Effect of electrolytes in aqueous solutions on oxygen transfer in gas–liquid bubble columns

Baz-Rodríguez, Sergio A.; Botello-Álvarez, José Enrique; Estrada-Baltazar, Alejandro; Vilchiz-Bravo, Luis Enrique; Padilla-Medina, José A.; Miranda-López, Rita

doi:10.1016/j.cherd.2014.02.023

Cited by 34 publications

(22 citation statements)

References 36 publications

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“…At high viscosity, working under pressure may have a positive effect on the turbulence induced by the bubbles: their number would be higher while d B remains nearly constant (section 3.1.3 for the concomitant effect of viscosity and pressure). Baz-Rodríguez et al (2014) observe a decrease of k L while increasing u G (in a small range and for low u G ) and report another effect: k L is higher for isolated bubbles than for bubble swarms due to lower rise velocity for bubble swarms. Another effect is reported by De Swart et al (1996) who found an increasing effect of k L in presence of frequent bubble coalescence and breakage which is the case in the heterogeneous flow at high gas velocity.…”

Section: Working Mode Effect On Mass Transfer Propertiesmentioning

confidence: 87%

“…They also attributed this decrease to the decrease of the bubble size and they report that k L is proportional to d b 1/2 . Baz- Rodríguez et al (2014) also report a decrease of k L when bubble diameter decreases (by adding coalescence inhibiting salts) while k L a and a increase in the homogeneous regime. Hashemi et al (2009) report a decrease of the ratio k L /d B while increasing pressure.…”

Section: Figurementioning

confidence: 92%

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Bubble column reactors for high pressures and high temperatures operation

Leonard

Ferrasse

Boutin

et al. 2015

Chemical Engineering Research and Design

103

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Section: Working Mode Effect On Mass Transfer Propertiesmentioning

confidence: 87%

Section: Figurementioning

confidence: 92%

Bubble column reactors for high pressures and high temperatures operation

Leonard

Ferrasse

Boutin

et al. 2015

Chemical Engineering Research and Design

103

View full text Add to dashboard Cite

“…For example, by adding internals [18][19][20][21] or changing operation conditions, [22][23][24] the bubble diameter can be effectively decreased, and thus the interfacial area increased. Alcohols, 25,26 surfactants 8,[27][28][29] and electrolytes [30][31][32] are typically added in coalescence systems to inhibit bubble coalescence 33 and increase bubble rigidity, 34 by which bubbles become smaller and a larger interfacial area is obtained. When the bubble size decreases to several micrometers (i.e., microbubbles [35][36][37] ), they exhibit unique properties, 38 e.g.…”

Section: Introductionmentioning

confidence: 99%

Effects of bubble size on the gas–liquid mass transfer of bubble swarms with Sauter mean diameters of 0.38–4.88 mm in a co‐current upflow bubble column

Wang

Guo

Liu

et al. 2020

J of Chemical Tech & Biotech

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BACKGROUND: Bubble columns have found a wide range of application in biochemical industry. Mass transfer in the bubble column can be manipulated by adjusting the bubble size. Thus, for the design of bubble columns, it is necessary to investigate the behaviors of different-sized bubbles. This work attempts to study the global hydrodynamic and mass transfer characteristics of bubble swarms with Sauter mean diameters (d 32) of 0.38-4.88 mm, from microbubbles to millimeter-sized bubbles, in a co-current bubble column. RESULTS: The specific interfacial areas of the bubble swarms with d 32 of 0.38-1.47 (generated by ceramic membrane module) and 1.05-4.88 mm (generated by plate gas distributor) are 250-1100 and 7-270 m −1 , respectively. The liquid-side mass transfer coefficient (k L) of those two kinds of bubbles are (0.45-1.16) × 10 −4 and (0.58-7.65) × 10 −4 m s −1 , respectively. CONCLUSION: Decreasing the bubble size can effectively increase the volumetric mass transfer coefficient (k L a), especially when the bubble size decreases to several micrometers. The major contribution to the mass transfer enhancement results from the increase of the specific interfacial area. Conversely, the k L decreases clearly. It is demonstrated that Higbieʼs and Frosslingʼs equations can approximate the k L of the bubble swarms with d 32 > 2 mm and d 32 < 2 mm in the bubble column, respectively.

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“…The normalised k-value (k N ; -) describes the slope of the linear increase in f S until c Salt /CCC Salt = 1.0 and f S reaches f S,max . Since only the diffuser membrane design and q A,Disc affects f S,max or bubble diameter, but not the salt type [2,[11][12][13], it is reasonable that solutions of different salts and salt mixtures with the same c Salt /CCC Salt ratio and aerated with the same diffuser would present similar f S values. Other studies already showed the advantages of using a dimensionless concentration as independent parameter for analyses of hydrodynamics and oxygen transfer with different salt solutions in bubble columns [13][14][15].…”

Section: Modified Design Approach For Considering Salt Effect On K L Amentioning

confidence: 99%

Oxygen Transfer of Fine-Bubble Aeration in Activated Sludge Treating Saline Industrial Wastewater

Behnisch

Schwarz

Trippel

et al. 2022

Water

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Aeration is usually the most energy-intensive part of the activated sludge process, accounting for 50% to 80% of the total requirement. To achieve high efficiency, designers and operators of WWTPs must, therefore, consider all influencing factors, including salinity. With increasing salinity, oxygen transfer increases compared to tap water (TW), due to the inhibition of bubble coalescence. Previous saline water (SW) experiments showed that by using small slits in the diffuser membrane design, oxygen transfer and aeration efficiency increase further. In this study, we present a modified approach for considering the salt effect on oxygen transfer and assess the transferability of SW results to saline-activated sludge (sAS) conditions. Therefore, we operated a pilot-activated sludge plant over 269 days with a saline industrial wastewater influent. The oxygen transfer of disc-diffusers with two different membrane designs was measured continuously via the off-gas method. The salt concentration (cSalt) measured via ion analysis ranged between 4.9 and 11 g/L. Despite a high cSalt fluctuation, COD elimination was >90% all the time. Our results confirm previous SW results. Oxygen transfer in sAS is up to three times higher compared to non-saline conditions. Aeration efficiency shows that despite a higher pressure drop, diffusers with smaller slits are to be recommended in order to improve aeration in sAS.

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Effect of electrolytes in aqueous solutions on oxygen transfer in gas–liquid bubble columns

Cited by 34 publications

References 36 publications

Bubble column reactors for high pressures and high temperatures operation

Bubble column reactors for high pressures and high temperatures operation

Effects of bubble size on the gas–liquid mass transfer of bubble swarms with Sauter mean diameters of 0.38–4.88 mm in a co‐current upflow bubble column

Oxygen Transfer of Fine-Bubble Aeration in Activated Sludge Treating Saline Industrial Wastewater

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