Remediation of saturated soil contaminated with petroleum products using air sparging with thermal enhancement

Mohamed, A.M.I.; El-menshawy, Nabil; Saif, Amany M.

doi:10.1016/j.jenvman.2006.04.005

Cited by 29 publications

(5 citation statements)

References 14 publications

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“…The extraction pressure (related to airflow rates) and extraction mode are two important parameters for the treatment conditions of a T-SVE system [1,11,14,17]. This section describes the effects of extraction conditions on the removal rate of contaminants.…”

Section: Influence Of Extraction Conditions On T-svementioning

confidence: 99%

Influence of extraction and injection conditions on the performance of thermal-enhanced soil vapor extraction

Yang,

Feng,

Zheng

2024

IOP Conf. Ser.: Earth Environ. Sci.

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Thermal-enhanced soil vapor extraction (T-SVE) is an in-situ remedial technique that can address the limitations of contaminant mass transfer and soil permeability. The relative humidity of the injected air, heating temperature of the thermal well, extraction pressure, and extraction mode are important design parameters of a T-SVE system that determine the temporal and spatial distributions of soil temperature and removal rate. Using a thermal–hydraulic–chemical coupled model with the interphase mass transfer of contaminants and water evaporation/condensation, this study investigated the effects of relative humidity, heating temperature, extraction pressure, and extraction mode on T-SVE performance. The results showed that with an increase in relative humidity, the heating temperature of the contaminated soil significantly improved; however, the removal rate of contaminants decreased, particularly in the late stage of remediation. Considering the heating temperature of the thermal well, a critical air relative humidity value that significantly affects the removal rate of contaminants was observed. The heating temperature of the thermal well must be considered in engineering design; however, the evaluation of the relative humidity of the air cannot be ignored.

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Section: Influence Of Extraction Conditions On T-svementioning

confidence: 99%

Influence of extraction and injection conditions on the performance of thermal-enhanced soil vapor extraction

Yang,

Feng,

Zheng

2024

IOP Conf. Ser.: Earth Environ. Sci.

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“…Qi et al showed that benzene was likely residual at the water-NAPL interface in fine-to-medium sand aquifers [23]. Mohamed et al concluded that long-term mass removal for a glop of NAPL located close to an air channel was dependent on the aqueous diffusion of the dissolved phase towards the air-water interface, which, in turn, increases with the increase in the mean particle size of the contaminated soil [24]. Petri et al conducted an experiment to show that the morphology of vadose-zone NAPL strongly controls mass transfer, with occluded NAPL sources emitting considerably lower mass flux than exposed NAPL sources [25].…”

Section: Introductionmentioning

confidence: 99%

Changing Soil Water Content: Main Trigger of the Multi-Phase Mobilization and Transformation of Petroleum Pollution Components—Insights from the Batch Experiments

Yang,

Wang,

Xia

et al. 2024

Water

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Soil moisture content continuously alters the types and forms of petroleum organic pollutants in the soil through processes such as dissolution, convection, and dilution, forming complex migration and transformation in a water–air–soil–NAPL system. Field investigations and traditional indoor simulation experiments have difficulty in terms of accurately diagnosing the state of different petroleum pollutants due to the influence of environmental factors and the difficulty of controlling single factors. Batch experiments were conducted to simulate the mobilization and differentiation processes of petroleum pollutants under the influence of soil water content. The results show that (1) the residual content of components is the lowest in coarse sand and the highest in clay, which is mainly affected by soil particles; meanwhile, the residual saturation value of octanoic acid is the largest, and that of toluene is the smallest, as determined in terms of their viscosity and volatility. (2) The infiltration processes of the components are affected by their properties and medium characteristics. Due to its small particle size and strong adsorption, clay has the highest residual saturation of petroleum pollutants (28.8%). This can even be more than twice that of coarse sand (13.3%). For different components, the residual saturations of octanoic acid and toluene are the highest and lowest, respectively (taking fine sand as an example: 25.3% and 13.2%), with a relatively large difference, as determined in terms of viscosity and solubility. (3) As the free phase can migrate freely, it is transformed most rapidly in the pores. The changes in the dissolved phase of each component are relatively small and tend to be gentle. The changes in the residual phase are mainly affected by volatility, viscosity, soil particles, and pore and cosmid content; the degree of change is ordered as follows: toluene > cyclohexane > hexadecane > octanoic acid.

