Removal of PAHs from contaminated calyey soil by means of electro-osmosis (2011)

Titel Removal of PAHs from contaminated calyey soil by means of electro-osmosis
Gepubliceerd in Separation and Purification Technology, Vol. 79, No. 2, p.221-. ISSN 1383-5866.
Auteur Lima, A.T.; Kleingeld, P.J.; Heister, K.; Loch, J.P.G.
Datum 2011
Trefwoord(en) Polycyclic aromatic hydrocarbons, Remediation, Industrial contamination, Redox effects, Surfactant, Reference electrodes
Taal Engels
Type Artikel
Uitgever Elsevier
Samenvatting The removal of polycyclic aromatic hydrocarbons (PAHs) from clayey soils is an intricate task. The low porosity of compacted clayey soil hinders bacterial activity and makes convective removal by hydraulic flow impossible. Electro-osmosis is a process that has been used for the mobilization and cleanup of contaminants in clayey soils with varying successes. The present study focuses on the remediation of a contaminated peaty clay soil, located in Olst – the Netherlands, by means of electro-osmosis. The soil was originally contaminated by an asphalt production plant, active from 1903 to 1983, and presents high levels of all 16 priority PAHs indicated by the US Environmental Protection Agency (EPA). Such a long contact times of PAH with the soil (≥100 years) presents a unique study material with well established solid/liquid contaminant partitioning equilibrium, preferable to artificially spiked soil. A batch of 6 electro-osmosis laboratory experiments was carried out to study the removal of 16 PAHs through electro-osmosis. In these experiments, water and a surfactant (Tween 80) were used to enhance the PAH desorption. The electro-osmotic conductivities ranged from 2.88 × 10−10 to a substantial 1.19 × 10−7 m2 V−1 s−1 when applying a current density of 0.005–0.127 A m−2. Electro-osmosis was expected to occur towards the cathode, because of natural soil characteristics (negative zeta potential), but presented scattered directions. The use of reference electrodes proved to be very effective to the prediction of the flow direction. Finally, the addition of Tween 80 as a surfactant enhanced PAH removal up to 30% of the total PAH content of the soil in 9 days.
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Persistent Identifier URN:NBN:NL:UI:10-1874-206640
Metadata XML
Repository Universiteit Utrecht

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