Degradação de resíduos e alterações na resistividade elétrica, pH e Eh

Moreira, César Augusto; Braga, Antonio Celso de Oliveira; Fries, Maximilian

doi:10.1590/s0102-261x2009000200010

Cited by 8 publications

(10 citation statements)

References 3 publications

(3 reference statements)

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“…The resistivity values between 1 and 40 Ωm might be related to high salinity in acid mine drainage flows, caused by sulfides oxidation and acidification and dissolution of metals within the rock mass. The increase in salinity in aquifers due to contribution of pollutants is characterized by expressive decrease in the resistivity values when compared to natural streams [60][61][62][63].…”

Section: Resultsmentioning

confidence: 99%

Structural analysis and geophysical survey for hydrogeological diagnosis in uranium mine, Poços de Caldas (Brazil)

et al. 2019

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The implementation of open pit mines promotes alterations on geological and hydrogeological processes, mainly on natural streamflow patterns. Drainage system tries to reach its equilibrium due to modification on slope profiling water flows through new pathways contributing to erosion and leaching processes. One of the impacts related to mining is the generation of acid mine drainage (AMD), which occurs as a product of sulfide minerals exposure to oxidizing environment and, in contact to water, favors the formation of sulfuric acid. Thus, a low pH promotes a higher mobility of heavy metals and radionuclides, which become a source of contamination. In order to understand the hydrogeological dynamic in rock masses that contribute to AMD production, this paper aimed to subsidize mitigation programs in fractured aquifers using a structural analysis and geophysical survey for the reduction of acid drainage generation. The study was carried at the four mining fronts that compose the mine pit of Osamu Utsumi Mine, named according to its cardinal position (NE, SE, SW and NW). Local structural survey indicated that fractures attitudes are mainly N20E/80NW and N55 W/75NE, with intersections between them. Evidence of water flows, like whitish kaolinite stains and small vegetation growth, was identified in fronts NE, SW and NW, in addition to water springs at the base of the slopes. The flows arise mainly in areas that coincide to intersection between fracture systems in an orthogonal arrangement and the fracturing pattern indicated that at all fronts most of the fracture planes project into the open pit area, which favor the water channeling to the center of the mine as a water catchment basin. Moreover, the relationship between the persistence and spacing among the discontinuities enables a good hydraulic conductivity within the rock masses and the water upwelling on the slopes surface. The geophysical data corroborated with the structural survey, which identified the fracture planes as linear structures associated with low resistivity zones. DC resistivity method showed a strong contrast between saturated zones, differing natural from acidic water. Delimitation of linear features in the inversion models indicated that water flows are channeled through fracture planes and promote an expressive weathering process inside the rock masses, observed at depths of up to 70 m.

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Section: Resultsmentioning

confidence: 99%

Structural analysis and geophysical survey for hydrogeological diagnosis in uranium mine, Poços de Caldas (Brazil)

et al. 2019

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“…Os resultados revelam baixos valores de resistividade elétrica no intervalo de presença de resíduos, corroborados em trabalho anterior (Moreira e Braga, 2009b;Moreira et al, 2009, Bortolin e Malagutti Filho, 2010Santos et al, 2009). O intervalo atribuído à rocha é caracterizado por altos valores de resistividade, devido ao caráter inalterado.…”

Section: Conclusãounclassified

“…No aterro municipal de Cordeirópolis (SP), Moreira et al (2009) O trabalho de Moreira e Braga (2009a) apresenta os resultados de aplicação dos métodos de eletrorresistividade e polarização induzida em uma área industrial contaminada por benzeno, tolueno, xileno, 1,2 dicloroetano e sais inorgânicos. São discutidas as alterações físicas do meio contaminado a partir dos resultados obtidos e na perspectiva dos processos de biodegradação de compostos de fase líquida não aquosa (NAPL), além dos indícios de mineralização na porção central e adjacências da área contaminada.…”

Section: Introductionunclassified

Estudo geofísico em aterro controlado disposto sobre rochas fraturadas

Moreira¹,

Oliveira²,

Silva³

2011

Ambi-Agua

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“…As seções corroboram este fato, pois há um aumento da espessura da faixa de baixos valores de resistividade também de oeste para leste. Os resultados revelam baixos valores no intervalo de presença de resíduos, corroborados em trabalhos anteriores (MOREIRA et. al., 2009;MOURA & MALAGUTTI, 2003).…”

Section: Conclusõesunclassified