu

Wei²,

Chen³

2022

Front. Bioeng. Biotechnol.

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Microalgae used for CO2 biofixation can effectively relieve CO2 emissions and produce high-value biomass to achieve “waste-to-treasure” bioconversion. However, the low CO2 fixation efficiency and the restricted application of biomass are currently bottlenecks, limiting the economic viability of CO2 biofixation by microalgae. To achieve high-efficient CO2 fixation and high-protein biomass production, the oleaginous microalga Coccomyxa subellipsoidea (C. subellipsoidea) was cultivated autotrophically through optimizing inorganic carbon and nitrogen supply. 0.42 g L−1 NaHCO3 supplemented with 2% CO2 as a hybrid carbon source resulted in high biomass concentration (3.89 g L−1) and productivity (318.33) with CO2 fixation rate 544.21 mg L−1 d−1 in shake flasks. Then, used in a 5-L photo-fermenter, the maximal protein content (60.93% DW) in batch 1, and the highest CO2 fixation rate (1043.95 mg L−1 d−1) with protein content (58.48% DW) in batch 2 of repeated fed-batch cultures were achieved under 2.5 g L−1 nitrate. The relative expression of key genes involved in photosynthesis, glycolysis, and protein synthesis showed significant upregulation. This study developed a promising approach for enhancing carbon allocation to protein synthesis in oleaginous microalga, facilitating the bioconversion of the fixed carbon into algal protein instead of oil in green manufacturing.

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Section: Resultssupporting

confidence: 54%

Section: Resultsmentioning

confidence: 99%

Oleaginous Microalga Coccomyxa subellipsoidea as a Highly Effective Cell Factory for CO2 Fixation and High-Protein Biomass Production by Optimal Supply of Inorganic Carbon and Nitrogen

Liu

Wei²,

Chen³

2022

Front. Bioeng. Biotechnol.

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“…In this situation, carbon supply and mixing cannot be decoupled. Compared with CO 2 gas, a high concentration of bicarbonate can supply sufficient carbon for microalgae growth , and continuous mixing may not be obligate. For instance, the mixing in floating PBRs that use bicarbonate as the sole carbon source can use intermittent wave energy as the driving force. , Therefore, a periodical mixing mode may support good growth of microalgae, which may greatly reduce the mixing cost.…”

Section: Introductionmentioning

confidence: 99%

Cost-Effective and Efficient Production of Carbohydrates from an Alkalihalophilic Leptolyngbya sp. in a Photobioreactor with Periodical Mixing

Zhu

Che²,

Zhai

et al. 2020

ACS Sustainable Chem. Eng.

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Using sodium bicarbonate (NaHCO3) as the carbon source makes it possible to decouple mixing and carbon supply in microalgae cultivation, and a periodical mixing may be sufficient to support rapid microalgae growth. To test this idea, growth of a screened Leptolyngbya sp. DUT 001 cultured with NaHCO3 was evaluated in a bubbling column photobioreactor. First, the culture medium of this strain was optimized as 25.2 g L–1 NaHCO3 and 0.5 g L–1 NaNO3, in which condition the achieved highest biomass productivity and carbohydrate content were 0.74 g L–1 d–1 and 75.7 ± 1.3%, respectively. Second, the effect of four periodical mixing modes of 6:2, 6:4, 6:6, and 6:10 (bubbling/stopping, s) on microalgae growth was investigated, and these cultures resulted in the highest biomass concentrations of 1.76 ± 0.03, 1.75 ± 0.04, 1.72 ± 0.05, and 1.66 ± 0.04 g L–1, respectively. Correspondingly, the highest carbohydrate contents were 56.5 ± 1.2, 63.0 ± 2.5, 64.7 ± 2.1, and 60.6 ± 2.5%, respectively. However, there was no significant difference between these values and those achieved in the control group with continuous mixing (P > 0.05), which was 1.82 ± 0.06 g L–1 and 59.3 ± 1.3%, respectively. These results showed that it is feasible to use periodical mixing in microalgae cultivation, which may significantly reduce the microalgae biomass production cost.

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“…89 Microalgae can survive in saline, alkaline and waste water, but high pH conditions increase the gas-liquid mass transfer rate of CO 2 and biomass productivity, potentially increasing the feasibility of DAC (e.g., in nature, soda lakes encourage such microalgae processes). 333,334 Suspension-based techniques, e.g., open ponds or photobioreactors, can have large land, water, energy and maintenance requirements, and significant gas-liquid mass transfer limitations. Open pond systems, however, are easily scalable and offer lower costs and energy requirements than alternative arrangements, with such an approach being piloted by Global Algae (Table 1).…”

Section: Assessment Of Alternative Processes For Direct Air Capturementioning

confidence: 99%

Direct air capture: process technology, techno-economic and socio-political challenges

Erans

Sanz-Pérez

Hanak

et al. 2022

Energy Environ. Sci.

232

169

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Efficient CO2 capture from the air for high microalgal biomass production by a bicarbonate Pool

Cited by 56 publications

References 54 publications

Oleaginous Microalga Coccomyxa subellipsoidea as a Highly Effective Cell Factory for CO2 Fixation and High-Protein Biomass Production by Optimal Supply of Inorganic Carbon and Nitrogen

Oleaginous Microalga Coccomyxa subellipsoidea as a Highly Effective Cell Factory for CO2 Fixation and High-Protein Biomass Production by Optimal Supply of Inorganic Carbon and Nitrogen

Cost-Effective and Efficient Production of Carbohydrates from an Alkalihalophilic Leptolyngbya sp. in a Photobioreactor with Periodical Mixing

Direct air capture: process technology, techno-economic and socio-political challenges

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