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Use of organic compost and peat in the retention of Pb, Zn and Cd and evaluation of the possible availability, toxicity and bioaccessibility of these metals after retention

Grant number: 17/16961-0
Support type:Scholarships in Brazil - Doctorate
Effective date (Start): November 01, 2017
Effective date (End): April 30, 2021
Field of knowledge:Engineering - Sanitary Engineering - Environmental Sanitation
Principal Investigator:Valéria Guimarães Silvestre Rodrigues
Grantee:Jacqueline Zanin Lima
Home Institution: Escola de Engenharia de São Carlos (EESC). Universidade de São Paulo (USP). São Carlos , SP, Brazil
Associated scholarship(s):19/00275-6 - Use of reactive materials in the potentially toxic metals sorption and bioacessibility and toxicity assessment after retention, BE.EP.DR

Abstract

Mining activities changes the natural geochemical cycle of potentially toxic metals, often culminating in environmental liabilities associated with the intense contamination by these metals. From this perspective, an alternative is the disposal of mining waste, which still contains considerable concentrations of the interest metals in an encapsulated form through the sealant and cover barriers systems. The organic reactive materials come with potential use in these barriers construction, as result of their recognized capacity to immobilize metallic cations, due to the high levels of humic substances. For this purpose, peat and organic composts can be studied, besides low economic cost and easy obtainment. Thus, this research will evaluate the viability of peat and organic composts use in the retention of metals present in Adrianópolis - Ribeira Valley (with Pb, Zn and Cd) mining wastes. For this, characterization tests (physical and chemical) and adsorption tests (batch and pilot scale tests) will be carried out in order to know the actual adsorptive capacity of these materials. However, it's important, in a multidisciplinary vision, the evaluation o future environmental impacts by these metals, directly associated to the retentive forces and to a possible remobilization. For this, availability, toxicity and bioaccessibility tests will be carried out with the samples used in the adsorption tests. In this way, will be evaluated, in physicochemical and biological terms, the whole cycle of the encapsulation system, from the building materials obtainment to the final contact with the biota and the environment, after the contaminating metals adsorption. (AU)