Remediation of Caldas site by natural attenuation
DOI:
https://doi.org/10.15392/bjrs.v7i2A.567Abstract
Acid mine drainage (AMD) is one of the main environmental issue caused by chemical and bacterial oxidation of pyrite (FeS2) and other sulfite minerals when exposed to atmospheric conditions during mining. In Brazil, AMD occurs in a former uranium mine and contains radionuclides and other elements, which are precipitated from acidic water by liming. Due to the inefficiency of the treatment, contaminants overflow to the water reservoir of Indústrias Nucleares do Brasil – INB in Caldas. The multiplicity of interactions that can occur between the contaminants and the sediments of the reservoir requires a broader approach in order to understand the fixation and/or transport of these elements. In this work the natural remediation approach is reviewed and an initial chemical and radiochemical characterization of the reservoir sediments is presented. Uranium was determined by spectrophotometry, Ra-226, Ra-228 and Pb-210 by gamma spectrometry and zinc by ICP-OES. Twenty-six sediment samples were collected in the reservoir and a bathymetry survey by sonar was performed to determine the thickness of the sediment layer. All the data were processed using the ArcGIS program. To assess the potential mobility and bioavailability of contaminants and to study the role of bacterial sulfate reduction in the immobilization of these contaminants, Acid-volatile sulfide (AVS) analyzes will be performed as a further step.
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JAMBOR, J. L.; BLOWES, D. W.; RITCHIE, A. I. M., Environmental Aspects of Mine Wastes - Chapters 9 and 10, v. 31. Vancouver: Mineralogical Association of Canada, 2003.
CAMPANER, V. P.; SILVA, W. L. Processos físico-químicos em drenagem ácida de mina em mineração de carvão no sul do Brasil. Química Nova, v. 32 (1), p. 146-152, 2009.
MELLO, J. W. V.; DUARTE, H. A.; LADEIRA, A. C. Q. Origem e Controle do Fenômeno Drenagem Ácida de Mina. Cadernos Temáticos de Química Nova na Escola - QNESC, v. 8, p. 24-29, 2014.
SOUZA, L. R.; KNOLLER, K.; LADEIRA, A. C. Q., Sulfur isotope fractionation and sequen-tial extraction to assess metal contamination on lake and river sediments. J Soils Sediments, v. 16 (7), p. 1986-1994, 2016.
KNOLLER, K.; FAUVILLE, A.; MAYER, B.; STRAUCH, G.; FRIESE, K.; VEIZER, J. Sulfur cycling in an acid mining lake and its vicinity in Lusatia, Germany. Chemical Geology, v. 204, p. 303 – 323, 2004.
US EPA - United States Environmental Protection Agency. Contaminated Sediment Remedi-ation: Guidance for Hazardous Waste Sites – EPA-540-R-05-012, Washington: DC, 2005. 236p.
KNOLLER, K.; JESCHKE, C.; SIMON, A.; GAST, M.; HOTH, N. Stable isotope fractionation related to technically enhanced bacterial sulphate degradation in lignite mining sediments. Isotopes in Environmental and Health Studies, v. 48 (1), p.76 – 88, 2012.
US EPA - United States Environmental Protection Agency. Draft Analytical Method for De-termination of Acid Volatile Sulfide and Selected Simultaneously Extractable Metals in Sediment, EPA 821-R-91-100, Washington: DC, 1991. 22p.
DI TORO, D.M.; MAHONY, J.D.; HANSEN, D. J.; SCOTT, K. J.; CARLSON, A.R.; AN-KLEY, G. T. Acid volatile sulfide predicts the acute toxicity of cadmium and nickel in sedi-ments. Environmental Science and Technology, v. 26(1), p. 96–101, 1992.
US EPA - United States Environmental Protection Agency. Procedures for the Derivation of Equilibrium Partitioning Sediment Benchmarks (ESBs) for the Protection of Benthic Or-ganisms: Metal Mixtures (Cadmium, Copper, Lead, Nickel, Silver and Zinc) - EPA 600-R-02-011, Washington: DC, 2005. 175p.
SOUZA, L. R.; KNOLLER, K.; LADEIRA, A. C. Q. Investigation into River Sediments Tox-icity as a Result of Inappropriate Waste Disposal. Journal of Waste Management, v. 2013, 7 pages, 2013.
MMA - Ministério do Meio Ambiente. Resolução Nº 454, de 01 de novembro de 2012. Avail-able at: <http://www.mma.gov.br/port/conama/legiabre.cfm?codlegi=693> Last accessed: 05 Jun. 2017.
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