Minimizing carbon footprint via microalgae as a biological capture

Onyeaka, Helen; Miri, Taghi; Obileke, KeChrist; Hart, Abarasi; Anumudu, Christian; Al‐Sharify, Zainab T.

doi:10.1016/j.ccst.2021.100007

Cited by 186 publications

(42 citation statements)

References 131 publications

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“…The microalgal production systems do not directly compete with the food chain. Furthermore, they can be used to convert CO 2 to oxygen or for wastewater treatment [ 8 , 9 , 10 , 11 ].…”

Section: Introductionmentioning

confidence: 99%

Fe3O4-PEI Nanocomposites for Magnetic Harvesting of Chlorella vulgaris, Chlorella ellipsoidea, Microcystis aeruginosa, and Auxenochlorella protothecoides

Gerulová¹,

Kucmanová²,

Sanny³

et al. 2022

Nanomaterials

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Magnetic separation of microalgae using magnetite is a promising harvesting method as it is fast, reliable, low cost, energy-efficient, and environmentally friendly. In the present work, magnetic harvesting of three green algae (Chlorella vulgaris, Chlorella ellipsoidea, and Auxenochlorella protothecoides) and one cyanobacteria (Microcystis aeruginosa) has been studied. The biomass was flushed with clean air using a 0.22 μm filter and fed CO2 for accelerated growth and faster reach of the exponential growth phase. The microalgae were harvested with magnetite nanoparticles. The nanoparticles were prepared by controlled co-precipitation of Fe2+ and Fe3+ cations in ammonia at room temperature. Subsequently, the prepared Fe3O4 nanoparticles were coated with polyethyleneimine (PEI). The prepared materials were characterized by high-resolution transmission electron microscopy, X-ray diffraction, magnetometry, and zeta potential measurements. The prepared nanomaterials were used for magnetic harvesting of microalgae. The highest harvesting efficiencies were found for PEI-coated Fe3O4. The efficiency was pH-dependent. Higher harvesting efficiencies, up to 99%, were obtained in acidic solutions. The results show that magnetic harvesting can be significantly enhanced by PEI coating, as it increases the positive electrical charge of the nanoparticles. Most importantly, the flocculants can be prepared at room temperature, thereby reducing the production costs.

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“…The microalgal production systems do not directly compete with the food chain. Furthermore, they can be used to convert CO 2 to oxygen or for wastewater treatment [ 8 , 9 , 10 , 11 ].…”

Section: Introductionmentioning

confidence: 99%

Fe3O4-PEI Nanocomposites for Magnetic Harvesting of Chlorella vulgaris, Chlorella ellipsoidea, Microcystis aeruginosa, and Auxenochlorella protothecoides

Gerulová¹,

Kucmanová²,

Sanny³

et al. 2022

Nanomaterials

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“…Another point of interest for CO 2 sequestration using microalgae is their powerful environmental flexibility since they can tolerate and adapt to various extreme environmental conditions ( Moreira and Pires, 2016 ; Onyeaka et al, 2021 ). Consequently, microalgae can play an important role in removing contaminants from wastewater from industries and agricultural activities that simultaneously produce high value-added products resulting in economic feasibility ( Razzak et al, 2017 ; Paul et al, 2021 ).…”

Section: Microalgae To Couple Wastewater Treatment With Microalgae Fo...mentioning

confidence: 99%

Microalgae-based wastewater treatment for developing economic and environmental sustainability: Current status and future prospects

Srimongkol

Sangtanoo

Songserm

et al. 2022

Front. Bioeng. Biotechnol.

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Over the last several decades, concerns about climate change and pollution due to human activity has gained widespread attention. Microalgae have been proposed as a suitable biological platform to reduce carbon dioxide, a major greenhouse gas, while also creating commercial sources of high-value compounds such as medicines, cosmetics, food, feed, and biofuel. Industrialization of microalgae culture and valorization is still limited by significant challenges in scaling up the production processes due to economic constraints and productivity capacities. Therefore, a boost in resource usage efficiency is required. This enhancement not only lowers manufacturing costs but also enhancing the long-term viability of microalgae-based products. Using wastewater as a nutrient source is a great way to reduce manufacturing costs. Furthermore, water scarcity is one of the most important global challenges. In recent decades, industrialization, globalization, and population growth have all impacted freshwater resources. Moreover, high amounts of organic and inorganic toxins in the water due to the disposal of waste into rivers can have severe impacts on human and animal health. Microalgae cultures are a sustainable solution to tertiary and quaternary treatments since they have the ability to digest complex contaminants. This review presents biorefineries based on microalgae from all angles, including the potential for environmental pollution remediation as well as applications for bioenergy and value-added biomolecule production. An overview of current information about microalgae-based technology and a discussion of the associated hazards and opportunities for the bioeconomy are highlighted.

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“…Based on Equation (11) one ton of carbon dioxide will require 182 kg of hydrogen to generate 363 kg of methane. The second way is designated as "Green Methane from Microalgae" and entails the use of the carbon dioxide to grow microalgae, which are in turn harvested and converted via AD to obtain biogas [34]. The biogas is then separated into green methane and carbon dioxide which is recycled in the same fashion.…”

Section: Grey Methane Blue Methane and Green Methanementioning

confidence: 99%

The Renewable Hydrogen–Methane (RHYME) Transportation Fuel: A Practical First Step in the Realization of the Hydrogen Economy

Ingersoll¹

2022

Hydrogen

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The permanent introduction of green hydrogen into the energy economy would require that a discriminating selection be made of its use in the sectors where its value is optimal in terms of relative cost and life cycle reduction in carbon dioxide emissions. Consequently, hydrogen can be used as an energy storage medium when intermittent wind and solar power exceed certain penetration in the grid, likely above 40%, and in road transportation right away, to begin displacing gasoline and diesel fuels. To this end, the proposed approach is to utilize current technologies represented by PHEV in light-duty and HEV in heavy-duty vehicles, where a high-performance internal combustion engine is used with a fuel comprised of 15–20% green hydrogen and 85–89% green methane depending on vehicle type. This fuel, designated as RHYME, takes advantage of the best attributes of hydrogen and methane, results in lower life cycle carbon dioxide emissions than BEVs or FCEVs and offers a cost-effective and pragmatic approach, both locally as well as globally, in establishing hydrogen as part of the energy economy over the next ten to thirty years.

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Minimizing carbon footprint via microalgae as a biological capture

Cited by 186 publications

References 131 publications

Fe3O4-PEI Nanocomposites for Magnetic Harvesting of Chlorella vulgaris, Chlorella ellipsoidea, Microcystis aeruginosa, and Auxenochlorella protothecoides

Fe3O4-PEI Nanocomposites for Magnetic Harvesting of Chlorella vulgaris, Chlorella ellipsoidea, Microcystis aeruginosa, and Auxenochlorella protothecoides

Microalgae-based wastewater treatment for developing economic and environmental sustainability: Current status and future prospects

The Renewable Hydrogen–Methane (RHYME) Transportation Fuel: A Practical First Step in the Realization of the Hydrogen Economy

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