Investigation of the release of PAHs from artificially contaminated sediments using cyclolipopeptidic biosurfactants

Portet‐Koltalo, Florence; Ammami, Mohamed Tahar; Benamar, Ahmed; Wang, H.; Derf, Franck Le; Duclairoir‐Poc, Cécile

doi:10.1016/j.jhazmat.2013.07.062

Cited by 33 publications

(13 citation statements)

References 33 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Although the least applied concentration of Tween80 is higher than the CMC of this surfactant (16 mg/L) [1], no significant desorption was observed. The reason for this occurrence is that in the soil surfactant solution system, due to the sorption of surfactant onto the soil particles, CMC would be greater than that of the liquid system, which is called effective CMC (CMC eff ) [5,15,23]. By increasing the surfactant concentration beyond the CMC eff , the sorbed amount of the surfactant reaches the stationary level and surfactant micelles begin to form in the aqueous phase, resulting in partitioning of PHE molecules within hydrophobic cores of the surfactant micelles [24].…”

Section: Resultsmentioning

confidence: 99%

“…Thanks to their low volatility, hydrophobic nature and high octanol-water partition coefficients (K ow ), these ubiquitous compounds are severely adsorbed onto the soil grains being very recalcitrant to degradation [1,3]. Therefore, PAHs-contaminated sites are potentially serious threats to both environmental resources and human health, duo to their bioaccumulation potential and extreme toxicity, mutagenicity and carcinogenicity impacts, posing the remediation of contaminated soils as a principal challenge [4,5]. In the last few decades, some environmental clean-up technologies including bioremediation, advanced chemical oxidation, electrochemical treatment, soil flushing, and soil washing have been applied for the remediation of PAHs-contaminated soils [6][7][8][9][10][11][12].…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Desorption kinetics and isotherms of phenanthrene from contaminated soil

Gharibzadeh

Kalantary

Esrafili

et al. 2019

J Environ Health Sci Engineer

View full text Add to dashboard Cite

Background Prediction of polycyclic aromatic hydrocarbons (PAHs) desorption from soil to estimate available fraction regarding to initial concentration of the contaminant is of great important in soil pollution management, which has poorly been understood until now. In the present study estimation of fast desorption fraction which is considered as available fraction was conducted by evaluating desorption kinetics of phenanthrene (a three ring PAH) from artificially contaminated soils through the mathematical models. Methods Desorption rate of phenanthrene (PHE) was investigated by using the nonionic surfactant Tween80 in a series of batch experiments. The effects of reaction time from 5 to 1440 min and initial PHE concentration in the range of 100-1600 mg/kg were studied. Results Available fractions of the contaminant were achieved within the first hour of desorption process as the system reached to equilibrium conditions. Experimental data were examined by using kinetic models including pseudo-first-order, pseudo-secondorder in four linearized forms, and fractional power. Among the models tested, experimental data were well described by pseudosecond-order model type (III) and (IV) and fractional power equation. Fast desorption rates, as Available fractions were determined 79%, 46%, 40%, 39%, and 35% for initial PHE concentrations of 100, 400, 800, 1200, and 1600 mg/kg respectively. Among the evaluated isotherm models, including Freundlich, Langmuir in four linearized forms, and Temkin, the equilibrium data were well fitted by the first one. Conclusion Applying the nonionic surfactant Tween80 is a useful method to determine available fraction of the contaminant. This method will provide the management of contaminated sites by choosing a proper technique for remediation and predicting achievable treatment efficiency.

show abstract

Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Desorption kinetics and isotherms of phenanthrene from contaminated soil

Gharibzadeh

Kalantary

Esrafili

et al. 2019

J Environ Health Sci Engineer

View full text Add to dashboard Cite

show abstract

“…However, the bioremediation of PAHs is restricted by their low bioavailability, which results from their poor aqueous solubility, high hydrophobicity, and strong sorption to sediment or soil particles (Malik, Verma, Singh, & Singh, 2011). Enhancing the solubility of PAHs and promoting desorption from contaminated soil is a prerequisite for their bioremediation (Portet-Koltalo et al, 2013).…”

