A review on the sustainability of thermal treatment for contaminated soils

Ding, Da; Song, Xin; Wei, Changlong; LaChance, John

doi:10.1016/j.envpol.2019.06.118

Cited by 120 publications

(37 citation statements)

References 117 publications

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“…Besides amendments, soil microbial activity and C mineralization in semi‐arid soils depends on soil moisture, especially for saline soils due to salt‐generated osmotic stress (Setia & Marschner, 2013), and in thermally desorbed soils due to the presence of hydrophobic compounds (Ding, Song, Wei, & LaChance, 2019). Moreover, in semi‐arid environments, soil microbial activity varies with fluctuations due to repeated drying–rewetting (DW) events.…”

Section: Introductionmentioning

confidence: 99%

Soil carbon dioxide efflux from amended saline and thermally desorbed oil‐contaminated subsoil

Kruger

Sigdel

Gasch

et al. 2020

Agrosystems Geosci & Env

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Soil carbon (C) dynamics are often challenged by soil properties like high salt concentration and low organic matter content. To examine options for improving the quality of degraded soils, two pairs of soils, (a) non-saline and (b) saline surface soils from an agricultural field, and (a) non-contaminated subsoil and (b) thermal desorption-treated subsoil from an oil-contaminated site were collected. For the laboratory incubation, these four soils were treated with three amendments, (a) composted beef manure, (b) spent lime from sugarbeet (Beta vulgaris L.) processing, and (c) commercial mulch (Proganics), and soil CO 2 efflux was measured for three consecutive drying-rewetting (DW) cycles. Base efflux and the rate of change in base efflux were calculated from the slope and intercept of a linear fit model of CO 2 efflux over time (h), respectively for each DW cycle. Soil, amendment, and DW had significant effect on base efflux and the rate of change in base efflux during DW. Proganics had the highest base efflux of 29.0 and 24.0 μg CO 2-C m −2 d −1 for saline and thermal desorption-treated soils, respectively, and significantly (P < .05) higher than other amendments. Spent lime and compost also significantly (P < .05) increased base efflux over the control. Base efflux had a strong association with permanganate oxidizable carbon (POXC) for all soils, and a strong association with inorganic N for only saline and non-saline soils. Amendments increased microbial metabolism and have the potential to improve soil health and crop production for soils with severe limitations.

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Section: Introductionmentioning

confidence: 99%

Soil carbon dioxide efflux from amended saline and thermally desorbed oil‐contaminated subsoil

Kruger

Sigdel

Gasch

et al. 2020

Agrosystems Geosci & Env

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“…Equations (10) and (11) present the output flue gas temperatures from the inner pipe (t fo1 ) and that from the outer pipe (t fo2 ) respectively. As clearly depicted in Figure 4c, t fo1 is actually the input flue gas temperature of the outer pipe (t fi2 ), which is expressed by Equation 12.…”

Section: Model Of Burnermentioning

confidence: 99%

“…This method uses fluid injection or heating elements to heat the contaminated site at sufficient temperature without excavation. As a result, most pollutants are separated from soil and collected by the aboveground off-gas treatment units for standardized discharge [10]. Compared with ex situ thermal desorption (ESTD), ISTD has advantages of suitability to various types of pollutants, a short remediation period, high efficiency and no secondary pollution [11][12][13].…”

Section: Introductionmentioning

confidence: 99%

“…TCH is an effective soil-remediation technology in which the processes of heating and vacuum extraction are carried out simultaneously, either with heater blankets for surface and near-surface soil pollution or with an array of vertical heating wells for deep soil pollution [10]. Generally, the heating wells operate at 800 • C to 900 • C, near which radiation and conductive heat transfer dominate.…”

Section: Introductionmentioning

confidence: 99%

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Planned Heating Control Strategy and Thermodynamic Modeling of a Natural Gas Thermal Desorption System for Contaminated Soil

Gao

et al. 2020

Energies

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This paper presents a planned heating control strategy applied for a natural gas thermal desorption system for polluted soil to achieve the dynamic adjustment of the heating time and energy consumption. A lumped-parameter model for the proposed system is established to examine effects of the natural gas mass flow rate and the excess air coefficient on the heating performance of the target soil. The control strategy is explored to accomplish the heating process as expected with constant temperature change rate or constant volumetric water content change rate at different phases by adapting the natural gas flow. The results demonstrate that the heating plan can be realized within the scheduled 36 days and the total natural gas consumption can be reduced by 24% (1487 kg) compared to that of the open-loop reference condition, which may be widely applied for other thermal remediation systems of the polluted soil.

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“…A remediação térmica in situ consiste na transferência de calor para a subsuperfície. Essa transferência pode ser feita através de diversos mecanismos, como a condução direta de calor (Thermal Conduction Heating -TCH), o aquecimento por resistência elétrica ou a injeção de vapores, que se apresentam como os três principais mecanismos associados à ISTR (USACE 2009;DING et al 2019). Além destes, a ISTR pode ser aplicada através do aquecimento elétrico para vitrificação (in situ Vitrification -ISV), do aquecimento por radiofrequência e da combustão lenta (Smoldering Combustion).…”

Section: Remediação Térmica In Situ (Istr Ou Istt)unclassified

Princípios e aplicações de processos térmicos para remediação de áreas contaminadas

Leite¹,

Shinzato²,

Freitas³

2020

Rev. Inst. Geol.

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Processos térmicos têm sido cada vez mais aplicados mundialmente para a remediação de áreas contaminadas. O tratamento térmico, in situ ou ex situ, baseia-se na elevação da temperatura do solo e da água subterrânea visando a degradação do contaminante ou a sua transferência para a fase vapor, facilitando sua extração. Existem diversas formas de aquecimento, sendo a condução de calor, o aquecimento por resistência elétrica e a injeção de vapor os métodos mais utilizados. A remediação térmica pode ser utilizada em áreas com concentrações elevadas de contaminantes dissolvidos e até mesmo em fase separada (NAPLs), além de ser aplicável em diferentes litologias. Apesar do seu potencial de utilização, no Brasil essa técnica ainda é pouco estudada e aplicada. Dessa forma, o presente trabalho apresenta uma análise das diversas técnicas de remediação por processos térmicos, suas aplicações, vantagens e desvantagens, assim como um panorama de sua utilização em nível nacional.

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A review on the sustainability of thermal treatment for contaminated soils

Cited by 120 publications

References 117 publications

Soil carbon dioxide efflux from amended saline and thermally desorbed oil‐contaminated subsoil

Soil carbon dioxide efflux from amended saline and thermally desorbed oil‐contaminated subsoil

Planned Heating Control Strategy and Thermodynamic Modeling of a Natural Gas Thermal Desorption System for Contaminated Soil

Princípios e aplicações de processos térmicos para remediação de áreas contaminadas

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