The action of small bubbles in increasing light exposure and production of the marine microalga Nannochloropsis oceanica in massive culture systems

Kubelka, Bruno Galler; Roselet, Fábio; Pinto, Waldir Terra; Abreu, Paulo César

doi:10.1016/j.algal.2018.09.030

Cited by 6 publications

(5 citation statements)

References 23 publications

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“…Air flow rate has been reported as a key parameter in culture mixing and liquid-gas mass transfer (Kubelka et al, 2018). Mixing rate may also be related to the light integration of the reactor (Xu et al, 2019).…”

Section: Pls Analysismentioning

confidence: 99%

“…The latter is able to achieve higher biomass production and recover more nutrients than open reactors. However, very few of these plants are being operated at industrial scale, mainly due to the inefficiency of large-scale cultivation techniques (Kubelka et al, 2018;Nayak et al, 2018;Xu et al, 2019). It therefore seems essential to obtain experimental data from real sewage plants for the implementation of large-scale outdoor microalgae-based wastewater systems.…”

Section: Introductionmentioning

confidence: 99%

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Continuous 3-year outdoor operation of a flat-panel membrane photobioreactor to treat effluent from an anaerobic membrane bioreactor

et al. 2020

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A membrane photobioreactor (MPBR) plant was operated continuously for 3 years to evaluate the separate effects of different factors, including: biomass and hydraulic retention times (BRT, HRT), light path (Lp), nitrification rate (NOxR), nutrient loading rates (NLR, PLR) and others. The overall effect of all these parameters, which influence MPBR performance had not previously been assessed. The multivariate projection approach chosen for this study provided a good description of the collected data and facilitated their visualisation and interpretation. Forty variables used to control and assess MPBR performance were evaluated during three years of continuous outdoor operation by means of principal component analysis (PCA) and partial least squares (PLS) analysis. The PCA identified the photobioreactor light path as the factor with the largest influence on data variability. Other important factors were: nitrogen and phosphorus recovery rates (NRR, PRR), biomass productivity (BP), optical density of 680 nm (OD680), ammonium and phosphorus effluent concentration (NH 4 , P), HRT, BRT, air flow rate (F air) and nitrogen and phosphorus loading rates (NLR and PLR). The MPBR performance could be adequately estimated by a PLS model based on all the recorded variables, but this estimation 2 worsened appreciably when only the controlled variables (Lp, F air , HRT and BRT) were used as predictors, which underlines the importance of the non-controlled variables on MPBR performance. The microalgae cultivation process could thus only be partially controlled by the design and operating variables. A high nitrification rate was found to be inadvisable, since it showed an inverse correlation with NRR. In this respect, temperature and microalgae biomass concentration appeared to be the main factors to mitigate nitrifying bacteria activity.

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Section: Pls Analysismentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Continuous 3-year outdoor operation of a flat-panel membrane photobioreactor to treat effluent from an anaerobic membrane bioreactor

et al. 2020

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“…Several studies have demonstrated the abundance of primary metabolites produced by microalgae; these metabolites include lipids, fatty acids, amino acids, and some sugars. However, there are few studies that investigate the complex characterization of marine microalgae, especially through more robust tools, and that enable fast, easy, non-destructive, and unbiased screening such as 1 H NMR-based metabolomics [ 32 , 33 , 34 , 35 ]…”

Section: Introductionmentioning

confidence: 99%

Application of 1H HR-MAS NMR-Based Metabolite Fingerprinting of Marine Microalgae

et al. 2023

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Natural products from the marine environment as well as microalgae, have been known for the complexity of the metabolites they produce due to their adaptability to different environmental conditions, which has been an inexhaustible source of several bioactive properties, such as antioxidant, anti-tumor, and antimicrobial. This study aims to characterize the main metabolites of three species of microalgae (Nannochloropsis oceanica, Chaetoceros muelleri, and Conticribra weissflogii), which have important applications in the biofuel and nutrition industries, by 1H High-resolution magic angle spinning nuclear magnetic resonance (1H HR-MAS NMR), a method which is non-destructive, is highly reproducible, and requires minimal sample preparation. Even though the three species were found in the same ecosystem and a superior production of lipid compounds was observed, important differences were identified in relation to the production of specialized metabolites. These distinct properties favor the use of these compounds as leaders in the development of new bioactive compounds, especially against environmental, human, and animal pathogens (One Health), and demonstrate their potential in the development of alternatives for aquaculture.

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“…Las algas que se encuentran en la superficie están expuestas a una alta intensidad lumínica y pueden verse afectadas por la fotoinhibición (Pires et al, 2017), mientras que las algas del fondo permanecerán en una zona oscura donde apenas llega la luz (Raeisossadati et al, 2019). Por lo que es importante que estos reactores se encuentren bien mezclados, de esta manera las algas podrán encontrarse igualmente repartidas entre las zonas más desfavorables para la fotosíntesis y la zona lumínica óptima (Kubelka et al, 2018). Para evitar la atenuación lumínica debido a las condiciones ambientales se puede optar por emplear luz artificial, la cual permite controlar tanto su intensidad como su duración, aunque esta alternativa implica un mayor consumo energético (Abu-Ghosh et al, 2016).…”

Section: Microalgasunclassified

Estudio de la eliminación/recuperación de nitrógeno en el permeado de la ultrafiltración de la línea de aguas de una EDAR mediante eliminación por nitrificación parcial y recuperación con zeolitas

Godifredo Calvo

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The action of small bubbles in increasing light exposure and production of the marine microalga Nannochloropsis oceanica in massive culture systems

Cited by 6 publications

References 23 publications

Continuous 3-year outdoor operation of a flat-panel membrane photobioreactor to treat effluent from an anaerobic membrane bioreactor

Continuous 3-year outdoor operation of a flat-panel membrane photobioreactor to treat effluent from an anaerobic membrane bioreactor

Application of 1H HR-MAS NMR-Based Metabolite Fingerprinting of Marine Microalgae

Estudio de la eliminación/recuperación de nitrógeno en el permeado de la ultrafiltración de la línea de aguas de una EDAR mediante eliminación por nitrificación parcial y recuperación con zeolitas

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