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<p>A novel approach to soil remediation has been developed in which soil washing and the addition of organic by-products are carried out simultaneously in a single step. This method was tested on soil contaminated with Cd, Pb and Zn. The soil was washed in batches (35&#xa0;kg soil/batch) with ethylenediaminetetraacetate (Na-, Ca-EDTA), sulfuric acid, and the reducing agent Na-dithionite, while organic by-products such as chicken manure, spent mushroom substrate, and corn cobs (2–5%) were mixed homogeneously into the soil. Results showed that this approach not only removed significant amounts of contaminants (58% Cd, 61% Pb and 12% Zn), but also improved soil properties, including increasing the amount of plant-available water, reducing leaching of residual toxic metals, reducing uptake of toxic metals in <i>Brassica juncea</i> and increasing β-glucosidase and dehydrogenase activity. The addition of organic by-products also prevented the accumulation of Na in the process after a series of batches and enabled the recycling (ReSoil® method) and continuous reuse of EDTA and the process solutions. However, the treatment also had a negative impact on plant growth, reducing the growth of <i>Brassica juncea</i> by 44%. Overall, this innovative approach is promising for effective and sustainable soil remediation, but further research is needed to optimize the process and minimize its impact on plant growth.</p>

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Simultaneous removal of toxic metals by washing and soil enrichment with organic by-products in a closed process

  • 期刊论文

  • 出版模式：

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  • 发表日期：

    2026年5月14日

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  • S. Gluhar,
  • A. Kaurin,
  • V. Zupanc,
  • A. Gantar,
  • B. Fojkar,
  • D. Lestan

摘要

A novel approach to soil remediation has been developed in which soil washing and the addition of organic by-products are carried out simultaneously in a single step. This method was tested on soil contaminated with Cd, Pb and Zn. The soil was washed in batches (35 kg soil/batch) with ethylenediaminetetraacetate (Na-, Ca-EDTA), sulfuric acid, and the reducing agent Na-dithionite, while organic by-products such as chicken manure, spent mushroom substrate, and corn cobs (2–5%) were mixed homogeneously into the soil. Results showed that this approach not only removed significant amounts of contaminants (58% Cd, 61% Pb and 12% Zn), but also improved soil properties, including increasing the amount of plant-available water, reducing leaching of residual toxic metals, reducing uptake of toxic metals in Brassica juncea and increasing β-glucosidase and dehydrogenase activity. The addition of organic by-products also prevented the accumulation of Na in the process after a series of batches and enabled the recycling (ReSoil® method) and continuous reuse of EDTA and the process solutions. However, the treatment also had a negative impact on plant growth, reducing the growth of Brassica juncea by 44%. Overall, this innovative approach is promising for effective and sustainable soil remediation, but further research is needed to optimize the process and minimize its impact on plant growth.