Environmental remediation of soils polluted mainly cadmium, zinc, and copper
Abstract
The method of remediation of soil technogenic polyelemental contaminated mainly Cd, Zn and Cu, where due to the use as a sorbent - ameliorants compounds of iron (II) and phosphate fertilizers in a certain ratio in accordance with the level of contamination of soils, increase in the efficiency of their environmental rehabilitation and recovery 's natural buffer properties, through influence on the processes of different hazard classes heavy metals migration and trophic regime in the soil, and of the plants productivity with higher rates of ecological safety. The technical result of the elaboration method is to accelerate the processes of heavy metals physical and chemical fixation by making joint structuring improver of inorganic type together with mineral substrates that are effectively reduce toxicity of pollutants, optimization and restoration of the environmental state of the soil-plant system, its resistance to pollution by heavy metals. The elaboration of the method involved the improvement of the known method, accelerated of the of physical-chemical fixation processes of heavy metals different hazard classes by application of soil improver of inorganic type compatible with the type of inorganic mineral substrates, which enables for effective impact on expanding the range of heavy metals different hazard classes unable to migration into adjacent soil environment and on their mobility, to provide optimization and restoration of the soil-plant system ecological state, its resistance to heavy metals pollution. Distinctive features and benefits of the proposed technical solution, compared with known techniques and approaches are the following: ensuring the effective reduction of the heavy metals toxicity of danger various classes with optimal conditions of physical and chemical adsorption mainly Cd, Zn and Cu by simultaneous restoration of natural soil properties (elemental composition, physical and chemical properties for the improvement of organic matter and soil trophic mode) and an allowance of the soil nutrients; resource costs reduce complexity and implementation procedures for environmental rehabilitation of contaminated soils at different levels of heavy metals pollution in areas of impact sustainable sources influence of technogenic emissions due to the accuracy of the determining the ratio of soil improvers inorganic type doses and fertilizers, effective impact of the proposed composition of the first year of application and prolongation of validity up to 5 years.
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