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“…Transition metal III complexes have thermal stability, high emission efficiency, and broad capacity for adjusting optical characteristics through ligand modifications [15][16][17][18]. These characteristics make them promising for use in organic light-emitting diodes (OLEDs) [19,20], particularly red [21], green [22], and blue [23] OLEDs, light-emitting electrochemical cells [24], bio-imaging probes, chemo-sensors [25,26], and optoelectronic elements for future molecular computers [27].…”

Section: Introductionmentioning

confidence: 99%

Gamma radiation induced variation in structure formation and optical characteristics of evaporated tris [2-phenylpyridinato-C₂,N]iridium(III) films prepared by electron beam evaporator in photovoltaic applications

Elesh

El-Damhogi²,

Mohammed³

2023

Phys. Scr.

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This study fabricates novel tris (2-phenylpyridinato-C2, N] iridium III thin films using an electron beam evaporator and investigates their structure formation, surface morphology, and linear/nonlinear optical properties. The structural features of thin films were examined using Fourier Transform spectroscopy (FTIR), X-ray diffraction (XRD), Scanning Electron Microscope (SEM). The optical characteristics for various doses of gamma radiation (3 kGy, 6 kGy and 9kGy) were investigated using a UV-Vis-NIR spectrophotometer in the wavelength range from 200 nm to 2500 nm. In addition, the values of fundamental energy gap (Efundamental) values showed a reduction from 2.30 to 1.92 eV and urbach energy increasing from 0.23 to 0.30 when the deposited film irradiated for 9 kGy. The third-order nonlinear susceptibility ( ), the nonlinear absorption coefficient ( ) and the nonlinear refractive index ( ) were determined for all gamma doses. Furthermore, The optical electronegativity ( ), the first moment ( ), the second moments of optical spectra ( ), the oscillator strength (f), the dispersion energy ( ), infinite dielectric constant ( ),oscillator energy ( ), the lattice dielectric constant ( ), and to the effective mass for as-deposited film are calculated as : 1.860, 17.29, 300.20, 0.9960 (eV)2, 4.15 eV, 4.52, 1.18 eV, 5.58, and 8.86 x1059 kg−1 m−3 respectively. The high values of ( ) for as-deposited and irradiated are essential for the creation of low power devices for nonlinear optical applications involving ultrafast switches, optical computers, and ultra-pulsed lasers.

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Remediation of saturated soil contaminated with petroleum products using air sparging with thermal enhancement

Cited by 29 publications

References 14 publications

Influence of extraction and injection conditions on the performance of thermal-enhanced soil vapor extraction

Influence of extraction and injection conditions on the performance of thermal-enhanced soil vapor extraction

Changing Soil Water Content: Main Trigger of the Multi-Phase Mobilization and Transformation of Petroleum Pollution Components—Insights from the Batch Experiments

Gamma radiation induced variation in structure formation and optical characteristics of evaporated tris [2-phenylpyridinato-C₂,N]iridium(III) films prepared by electron beam evaporator in photovoltaic applications

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Remediation of saturated soil contaminated with petroleum products using air sparging with thermal enhancement

Cited by 29 publications

References 14 publications

Influence of extraction and injection conditions on the performance of thermal-enhanced soil vapor extraction

Influence of extraction and injection conditions on the performance of thermal-enhanced soil vapor extraction

Changing Soil Water Content: Main Trigger of the Multi-Phase Mobilization and Transformation of Petroleum Pollution Components—Insights from the Batch Experiments

Gamma radiation induced variation in structure formation and optical characteristics of evaporated tris [2-phenylpyridinato-C2,N]iridium(III) films prepared by electron beam evaporator in photovoltaic applications

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Product

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Gamma radiation induced variation in structure formation and optical characteristics of evaporated tris [2-phenylpyridinato-C₂,N]iridium(III) films prepared by electron beam evaporator in photovoltaic applications