Influence of water saturation and soil properties on the removal of organic pollutants using microwave heating

Davarzani, Hossein; Cochennec, Maxime; Djigo, Oumarou Ali; Ménard, Yannick; Colombano, Stéfan

doi:10.1016/j.jconhyd.2022.104095

Cited by 8 publications

(3 citation statements)

References 29 publications

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“…Pollutant migration pathways mainly include surface runoff, litter and soil leaching and infiltration, and groundwater diffusion migration [44,45]. The pattern of pollutant transport and transformation in the investigation area is closely related to the topography, hydrogeological conditions of the site [46], and the distribution of pollutants and pollution sources [47][48][49].…”

Section: Migration Analysis Of Contaminationmentioning

confidence: 99%

Identification and Assessment of Groundwater and Soil Contamination from an Informal Landfill Site

Liu

Wang

2022

Sustainability

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Landfills are a potential source of local environmental pollution of all kinds, and the gradual destruction of seepage-proof structures in informal landfills will lead to contamination of the surrounding soil and groundwater environment. In this study, an informal landfill site in eastern China is used as the research object. Using technologies such as unmanned vessels and monitoring well imaging to delineate the amount and distribution of polluting media, sampling of the surrounding soil, sediment, groundwater, and surface water for testing, analysis, and evaluation is carried out visually and finely for heavy metals, petroleum hydrocarbons, volatile organic compounds (VOCs), semi-volatile organic compounds (SVOCs), and other indicators. The test results show that volatile phenols are the main contaminant species in the shallow groundwater, chlorinated hydrocarbons and benzene were prevalent in the deep groundwater, hexachlorobenzene and lead in the surface soil, and di(2-Ethylhexyl) phthalate in the deep soil (5.5 m), with a maximum exceedance of 1.24 times. Nearly 10 years have passed since the waste dumping incident at the landfill, but characteristic contaminants are still detected in the topsoil of the dumping area, which shows the long-term nature of the environmental impact of illegal dumping on the site. The study recommends that when developing a comprehensive remediation plan, the persistence of the environmental impact of the waste should be considered and appropriate remediation measures should be screened.

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Section: Migration Analysis Of Contaminationmentioning

confidence: 99%

Identification and Assessment of Groundwater and Soil Contamination from an Informal Landfill Site

Liu

Wang

2022

Sustainability

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“…Davarzani et al [5] investigated the impact of three soil pore structures on microwave remediation. Soils with smaller particle sizes tend to have higher capillary pressure and lower inherent permeability, which, under the same conditions, hinder phase transitions and consequently extend the temperature plateau period.…”

Section: Introductionmentioning

confidence: 99%

Study on heat and mass transfer characteristics of porous media with different pore structures under continuous wave laser irradiation

Han,

Dong,

Jin

2024

Phys. Scr.

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The pore structure determined by porosity and particle diameter directly influences the mass and heat transfer capabilities within porous media. The effect of different pore structures on heat and moisture transfer within porous media under laser irradiation remains unclear. This paper addresses this issue by establishing a theoretical model of continuous wave (CW) laser irradiation on unsaturated porous media, and investigates the effects of four different pore structures on heat and mass transfer through experiments and simulations. The agreement between the experimental and simulated surface temperature rise curves in the study is relatively good, indicating that the model can reflect the temperature rise patterns of sand grains with different pore structures. Different pore structures have a minor impact on the temperature distribution of the solid phase and pressure distribution under CW laser irradiation. Over time, the Nusselt number decreases continuously under CW laser irradiation, but in terms of space, the relative magnitude relationship of Nusselt numbers among samples remains unchanged. Laser irradiation enhances the Darcy velocity, primarily influenced by both the Nusselt number and permeability. Although the internal pressure generated by water phase change can promote gas flow, it is not the primary influencing factor. Additionally, the evaporation rate is positively correlated with the Nusselt number, while Darcy velocity and gas-phase space size are also important influencing factors. Overall, this work provides results on the impact of pore structures on the internal heat and mass transfer processes within porous media under CW laser irradiation, thereby offering a theoretical basis for laser soil remediation technique or related studies on the interaction between laser and porous media.

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“…Compared with conventional thermal treatment, microwave-heating thermal remediation can significantly reduce operational costs and energy requirements . Microwave (MW) heat treatment technology has been proven to be economical and less time-consuming in the remediation of petroleum-contaminated soil due to its rapid, selective, and volumetric heating characteristics. , The “volumetric heating” process refers to heating from the interior to the surface simultaneously upon microwave irradiation, eliminating most of the thermal resistance in the object. It apparently differs from the conventional heating method, in which heat is transferred from the exterior surface to the interior area, and the amount is limited by the thermal gradient.…”

Section: Introductionmentioning

confidence: 99%

Microwave Heating Remediation of Light and Heavy Crude Oil-Contaminated Soil

Chen

Zhang

et al. 2023

Energy Fuels

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The remediation of petroleum hydrocarbon-polluted soil with microwave irradiation is a promising technology due to its high decontamination efficiency and low energy consumption. The current study is to experimentally investigate the performance of microwave heating remediation of light and heavy crude oil-contaminated soil in a lab-scale apparatus. The results show that 98.95 and 96.39% of total petroleum hydrocarbons (TPHs) in light and heavy crude oil-contaminated soil can be removed in 15 and 20 min at 1000 W, while the residual TPHs constitute around 143.2 and 401.4 mg/kg, respectively. This indicates that the removal of light crude oil from soil is much more efficient and consumes less energy due to the difference in removing behaviors for different fractions. The major removal of C10−C16, C16−C22, and C22−C40 fractions at 200, 300, and 400 °C reveals that the removal of both small and large molecular fractions is promoted by microwave irradiation as it occurs at a temperature far below their boiling points. Moreover, soil organic matter (SOM) in light and heavy crude oilcontaminated soil is maintained at a moderate level (i.e., 19 and 21.7 g/kg at 400 °C) after microwave treatment, giving an opportunity for soil reusability.

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Influence of water saturation and soil properties on the removal of organic pollutants using microwave heating

Cited by 8 publications

References 29 publications

Identification and Assessment of Groundwater and Soil Contamination from an Informal Landfill Site

Identification and Assessment of Groundwater and Soil Contamination from an Informal Landfill Site

Study on heat and mass transfer characteristics of porous media with different pore structures under continuous wave laser irradiation

Microwave Heating Remediation of Light and Heavy Crude Oil-Contaminated Soil

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