Physico-Chemical Treatment Methods for Soil Remediation

Assink, J. W.

doi:10.1007/978-94-009-2807-7_138

Cited by 6 publications

(3 citation statements)

References 2 publications

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“…Excavation of metal polluted soils to landfills is common practice in many European countries but the costs involved and the ever decreasing amount of acreage available for dumping has intensified the search for efficient, cost effective treatment methods for metal-polluted soils. Present technologies include chemical stabilization, physical separation and extraction techniques (Assink, 1988;Daley, 1989;Esposito et al, 1989). Conventional stabilization techniques involve pH increase and/or immobilization through addition of lime or alumo-silicates (DeBoodt, 1991;Powell and Mahalingan, 1992;Mench et al, 1994).…”

Section: Introductionmentioning

confidence: 99%

Feasibility of a counter-current extraction procedure for the removal of heavy metals from contaminated soils

Masscheleyn

Verloo

1996

Water Air Soil Pollut

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Section: Introductionmentioning

confidence: 99%

Feasibility of a counter-current extraction procedure for the removal of heavy metals from contaminated soils

Masscheleyn

Verloo

1996

Water Air Soil Pollut

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“…Here the length for the diffusion from the first AVE to the channel where advection is taking place is one-half of that between other adjacent AVEs, so the total mass balance is (18) …”

Section: Mass Balance In the Innermost Ave In The Cylindermentioning

confidence: 99%

“…All these considerations prove the importance of achieving a better understanding of these complicated processes, which are not only related with the fate of heavy metals in soil, but also to the design of possible technologies that may be used to remediate the contaminated sites, as for instance soil flushing/washing (14)(15)(16) and electrokinetic and related remediation techniques (17,18).…”

Section: Introductionmentioning

confidence: 99%

Soil Flushing with EDTA Solutions: A Model for Channeled Flow

García-Delgado¹,

Rodríguez‐Maroto²,

Gómez-Lahoz³

et al. 1998

Separation Science and Technology

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A l-D model for the flushing of metal contaminated soils with extracting aqueous solutions is presented. Previous experimental results of the flushing of carbonatic soil contaminated with lead with EDTA solutions showed the formation of channels of preferential flow as well as substantial rebounds in effluent lead concentration after periods of no pumping, indicating an important kinetic limitation for lead removal. This limitation is associated with the presence of a stagnant aqueous phase in addition to the mobile aqueous phase running through the channels. The model assumes an initial homogeneous distribution of lead in the soil, mainly present as small spheres of a solid carbonate which must dissolve. If the spheres are far from the channels, after solution the lead must diffuse through the stagnant aqueous phase until it reaches the channels and is washed out of the column. The model is able to simulate the rebound curves as well as the effluent concentration during the course of the operation. The importance of the way the channels arise is established by sensitivity studies performed for different mechanisms of the solution circulation and the formation of channels. More experimental results are needed to discriminate which of the alternatives studied is operative.

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