Optimization of microalgae growth for biofuel production using a new empirical dynamic model

Humphrey, Ibifubara; Chendo, M.A.C.; Njah, A. N.; Nwankwo, D. I.

doi:10.1080/17597269.2019.1608012

Cited by 5 publications

(2 citation statements)

References 27 publications

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“…Microalgal growth rates were monitored by measuring the optical density (OD at 680 nm) and specific growth rate (μ) calculated as: μ = ln (N 2 /N 1 )/(t 2 −t 1 ), where N 2 and N 1 refer to optical density at times t 2 and t 1 during the exponential growth phase (Levasseur et al, 1993;Humphrey et al, 2021).…”

Section: Microalgal Growth Characteristicsmentioning

confidence: 99%

Enhancement of carbamazepine removal rate using Tetradesmus obliquus KNUA061 and NaOCl and utilization of the resulting biomass

Yeo

et al. 2022

Front. Energy Res.

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Pharmaceutical and personal care products (PPCPs) are discharged into receiving water bodies mainly from sewage treatment plants. Due to the inefficient removal in conventional wastewater treatment facilities, PPCPs have become a major concern to aquatic ecosystems, water quality, and public health worldwide since they cause harmful effects on aquatic life and human even at low doses. Among the PPCPs, carbamazepine (CBZ) is one of the most commonly prescribed anticonvulsant drugs and consumed more than 1,000 tons per year. Due to its structural complexity, CBZ is known as recalcitrant compound highly stable during wastewater treatment. Consequently, it has become one of the most frequently detected pharmaceuticals in waste water, surface water, and even drinking water. In this study, Korean indigenous microalgae strains were tested as eco-friendly and cost-effective solutions for CBZ removal. Based on the preliminary biological CBZ degradation tests, Tetradesmus obliquus KNUA061 demonstrating the best CBZ removal rate was selected for further experiments. In order to increase strain KNUA061's CBZ removal efficiency, NaOCl, which is widely accepted in the water purification process, was used as an additional stimulus to induce stress conditions. At around 20 μg L−1 CBZ, addition of 1.0 mg NaOCl resulted in approximately 20% of removal rate increase without suppressing cells growth. Roughly 90% of CBZ remained its original form and the composition of the transformed secondary metabolites was less than 10% during the biodegradation process by the microalga. Based on the results of the antioxidant enzyme activities, degree of lipid oxidation, and amino acid contents, it was concluded that the redox-defence system in microalgal cells may have been activated by the NaOCl treatment. Biomass analysis results showed that higher heating value (HHV) of strain KNUA061 biomass was higher than those of lignocellulosic energy crops suggesting that it could be utilized as a possible renewable energy source. Even though its biodiesel properties were slightly below the international standards due to the high PUFA contents, the biodiesel produced from T. obliquus KNUA061 could be used as a blending resource for transportation fuels. It was also determined that the microalgal biomass has acceptable feasibility as a sustainable dietary supplement feedstock due to its high essential amino acid contents.

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Section: Microalgal Growth Characteristicsmentioning

confidence: 99%

Enhancement of carbamazepine removal rate using Tetradesmus obliquus KNUA061 and NaOCl and utilization of the resulting biomass

Yeo

et al. 2022

Front. Energy Res.

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“…All experiments were done in triplicates or stated otherwise. Percent growth rate 17 Here, VPresent is cell count at the end time, VPast is the starting count and Time is the total number of days.…”

Section: Introductionmentioning

confidence: 99%

Macromolecular characterization and growth kinetics of Arthrospira platensis and Chlorella Vulgaris as affected by different media (synthetic and Anaerobic Digestor Effluent) - A comparative study.

Abid¹,

Khan²,

Zeb³

et al. 2020

Int. j. endorsing health sci. res.

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Background: Global concern about the availability of irrefragable, nutritious food to the masses to eliminate malnutrition had raised interest in microalgae-based dietary supplements. Furthermore, improper disposal of industrial wastewater is contaminating freshwater resources around the world, which is increasing the demand for eco-friendly water recycling strategies. The focus has been shifted to the use of microalgae because of their ability to treat wastewater and their biotechnological applications. Among them, Chlorella Vulgaris and Arthrospira platensis are attracting considerable attention for their effective growth on wastewater and their nutritional value and use in biofuel production. Methodology: Cultures of C. Vulgaris and A. platensis were subjected to different growth conditions to analyze their growth kinetics and biomass production in their respective synthetic media and Anaerobic Digestor Effluent (ADE). The biomass produced was further analyzed for its protein (Lowry method), carbohydrate (phenol-sulfuric method), and lipid (Bligh and Dyer method) content. Results: The results obtained through the growth kinetics study showed that C. Vulgaris and A. platensis display a better growth rate on ADE at higher light intensities as compared to cultures growing on synthetic media. Significantly different levels of protein, carbohydrate, and lipid were also reported. C. Vulgaris grown on ADE had 78.5% protein content compared to 62% achieved in F/2 medium. Similarly, 7.6% of carbohydrate content was achieved in ADE compared to 6% in F/2. Lipid content however was much higher in F/2 (22%) compared to ADE (13%). The culture of A. platensis grown on ADE had 84% protein content compared to 71% achieved in Zarrouk’s medium. Similarly, 11.7% of carbohydrate content was achieved in ADE compared to 16.6% in Zarrouk’s. Lipid content in A. platensis was found to be very low (3%). Conclusion: The present study builds an understanding of the relationship between different factors contributing to economical microalgae production and macromolecular characterization of the targeted microalgae for analyzing its potential applications and uses. The study further suggests the added advantage of cost-effective production of algal biomass with an added advantage of phycoremediation using ADE as growth media.

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Carbon dioxide sequestration and wastewater treatment via an innovative self-sustaining algal microbial fuel cell

Kumar

Jujjavarapu

2023

Journal of Cleaner Production

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Optimization of microalgae growth for biofuel production using a new empirical dynamic model

Cited by 5 publications

References 27 publications

Enhancement of carbamazepine removal rate using Tetradesmus obliquus KNUA061 and NaOCl and utilization of the resulting biomass

Enhancement of carbamazepine removal rate using Tetradesmus obliquus KNUA061 and NaOCl and utilization of the resulting biomass

Macromolecular characterization and growth kinetics of Arthrospira platensis and Chlorella Vulgaris as affected by different media (synthetic and Anaerobic Digestor Effluent) - A comparative study.

Carbon dioxide sequestration and wastewater treatment via an innovative self-sustaining algal microbial fuel cell

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