Hydrodynamic study and optimization strategy for the surfactant recovery from aqueous solutions

Tadakamalla, Keerthi; Marathe, Kumudini V.

doi:10.1016/j.desal.2010.08.008

Cited by 13 publications

(6 citation statements)

References 24 publications

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“…nificant changes with regard to the values obtained for the carbon dioxide/water system, in agreement with other researches using different surfactants [15,16]. The hydrodynamic characterization of the gas-liquid systems in the present work includes the analysis of the bubble size distribution produced in the bubble column.…”

Section: Resultssupporting

confidence: 87%

Effect of Tween 80 on Bubble Size and Mass Transfer in a Bubble Contactor

et al. 2011

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Gas absorption in aqueous solutions with Tween 80 and absorption processes based on hydrodynamics and mass transfer is determined. The impact of surfactant concentration on gas holdup and gas-liquid interfacial area is analyzed, observing an increase of these parameters with surfactant concentration. The influence of liquid-phase contamination on the absorption process is investigated on the basis of the liquid-film mass transfer coefficient, removing the effect caused by the presence of a surfactant and the gas flow rate on the interfacial area and, thereby, on the volumetric mass transfer coefficient. The opposite effect on the mass transfer coefficient can be observed which decreases in the presence of the surfactant.

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Section: Resultssupporting

confidence: 87%

Effect of Tween 80 on Bubble Size and Mass Transfer in a Bubble Contactor

et al. 2011

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“…These findings are consistent with the data reported in the literature. 63 Surfactant Recovery. The recovery (ρ) of the SDBS is important for its reuse.…”

Section: ■ Results and Discussionmentioning

confidence: 99%

Removal and Recovery of an Anionic Surfactant in the Presence of Alcohol by Foam Fractionation

Kumar

Ghosh

2022

Ind. Eng. Chem. Res.

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Surfactants are used extensively in the production of numerous consumer products. However, in many circumstances, they also contaminate water. As a result, the removal of surfactant and its recovery have become critical issues. In this work, the removal and recovery of an anionic surfactant [i.e., sodium dodecyl benzene sulfonate (SDBS)] from water by foam fractionation have been studied at 298 K in the presence of methanol and ethanol. The study was done at and above the critical micelle concentration of SDBS. The concentrations of SDBS were 500, 1000, 2000, and 3000 mg dm–3. The air flow rate (AFR) was varied in the range of 0.4–1.6 dm3 min–1. About 77% of the surfactant was recovered from the top of the column in the form of a semi-solid paste. The addition of alcohol lowered the foam volume and surfactant recovery. The enrichment ratio decreased with increasing AFR. The zeta potential at the air–water interface was measured to determine the stability of the foam, which was a significant factor in surfactant recovery. The surface tension measurements revealed the surfactant’s adsorption capacity at the air–water interface. About 95% of water was recovered in the process. The findings from this study would be important for surfactant applications in a variety of domains.

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“…Percentage removal and enrichment ratio are the two key parameters related to the separation of a solute (dye) in the foam fractionation column. Percentage removal (R) indicates the reduction in dye concentration (in %) with respect to dye concentration in the feed solution, expressed as [49][50][51][52][53]:…”

Section: Separation Efficiencymentioning

confidence: 99%

“…where   (ppm) and   (ppm) are the dye concentration in the feed solution and the remaining liquid solution (bottom of the column), respectively. Enrichment ratio (E) indicates how many times the foam gets enriched with dye relative to feed concentration, expressed as [49]:…”

Section: Separation Efficiencymentioning

confidence: 99%

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Dye separation using a semi-batch foaming process: Process optimization using Taguchi methodology and Grey relational analysis

Bharadwaj

Gupta

2020

Environmental Engineering Research

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Foam fractionation is one of the novel techniques used nowadays for the wastewater treatment. The present paper discusses the removal of methylene blue dye by using a surfactant, sodium dodecyl sulfate, as a collector, by semi-batch foam fractionation technique. The influence of operating variables like aeration rate (150 – 250 mL.min<sup>-1</sup>), liquid height (600 – 900 mL), dye concentration (5 – 25 ppm), pH (3 – 10), surfactant dose (250 – 2000 ppm) on percentage removal, enrichment ratio and surface excess were investigated. The results revealed fairly high percentage removals at various operating conditions due to strong electrostatic interaction between dye and surfactant. Further, in order to augment separation, optimization was performed by employing Taguchi-based experimental design followed by Grey relational analysis (GRA) technique. The optimal conditions were found to be: 150 mL.min<sup>-1</sup> air flow rate, 600 mL liquid loading and 5 ppm dye concentration for percentage removal of 95.7% and an enrichment ratio of 7.49. The analysis of variance (ANOVA) suggested dye concentration to be the most influencing operating variable. Lastly, the equilibrium relationship between bulk and surface phase was established which qualitatively indicates as to how much the actual process departs from equilibrium.

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Hydrodynamic study and optimization strategy for the surfactant recovery from aqueous solutions

Cited by 13 publications

References 24 publications

Effect of Tween 80 on Bubble Size and Mass Transfer in a Bubble Contactor

Effect of Tween 80 on Bubble Size and Mass Transfer in a Bubble Contactor

Removal and Recovery of an Anionic Surfactant in the Presence of Alcohol by Foam Fractionation

Dye separation using a semi-batch foaming process: Process optimization using Taguchi methodology and Grey relational analysis

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