Electroflotation of quartz fines

Ketkar, D.R.; Mallikarjunan, R.; Venkatachalam, S.

doi:10.1016/0301-7516(91)90009-8

Cited by 65 publications

(36 citation statements)

References 7 publications

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“…Many researches have been carried out on the performance of different ALBs; however, these studies were carried out all based on conventional gas supply system. There are few studies on the effects of microbubbles on ALB performance, because normally the microbubble generation systems, for instance DAF, electro-flotation, electrostatic spraying, and mechanical agitation etc, were not profitable to be applied into most bio-processes due to their high energy cost [8][9][10][11][12]. Recently, an innovative microbubble generation system (fluidic oscillator) with lower power consumption has been invented by Zimmerman et al [13,14] with the benefits of energy saving and improved efficiency.…”

Section:        mentioning

confidence: 99%

“…The percentage improvement of K L a is therefore determined by the percentage difference of the total interfacial areas for a certain dosing flow rate. Combining Equation (7) and Equation (4), the percentage increase in K L a is correlated to bubble diameter (d B ) and gas hold-up (ε), described by Equation (8).…”

Section: The Improvement Of K L a By Using Fluidic Oscillatormentioning

confidence: 99%

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Enhanced Mass Transfer in Microbubble Driven Airlift Bioreactor for Microalgal Culture

Ying¹,

Al-Mashhadani²,

Hanotu³

et al. 2013

ENG

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In this study, the effect of microfluidic microbubbles on overall gas-liquid mass transfer (CO 2 dissolution and O 2 removal) was investigated under five different flow rates. The effect of different liquid substrate on CO 2 mass transfer properties was also tested. The results showed that the K L a can be enhanced by either increasing the dosing flowrate or reducing the bubble size; however, increasing the flow rate to achieve a higher K L a would ultimately lower the CO 2 capture efficiency. In order to achieve both higher CO 2 mass transfer rate and capture efficiency, reducing bubble size (e.g. using microbubbles) has been proved more promising than increasing flow rate. Microbubble dosing with 5% CO 2 gas showed improved K L a by 30% -100% across different flow rates, compared to fine-bubble dosing. In the real algal culture medium, there appears to be two distinct stages in terms of K L a, divided by the pH of 8.4.

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Section:        mentioning

confidence: 99%

Section: The Improvement Of K L a By Using Fluidic Oscillatormentioning

confidence: 99%

Enhanced Mass Transfer in Microbubble Driven Airlift Bioreactor for Microalgal Culture

Ying¹,

Al-Mashhadani²,

Hanotu³

et al. 2013

ENG

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“…Estes dois gases podem ser utilizados separadamente ou em conjunto. Diferentes autores (Sarkar, 2010;Gupta e Ali, 2012;Vu et al, 2014;Baierle et al, 2015) descrevem a complexidade no domínio do processo de eletroflotação; esta tecnologia implica no controle de diferentes fatores na produção e no tamanho de bolhas, tais como: densidade de corrente, material e tipo de eletrodo, concentração de eletrólito e pH do sistema (Ketkar et al, 1991;Chen, 2004;Jimenez et al, 2010;Sun et al, 2011;Ren et al, 2014a).…”

Section: Gram-positiva (A C); Gram-negativa (B D) (Adaptado Deunclassified

“…Esta tecnologia vem sendo estudada com muita ênfase no tratamento de efluentes Chen, 2004;Gao et al, 2005;Mansour e Kesentini, 2008;Merzouk et al, 2010;Adjeround et al, 2015;Baierle et al, 2015). Poucos estudos (Raju e Khangaonkar, 1984;Ketkar et al, 1991;Sarkar et al, 2010;Sun et al, 2011;Ren et al, 2014) têm sido realizados na área de flotação mineral. Este processo é capaz de produzir bolhas de hidrogênio e oxigênio menores a 100 µm, este fato o diferência das outras técnicas de flotação convencional, possibilitando assim a flotação de partículas finas e ultrafinas.…”

Section: Justificativa E Relevância Do Trabalhounclassified

“…Desta forma, em uma faixa de pH ácido (3 e 5) existirá uma interação eletrostática repulsiva entre as bolhas e o eletrodo, assim as bolhas de oxigênio terão um menor tempo de crescimento facilitando seu desprendimento. (Ketkar et al, 1991;Jiménez et al, 2010;Sun et al, 2011e Alam, 2015 Figura se observa que para toda a faixa de pH os diâmetros das bolhas de hidrogênio e oxigênio diminuíram com o aumento da densidade da corrente, o que está de acordo com a teoria da nucleação e crescimento de uma nova fase sobre um eletrodo (Ketkar et al, 1991;Jones et al, 1999;Maris, 2006;Jo et al, 2014e Alam, 2015 ). Portanto, a densidade de corrente influencia direta ou indiretamente no diâmetro das bolhas produzidas no processo eletrólise da água.…”

Section: Bolhas De Oxigêniounclassified

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Eletroflotação De Partículas Finas De Hematita Em Célula Modificada De Partridge Smith Usando Rhodococcus Opacus Como Biorreagente

HACHA¹

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Eletroflotação de partículas finas de hematita em célula modificada de Partridge Smith usandoRhodococcus opacus como biorreagente This work aims to evaluate the electroflotation of hematite fine particles in a modified Partridge Smith cell using Rhodococcus opacus. A hematite sample with grade 96% was used in this study; additionally, three granulometric fractions were selected: -53+38; -38+20 and -20 micrometers. The variables studied were pH, reagent concentration and current density. Zeta potential measurements and analysis by infrared spectroscopy were carried out to assess the interaction before and after reagents interaction. In order to gain a better understanding of the bubble diameter influence in the process, measurements of the diameter of hydrogen and oxygen bubbles were done. The average bubble diameter (d 32 ) was found in the range of 40 to 60 micrometers for the hydrogen bubbles and of 50 to 70 micrometers for the oxygen bubbles. Finally, electrocoagulation assays the hematite with R. opacus and sodium oleate were carried out. The reduction in particle size favored the floatability of hematite; this fact can be related to the bubble size generated in the process and the ability of R. opacus to form floccules through the interaction of Van der Waals. On the other hand, the increase of reagent concentration (R. opacus and sodium oleate) favored the floatability of hematite. Suitable pH values for hematite flotation were found around 6 and 7 for R. opacus and sodium oleate, respectively. Maximum hematite floatability with R. opacus using hydrogen bubbles was around 80% and around 65% with oxygen bubbles. Sodium oleate presented a better performance reaching a maximum floatability of approximately 98% for hydrogen bubbles and around 90% for oxygen bubbles. The characteristics of the bacterial surface and the bubble size were determinant factors in the hematite floatability. Therefore, the electroflotation process using R. opacus as collector is a potential technology regarding environmental issues found with the synthetic reagents.

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Electrochemically Mediated Sustainable Separations in Water

Tan

Hatton

2022

Sustainable Separation Engineering

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Electroflotation of quartz fines

Cited by 65 publications

References 7 publications

Enhanced Mass Transfer in Microbubble Driven Airlift Bioreactor for Microalgal Culture

Enhanced Mass Transfer in Microbubble Driven Airlift Bioreactor for Microalgal Culture

Eletroflotação De Partículas Finas De Hematita Em Célula Modificada De Partridge Smith Usando Rhodococcus Opacus Como Biorreagente

Electrochemically Mediated Sustainable Separations in Water

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