The innovative technology of combined chemical and phytostabilization is planned to be applied to the diffusely polluted area in Gyöngyösoroszi (Hungary), which is heavily polluted with toxic metals, such as Zn, Pb, Cd, Cu and As, due to former mining. To select the most suitable chemical stabilizer and plant combination for the soil and mining waste materials, field experiments using fly-ash and its combination with lime were performed in Gyöngyösoroszi. A grass mixture and two Sorghum species were tested. The stabilization of metals was monitored by covering the main transport routes, such as leaching by drainage water, plant uptake and erosion. An integrated methodology was applied, and the results of chemical analysis and toxicity testing were evaluated together. Regular soil, leachate and plant sampling and analysis were carried out during one season. The field experiments proved the efficiency of a fly-ash and lime combination together with the vegetation in controlling leaching, erosion and plant uptake. The amount of toxic metals in the collected drainage water decreased by 85-99% similarly to the water-extractable amount in the soil. The toxicity of both water and soil decreased due to the treatment, and healthy vegetation was established on the treated sites.
- Combined chemical and phytostabilization
- Toxic metals
ASJC Scopus subject areas
- Water Science and Technology
- Geotechnical Engineering and Engineering Geology
- Environmental Science(all)