Evaluation of radionuclide contamination of soil, coal ash and zeolitic materials from Figueira Thermoelectric Power Plant
DOI:
https://doi.org/10.15392/bjrs.v7i2A.606Keywords:
soil, coal, coal ashAbstract
Neutron activation analysis and gamma-ray spectrometry was used to determine 238U, 226Ra, 228Ra, 210Pb, 232Th and 40K contents in feed pulverized coal, bottom ash, fly ash from cyclone and baghouse filters, zeolites synthesized from the ashes and two different soil samples. All the samples used in the study was collected at Figueira thermoelectric power plant, located in the city of Figueira, Paraná State, which coal presents a significant amount of uranium concentration. The natural radionuclide concentrations in pulverized coal were 4216 Bq kg–1 for 238U, 180 Bq kg–1 for 226Ra, 27 Bq kg–1 for 228Ra, 28 Bq kg–1 for 232Th and 192 Bq kg–1 for 40K.
The ashes fraction presented concentrations ranging from 683.5 to 1479 Bq kg–1 for 238U, from 484 to 1086 Bq kg–1 for 226Ra, from 291 to 1891 Bq kg–1 for 210Pb, from 67 to 111 Bq kg–1for 228Ra, from 80 to 87 Bq kg–1 for 232Th and from 489 to 718 Bq kg–1 for 40K. Similar ranges were observed for zeolites. The activity concentration of 238U was higher than worldwide average concentration for all samples. The concentration of the uranium series found in the ashes were lower than the values observed in similar studies carried out 10 years ago and under the limit adopted by the Brazilian guideline (CNEN-NN-4.01). Nevertheless, the concentrations of this specific area are higher than others coal mines and thermoelectric power plants in and out of Brazil, so it is advisable to evaluate the environmental impact of the installation.
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FLUES, M.; CAMARGO, I. M. C.; FIGUEIREDO FILHO, P. M.; SILVA, P. S. C.; MAZZILLI, B. P. Evaluation of radionuclides concentration in Brazilian coals. Fuel, v. 86, p. 807–812, 2007.
BECK, H. I. Radiation exposure due to fossil fuel combustion. Radiation Physics and Chemistry, v. 34, p. 285–93, 1989.
FUNGARO, D. A.; IZIDORO, J. C.; SANTOS, F. S.; WANG, S. Coal Fly Ash from Brazilian Power Plants: Chemical and Physical Properties and Leaching Characteristics. In: SARKER, P. K. Fly Ash: Chemical Composition, Sources and Potential Environmental Impacts. Hauppauge, N.Y.: Nova Science Publishers. Chapter 5, 2013, p. 145-164.
FLUES, M.; CAMARGO, I. M. C.; SILVA, P. S. C.; MAZZILLI, B. P. Radioactivity of coal and ashes from Figueira coal power plant in Brazil. Journal of Radioanalytical and Nuclear Chemistry, v. 270, p. 597–602, 2006.
IZIDORO, J. C.; FUNGARO, D. A.; SANTOS, F. S.; WANG, S. Characteristics of Brazilian coal fly ashes and their synthesized zeolites. Fuel Processing Technology, v. 97, p.38–44, 2012.
IZIDORO, J. C.; FUNGARO, D. A.; WANG, S. Zeolite synthesis from Brazilian coal fly ash for removal of Zn2+ and Cd2+ from water. Advanced Materials Research, v. 356-360, p. 1900- 1908, 2012.
FUNGARO, D. A. Synthesis of Value-added Materials from Coal Combustion Products and Biomass Ash. American Association for Science and Technology Communications, 2014. Available at <http://www.aascit.org>. Last accessed: 13 Nov. 2017.
IAEA - International Atomic Energy Agency. Practical aspects of operating a neutron analysis laboratory. IAEA –TECDOC- 564, Vienna: IAEA, 1999. 252p.
CUTSHALL, N. H.; LARSER, I. L.; OLSEN, C. R. Direct analysis of 210Pb in sediment samples: self-absorption corrections. Nuclear Instruments and methods, v. 206, p. 309-312, 1983.
UNSCEAR - United Nations Scientific Committee on the Effects of Atomic Radiation. Sources and effects of ionizing radiation. UNSCEAR Report 2000, Volume I- ANNEX B, 2010.
CNEN - Comissão Nacional de Energia Nuclear. CNEN-NN 4.01 - Requisitos de Segurança e Proteção Radiológica para Instalações Mínero-industriais, published in Diário Oficial da União (DOU), Jan. 2005.
COLES, D.G., RAGAINL, R.C., ONDOV, J.M., 1978. Behavior of natural radionuclides in Western coal-fired power plants. Environmental Science & Technology, v.12, p.442–446, 1978.
FLUES, M.; MORAES, V.; MAZZILLI, B. P. The influence of a coal-fired power plant operation on radionuclide concentrations in soil. Journal of Environmental Radioactivity, v. 63, p. 285–294, 2002.
GALHARDI J.A, GARCÍA-TENORIO R., BONOTTO DM, DÍAZ FRANCÉS I, Motta J. G. Natural radionuclides in plants, soils and sediments affected by U-rich coal mining activities in Brazil. Journal of Environmental Radioactivity, v.177 p. 37-47, 2017.
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