A study on bubble formation and its relation with the performance of apatite flotation

Reis, Ana Carla Bittencourt; Barrozo, M. A. S.

doi:10.1016/j.seppur.2016.01.038

Cited by 54 publications

(16 citation statements)

References 32 publications

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“…Being as an aeration device, it can increase the concentration of dissolved oxygen in the water to promote the growth of fish and plants, and has been successfully applied to fish farming (Akhtar et al, 2018) and agriculture production (Bagatur, 2014;Dahrazma et al, 2019). With the ability of supplying a large number of fine bubbles, Venturi bubble generator has a good prospect in waste water treatment (Mitra et al, 2016;Kaya et al, 2017), mineral flotation (Ahmadi et al, 2014;Reis and Barrozo, 2016), ship drag reduction (Kawamura et al, 2004;Hashim et al, 2015), and bioreactors (Krusong et al, 2015;Kayaalp and Ozturkmen, 2016).…”

Section: Bubble Generation Methodsmentioning

confidence: 99%

A review on bubble generation and transportation in Venturi-type bubble generators

Huang

Sun

Liu

et al. 2019

Exp. Comput. Multiph. Flow

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Venturi-type bubble generators own advantages of simplicity in structure, high efficiency, low power consumption, and high reliability, exhibiting a broad application potential in various fields. This work presents a literature review of recent progress in the research concerning Venturi-type bubble generators, with a focus on the performance evaluation, bubble transportation, and breakup mechanisms. Experimental studies employing flow visualization techniques have played an important role in exploring the bubble transportation and breakup phenomena, which is vitally necessary for clarifying the bubble breakup mechanisms and understanding the working principle and performance of a Venturi channel as a bubble generator. A summarization was carried out on both experimental and theoretical work concerning parameters influencing the bubble breakup and the performance of Venturi-type bubble generators. Based on the geometric parameter optimization combined with appropriate flow conditions, it is expected that Venturi-type bubble generators can produce bubbles with controllable size and concentration to satisfy the application requirements, while a further work is required to illustrate the interaction between the liquid and gas bubbles.

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Section: Bubble Generation Methodsmentioning

confidence: 99%

A review on bubble generation and transportation in Venturi-type bubble generators

Huang

Sun

Liu

et al. 2019

Exp. Comput. Multiph. Flow

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“…The contact efficiency of solid particles with air bubbles is related to different physicochemical properties of minerals. It is important to modulate the way that hydrophobic mineral particles contact and adhere to air bubbles . Bubble size also plays an important role in flotation.…”

Section: Introductionmentioning

confidence: 99%

Effects of bubble size, velocity, and particle agglomeration on the electro‐flotation kinetics of fine cassiterite

Ren

Zeng

Nguyen

et al. 2019

Asia-Pacific J Chem Eng

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Hydrodynamic behavior of fine particles and bubbles and their influences on the particle-bubble collision efficiency (E c ) in an electro-flotation system were analyzed in this study. The influence of sodium oleate on the agglomeration of cassiterite particles and the effect of electrolyte (Na 2 SO 4 ) concentration on the zeta potential of cassiterite were investigated in detail, respectively. Bubble trajectory was recorded by using a high-speed camera to investigate the dynamic process in terms of bubble velocity. Moreover, bubble size was taken into account in the determination of the relationship between bubble velocity and E c . The Reynolds number (Re b ) was calculated to be 4.77 for hydrogen (H 2 ) bubbles with a mean diameter of 52 μm. The highest recovery of cassiterite particles (<10 μm) was obtained by using 20 μm bubbles during flotation. The results indicate that the Yoon-Luttrell intermediate fluid (between the Stokes and potential flows) condition is applicable for the cassiterite electro-flotation system, and E c is improved by controlling the size and velocity of the hydrogen bubble, and the agglomeration of fine cassiterite particles in electro-flotation.Additionally, it was greatly inspired to explore bubble-particle attachment in dissolved air flotation from these results.

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“…The addition of surfactants reduces bubble coalescence and push bubbles in the slurry zone towards the foam phase, due to an increase in air bubble residence time [24]. Ozone also reduces the surface charge of cells (measured in terms of zeta potential) and increases the extraction of lipids and carbohydrates due to its 3 oxidizing action.…”

Section: Introductionmentioning

confidence: 99%

The effect of bubble size distribution on the release of microalgae proteins by ozone-flotation

Oliveira

Monje–Ramírez

Carissimi

et al. 2019

Separation and Purification Technology

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Interest in sustainable energy production is one of the most important resources in the development of technologies, and one of the promising sources is the use of microalgae as a raw material. These are obtained in nature, do not need good conditions to develop, occupy a small area for growth and replace the use of food products for the production of biofuel. However, one of the biggest hurdle is the biomass harvest and one of the innovative techniques being proposed is ozone-flotation. Flotation processes are influenced by the physical characteristics of bubbles and particles, and therefore it is necessary to investigate the size distribution of generated bubbles, their action in microalgal cells and the oxidation and release of proteins that act as biosurfactants. In this work the effect of ozone bubble size in a three-phase system (ozonewastewatermicroalgae) and size of microalgal particles separated by ozone-flotation were evaluated. Three ozone flows were used (0.2, 0.6 and 1 L/min). Best results were obtained with a flow of 0.6 L/min achieving 88.5% efficiency, increased biomass oxidation, destabilization of microalgal cells (zeta potential 3.17 mV), highest protein release (46.7 mg/L) and, a demonstrated efficiency of proteins in reducing bubble coalescence.Regarding the latter, no differences in size or distribution of the ozone bubbles were obtained between the 3 evaluated heights of the column (bottom, middle and top). At this flow the mean bubble diameters were maintained at 1910, 2028 and 2071 μm for bottom, middle and top, respectively, with approximately 50% of the bubbles concentrated up to 2000 μm. In addition, due to the higher action of ozone with microalgal cells, smaller particle sizes in the column were found due to the oxidizing action of ozone.

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A study on bubble formation and its relation with the performance of apatite flotation

Cited by 54 publications

References 32 publications

A review on bubble generation and transportation in Venturi-type bubble generators

A review on bubble generation and transportation in Venturi-type bubble generators

Effects of bubble size, velocity, and particle agglomeration on the electro‐flotation kinetics of fine cassiterite

The effect of bubble size distribution on the release of microalgae proteins by ozone-flotation

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