Estimation of pollutant partition in sandy soils with different water contents

Albergaria, José Tomás; Alvim-Ferraz, M.C.M.; Delerue–Matos, Cristina

doi:10.1007/s10661-009-1269-y

Cited by 15 publications

(10 citation statements)

References 18 publications

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“…This can be explained by the good accessibility of the air to the pores in the case of dry soil. These results confirmed those obtained by Amin et al [4], but differs from the results of Albergaria et al [1,2] and Soares et al [20]. This difference can be due to the size particles of used soils.…”

Section: Resultssupporting

confidence: 88%

“…Soares et al [20] found that SVE is extremely efficient for the remediation of sandy soils contaminated with toluene and is independent on the SWC. They suggested as Albergaria et al [1] that this result is related to the low organic matter content and high porosity of these types of soils, which are not able to significantly adsorb the contaminants. Amin et al [4] found the increase of toluene removal with the decrease of the SWC for sandy soil without the presence of organic matter.…”

Section: Introductionmentioning

confidence: 98%

“…On the other hand, Albergaria et al [1] and Soares et al [20] stated that the use of lower air flowrates will guarantee that the process occurs in equilibrium conditions and that slow diffusion effects are avoided, enhancing the remediation.…”

Section: Introductionmentioning

confidence: 99%

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Flowrate and water presence effect on venting/SVE process efficiency

Kacem

Esrael²,

Benadda³

2017

Int J Energy Environ Eng

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The objective of this paper is to study the effect of the soil water content ''SWC'' and flowrate on Venting and Soil Vapor Extraction ''SVE'' process efficiency. Two experiments simulating venting process and SVE process were done on sand column. Two sand water contents were tested: low SWC (7.6%) and a dry one, at low flowrate (600 mL min -1 ) and high flowrate (3200 mL min -1 ). Results show that the efficiency is better at low flowrate and dry sand whatever the process used (96.7%). It decreases with the water saturation and flowrate increases to reach 92.4%. The good efficiency, when low flowrate is applied, needs more time application (500 min) than when high flowrate is applied (300 min) for about 2.5% efficiency win. The presence of water and the low flowrate become more difficult than the contaminant extraction in the tailing part. It has been demonstrated the diffusional nature of this part and then the interest to introduce, in this step, other technics like the discontinued extraction, particularly for dry soil and high flowrate, where efficiency was improved by 1.3%. The utility of the optimal treatment time determination has been demonstrated to save the application time.

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Section: Resultssupporting

confidence: 88%

Section: Introductionmentioning

confidence: 98%

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Flowrate and water presence effect on venting/SVE process efficiency

Kacem

Esrael²,

Benadda³

2017

Int J Energy Environ Eng

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“…Various applications and inappropriate handling and disposal, results in detection of PCE in groundwater, surface water, wastewater, air and food [12-16]. PCE is considered as a probable carcinogenic chemical (Group 2A) to humans [9].…”

Section: Introductionmentioning

confidence: 99%

Modeling perchloroethylene degradation under ultrasonic irradiation and photochemical oxidation in aqueous solution

Kargar

Nabizadeh

Naddafi

et al. 2012

J Environ Health Sci Engineer

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Sonolysis and photochemical degradation of different compounds such as chlorinated aliphatic hydrocarbons are among the recent advanced oxidation processes. Perchloroethylene is one of these compounds that has been mainly used as a solvent and degreaser. In this work, elimination of perchloroethylene in aqueous solution by ultrasonic irradiation, andphotochemical oxidation by ultra violet ray and hydrogen peroxide were investigated. Three different initial concentrations of perchloroethylene at different pH values, detention periods, and concentrations of hydrogen peroxide were investigated. Head space gas chromatography with FID detector was used for analyses of perchloroethylene. This research was performed in 9 months from April through December 2011.Results showed that perchloroethylene could be effectively and rapidly degraded by ultrasonic irradiation, photochemical oxidation by ultra violet ray, hydrogen peroxide and a combination of these methods. Kinetics of perchloroethylene was strongly influenced by time, initial concentration and pH value. Degradation of Perchloroethylene increased with decrease in the initial concentration of perchloroethylene from 0.3 to 10 mg/L at all initial pH. The results showed an optimum degradation condition achieved at pH = 5 but did not affect significantly the perchloroethylene destruction in the various pH values. Kinetic modeling applied for the obtained results showed that the degradation of perchloroethylene by ultrasound and photo-oxidation followed first order and second order model. The percentage of removal in the hybrids reactor was higher than each of the reactors alone, the reason being the role of hydroxyl radical induced by ultrasound and photochemical reaction.

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“…Coastal areas are normally and basically constituted by sandy soils that present specific and well known characteristics. Albergaria et al [1] concluded that the adsorption capacity of sandy soils is extremely low and that the contaminants are mostly located in the gas phase of the soil, indicating that they have high mobility; this allows the horizontal and vertical spreading of contaminants, creating the possibility of risk for public health.…”

Section: Introductionmentioning

confidence: 99%

Remediation of coastal sandy soils polluted by petroleum leaks

Albergaria¹,

Delerue–Matos²,

Alvim-Ferraz³

2011

WIT Transactions on Ecology and the Environment

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The group of pollutants containing benzene, toluene, ethylbenzene and xylene (commonly known as BTEX) is typically related to petroleum leaks. According to the United States Environmental Protection Agency that group of pollutants is one of the most often found in contaminated soils. The remediation technology that is commonly applied to the remediation of soils contaminated with those pollutants is Soil Vapour Extraction (SVE); through the induction of vacuum to the soil matrix, SVE promotes the circulation of air within the soil, conducting the contaminant vapours removed to extraction wells and later to the atmosphere, after convenient treatment. The location of petroleum refineries strongly depends on the requirement of significant amounts of water for process, cooling and steam; besides of that, mainly due to the need of guarantying efficient supply of raw materials and shipping of products, petroleum refineries are usually located in coastal areas, commonly constituted by sandy soils; coastal sandy soils normally have low content of natural organic matter, but high soil water content (SWC) that has an important role on the distribution of the pollutants in the soil phases and, consequently, on the time and efficiency of remediation with SVE. The complete knowledge of that role is extremely necessary to adopt the most efficient strategy for the site remediation, aiming, namely, to preview the remediation time required to reach a defined remediation efficiency imposed by legislation. This work presents the study of the influence of SWC on the remediation of soils contaminated with benzene and xylene using SVE. The main objectives

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Estimation of pollutant partition in sandy soils with different water contents

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Cited by 15 publications

References 18 publications

Flowrate and water presence effect on venting/SVE process efficiency

Flowrate and water presence effect on venting/SVE process efficiency

Modeling perchloroethylene degradation under ultrasonic irradiation and photochemical oxidation in aqueous solution

Remediation of coastal sandy soils polluted by petroleum leaks

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