Section: Introductionmentioning

confidence: 99%

Desorption and solubilization of anthracene by a rhamnolipid biosurfactant from Rhodococcus fascians

Kim

Lee

Heo

et al. 2019

Water Environment Research

View full text Add to dashboard Cite

The rhamnolipid biosurfactant‐producing bacterium, strain SDRB‐G7, was isolated from the sediment of Sindu‐ri beach and identified as Rhodococcus fascians based on a phylogenetic analysis. Optimal activity, with the highest yield (2.441 g/L) and surface tension‐reducing activity (24.38 mN/m), was observed when the cells were grown on olive oil as their sole source of carbon at pH 8.0. The rhamnolipid biosurfactant showed environmental stability at a variety of NaCl concentrations (2‐20%) and pH values (2‐12) even under acidic conditions. Of the initial anthracene, 66% was solubilized by 100% crude biosurfactant. Furthermore, 100% crude biosurfactant desorbed 81% of the anthracene in sediment into the aqueous phase. These results suggest that the rhamnolipid biosurfactant produced from R. fascians SDRB‐G7 is a promising candidate for polycyclic aromatic hydrocarbon (PAH) removal from the sediment and can be an effective agent for processes that bioremediate PAHs such as surfactant‐enhanced remediation. Practitioner points Biosurfactants can accelerate desorption of PAHs and improve their solubility. BS‐producing R. fascians SDRB‐G7 was selected by screening of biochemical tests. Solubility of anthracene was enhanced by rhamnolipid produced by strain SDRB‐G7. Microbial surfactant is a promising alternative for bioremediation of PAH‐polluted sites.

show abstract

“…Previous studies have mostly focused on the sorption behaviour of polycyclic aromatic hydrocarbons (PAHs) on the sediments, including effects of oil type, mixing time, temperature, and salinity [15][16][17][18][19]. Nevertheless, only a few studies focused on the desorption of oil pollutants from oil-contaminated sediments.…”

Section: Introductionmentioning

confidence: 99%

Effects of Wave Conditions and Particle Size on the Release of Oil from Oil-Contaminated Sediments in a Wave Tank

et al. 2019

JMSE

View full text Add to dashboard Cite

The floating oil can drift to the coastal areas and interact with the shoreline substrates after oil spill accidents. This process is demonstrated to be the cause of the formation of oil-contaminated sediments, which has attracted much attention. However, no systematic study has concerned the desorption process of oil from oil-contaminated sediments when the coastal hydrodynamic conditions change. This work determines the effects of wave conditions and particle size on the release of oil from artificially prepared sediments in a wave tank. Nonlinear fitting results show that the oil release kinetic curves can be correctly estimated with the Lagrangian first-order (LFO) first-order equation. Under different test conditions. The oil concentration in the water increases rapidly within 6 h. However, the oil desorption is inhibited thereafter and the process of sorption occurs dominantly. Under higher wave energy, the process of desorption is significantly enhanced and more large oil droplets release from sediments. Under the same wave condition, small oil droplets firstly release from the sediments. Besides, more oil especially with a larger size can release from larger sediment while oil releases more quickly from smaller sediment.

show abstract

Investigation of the release of PAHs from artificially contaminated sediments using cyclolipopeptidic biosurfactants

Cited by 33 publications

References 33 publications

Desorption kinetics and isotherms of phenanthrene from contaminated soil

Desorption kinetics and isotherms of phenanthrene from contaminated soil

Desorption and solubilization of anthracene by a rhamnolipid biosurfactant from Rhodococcus fascians

Effects of Wave Conditions and Particle Size on the Release of Oil from Oil-Contaminated Sediments in a Wave Tank

Contact Info

Product

Resources

About