INRA USC1328, LBLGC EA1207, University of Orléans, Orléans, France.
Bull Environ Contam Toxicol. 2022 Mar;108(3):403-414. doi: 10.1007/s00128-021-03271-y. Epub 2021 May 26.
Soil pollution by metal(loid)s is an important issue in Europe, as it causes environmental and health problems. Therefore, remediation of these areas is needed. The success of phytoremediation process will depend on the ability of plants to implement, which can require the addition of amendments to the soil in order to improve soil conditions, immobilize pollutant and thus ameliorate plant growth. Amendments that can be used are biochar, activated carbon and redmuds, all of which have previously shown positive outcomes. The objectives of this study were to evaluate the effects of several amendments (biochars, activated carbons and redmuds) on (i) the soil physico-chemical properties of a former mine technosol contaminated by As and Pb, (ii) As and Pb immobilization and (iii) the growth of Trifolium repens. Results showed that amendment addition could ameliorate soil conditions, by reducing soil acidity (pH increased by 1.2 to 1.7 units) and immobilizing pollutants (85 to 99% of Pb immobilized); and improve plant growth (dry weight increased 1.5 to 2.5 times). However, not all amendments were beneficial to the soil and plant. For instance, the L27 activated carbon acidified soil pH, mobilized As and lowered plant growth. This study has allowed us to conclude that amendment effect is dependent on soil type, metal(loid)s and amendment properties, and it is thus necessary to choose the right amendment. Finally, amendments could be combined for better outcomes.
土壤中金属（类）污染物是欧洲面临的一个重要问题，因为它会引发环境和健康问题。因此，需要对这些地区进行修复。植物修复过程的成功与否将取决于植物的适应能力，而这可能需要向土壤中添加改良剂，以改善土壤条件、固定污染物，从而促进植物生长。可使用的改良剂有生物炭、活性炭和赤泥，它们以前都显示出了积极的效果。本研究的目的是评估几种改良剂（生物炭、活性炭和赤泥）对（i）受 As 和 Pb 污染的前矿山技术土壤的理化性质、（ii）As 和 Pb 的固定以及（iii）三叶草生长的影响。结果表明，改良剂的添加可以改善土壤条件，降低土壤酸度（pH 值提高了 1.2 到 1.7 个单位）并固定污染物（99%的 Pb 被固定）；并促进植物生长（干重增加了 1.5 到 2.5 倍）。然而，并非所有改良剂都有利于土壤和植物。例如，L27 活性炭使土壤酸化、使 As 活化并降低了植物的生长。本研究使我们得出结论，改良剂的效果取决于土壤类型、金属（类）和改良剂的特性，因此有必要选择合适的改良剂。最后，改良剂可以结合使用以获得更好的效果。
