Biomass of algae growth on natural water medium

Ramaraj, Rameshprabu; Tsai, David Dah-Wei; Chen, Paris Honglay

doi:10.1016/j.jphotobiol.2014.12.007

Cited by 22 publications

(10 citation statements)

References 32 publications

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“…The chlorophyll b content significantly ( p < 0.05) decreased at 0.001–1 mg/L GO-Ncs, 0.01–1 mg/L GO, and 1 mg/L Ncs over 96 h (Figure c). Chlorophyll a is the main photosynthetic pigment in algal cells, and chlorophyll b is considered as an accessory or secondary pigment. , There was an effect on chlorophyll b but not on chlorophyll a, implying that main pigment synthesis in the algal cells was not affected but that secondary pigment synthesis might have an impact on nanoparticles. The maximum quantum yield of photosystem II (PSII; Fv/Fm; Figure d) and the relative electron transport rate (rETR, Figure e) were not significantly different ( p > 0.05) between the Ncs or GO exposure and control groups.…”

Section: Resultsmentioning

confidence: 99%

Natural Nanocolloids Mediate the Phytotoxicity of Graphene Oxide

Ouyang

Zhou

Zeng

et al. 2020

Environ. Sci. Technol.

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Nanocolloids (Ncs) are ubiquitous in natural surface waters. However, the effects of Ncs on the fate and ecotoxicity of graphene oxide (GO, a popular engineered nanomaterial (ENM)) remain largely unknown. Ncs exhibit strong adsorption affinity (K L = 1.93 L/mg) and high adsorption capacity (176.2 mg/g) for GO. After Ncs hybridization, GO nanosheets became scrolls, and the aggregation rate of GO decreased. The influence of humic acid and Ncs on GO toxicity was compared. Humic acid mitigated the phytotoxicity of GO. However, GO and GO-Ncs were found to have an envelopment effect on algal cells, and both could enter algal cells. GO-Ncs induced higher reactive oxygen species (ROS) generation, stronger DNA damage and plasmolysis, and more obvious inhibition of photosynthesis compared to GO. Proteomic analysis revealed that photosystem I-and II-related proteins (e.g., E1ZQR2 and E1ZPG5) were regulated more significantly in the GO-Ncs groups than in the GO groups. A combined proteomic and metabolomic analysis showed that inhibition of carbohydrate, fatty acid, and amino acid metabolism contributed to ROS generation. Given the high concentrations and activity of Ncs, the above results highlight the need for reconsideration of the Ncs-mediated environmental behaviors and risks of ENMs and other pollutants.

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Section: Resultsmentioning

confidence: 99%

Natural Nanocolloids Mediate the Phytotoxicity of Graphene Oxide

Ouyang

Zhou

Zeng

et al. 2020

Environ. Sci. Technol.

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“…Cyanobacteria algae have a short growth cycle, rapid propagation, and a high carbon fixation rate. Growth of this algae is an efficient carbon fixation process, whereby a large volume of inorganic carbon is converted into organic carbon compounds and stored in its cells (Ramaraj, Tsai, & Chen, ). When the cells decompose after death, organic carbon is released into the water body.…”

Section: Introductionmentioning

confidence: 99%

A study on the relationship between metabolism of Cyanobacteria and chemical oxygen demand in Dianchi Lake, China

Zhang

et al. 2019

Water Environment Research

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Recent increases in concentrations of chemical oxygen demand (COD‐Cr) in Dianchi Lake, China, is an important factor affecting its water quality. Large volumes of cyanobacteria algae have also been recorded in this lake; its growth, distribution and metabolism are believed to directly or indirectly affect water quality. The relationship between metabolism of cyanobacteria and COD‐Cr in Dianchi Lake, and the causes of this relationship, are examined in this study. Results show that the increase of COD‐Cr concentration is closely related to the metabolism of algae, and that organic substances containing nitrogen and sugars, produced by metabolism, contribute to an increase of COD‐Cr to a certain extent. The characteristics of fluorescence spectra of dissolved organic matter (DOM) in the Waihai area of Dianchi Lake are similar to those of algae culture water, and their dominant substances are protein‐like substances. Algae release organic substances into water during its growth cycle and extracellular organic substances are mainly released during its normal growth and metabolism stages. Once algae cells enter the decline stage, internal organic matter is released during the dying and decomposition stages, resulting in a distinct increase of COD‐Cr. A high concentration of organic matter is present in Dianchi Lake sediments, dominated by native organic matter predominantly derived from aquatic plants and plankton. This finding indicates a potential long‐term risk of organic pollutants being released from dead algae cells into the lake. Practitioner points There is a distinct positive correlation between COD‐Cr and Chl‐a concentration in Dianchi Lake. Organic substances containing nitrogen and sugars produced by algae metabolism contributed to COD‐Cr. The cells die and decompose organic matter content in the water substantially increases, resulting in a distinct increase of COD‐Cr. Weight >20 kDa are mainly released into the water body during the decomposition of algae cells after mortality. Organic matter content in the water substantially increases, resulting in a distinct increase of COD‐Cr.

