Enhanced CO2 bio-utilization with a liquid–liquid membrane contactor in a bench-scale microalgae raceway pond

Xu, Xiaoyin; Martin, Gael M.; Kentish, Sandra E.

doi:10.1016/j.jcou.2019.06.008

Cited by 22 publications

(5 citation statements)

References 40 publications

(47 reference statements)

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“…The marine microalgal strain Nannochloropsis sp. was cultivated in presence of CO 2 delivered through semipermeable membranes along with chemical solvent with biomass productivity of 0.10 g L −1 day −1 [ 65 ]. Biomass productivity of C. pyrenoidosa obtained in both the nanoemulsions in the present study was significantly higher than the reported results.…”

Section: Resultsmentioning

confidence: 99%

A novel nanoemulsion-based microalgal growth medium for enhanced biomass production

Nigam¹,

Pant²,

Singh

2021

Biotechnol Biofuels

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Background Microalgae are well-established feedstocks for applications ranging from biofuels to valuable pigments and therapeutic proteins. However, the low biomass productivity using commercially available growth mediums is a roadblock for its mass production. This work describes a strategy to boost algal biomass productivity by using an effective CO2 supplement. Results In the present study, a novel nanoemulsion-based media has been tested for the growth of freshwater microalgae strain Chlorella pyrenoidosa. Two different nanoemulsion-based media were developed using 1% silicone oil nanoemulsion (1% SE) and 1% paraffin oil nanoemulsion (1% PE) supplemented in Blue-green 11 media (BG11). After 12 days of cultivation, biomass yield was found highest in 1% PE followed by 1% SE and control, i.e., 3.20, 2.75, and 1.03 g L−1, respectively. The chlorophyll-a synthesis was improved by 76% in 1% SE and 53% in 1% PE compared with control. The respective microalgal cell numbers for 1% PE, 1% SE and control measured using the cell counter were 3.00 × 106, 2.40 × 106, and 1.34 × 106 cells mL−1. The effective CO2 absorption tendency of the emulsion was highlighted as the key mechanism for enhanced algal growth and biomass production. On the biochemical characterization of the produced biomass, it was found that the nanoemulsion-cultivated C. pyrenoidosa had increased lipid (1% PE = 26.80%, 1% SE = 23.60%) and carbohydrates (1% PE = 17.20%, 1% SE = 18.90%) content compared to the control (lipid = 18.05%, carbohydrates = 13.60%). Conclusions This study describes a novel nanoemulsion which potentially acts as an effective CO2 supplement for microalgal growth media thereby increasing the growth of microalgal cells. Further, nanoemulsion-cultivated microalgal biomass depicts an increase in lipid and carbohydrate content. The approach provides high microalgal biomass productivity without altering morphological characteristics like cell shape and size as revealed by field emission scanning electron microscope (FESEM) images. Graphical abstract

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Section: Resultsmentioning

confidence: 99%

A novel nanoemulsion-based microalgal growth medium for enhanced biomass production

Nigam¹,

Pant²,

Singh

2021

Biotechnol Biofuels

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“…Pond channels can be produced from a wide variety of products from concrete to soil. The grown microalgae enter the impeller as if from the rear, and the impeller captures the biomass [51][52][53][54][55]. The second way of cultivating microalgae is bioreactors (Figure 3).…”

Section: Algae Cultivation Methodsmentioning

confidence: 99%

Industrial CO2 Capture by Algae: A Review and Recent Advances

2022

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The problem of global warming and the emission of greenhouse gases is already directly affecting the world’s energy. In the future, the impact of CO2 emissions on the world economy will constantly grow. In this paper, we review the available literature sources on the benefits of using algae cultivation for CO2 capture to decrease CO2 emission. CO2 emission accounts for about 77% of all greenhouse gases, and the calculation of greenhouse gas emissions is 56% of all CO2 imports. As a result of the study of various types of algae, it was concluded that Chlorella sp. is the best at capturing CO2. Various methods of cultivating microalgae were also considered and it was found that vertical tubular bioreactors are emerging. Moreover, for energy purposes, thermochemical methods for processing algae that absorb CO2 from flue gases were considered. Of all five types of thermochemical processes for producing synthesis gas, the most preferred method is the method of supercritical gasification of algae. In addition, attention is paid to the drying and flocculation of biofuels. Several different experiments were also reviewed on the use of flue gases through the cultivation of algae biomass. Based on this literature review, it can be concluded that microalgae are a third generation biofuel. With the absorption of greenhouse gases, the growth of microalgae cultures is accelerated. When a large mass of microalgae appears, it can be used for energy purposes. In the results, we present a plan for further studies of microalgae cultivation, a thermodynamic analysis of gasification and pyrolysis, and a comparison of the results with other biofuels and other algae cultures.

