Microalgae cultivation for carbon dioxide sequestration and protein production using a high-efficiency photobioreactor system

Pavlik, David; Zhong, Yingkui; Daiek, Carly; Liao, Wei; Morgan, Robert P.; Clary, William; Liu, Yan

doi:10.1016/j.algal.2017.06.003

Cited by 66 publications

(10 citation statements)

References 27 publications

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“…Microalgae are unicellular organisms that can be grown both in open water and enclosed systems (photobioreactors) [ 1 ]. Certain microalgae are fast-growing carbon fixers, and when grown in large enough quantities sequester CO 2 [ 2 ]. Microalgal biomass is often rich in lipids, protein content and various bioactive components, such as pigments, flavonoids and (poly)phenolics.…”

Section: Introductionmentioning

confidence: 99%

Microwave-Assisted Defibrillation of Microalgae

et al. 2021

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The first production of defibrillated celluloses from microalgal biomass using acid-free, TEMPO-free and bleach-free hydrothermal microwave processing is reported. Two routes were explored: i. direct microwave process of native microalgae (“standard”), and ii. scCO2 pre-treatment followed by microwave processing. ScCO2 was investigated as it is commonly used to extract lipids and generates considerable quantities of spent algal biomass. Defibrillation was evidenced in both cases to afford cellulosic strands, which progressively decreased in their width and length as the microwave processing temperature increased from 160 °C to 220 °C. Lower temperatures revealed aspect ratios similar to microfibrillated cellulose whilst at the highest temperature (220 °C), a mixture of microfibrillated cellulose and nanocrystals were evidenced. XRD studies showed similar patterns to cellulose I but also some unresolved peaks. The crystallinity index (CrI), determined by XRD, increased with increasing microwave processing temperature. The water holding capacity (WHC) of all materials was approximately 4.5 g H2O/g sample. The materials were able to form partially stable hydrogels, but only with those processed above 200 °C and at a concentration of 3 wt% in water. This unique work provides a new set of materials with potential applications in the packaging, food, pharmaceutical and cosmetic industries.

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Section: Introductionmentioning

confidence: 99%

Microwave-Assisted Defibrillation of Microalgae

et al. 2021

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“…Although microalgae cultivation under heterotrophic and mixotrophic conditions has some advantages, this process is at risk of contamination with heterotrophic microbes because organic compounds are used as carbon and energy sources [ 22 ], and this leads to the release of carbon dioxide as one of the major greenhouse gases. The use of gaseous CO 2 as a carbon source by photoautotrophic microalgae contributes to sequestration of carbon dioxide, which is one way to reduce the risks that are associated with global warming [ 23 , 24 ]. Furthermore, when synthesis of the target products is the cell’s physiological response to high light stress, it is important to develop and apply effective strategies for photoautotrophic cultivation [ 10 ].…”

Section: Introductionmentioning

confidence: 99%

Comparison of the Photoautotrophic Growth Regimens of Chlorella sorokiniana in a Photobioreactor for Enhanced Biomass Productivity

Ziganshina

Bulynina

Ziganshin

2020

Biology

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Microalgae have a wide industrial potential because of their high metabolic diversity and plasticity. Selection of optimal cultivation methods is important to optimize multi-purpose microalgal biotechnologies. In this research, Chlorella sorokiniana AM-02 that was isolated from a freshwater lake was cultured under various high photosynthetic photon flux density (PPFD) conditions and CO2 gas levels in standard Bold’s basal medium (BBM). Furthermore, a wide range of nitrate levels (180–1440 mg L−1) was tested on the growth of C. sorokiniana. Microalgae growth, pigment concentration, medium pH, exit gas composition, as well as nitrate, phosphate, and sulfate levels were measured during an experimental period. The preferred high PPFD and optimal CO2 levels were found to be 1000–1400 μmol photons m−2 s−1 and 0.5–2.0% (v/v), respectively. The addition of nitrate ions (up to 1440 mg L−1) to the standard growth medium increased final optical density (OD750), cell count, pigment concentration, and total biomass yield but decreased the initial growth rate at high nitrate levels. Our findings can serve as the basis for a robust photoautotrophic cultivation system to maximize the productivity of large-scale microalgal cultures.

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“…We summarize the cost-determining parameters related to heterotrophic and phototrophic algal growth from the literature, − ,,− as shown in Figure B. Typically, the algal biomass productivity and terminal density of HC are 1–2 orders of magnitude higher than those of PC, enabling a much more compact cultivation system and easier harvesting for HC.…”

Section: Resultsmentioning

confidence: 99%

Microalgae Commercialization Using Renewable Lignocellulose Is Economically and Environmentally Viable

Wang

Zhang

et al. 2023

Environ. Sci. Technol.

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Conventional phototrophic cultivation for microalgae production suffers from low and unstable biomass productivity due to limited and unreliable light transmission outdoors. Alternatively, the use of a renewable lignocellulose-derived carbon source, cellulosic hydrolysate, offers a cost-effective and sustainable pathway to cultivate microalgae heterotrophically with high algal growth rate and terminal density. In this study, we evaluate the feasibility of cellulosic hydrolysate-mediated heterotrophic cultivation (Cel-HC) for microalgae production by performing economic and environmental comparisons with phototrophic cultivation through techno-economic analysis and life cycle assessment. We estimate a minimum selling price (MSP) of 4722 USD/t for producing high-purity microalgae through Cel-HC considering annual biomass productivity of 300 t (dry weight), which is competitive with the conventional phototrophic raceway pond system. Revenues from the lignocellulose-derived co-products, xylose and fulvic acid fertilizer, could further reduce the MSP to 2976 USD/t, highlighting the advantages of simultaneously producing high-value products and biofuels in an integrated biorefinery scheme. Further, Cel-HC exhibits lower environmental impacts, such as cumulative energy demand and greenhouse gas emissions, than phototrophic systems, revealing its potential to reduce the carbon intensity of algae-derived commodities. Our results demonstrate the economic and environmental competitiveness of heterotrophic microalgae production based on renewable bio-feedstock of lignocellulose.

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Microalgae cultivation for carbon dioxide sequestration and protein production using a high-efficiency photobioreactor system

Cited by 66 publications

References 27 publications

Microwave-Assisted Defibrillation of Microalgae

Microwave-Assisted Defibrillation of Microalgae

Comparison of the Photoautotrophic Growth Regimens of Chlorella sorokiniana in a Photobioreactor for Enhanced Biomass Productivity

Microalgae Commercialization Using Renewable Lignocellulose Is Economically and Environmentally Viable

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