Abstract
Soil washing with chelating agents permanently removes toxic metals from contaminated soils by forming water-soluble complexes. EDTA-based method where chelant and process waters are recycled in a closed loop with no wastewater generated aims at sustainable remediation and reclamation of contaminated soils. For Pb-contaminated Meža Valley in Slovenia, geostatistical simulation showed that it has potential to reduce the area with Pb above critical regulatory threshold limit by 91 %. In small-scale laboratory trials, earthworms and simulated abiotic environmental factors changed the availability and mobility of metals still remaining in the washed soil after remediation. No such shifts were measured in remediated soil exposed to agricultural practice in field conditions. Remediation reduced toxic metal concentration in roots, green parts and fruits in most of the tested plants; uptake of Pb in edible parts was reduced below the concentration stipulated for foodstuffs by European Union legislature. However, the remediation process to some extent deteriorates soil properties and functioning as a plant and microbial substrate. In addition, micronutrients were removed from soil along toxic metals due to the non-selective nature of EDTA chelation. Revitalisation of remediated soil by providing missing structure, nutrients and microbial activity partly restored plant growth and soil functions.
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Lestan, D. (2015). Remediation of Toxic Metal-Contaminated Soil Using EDTA Soil Washing. In: Sherameti, I., Varma, A. (eds) Heavy Metal Contamination of Soils. Soil Biology, vol 44. Springer, Cham. https://doi.org/10.1007/978-3-319-14526-6_21
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