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“…Freshwater microalgae could provide a promising feedstock for biofuels production due to their fast growth rates, high biomass yields, high carbon dioxide sequestration ability, and their strong potential to grow on marginal lands that do not compete with agricultural crops (Yun et al 2014;Ramaraj et al 2010;Saraf and Dutt, 2021;Al-Lwayzy et al 2014). Every species has a distinct growth rate and innate metabolic profile.…”

Section: Freshwater Speciesmentioning

confidence: 99%

Algal biomass valorization for biofuel production and carbon sequestration: a review

et al. 2022

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The world is experiencing an energy crisis and environmental issues due to the depletion of fossil fuels and the continuous increase in carbon dioxide concentrations. Microalgal biofuels are produced using sunlight, water, and simple salt minerals. Their high growth rate, photosynthesis, and carbon dioxide sequestration capacity make them one of the most important biorefinery platforms. Furthermore, microalgae's ability to alter their metabolism in response to environmental stresses to produce relatively high levels of high-value compounds makes them a promising alternative to fossil fuels. As a result, microalgae can significantly contribute to long-term solutions to critical global issues such as the energy crisis and climate change. The environmental benefits of algal biofuel have been demonstrated by significant reductions in carbon dioxide, nitrogen oxide, and sulfur oxide emissions. Microalgae-derived biomass has the potential to generate a wide range of commercially important high-value compounds, novel materials, and feedstock for a variety of industries, including cosmetics, food, and feed. This review evaluates the potential of using microalgal biomass to produce a variety of bioenergy carriers, including biodiesel from stored lipids, alcohols from reserved carbohydrate fermentation, and hydrogen, syngas, methane, biochar and bio-oils via anaerobic digestion, pyrolysis, and gasification. Furthermore, the potential use of microalgal biomass in carbon sequestration routes as an atmospheric carbon removal approach is being evaluated. The cost of algal biofuel production is primarily determined by culturing (77%), harvesting (12%), and lipid extraction (7.9%). As a result, the choice of microalgal species and cultivation mode (autotrophic, heterotrophic, and mixotrophic) are important factors in controlling biomass and bioenergy production, as well as fuel properties. The simultaneous production of microalgal biomass in agricultural, municipal, or industrial wastewater is a low-cost option that could significantly reduce economic and environmental costs while also providing a valuable remediation service. Microalgae have also been proposed as a viable candidate for carbon dioxide capture from the atmosphere or an industrial point source. Microalgae can sequester 1.3 kg of carbon dioxide to produce 1 kg of biomass. Using potent microalgal strains in efficient design bioreactors for carbon dioxide sequestration is thus a challenge. Microalgae can theoretically use up to 9% of light energy to capture and convert 513 tons of carbon dioxide into 280 tons of dry biomass per hectare per year in open and closed cultures. Using an integrated microalgal bio-refinery to recover high-value-added products could reduce waste and create efficient biomass processing into bioenergy. To design an efficient atmospheric carbon removal system, algal biomass cultivation should be coupled with thermochemical technologies, such as pyrolysis.

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Biomass of algae growth on natural water medium

Cited by 22 publications

References 32 publications

Natural Nanocolloids Mediate the Phytotoxicity of Graphene Oxide

Natural Nanocolloids Mediate the Phytotoxicity of Graphene Oxide

A study on the relationship between metabolism of Cyanobacteria and chemical oxygen demand in Dianchi Lake, China

Algal biomass valorization for biofuel production and carbon sequestration: a review

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