Hydrodynamic performance of two air nozzles diameters on the massive microalgae culture: Computational and experimental approaches

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

doi:10.1016/j.algal.2017.09.024

Cited by 8 publications

(7 citation statements)

References 12 publications

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“…C. muelleri samples were cultivated using the batch technique on Guillard's medium supplemented with silicate for diatoms (f/2+Si) [43] in a 330 L bubble column photobioreactor (0.25 m radius, 1.5 m height), and they were then maintained indoors under controlled conditions (23 °C, 150 μmol m −2 s −1 , and 16 h L: 8 h D light period). The culture was kept in suspension by continuous atmospheric air injection (4.8 L min −1 ) using air nozzles [44] . Cell abundance was monitored daily using an improved Neubauer hemocytometer at 400× magnification.…”

Section: Methodsmentioning

confidence: 99%

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Chemical Profile and Antimicrobial Activity of the Marine Diatom Chaetoceros muelleri

Ramos

Halicki

Caprara

et al. 2022

Chemistry & Biodiversity

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Microalgae, due to its rapid growth, low nutritional requirements, and versatility of adaptation to different environmental conditions, has aroused the biotechnological interest, synthesizing novel molecules with antioxidant, anticoagulant, anti‐inflammatory, antitumor, and antimicrobial activities. In this sense, we carried out the bioprospection of Chaetoceros muelleri, a marine diatom employed in aquaculture, as a candidate to the development of new drugs for the treatment of bacterial infections. The chemical profile of extracts in different solvents (hexane, chloroform, methylene chloride, ethyl acetate, methanol, and acetone) were analyzed by 1H‐NMR. The hexane extract was the most active against all bacteria species tested, including Mycobacterium tuberculosis, with a minimum inhibitory concentration of 100 μg/ml. Contrarily, the methanol extract was inactive against all tested microorganisms and, in addition, was the only one with IC50 >800 μg/mL, showing no cytotoxicity in VERO cell lines. All other extracts showed antibacterial potential and IC50 values varying between 267.58 and 142.47 μg/ml. The fact that C. muelleri is a microalga easily grown on bioreactors on a large scale may promote its biotechnological use, especially as scaffolds for the development of new compounds against bacterial species of clinical and public health interest.

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Section: Methodsmentioning

confidence: 99%

“…The culture was kept in suspension by continuous atmospheric air injection (4.8 L min À 1 ) using air nozzles. [44] Cell abundance was monitored daily using an improved Neubauer hemocytometer at 400 × magnification. Cultivation was maintained until the stationary phase was reached (12 days).…”

Section: Microalgae Cultivationmentioning

confidence: 99%

Chemical Profile and Antimicrobial Activity of the Marine Diatom Chaetoceros muelleri

Ramos

Halicki

Caprara

et al. 2022

Chemistry & Biodiversity

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“…Microalgae present several key advantages over higher plants as renewable source of sustainable biofuel (Khan, Shin, & Kim, 2018). Nevertheless, inevitably there is a demand for successful advances in cultivation tank design, so it can also be scaled up with more reduced cost and that has attracted the interest of several groups (Posten, 2009;Salama et al, 2017;Kubelka et al 2017). Of the entire microalgae biomass production chain, about 27% of the total cost are due to the energy consumption by the culture tank mixing/circulation system (Pires, Alvim-Ferraz, & Martins, 2017).…”

Section: Introductionmentioning

confidence: 99%

“…Decreasing air ow rate in the cultivation tank results in a marked reduction in the surface velocity of air getting into the culture tank (Kulkarni & Joshi, 2005). This may result in higher settling of microalgae cells forming dead-zones (Rampure, Kulkarni, & Ranade, 2007), and leading to a decrease in biomass productivity (Kubelka, Pinto, & Abreu, 2017). On the other hand, low air ow rate leads to a reduction in the energy cost to produce microalgae biomass (Norsker, Barbosa, Vermuë, & Wijffels, 2012).…”

Section: Introductionmentioning

confidence: 99%

“…In this context, the Microalgae Production Laboratory (LPM) at the Federal University of Rio Grande, works in the development of a low-cost biomass production system. To achieve this, the laboratory began seeking methods to improve cultivation conditions without increasing energy requirements (Kubelka et al, 2017; Kubelka, Roselet, Pinto, & Abreu, 2018), or indeed reducing production costs (Faé Neto, Borges Mendes, & Abreu, 2018). Harvesting procedures also were developed by LPM so biomass production costs were also reduced (Roselet, Burkert, & Abreu, 2016).…”

Section: Introductionmentioning

confidence: 99%

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Balancing energy efficiency and biomass yield through Computational Fluid Dynamics of a commercial scale bubble-column photobioreactor

Kubelka,

Abreu,

Pinto

2024

Preprint

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Microalgae biomass derived fuel need to maximize production with minimal energy input to cultivation and harvesting operations. The mixing/circulation comprises an essential step in the expensive microalgae cultivation process. Additionally, prevents cell settlement and increases exposure to light and nutrients. Nevertheless, it is responsible for at least one-third of total cost to produce lipid from microalgae. Regulating air input is an effective way to save energy, but it can compromise production. Computational Fluid Dynamics was used to determine the percentage of dead-zones in 330 L photobioreactors (aspect ratio of 4.54) for production of the microalgae Nannochloropsis oceanica with different airflow. Three numerical cases were selected for growth experiments. The airflow rate of 0.0024 vvm allowed satisfactory production and low energy input. It is noteworthy that experiments with the highest Energy Return On Investment values were also observed in this airflow rate (0.0024 vvm). The complementary application of the tools (Energy Return On Investment and Computational Fluid Dynamics) have shown high potential to reach the economic viability of microalgae biofuel.

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Foam fractionator as a tool to remove dissolved organic matter and improve the flocculation of the marine microalga Nannochloropsis oceanica

Roselet

Abreu

2019

J Appl Phycol

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Hydrodynamic performance of two air nozzles diameters on the massive microalgae culture: Computational and experimental approaches

Cited by 8 publications

References 12 publications

Chemical Profile and Antimicrobial Activity of the Marine Diatom Chaetoceros muelleri

Chemical Profile and Antimicrobial Activity of the Marine Diatom Chaetoceros muelleri

Balancing energy efficiency and biomass yield through Computational Fluid Dynamics of a commercial scale bubble-column photobioreactor

Foam fractionator as a tool to remove dissolved organic matter and improve the flocculation of the marine microalga Nannochloropsis oceanica

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