On the use of biosurfactants for the removal of heavy metals from oil‐contaminated soil

Mulligan, Catherine N.; Yong, Raymond N.; Gibbs, Bernard F.

doi:10.1002/ep.670180120

Cited by 89 publications

(46 citation statements)

References 8 publications

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“…For mixed phosphate and soapnut system, the phosphate concentration is fixed at 100 mM and soapnut concentration is varied. As expected, the extraction efficiency is found to increase with surfactant concentration due to the increasing number of micelle in higher surfactant concentration, facilitating the micellar solubilization of the pollutant from the surface of the soil particles (Mulligan 2005;Mulligan et al 1999 (Fig. 4bI).…”

Section: Effect Of Phosphate Concentrationsupporting

confidence: 69%

Arsenic removal from soil with high iron content using a natural surfactant and phosphate

Mukhopadhyay

Hashim

Allen

et al. 2013

Int. J. Environ. Sci. Technol.

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An environment friendly arsenic removal technique from contaminated soil with high iron content has been studied. A natural surfactant extracted from soapnut fruit, phosphate solution and their mixture was used separately as extractants. The mixture was most effective in desorbing arsenic, attaining above 70 % efficiency in the pH range of 4-5. Desorption kinetics followed Elovich model. Micellar solubilization by soapnut and arsenic exchange mechanism by phosphate are the probable mechanisms behind arsenic desorption. Sequential extraction reveals that the mixed soapnut-phosphate system is effective in desorbing arsenic associated with amphoteric-Fe-oxide forms. No chemical change to the wash solutions was observed by Fourier transform-infrared spectra. Soil:solution ratio, surfactant and phosphate concentrations were found to affect the arsenic desorption process. Addition of phosphate boosted the performance of soapnut solution considerably. Response surface methodology approach predicted up to 80 % desorption of arsenic from soil when treated with a mixture of &1.5 % soapnut, &100 mM phosphate at a soil:solution ratio of 1:30.

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Section: Effect Of Phosphate Concentrationsupporting

confidence: 69%

Arsenic removal from soil with high iron content using a natural surfactant and phosphate

Mukhopadhyay

Hashim

Allen

et al. 2013

Int. J. Environ. Sci. Technol.

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“…Biosurfactants are unique amphipathic molecules with properties that have been explored for a variety of industrial and bioremediation applications (4,6,19,28,37,47). From a clinical perspective, it is well known that some biosurfactants have antibiotic activity (5,6,60) and that at least one biosurfactant, rhamnolipid produced by Pseudomonas aeruginosa, has a role in the pathogenesis of this opportunistic pathogen (50).…”

mentioning

confidence: 99%

Distribution of Biosurfactant-Producing Bacteria in Undisturbed and Contaminated Arid Southwestern Soils

Bodour

Drees

Maier

2003

Appl Environ Microbiol

317

173

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Biosurfactants are a unique class of compounds that have been shown to have a variety of potential applications in the remediation of organic-and metal-contaminated sites, in the enhanced transport of bacteria, in enhanced oil recovery, as cosmetic additives, and in biological control. However, little is known about the distribution of biosurfactant-producing bacteria in the environment. The goal of this study was to determine how common culturable surfactant-producing bacteria are in undisturbed and contaminated sites. A series of 20 contaminated (i.e., with metals and/or hydrocarbons) and undisturbed soils were collected and plated on R 2 A agar. The 1,305 colonies obtained were screened for biosurfactant production in mineral salts medium containing 2% glucose. Forty-five of the isolates were positive for biosurfactant production, representing most of the soils tested. The 45 isolates were grouped by using repetitive extragenic palindromic (REP)-PCR analysis, which yielded 16 unique isolates. Phylogenetic relationships were determined by comparing the 16S rRNA gene sequence of each unique isolate with known sequences, revealing one new biosurfactant-producing microbe, a Flavobacterium sp. Sequencing results indicated only 10 unique isolates (in comparison to the REP analysis, which indicated 16 unique isolates). Surface tension results demonstrated that isolates that were similar according to sequence analysis but unique according to REP analysis in fact produced different surfactant mixtures under identical growth conditions. These results suggest that the 16S rRNA gene database commonly used for determining phylogenetic relationships may miss diversity in microbial products (e.g., biosurfactants and antibiotics) that are made by closely related isolates. In summary, biosurfactant-producing microorganisms were found in most soils even by using a relatively limited screening assay. Distribution was dependent on soil conditions, with gram-positive biosurfactant-producing isolates tending to be from heavy metal-contaminated or uncontaminated soils and gram-negative isolates tending to be from hydrocarbon-contaminated or cocontaminated soils.

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“…TCB separated or a heavy emulsion / TCB phase separated from the rest of the solution). APG, (Rosen, 1989;Martel and Gelinas, 1996;Mulligan et al, 1999).…”

Section: Separate Funnel Experimentsmentioning

confidence: 99%

“…The surfactant-enhanced soil flushing (SESF) extracts contaminants from soil matrices using a liquid medium such as an aqueous surfactant solution and/or bioactive agent solution (Fountain et al, 1991;Mulligan et al, 1999 (Wang and Mulligan, 2004). A major concern related to the effectiveness of SESF is surfactant losses.…”

Section: Introductionmentioning

confidence: 99%

The Effect of the Mixture of Nonionic Surfactant and Bioactive Agent for Surfactant-enhanced Soil Flushing (SESF) of TCB Contaminated Soil

Lee¹,

Cho²,

Chung³

2014

Journal of Soil and Groundwater Environment

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The objective of this study was to find the effect of the mixture of the nonionic surfactant and bioactive agent that solubilizes trichlorobenzene (TCB) present as a contaminant for surfactant-enhanced soil flushing (SESF). Three different nonionic surfactants and two different bioactive agents were obtained from four companies. Separate funnel experiments and shaker table agitation / centrifugation experiments were used for the test. Based on the separate funnel experimental results, three suitable mixture agents (APG + OSE, Brij 35 + MOSE, T-Maz 60 + MOSE) were selected. In the shaker table agitation / centrifugation experiments, these three different mixture agents were reduced to one (T-Maz 60 + MOSE). The maximum removal (95%) of TCB was obtained using a mixture of the nonionic surfactant and bioactive agent. Therefore, the used test methods and results can be used for SESF.

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On the use of biosurfactants for the removal of heavy metals from oil‐contaminated soil

Cited by 89 publications

References 8 publications

Arsenic removal from soil with high iron content using a natural surfactant and phosphate

Arsenic removal from soil with high iron content using a natural surfactant and phosphate

Distribution of Biosurfactant-Producing Bacteria in Undisturbed and Contaminated Arid Southwestern Soils

The Effect of the Mixture of Nonionic Surfactant and Bioactive Agent for Surfactant-enhanced Soil Flushing (SESF) of TCB Contaminated Soil

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