Surface-modified microbubbles (colloidal gas aphrons) for nanoparticle removal in a continuous bubble generation-flotation separation system

Zhang, Ming; Guiraud, Pascal

doi:10.1016/j.watres.2017.09.051

Cited by 47 publications

(4 citation statements)

References 39 publications

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“…As a kind of ne bubbles, micro-nanobubbles (MNB) has sm all diameter (with a diameter of 200 nm-50 µm), large speci c surface area and low rising velocity in liquid, and it persists for long periods and signi cantly improves gas solubility (Feng et al, 2020;Hu and Xia, 2018). With the superior mass transfer characteristics, MNB has received continuous attention in the elds of aeration (Ye et al, 2019;Zhang and Guiraud, 2017). Some studies about contaminant removal e ciency under MNB aeration have shown satisfactory performance.…”

Section: Introductionmentioning

confidence: 99%

A comparative study of removal efficiency of organic contaminant in landfill leachate-contaminated groundwater under micro-nano-bubble and common bubble aeration

Bai

Liu

Zhan

et al. 2022

Environ Sci Pollut Res

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Land ll leachate contaminated groundwater is widespread all over the world. In order to study the organic contaminant removal e ciency of land ll leachate contaminated groundwater under oxygen micro-nanobubble (MNB) aeration, a series of lab-scale experiments of oxygen MNB aeration as well as common bubble (CB) aeration were conducted. On the one hand, the difference of mass transfer, microbial activity enhancement and contaminant removal e ciency between MNB and CB aeration were estimated. On the other hand, the composition variations of dissolved organic matter (DOM) in groundwater treated by MNB or CB aeration were characterized by ultraviolet-visible (UV-VIS) absorption spectrum and uorescence excitation-emission matrix (EEM). The test results showed that the oxygen utilization e ciency and volumetric oxygen transfer coe cient of MNB aeration were 10 and 50 times that of oxygen CB aeration, respectively. On the 30th day after MNB aeration, the dehydrogenase activity (DHA) of groundwater increased by 101.25%. Compared with CB aeration, the chemical oxygen demand (COD), 5-day biochemical oxygen demand (BOD 5 ) and ammonia nitrogen removal e ciency under MNB aeration increased by 29.72%, 13.43% and 138.59%, respectively. With the biodegradation effect of MNB aeration, a large number of protein-like and soluble microbial by-product substances were degraded, and humic and fulvic acid-like substances were degraded to a certain level. Oxygen MNB aeration played a chemical oxidation effect while enhancing the biodegradation of groundwater, and it was an energy-e cient land ll leachate contaminated groundwater treatment method.

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Section: Introductionmentioning

confidence: 99%

A comparative study of removal efficiency of organic contaminant in landfill leachate-contaminated groundwater under micro-nano-bubble and common bubble aeration

Bai

Liu

Zhan

et al. 2022

Environ Sci Pollut Res

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“…Micronanobubbles (MNBs) are tiny bubbles with diameters of 200 nm–50 μm. They have small diameters, large specific surface areas, and low rising velocities in the liquid phase, so they can persist for long periods and significantly improve gas solubility. , Due to their superior mass transfer characteristics, MNBs have received attention in the fields of bioprocesses and groundwater remediation. , However, most of the studies on MNBs focused on their generation, characterization, and physical properties in aqueous solutions and the effects of application . Reports about the mass transfer of MNBs are still limited.…”

Section: Introductionmentioning

confidence: 99%

“…1,2 Due to their superior mass transfer characteristics, MNBs have received attention in the fields of bioprocesses and groundwater remediation. 3,4 However, most of the studies on MNBs focused on their generation, characterization, and physical properties in aqueous solutions and the effects of application. 5 Reports about the mass transfer of MNBs are still limited.…”

Section: Introductionmentioning

confidence: 99%

Prediction and Experimental Study of Mass Transfer Properties of Micronanobubbles

Bai

Liu

Zhang

et al. 2021

Ind. Eng. Chem. Res.

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In order to study the mass transfer efficiency of micronanobubbles (MNBs), an equation of the volumetric mass transfer coefficient (k L a) was proposed based on theory and dimensionless numbers. It was verified by experimental data from different literature sources. Then, the k L a in an MNB column was measured under the conditions of different salt concentrations. The test results showed that the equation could successfully predict the k L a in an MNB column of not only this research but also other literature. In the MNB column, when the salt concentration increased from 0.0 to 3.0 g/L, the values of the Sauter mean bubble diameter (d BS ), gas holdup (ε), and specific gas−liquid interface (a) had remarkable changes. Salt coalescence suppression was the governing effect for the hydrodynamic variables, and it was more prominent for common bubbles than for MNBs. The value of the k L a in the MNB column was an order of magnitude larger than that in the common bubble column, and it was improved significantly in salt solution. Hydrodynamic variables were dominant effects of mass transfer. Overall, the prediction equation of the k L a provides a reference for the mass transfer rate calculation of MNBs.

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“…O uso do surfactante CTAB não alterou significativamente o diâmetro médio das microbolhas, diferente do SDS que reduziu o diâmetro médio das microbolhas (p<0.05). As imagens e as medidas de diâmetros de microbolhas com o uso dos surfactantes SDS e CTAB corroboram com os resultados apresentados no estudo de Zhang e Guiraud (84). Esses surfactantes são reagentes tensoativos capazes de reduzir a tensão superficial das interfaces líquido-gás que podem favorecer na diminuição da coalescência entre as microbolhas, manter a uniformidade no diâmetro médio das mesmas e conservar a espuma sobrenadante na solução (57,69,85).…”

Section: Discussionunclassified

Desenvolvimento e validação laboratorial de uma nova técnica de detecção de parasitos intestinais utilizando do princípio de flotação por ar dissolvido

Augusto Soares

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Agradeço a Deus pela graça da vida, por me conceder força e esperança no progresso como pessoa e profissional de ciência, a fé em Deus não pode ser explicada em obras como esta.À minha mãe, Eleonice Soares, por todo apoio e colaboração no enfrentamento às dificuldades, e todos os familiares que me deram motivação e força.À minha filha, Gabriela, e minha companheira, Viviane, que me confortaram nos dias difíceis e me ajudaram dia após dia a sorrir e sonhar.Ao meu orientador, Jancarlo Ferreira Gomes, por todos os incentivos, amizade, pelas palavras de conforto e ensinamentos transmitidos.Aos professores colaboradores em suas áreas de atuação, Alexandre Xavier

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Surface-modified microbubbles (colloidal gas aphrons) for nanoparticle removal in a continuous bubble generation-flotation separation system

Cited by 47 publications

References 39 publications

A comparative study of removal efficiency of organic contaminant in landfill leachate-contaminated groundwater under micro-nano-bubble and common bubble aeration

A comparative study of removal efficiency of organic contaminant in landfill leachate-contaminated groundwater under micro-nano-bubble and common bubble aeration

Prediction and Experimental Study of Mass Transfer Properties of Micronanobubbles

Desenvolvimento e validação laboratorial de uma nova técnica de detecção de parasitos intestinais utilizando do princípio de flotação por ar dissolvido

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