Banca de QUALIFICAÇÃO: WATILLA PEREIRA COVRE
Uma banca de QUALIFICAÇÃO de DOUTORADO foi cadastrada pelo programa.DISCENTE : WATILLA PEREIRA COVRE
DATA : 21/02/2020
HORA: 08:30
LOCAL: Auditório PgAgro
TÍTULO:
BACTERIA AND ORGANIC FERTILIZATION AS CONDITIONS FOR NATURAL PLANT PHYTOMMEDIATION IN COPPER MINING WASTE
PALAVRAS-CHAVES:
Waste, Chemical attributes, Mineralogical composition, Heavy metal, Recovery, bioremediation, organic compounds
The region of the Carajás Mineral Province holds important mineral reserves such as IOCG (iron oxide-copper-gold) deposits. In this region are installed large projects for the extraction of copper ore (Cu) in the open, in addition to artisanal mining activities. However, mining produces a large amount of waste that can be dangerous due to its unfavorable physical and chemical characteristics, as well as a high concentration of heavy metals considered toxic elements to living organisms. It is essential to have a deeper knowledge of the characteristics of mining waste for better management of environmental risks and development of recovery strategies for areas influenced by activity in the region. Phytoremediation has been increasingly used to revegetate sites contaminated by heavy metals through the use of native plants. New technologies such as organic treatments and microorganisms are being tested to favor the establishment of these plants in adverse environments, such as mining waste. In this context, the objective of the work was to characterize and assess the risk of different residues from artisanal and industrial mining in Cu, in addition to determining recovery strategies, such as those applied in bioremediation. The study was carried out in two Cu mining areas in the municipality of Canaã dos Carajás (PA), where soil was collected, and the sterile artisanal waste (EA), artisanal tailings (RA) and industrial tailings (RI). The chemical and physical attributes of these materials were determined in the laboratory. The mineralogical composition of the samples was determined by X-ray diffraction. Heavy metals were extracted by aqua regia and determined by inductively coupled plasma mass spectrometry - ICP-MS. The geoaccumulation index (Igeo), the contamination factor (FC) and the potential ecological risk (REP) were calculated. In general, the residues showed high pH, an attribute that may have influenced the lower availability of elements. Mg and K were predominant in RA, while Na and P were present in greater quantities in RI. Low CO content, low CTC and more sandy texture were found in the IR. The residues also showed low concentrations of micronutrients. RA was distinguished by the presence of talc in its mineralogical composition. Cu was the element with the highest concentration in all residues, including the reference soil, but high concentrations of Cr, Ni and Co were also found, mainly in RA. Low concentrations of Cu were available in the IR, but available toxic concentrations of the metal were present in artisanal mining waste. In RA, the Igeo, FC and REP indices showed greater environmental risks for Cu and Cr.
PÁGINAS: 45
GRANDE ÁREA: Ciências Agrárias
ÁREA: Agronomia
SUBÁREA: Ciência do Solo
ESPECIALIDADE: Manejo e Conservação do Solo
RESUMO:
The region of the Carajás Mineral Province holds important mineral reserves such as IOCG (iron oxide-copper-gold) deposits. In this region are installed large projects for the extraction of copper ore (Cu) in the open, in addition to artisanal mining activities. However, mining produces a large amount of waste that can be dangerous due to its unfavorable physical and chemical characteristics, as well as a high concentration of heavy metals considered toxic elements to living organisms. It is essential to have a deeper knowledge of the characteristics of mining waste for better management of environmental risks and development of recovery strategies for areas influenced by activity in the region. Phytoremediation has been increasingly used to revegetate sites contaminated by heavy metals through the use of native plants. New technologies such as organic treatments and microorganisms are being tested to favor the establishment of these plants in adverse environments, such as mining waste. In this context, the objective of the work was to characterize and assess the risk of different residues from artisanal and industrial mining in Cu, in addition to determining recovery strategies, such as those applied in bioremediation. The study was carried out in two Cu mining areas in the municipality of Canaã dos Carajás (PA), where soil was collected, and the sterile artisanal waste (EA), artisanal tailings (RA) and industrial tailings (RI). The chemical and physical attributes of these materials were determined in the laboratory. The mineralogical composition of the samples was determined by X-ray diffraction. Heavy metals were extracted by aqua regia and determined by inductively coupled plasma mass spectrometry - ICP-MS. The geoaccumulation index (Igeo), the contamination factor (FC) and the potential ecological risk (REP) were calculated. In general, the residues showed high pH, an attribute that may have influenced the lower availability of elements. Mg and K were predominant in RA, while Na and P were present in greater quantities in RI. Low CO content, low CTC and more sandy texture were found in the IR. The residues also showed low concentrations of micronutrients. RA was distinguished by the presence of talc in its mineralogical composition. Cu was the element with the highest concentration in all residues, including the reference soil, but high concentrations of Cr, Ni and Co were also found, mainly in RA. Low concentrations of Cu were available in the IR, but available toxic concentrations of the metal were present in artisanal mining waste. In RA, the Igeo, FC and REP indices showed greater environmental risks for Cu and Cr.
MEMBROS DA BANCA:
Presidente - 6388356 - ANTONIO RODRIGUES FERNANDES
Interno - 030.493.086-56 - SILVIO JUNIO RAMOS - ITV
Externo à Instituição - RENATO ALVES TEIXEIRA - UNIFESSPA
Externo à Instituição - EDNA SANTOS DE SOUZA - UNIFESSPA