VANESSA DO NASCIMENTO LINHARES
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Artigo IPEN-doc 28679 Enhanced removal of radium from radioactive oil sludge using microwave irradiation and non-ionic surfactant2022 - LINHARES, VANESSA do N.; ARAUJO, LEANDRO G. de; VICENTE, ROBERTO; MARUMO, JULIO T.Surfactant-based technologies have been studied for the treatment of radioactive waste containing isotopes of radium. Nevertheless, the use of combined processes to remove radium from radioactive oil sludge is scarce in the literature. The objective of this work was to investigate the potential of a non-ionic surfactant to remove radium from raw oil sludge (ROS) and pre-treated, microwave-irradiated oil sludge (POS). Characterization of ROS and POS was made using the following methods: Thermal Gravimetric Analysis, X-ray diffraction, Scanning Electron Microscopy coupled with Energy-Dispersive X-ray Spectroscopy, and gamma spectrometry. The effects of surfactant concentration (0.5–7.5%), temperature (25-60 °C), and contact time (30 and 60 min) were investigated. For ROS, little or no influence on the decontamination process was found for variations in the selected process parameters. For POS, the lowest surfactant concentration (2.5%) was the most efficient, removing about 94% of 226Ra and 228Ra. Neither contact time nor temperature affected removal. For ROS, removal percentages were 50–60% for 226Ra and 35–45% for 228Ra. The results indicated that the surfactant acted more efficiently in the decontamination of POS.Artigo IPEN-doc 26213 Treatment of TENORM waste using surfactant2019 - LINHARES, VANESSA do N.; VICENTE, ROBERTO; MARUMO, JULIO T.The petroleum industry is responsible by the generation of wastes that are both toxic and radioactive, sometimes called mixed waste. The toxicity is due to the presence of hydrocarbons and sulfur and the radioactivity is the result of the leaching of thorium and uranium daughters present in the oil-producing formation and their transport by the extracted fluids to the production rigs. Because of the presence of these radioactive materials of natural origin, this waste is named TENORM (Technologically Enhanced Naturally Occurring Radioactive Material). The main radionuclides present are 210Pb, 224Ra, 226Ra and 228Ra. In Brazil, the offshore platforms cannot dispose this waste by reinjection in wells because federal law prohibits disposal of radioactive waste in seawaters or seabed. The waste is, therefore transported to land and stored. This work aims at investigating a method of decontaminating the oil sludge by using surfactant that can increase the removal efficiency of the radionuclides. After a successful treatment, the decontaminated waste can be disposed of as non-radioactive industrial waste in a licensed facility and the concentrated radioactive material can be treated as radioactive waste, decreasing significantly the costs of management and improving safety.