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“…In most experiments, microalgae were grown in 200 mL Schott bottles, magnetically stirred at 100 rpm. Since largescale outdoor microalgae production is commonly performed in a raceway pond, a 10 L raceway pond detailed in our previous work 10 was also used as a further demonstration. In both cases, the algae culture was diluted to 0.05 g/L with the MF medium at the start of each cultivation period.…”

Section: ■ Materials and Methodsmentioning

confidence: 99%

“…However, the high energy penalty of CO 2 capture, CO 2 compression, transport, and sparging is yet to be solved. In our previous work, a liquid–liquid membrane contactor was investigated to deliver dissolved CO 2 to the microalgae culture via semipermeable membranes . Although this technique saved the energy cost of CO 2 compression and sparging, CO 2 was still required to be captured and transported from a capture plant.…”

Section: Introductionmentioning

confidence: 99%

Direct Air Capture of CO₂ by Microalgae with Buoyant Beads Encapsulating Carbonic Anhydrase

Kentish

Martin

2021

ACS Sustainable Chem. Eng.

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Microalgae cultures have promise as a CO2 sink for atmospheric carbon and as a sustainable source of food and chemical feedstocks. However, large-scale microalgae cultivation is currently limited by the need to provide carbon dioxide from point sources, as the diffusion of atmospheric CO2 is too slow. Carbonic anhydrase (CA) is an effective enzyme to facilitate the dissolution of atmospheric CO2 that could be used to enhance the photosynthetic uptake of this greenhouse gas. Here we investigate a means of retaining CA at the surface of algae ponds to facilitate direct air capture by cross-linking CA with glutaraldehyde (GA) before encapsulation into buoyant calcium alginate beads. Coomassie Blue dyeing and Wilbur–Anderson assays confirmed the successful bonding of CA to the beads. Microscopic images showed the paraffin-embedded alginate framework. The CA–GA beads retain virtually all hydrase activity throughout 10 assay cycles. Compared with a natural growth rate of 22.7 ± 0.5 mg L–1 day–1, free CA and CA–GA beads increased the productivity of Nannochloropsis salina to 37 ± 3 mg L–1 day–1 and 40 ± 1 mg L–1 day–1, respectively. The CA–GA beads further provided a stable growth enhancement for three rounds of microalgae cultivation, confirming that these buoyant beads can be readily recovered and re-used, which is promising for industrial biomass production.

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Enhanced CO2 bio-utilization with a liquid–liquid membrane contactor in a bench-scale microalgae raceway pond

Cited by 22 publications

References 40 publications

A novel nanoemulsion-based microalgal growth medium for enhanced biomass production

A novel nanoemulsion-based microalgal growth medium for enhanced biomass production

Industrial CO2 Capture by Algae: A Review and Recent Advances

Direct Air Capture of CO₂ by Microalgae with Buoyant Beads Encapsulating Carbonic Anhydrase

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Enhanced CO2 bio-utilization with a liquid–liquid membrane contactor in a bench-scale microalgae raceway pond

Cited by 22 publications

References 40 publications

A novel nanoemulsion-based microalgal growth medium for enhanced biomass production

A novel nanoemulsion-based microalgal growth medium for enhanced biomass production

Industrial CO2 Capture by Algae: A Review and Recent Advances

Direct Air Capture of CO2 by Microalgae with Buoyant Beads Encapsulating Carbonic Anhydrase

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Product

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Direct Air Capture of CO₂ by Microalgae with Buoyant Beads Encapsulating Carbonic Anhydrase