Minimising microbubble size through oscillation frequency control

Brittle, Stuart A.; Desai, Pratik; Ng, Woon Choon; Dunbar, Alan D. F.; Howell, Robert J.; Tesař, Václav; Zimmerman, William B.

doi:10.1016/j.cherd.2015.08.002

Cited by 27 publications

(11 citation statements)

References 18 publications

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“…That the frequency of oscillatory air supply has significant impact on mineral flotation is consistent with the observation made by Brittle, et al [30]. They measured the size and number density of bubbles generated using a porous sparger and a fluidic oscillator and found that there was a critical frequency at which the bubble size was the smallest.…”

Section: Effects Of Operating Variables On R F R C and R Osupporting

confidence: 86%

Improved froth zone and collection zone recoveries of fine mineral particles in a flotation column with oscillatory air supply

Wang

2018

Separation and Purification Technology

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Froth flotation has been widely used for the separation and concentration of minerals and other particulate materials by exploiting the difference in their affinity to air bubbles in aquoues medium. One of the key challenges in flotation separation is to improve the recovery of valuable fine particles. This paper reports the column flotation of fine silica particles with oscillatory air supply generated using a fast-switching solenoid valve. The flotation tests were carried out at continuous mode using a specially designed 50 mm diameter column with the recoveries of silica in the froth zone and the collection zone being measured directly. A comparative study with oscillatory air supply and conventional steady air supply was conducted by varying valve switching frequency, valve on/off time ratio, superficial gas velocity, air pressure, and reagent dosage. It was found that use of oscillatory air supply with a proper frequency and valve on/off time ratio to replace steady air supply would increase not only the collection zone recovery but also the froth zone recovery. A strong correlation between the measured froth zone recovery and collection zone recovery was observed.

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Section: Effects Of Operating Variables On R F R C and R Osupporting

confidence: 86%

Improved froth zone and collection zone recoveries of fine mineral particles in a flotation column with oscillatory air supply

Wang

2018

Separation and Purification Technology

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“…(2016) [1][2][3][4][5][6][7][8][9] www.deswater.com doi: 10.1080/19443994.2016.1152645 of scum on the surface of water. This is widely accepted for the treatment of municipal and industrial wastewaters [2,5,6].…”

Section: Desalination and Water Treatmentmentioning

confidence: 98%

“…Microbubbles are defined as bubbles with diameters on the order of 10-50 μm and have unique properties due to their small size [8,9]. For instance, microbubbles have high-specific surface area (the ratio of surface area to the volume), allowing the high efficiency of pollutant adhesion [7,10]. Due to its high effectiveness of pollutant removal, microbubble floatation has drawn attention for not only wastewater treatment [11][12][13] but also water purification [14,15] and pretreatment for seawater desalination [16][17][18].…”

Section: Desalination and Water Treatmentmentioning

confidence: 99%

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Influence of microbial floatation on membrane fouling due to particles and organic matters in submerged microfiltration

Pissibanganga

Jung

Choi

et al. 2016

Desalination and Water Treatment

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A B S T R A C TThis study investigated the effect of microbubble floatation on the fouling of microfiltration membranes. Synthetic feed solutions containing either kaolin or alginic acid were used for the membrane filtration tests. A dissolve air flotation system using a pump-type microbubble generator was adopted as a pretreatment for microfiltration system. A multi-array submerged membrane filtration system was used to monitor the changes in transmembrane pressure with time under various operating conditions. Turbidity removal efficiency, particle counts, and fouling rate for the microfiltration membrane were measured after the microfiltration floatation. The effect of coagulant dose on the treated water quality and membrane performance was also investigated. Results showed that microbubble floatation without coagulant was effective to reduce membrane fouling by kaolin but it was not very effective to control fouling by alginate. With the aid of coagulant, microbubble flotation could control fouling by alginate. This is attributed to the removal mechanisms of foulants by microbubble floatation: suspended particles can be separated by the microbubbles without coagulant but dissolved organics can be only removed by the combined effect of coagulation and floatation.

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“…When applying acoustic oscillations with a certain frequency on the gas dispersion flow, intensive mechanical vibrations of highly dispersed suspended liquid droplets in the gas dispersion flow occur, resulting in a sharp increase in the number of their collisions. But the opposite effect of overlaying acoustic vibrations, in particular, the increase of the dispersion of the liquid phase, can be observed [11]. Therefore, it is necessary to know the specific frequency of oscillations in which there is a coagulation of suspended particles in the liquid.…”

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confidence: 99%

Static calculation of the dynamic deflection elements for separation devices

Павленко¹,

Павленко²,

Pavlenko³

et al. 2017

JES

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The following paper considers the influence of acoustic oscillations on multiphase flows on their suspended particles, which can be destroyed or coagulated by vibrations. Considering this, the method of extension of application range of the dynamic separation element as vibrocoagulants due to the use of hydroaeroelasticity phenomena, namely flutter, has been proposed. There were considered the problems of development an engineering method for calculating dynamic separation elements, the main of which is the analytical solution of the hydroaeroelasticity problem. This work takes the first step to its development, considering the previous elastic elements deformation that has a significant effect on the flutter frequency. The state of their static equilibrium was conducted with the use of analytical dependencies of the finite element method. The bimodal finite elements with six degrees of freedom were used for dynamic deflection elements. As the result, there was determined the stiffness of pre-deformed plates and their maximum and minimum possible deflections. The functions of the median surface deflection in the form of a cubic polynomial were used in the model.In particular, there were considered the peculiarities of numerical modelling of coupled problems of gashydrodynamics flows and structural dynamics using the ANSYS Workbench, namely Fluent Flow and Transient Structural modules, which are combined with System Coupling. Also, the peculiarities of different approaches to multi-phase flow modelling are indicated. They are interesting not only by distribution of particles in the stream core, but also by the entrapped liquid film motion on the deposition surfaces.

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Minimising microbubble size through oscillation frequency control

Cited by 27 publications

References 18 publications

Improved froth zone and collection zone recoveries of fine mineral particles in a flotation column with oscillatory air supply

Improved froth zone and collection zone recoveries of fine mineral particles in a flotation column with oscillatory air supply

Influence of microbial floatation on membrane fouling due to particles and organic matters in submerged microfiltration

Static calculation of the dynamic deflection elements for separation devices

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