Solubilization kinetics for polycyclic aromatic hydrocarbons transferring from a non-aqueous phase liquid to non-ionic surfactant solutions

Bernardez, L. A.; Ghoshal, Subhasis

doi:10.1016/j.jcis.2007.12.035

Cited by 21 publications

(16 citation statements)

References 37 publications

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“…A detailed description of the experimental apparatus, materials and measuring techniques for the dissolution experiments is given elsewhere [17,18,20,21]. Here we will present a brief summary of the experimental aspects of the work.…”

Section: Methodsmentioning

confidence: 99%

“…Brij 35 is useful for the solubilization of membrane proteins and can also entrap hydrophobic reactants in liquid-phase enzyme reactions. Surfactant Brij 35 is one of the most commonly used non-ionic surfactant employed in many experimental studies on solubilization and biodegradation of hydrophobic organic compounds [9,17,18,20,21].…”

Section: Napl and Surfactant Solution Preparationmentioning

confidence: 99%

“…A detailed description of the results for the dissolution experiments is given elsewhere [17,18]. The dissolution of PAHs into pure water and into solution of Brij 35 across the NAPL-wetted membrane was measured at doses varying from 1 to 100 times the CMC [18].…”

Section: Dissolution Experimentsmentioning

confidence: 99%

“…A rotating disk apparatus, which the NAPL-water interfacial area was maintained constantly by a membrane, was conceived and successfully used to investigate the mass transfer of naphthalene and phenanthrene from a non-aqueous phase liquid into a nonionic surfactant solution [17,18].…”

Section: Introductionmentioning

confidence: 99%

“…First, equilibrium solubilization experiments were performed to improve the understanding of partitioning of PAHs in the nonionic surfactant solutions in multi-solute systems and to quantify equilibrium surfactant solubilization of target PAHs. Next, the kinetics of solubilization of PAHs in the Brij 35 solutions from NAPLs was studied [17,18]. Finally, with prior assessment of solubilization, mass transfer process and the mechanisms that control the dissolution of PAHs in NAPL-surfactant systems, the effects of the surfactant on the biodegradation extent and rates were investigated.…”

Section: Introductionmentioning

confidence: 99%

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A rotating disk apparatus for assessing the biodegradation of polycyclic aromatic hydrocarbons transferring from a non-aqueous phase liquid to solutions of surfactant Brij 35

Bernardez

2008

Bioprocess Biosyst Eng

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A rotating disk apparatus was used to investigate the biodegradation of PAHs from non-aqueous phase liquids to solutions of Brij 35. The mass transfer of PAHs in absence of surfactant solution was not large enough to replenish the degraded PAHs. The addition of surfactant resulted in an overall enhancement of biodegradation rates compared to that observed in pure aqueous solution. This is because surfactant partition significant amount of PAHs into the bulk phase, where uptake occurs but the supply of PAHs to the aqueous phase through micellar solubilization at latter period limited biodegradation rates. It was demonstrated the relationship between biodegradation rate and surfactant dose and the mechanisms controlling the mass transfer of PAH from NAPLs. The satisfactory comparison of the experimental data with the predictions of a model, which parameters were determined from independent solubilization and dissolution experiments and based on the main assumption that the solutes must be present in the true aqueous phase to be degraded, allows us to conclude the absence of direct uptake of PAHs by bacteria.

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Section: Methodsmentioning

confidence: 99%