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, L. A.

doi:10.1007/s00449-008-0261-1

Cited by 7 publications

(4 citation statements)

References 25 publications

(47 reference statements)

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“…Schematic of rotating disk apparatus L. A. Bernardez (2009) studied the biodegradation of polycyclic aromatic hydrocarbons (PAHs) (naphthalene and phenanthrene) in a nonionic surfactant solution of Brij 35 using a rotating disk apparatus, and demonstrated a relationship between the biodegradation rate and surfactant amount and the mechanisms controlling the mass transfer of PAH from non-aqueous phase liquid (NAPLs). A 250 ml liquid solution was used for a pure mineral solution or a mineral solution with surfactant.…”

Section: Drag Reduction Using Rotating Disk Apparatus (Rda)mentioning

confidence: 99%

Rotating Disk Apparatus: Types, Developments and Future Applications

Rashed¹,

Abdulbari²,

Salleh³

et al. 2016

MAS

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Power consumption reduction investigations attracted the attention of enormous numbers of researchers in the past few decades due to its high academic and economic impacts. The pumping power losses during the transportation of crude oils are considered as one of the main power consuming applications due to the turbulent mode of transportation. Investigating the possible solutions for this problem is expensive and time consuming due to the large apparatuses needed to simulate the flow in real pipelines. Rotating disk apparatus (RDA) is an instrument mainly comprising a rotating disk and an electrical motor to rotate the disk, which was implemented as an efficient and economical path to simulate what can be done in pipelines through generating a controlled degree of turbulence. This technique was also used in many other scientific applications due to its dynamic mode of operation. For example, a rotating disk electrode was used in electrodeposition processes and to characterize deposition film thickness and uniformity. The rotating disk reactor was employed to investigate the reaction rate between fluids and solid surfaces. The present work evaluates the RDA from different prospective and applications in order to introduce it as an efficient research tools for future dynamic investigations.

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Section: Drag Reduction Using Rotating Disk Apparatus (Rda)mentioning

confidence: 99%

Rotating Disk Apparatus: Types, Developments and Future Applications

Rashed¹,

Abdulbari²,

Salleh³

et al. 2016

MAS

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“…For example, Brij 35 surfactant has been shown to significantly increase the biodegradation rates of naphthalene and PHE in NAPLs compared to purely aqueous solution. 16 However, while surfactants facilitate mass transfer, they can also have unforeseen consequences. Many laboratory studies neglect the potential detrimental effects of surfactants, such as their ability to detach microbial cells from the oil−water interface.…”

Section: ■ Introductionmentioning

confidence: 99%

“…For the surfactant-mediated uptake mode, surfactants can enhance PAH uptake by emulsifying the NAPL and increasing mass transfer of dissolved PAHs toward the microorganisms. For example, Brij 35 surfactant has been shown to significantly increase the biodegradation rates of naphthalene and PHE in NAPLs compared to purely aqueous solution . However, while surfactants facilitate mass transfer, they can also have unforeseen consequences.…”

Section: Introductionmentioning

confidence: 99%

“…Polycyclic aromatic hydrocarbons (PAHs) are ubiquitous environmental pollutants posing significant threats due to their carcinogenicity and mutagenicity. 1 This concern is reflected in the U.S. Environmental Protection Agency's inclusion of 16 PAHs on its priority pollutant list. 2 Their hydrophobic nature leads to persistence in nonaqueous-phase liquids (NAPLs) like coal tar, creosote, and leaked petroleum, further increasing their environmental threat.…”

Section: ■ Introductionmentioning

confidence: 99%

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From Antagonism to Enhancement: Triton X-100 Surfactant Affects Phenanthrene Interfacial Biodegradation by Mycobacteria through a Shift in Uptake Mechanisms

Wang,

Zhang,

et al. 2024

Langmuir

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Polycyclic aromatic hydrocarbons (PAHs), as persistent environmental pollutants, often reside in nonaqueous-phase liquids (NAPLs). Mycobacterium sp. WY10, boasting highly hydrophobic surfaces, can adsorb to the oil–water interface, stabilizing the Pickering emulsion and directly accessing PAHs for biodegradation. We investigated the impact of Triton X-100 (TX100) on this interfacial uptake of phenanthrene (PHE) by Mycobacteria, using n-tetradecane (TET) and bis-(2-ethylhexyl) phthalate (DEHP) as NAPLs. Interfacial tension, phase behavior, and emulsion stability studies, alongside confocal laser scanning microscopy and electron microscope observations, unveiled the intricate interplay. In surfactant-free systems, Mycobacteria formed stable W/O Pickering emulsions, directly degrading PHE within the NAPLs because of their intimate contact. Introducing low-dose TX100 disrupted this relationship. Preferentially binding to the cells, the surfactant drastically increased the cell hydrophobicity, triggering desorption from the interface and phase separation. Consequently, PAH degradation plummeted due to hindered NAPL access. Higher TX100 concentrations flipped the script, creating surfactant-stabilized O/W emulsions devoid of interfacial cells. Surprisingly, PAH degradation remained efficient. This paradox can be attributed to NAPL emulsification, driven by the surfactant, which enhanced mass transfer and brought the substrate closer to the cells, despite their absence at the interface. This study sheds light on the complex effect of surfactants on Mycobacteria and PAH uptake, revealing an antagonistic effect at low concentrations that ultimately leads to enhanced degradation through emulsification at higher doses. These findings offer valuable insights into optimizing bioremediation strategies in PAH-contaminated environments.

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Bioavailability of organic compounds solubilized in nonionic surfactant micelles

Wang

2010

Appl Microbiol Biotechnol

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Whether direct availability of organic compound solubilized in nonionic surfactant micelles (bioavailability) in a bioremediation or biotransformation process is uncertain to some extent, which is partially attributed to the difficulty by direct experimental determination. In another point of view, it should be ascribed to the fuzzy concept about the solubilization of organic compound in a nonionic surfactant micelle aqueous solution. In this mini-review, the solubilization of organic compound in surfactant micelles aqueous solution is fully discussed; especially saturated solubilization and unsaturated solubilization have been emphasized. Then the current methods for estimation of bioavailability of organic compounds solubilized in micelles are introduced, in which the possible drawbacks of each method are stressed. Finally, the conclusion that organic compound solubilized in micelles is unavailable directly by microbes has been drawn and the intensification of bioremediation or biotransformation by nonionic surfactant micelle aqueous solution is contributed to enhancement of the hydrophobic organic compounds dissolution.

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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

Cited by 7 publications

References 25 publications

Rotating Disk Apparatus: Types, Developments and Future Applications

Rotating Disk Apparatus: Types, Developments and Future Applications

From Antagonism to Enhancement: Triton X-100 Surfactant Affects Phenanthrene Interfacial Biodegradation by Mycobacteria through a Shift in Uptake Mechanisms

Bioavailability of organic compounds solubilized in nonionic surfactant micelles

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