Reducing the Risk of Toxic Elements Spreading from Sulphide-Containing Clinkers by Biorecultivation

Abstract

Book DOI: 10.21467/abstracts.93 of summer the grass was cut, from each division separately, weighed and analyzed. As a result, quantitative estimates were obtained on the intensity of plant growth on a substrate of different composition and recommendations were made on the optimal scheme of neutralization of spent clinker and recultivation of the territory. Figure 1. Seedlings 1.5 months after sowing: A experimental bed; B background bed. According to the results of the analysis of ISP-MS in the composition of water extracts from the material of beds, the metal concentrations did not exceed the clark values for the hydrosphere. The exception was copper (excess over clark on different lines by 6 30 times) and metalloids: As (by 6 20 times), Sb (by 2 20 times), Se (by 6 70 times). The pH and the conductivity of the aqueous extracts from 1 to 4 of the site increases because the neutralized alkaline clinker (pH about 12, Fig.2), but when mixed with soils, neutral values are achieved (site 1.2 and 1.3). The difference in plant growth on four sites was visible and confirmed after measurement and weighing of cut grass. The average height of sprouts decreases along the bed from 10 to 6 cm, on the background section the grass height was 12 cm (Fig. 2). Figure 2.A рН and electrical conductivity (EC) of water extracts from bed substance, clinker and soil. B Height and weight of beveled grass. During the experiments, the optimal clinker/soil ratio was selected for planning the territory with salted traumas not more than 2/3, with the ratio of 1/1 plants markedly suppressed and their growth suppressed. This is due to the aggressive environment: the addition of lime leads to an increase in pH values to the level of the strongly alkaline environment, which has a main impact on the germination and further growth of herbs. Above-ground parts of plants do not accumulate dangerous concentrations of elements, therefore this trauma mixture can be effectively used for recultivation works. Funding. This research was funded by the Russian Science Foyndation, grant number 19-17-00134.