Application of the Physico-Chemical Desorption Technology for Soil Decontamination

Niemeyer, Bernd

doi:10.1007/978-3-662-04643-2_32

Cited by 2 publications

(1 citation statement)

References 5 publications

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“…For other processes, the soil has to be excavated and is then treated in column or tube reactors (3)(4)(5). Generally steam stripping techniques have been developed successfully (6). A general obstacle of decontamination processes is the cleanup of fine-grained soils, which are often disposed as special refuse at present.…”

Section: Introductionmentioning

confidence: 99%

Decontamination of Polyaromatic Hydrocarbons from Soil by Steam Stripping: Mathematical Modeling of the Mass Transfer and Energy Requirement

Braass¹,

Tiffert²,

Höhne³

et al. 2003

Environ. Sci. Technol.

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For cleaning of contaminated soil from polyaromatic hydrocarbons (PAH), a thermal separation process is applied. The process uses superheated steam that is supplied through a nozzle together with a suspension (approximately 40% soil content) of the contaminated soil into a tube reactor. In the reactor, the soil suspension is vaporized, and the PAH are stripped from the soil at temperatures of 140-300 degrees C. In a cyclone, a solid-vapor separation is carried out, and after going through a condenser, a separation of the condensed water and the PAH is obtained. For improvement of the economical performance, a heat recovery is integrated. This is realized by preheating the water/stream supplied to the evaporator by cooling the vapor steam leaving the reactor. For the mathematical description of the process, the removal of the PAH from the soil is considered to take place by a desorption process. Sorption isotherms are measured by batch experiments and can be described by isotherms of Langmuir type. A dispersion model is used to describe the mass transfer of the process. The process is mathematically modeled for instationary and stationary operation. The simulation predicts the lowest energy consumption at a good cleaning performance at a steam-to-suspension ratio of 5.

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Section: Introductionmentioning

confidence: 99%

Decontamination of Polyaromatic Hydrocarbons from Soil by Steam Stripping: Mathematical Modeling of the Mass Transfer and Energy Requirement

Braass¹,

Tiffert²,

Höhne³

et al. 2003

Environ. Sci. Technol.

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Modeling of PAH Elimination by Adiabatic Steam Stripping and Intraparticle Desorption

Frishfelds

Niemeyer

Hoehne

et al. 2003

Engineering in Life Sciences

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The decontamination process of solids loaded with PAH in a pilot plant is modeled. This process is separated into two main stages: fast steam stripping at the entrance of the separation tube and the subsequent slow desorption of PAH from the interior of the soil particles. The stripping process also occurs in two stages: fast diffusion controlled saturation of the partial pressures followed by the heat transfer controlled evaporation. The phase diagram of PAH/water is constructed using both the microscopic model and empirical relationships for systems with wide miscibility gaps. The numerical basis for the calculations describing desorption from the soil particles is discussed. The model for multiple PAH components is based on Langmuir type isotherms which include surface diffusion terms. The obtained results are contrasted with analytical data for systems displaying linear isotherms by dispersive approximation.

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Application of the Physico-Chemical Desorption Technology for Soil Decontamination

Cited by 2 publications

References 5 publications

Decontamination of Polyaromatic Hydrocarbons from Soil by Steam Stripping: Mathematical Modeling of the Mass Transfer and Energy Requirement

Decontamination of Polyaromatic Hydrocarbons from Soil by Steam Stripping: Mathematical Modeling of the Mass Transfer and Energy Requirement

Modeling of PAH Elimination by Adiabatic Steam Stripping and Intraparticle Desorption

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