<i>Synechococcus</i> sp. (PTCC 6021) cultivation under different light irradiances—Modeling of growth rate-light response

Zenooz, Alireza Moosavi; Ashtiani, Farzin Zokaee; Ranjbar, Reza; Javadi, Najvan

doi:10.1080/10826068.2015.1084931

Cited by 6 publications

(11 citation statements)

References 33 publications

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“…At this stage of research, the growth characteristics of locally isolated Synechococcus strain are comparable to other marine and freshwater strains [28], including other Synechococcus strains locally isolated in the Gulf region [48]. Accumulation of lipids as 26% of the dry weight biomass can also be considered high for a wild strain [49].…”

Section: Discussionmentioning

confidence: 99%

Evaluation of Marine Synechococcus for an Algal Biorefinery in Arid Regions

et al. 2019

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Implementing microalgae biorefinery in arid environments requires utilization of strains that can grow at high temperatures (above 28 °C) and salinity levels (above 30 ppt). In this study, we investigate the newly isolated seawater strain, Synechococcus, native to the United Arab Emirates, and evaluate its value as a perspective organism for cultivation (for fuel and bio-products) in regions with freshwater scarcity. The strain displayed tolerance to a wide range of temperature (22–37 °C) and salinity (20–41 ppt), with maximum biomass concentration of 0.72 g L−1 and a maximum growth rate of 82 mg L−1 d−1 at 25 °C and 33 ppt salinity. Lipids accumulation reached up to 26% of dry weight in nitrogen-depleted conditions (with 1.8 mM of nitrates addition to the media), whereas protein content exceeded 50% dry weight. In this study, harvesting is investigated using three chemical agents: Ferric chloride, sodium hydroxide, and chitosan. Cell disruption is analyzed for four distinct treatments: Enzymatic, alkaline, ultrasonic, and hydrothermal. Among tested methods, flocculation with sodium hydroxide and ultrasonication were found to be the most efficient techniques for harvesting and cell disruption, respectively. The growth characteristics of the local strain and the potential to derive protein and lipids from it makes it a promising biomass in a biorefinery context.

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Section: Discussionmentioning

confidence: 99%

Evaluation of Marine Synechococcus for an Algal Biorefinery in Arid Regions

et al. 2019

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“…Growth of cultures was accomplished under room temperature of 30

° normalC

and light intensity of 20–40 μmol/(m 2 *s) at the surface of the reactor. Details of culturing method and the photobioreactor system have been well described elsewhere …”

Section: Methodsmentioning

confidence: 99%

“…Details of culturing method and the photobioreactor system have been well described elsewhere. 27 Flocculation Technique. Jar test protocol was applied to perform the flocculation experiment.…”

Section: Methodsmentioning

confidence: 99%

Modeling of microalgal shear‐induced flocculation and sedimentation using a coupled CFD‐population balance approach

Golzarijalal

Ashtiani

Dabir

2017

Biotechnology Progress

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In this study, shear-induced flocculation modeling of Chlorella sp. microalgae was conducted by combination of population balance modeling and CFD. The inhomogeneous Multiple Size Group (MUSIG) and the Euler-Euler two fluid models were coupled via Ansys-CFX-15 software package to achieve both fluid and particle dynamics during the flocculation. For the first time, a detailed model was proposed to calculate the collision frequency and breakage rate during the microalgae flocculation by means of the response surface methodology as a tool for optimization. The particle size distribution resulted from the model was in good agreement with that of the jar test experiment. Furthermore, the subsequent sedimentation step was also examined by removing the shear rate in both simulations and experiments. Consequently, variation in the shear rate and its effects on the flocculation behavior, sedimentation rate and recovery efficiency were evaluated. Results indicate that flocculation of Chlorella sp. microalgae under shear rates of 37, 182, and 387 s is a promising method of pre-concentration which guarantees the cost efficiency of the subsequent harvesting process by recovering more than 90% of the biomass. © 2017 American Institute of Chemical Engineers Biotechnol. Prog., 34:160-174, 2018.

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“…These organisms can mitigate carbon dioxide from the atmosphere to their biomass for lipid accumulation 24,25 . In addition, microalgae grow fast compared to crops, does not need agricultural land or fresh water, and could provide high amounts of biomass 26,27 . Moreover, microalgae produce a wide range of bioproducts, including polysaccharides, lipids, pigments, proteins, vitamins, bioactive compounds, and antioxidants, which can lead to different beneficial products, including human food, animal fodder, and food supplements 28–32 …”

Section: Introductionmentioning

confidence: 99%

“…It costs 20–30% of total microalgae production and processing costs 28,33–36 . Traditional separation methods like centrifugation and filtration are not feasible for microalgae harvesting because of dilute growth medium and small size of cells 27,37–40 …”

Section: Introductionmentioning

confidence: 99%

Flocculation of Chlorella vulgaris with alum and pH adjustment

Mohseni

Zenooz

2021

Biotech and App Biochem

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Microalgae, a group of photosynthetic microorganisms, are a promising feedstock for biodiesel production, but their biomass retrieval is a challenging task.Flocculation is a feasible method for dewatering and harvesting microalgae biomass. In the current study, the effect of alum flocculation on Chlorella vulgaris biomass retrieval has been studied. Alum structural changes with pH were led to a full factorial design to address the effect of this chemical structure changes at different pH values. It is observed that the best flocculation efficiency could be achieved in the natural pH value of C. vulgaris growth medium (8.2) with less than 0.5 g/L flocculant addition, which would lead to the flocculation efficiency of more than 90%. An ensemble architecture of neural networks successfully employed for flocculation modeling.

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Synechococcus sp. (PTCC 6021) cultivation under different light irradiances—Modeling of growth rate-light response

Cited by 6 publications

References 33 publications

Evaluation of Marine Synechococcus for an Algal Biorefinery in Arid Regions

Evaluation of Marine Synechococcus for an Algal Biorefinery in Arid Regions

Modeling of microalgal shear‐induced flocculation and sedimentation using a coupled CFD‐population balance approach

Flocculation of Chlorella vulgaris with alum and pH adjustment

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