The economics of cyanobacteria‐based biofuel production: challenges and opportunities

Sharma, Naveen Kumar; Stal, Lucas J.

doi:10.1002/9781118402238.ch10

Cited by 11 publications

(11 citation statements)

References 66 publications

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“…Many species of cyanobacteria are unable to takeup phosphorus and nitrogen faster than other species, but several filamentous species have evolved adaptations to store phosphorus by producing the extracellular enzyme alkaline phosphatase (Isvánovics et al 2000;Cottingham et al 2015). This mechanism, allied to efficient positioning in the water column by means of gas vesicles (Sharma et al 2013), the ability to produce resting cells (akinetes) and photochromatic adaptation to optimize light absorption (Reynolds 1998) confers competitive advantages over other phytoplankton groups.…”

Section: Discussionmentioning

confidence: 99%

Potential effects of mechanically removing macrophytes on the phytoplankton community of a subtropical reservoir

Wojciechowski

Burda²,

Scheer³

et al. 2018

Acta Bot. Bras.

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Intensive growth of aquatic macrophytes interferes with water quality and ecosystem dynamics worldwide. Although mechanically removing macrophytes is the most commonly used method for their eradication, it can also cause undesirable disturbances in aquatic reservoir communities. We performed laboratory incubations of phytoplankton sampled before and after macrophytes were mechanically removed from the Piraquara II reservoir, South Brazil. We analyzed changes in growth and composition of the main phytoplankton groups with respect to nutrient shifting. Prior to removing the macrophytes, the phytoplankton community was dominated by low cell abundances of diatoms and flagellates. In contrast, growth rates of cyanobacteria (mainly Cylindrospermopsis raciborskii, Pseudanabaena sp., and Geitlerinema sp.) and of colonial chlorophytes were favored after macrophyte removal, while the abundances of diatoms and flagellates decreased. Our results suggest that removing macrophytes causes dramatic changes in phytoplankton composition and biomass and selects for toxigenic species of cyanobacteria. These changes were probably associated with the disturbance caused by removing the macrophytes, which immediately created new environmental conditions prone to species competition. These findings indicate that the use of mechanical techniques to manage macrophytes should be carefully considered, along with monitoring of harmful species and changes of limnological parameters.

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Section: Discussionmentioning

confidence: 99%

Potential effects of mechanically removing macrophytes on the phytoplankton community of a subtropical reservoir

Wojciechowski

Burda²,

Scheer³

et al. 2018

Acta Bot. Bras.

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“…Moreover, this operation mode enables the achievement of high cell densities, which besides obtaining higher productivities also allow reducing harvesting costs since continuous harvesting (e.g., continuous centrifugation) is much more efficient than the intermittent processing of large volumes from a batch cultivation (Borowitzka, 1999;Ganuza and Izquierdo, 2007;Zhu and Jiang, 2008). The fact that product harvesting can take place during cultivation makes the continuous systems particularly suitable for processes where the production of extracellular compounds, volatile products or autoinhibiting compounds are mainly targeted (Lindberg et al, 2010;Niederholtmeyer et al, 2010;Sharma and Stal, 2014). Continuous processes might be also the only viable option in situations where it is necessary to operate with toxic (e.g., removal of toxic pollutants from wastewaters) or low solubility substrates.…”

Section: Advantagesmentioning

confidence: 99%

Continuous cultivation of photosynthetic microorganisms: Approaches, applications and future trends

Fernandes

Mota

Teixeira

et al. 2015

Biotechnology Advances

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The possibility of using photosynthetic microorganisms, such as cyanobacteria and microalgae, for converting light and carbon dioxide into valuable biochemical products has raised the need for new cost-efficient processes ensuring a constant product quality. Food, feed, biofuels, cosmetics and pharmaceutics are among the sectors that can profit from the application of photosynthetic microorganisms. Biomass growth in a photobioreactor is a complex process influenced by multiple parameters, such as photosynthetic light capture and attenuation, nutrient uptake, photobioreactor hydrodynamics and gas-liquid mass transfer. In order to optimize productivity while keeping a standard product quality, a permanent control of the main cultivation parameters is necessary, where the continuous cultivation has shown to be the best option. However it is of utmost importance to recognize the singularity of continuous cultivation of cyanobacteria and microalgae due to their dependence on light availability and intensity. In this sense, this review provides comprehensive information on recent breakthroughs and possible future trends regarding technological and process improvements in continuous cultivation systems of microalgae and cyanobacteria, that will directly affect cost-effectiveness and product quality standardization. An overview of the various applications, techniques and equipment (with special emphasis on photobioreactors) in continuous cultivation of microalgae and cyanobacteria are presented. Additionally, mathematical modeling, feasibility, economics as well as the applicability of continuous cultivation into large-scale operation, are discussed.

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“…Notably, glycolysis, pentose phosphate pathway and the TCA cycle are far less active in cyanobacteria during photoautotrophic growth compared to those in model heterotrophs (28). In nonstationary isotopic 13 C labeling experiments, the intermediates of the CBC and gluconeogenesis pathway show rapid accumulation of 13 C with no detectable label accumulation in the TCA cycle intermediates, suggesting a slow turnover of these metabolites. However, some of the recent studies demonstrate plasticity in cyanobacterial metabolism resulting in a significantly higher flux through TCA cycle in engineered cyanobacteria (36).…”

Section: Flux Analysis Of Cyanobacteriamentioning

confidence: 95%

“…A number of studies report intracellular reaction rate analysis of model strains of cyanobacteria either with constraint-based modeling such as flux balance analysis (32) or isotopic 13 C metabolic flux analysis (33)(34)(35) (Fig. 2).…”

Section: Flux Analysis Of Cyanobacteriamentioning

confidence: 99%

“…Importantly, cyanobacteria can be cultivated in bioreactors in arid or otherwise unfarmable land which minimizes the competition with food crops (12). However, these organisms, like plants or eukaryotic green algae, still require significant nitrogen and phosphorus inputs which are limited and expensive resources that must be conserved (12,13). Culturing cyanobacteria in waste or saltwater and/or using nitrogenfixing strains could present a partial solution to this problem (14).…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Cyanobacteria: Promising biocatalysts for sustainable chemical production

Knoot

Ungerer

Wangikar

et al. 2018

Journal of Biological Chemistry

189

143

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The economics of cyanobacteria‐based biofuel production: challenges and opportunities

Cited by 11 publications

References 66 publications

Potential effects of mechanically removing macrophytes on the phytoplankton community of a subtropical reservoir

Potential effects of mechanically removing macrophytes on the phytoplankton community of a subtropical reservoir

Continuous cultivation of photosynthetic microorganisms: Approaches, applications and future trends

Cyanobacteria: Promising biocatalysts for sustainable chemical production

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