NATHALIA FONSECA BOIANI

NATHALIA FONSECA BOIANI

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Avaliação da toxicidade de surfactantes não iônico e aniônico submetidos a tratamento por feixe de elétrons
2021 - GARCIA, VANESSA S.G.; TOMINAGA, FLAVIO K.; BOIANI, NATHALIA F.; SILVA, THALITA T.; ROSA, JORGE M.; BORRELY, SUELI I.
Toxicity of textile effluents treated by electron beam technology
2019 - GARCIA, VANESSA S.G.; BOIANI, NATHALIA F.; ROSA, JORGE M; BORRELY, SUELI I.
The textile industry uses expressive amount of water during the production and generate effluents that contain residuals of dyes, surfactants, peroxides, acids and salts, and toxicity. In addition, the textile effluents are commonly colored, because the dyes used in fibers dyeing usually have low fixation and high solubility. Many of the mentioned products are not easily removed, requiring additional treatment steps. Advanced Oxidative Processes, such as electron beam irradiantion (EBI), can be a good alternative to reduction of organic pollutants from effluents. Therefore, studies on these contaminants in aquatic environment are important for assessing their impacts on ecosystems and water quality. The objective of this study was to evaluate the toxicity of textile effluents treated with EBI. The doses of 2.5 kGy and 5.0 kGy were used. The toxicity assays were performed with Daphnia similis organisms, exposed to samples during 48 hours, and the results expressed by EC50 (median effective concentration). For the textile effluent, EC 50% values ranged from: 2.95 ±0.13 (raw effluent) until 20.90 ±1.48 (irradiated effluent, at 5kGy). The EBI treatment was effective for toxicity reduction, with efficiency higher than 60% (2.5 kGy) and 80% (5.0 kGy). The study of organic and inorganic contaminants, presents in these effluents, demonstred EC 50 values below 5%. These results demonstrate high toxicity of contaminants from textile effluents for aquatic organisms (D. similis, cladocera). Similar data was observed for the raw effluent. These values are relevant for thinking radiation as a possible technology for such a type of effluent.
Toxicity and environmental impacts approached in the dyeing of polyamide, polyester and cotton knits
2019 - ROSA, JORGE M.; GARCIA, VANESSA S.G.; BOIANI, NATHALIA F.; MELO, CAMILA G.; PEREIRA, MARIA C.C.; BORRELY, SUELI I.
Three colouration process was analyzed, in which consumption of water, the spent of electrical and thermal energy, emission of carbon dioxide besides effluent toxicity of dyeing of polyamide, cotton and polyester knits were approached. the dyeing of polyamide knit presented lowest consumption of electrical energy, the dyeing of polyester knit presented the lowest consumption of thermal energy and emission of co2 molecules into atmosphere, and the effluent of cotton dyeing presented lowest acute toxicity (CE50) to Daphnia similis.
Electron beam irradiation of textile effluents and non-ionic ethoxylated surfactant for toxicity and color removal
2019 - BORRELY, S.I.; SILVA, L.G.A.; DEL SOLE, S.V.; GARCIA, V.S.G.; BOIANI, N.F.; ROSA, J.M.
Textile industry has an expressive scenario in the world economy and Brazil is the 5th in the textile production. By 2015, Brazilian textile production represented US $ 39.3 billion, accounting for more than 1.8 million tons of fabric. The effluents from textile industry are highlighted by quantity of wastewater discharged and variety of substances (dyes, bleaching agents, surfactants, salts, acids, among others). Such compounds often prove to be toxic to aquatic biota. This present study aims to assess toxicity of whole effluents, before and after irradiation (by electron beam accelerator, EBI). In addition, the reduction of the effluent color after irradiation is also very important. Daphnia similis and Vibrio fischeri were the biological systems applied for toxicity evaluations. Previous results demonstrated the surfactant as the main toxic compound, in the untreated and irradiated forms, EC 50 = 0.44 ppm ± 0.02 (untreated); EC 50 = 0.46 % ± 0.07 (irradiated). The irradiation was effective for reducing color of the effluent, starting from 0.5 kGy. EB irradiation may be proposed as an alternative treatment for the final effluent from textile processing, mainly for reuse purposes.
Emerging pollutants, related toxicity, and water quality decreasing
2018 - BORRELY, S.I.; ROSA, J.M.; BOIANI, N.F.; GARCIA, V.S.G.; SOUSA, A.L.
The quality of drinking water is decreasing in distinct parts of the globe. Among the major sources of aquatic environmental pollution we have tannery wastewaters (TW). Pharmaceuticals into waters are reported as emerging pollutants and both of them are also related to surfactants and dyes usage during the manufacture. TW was the worst in terms of toxicity and organic matter, referred as chemical oxygen demand, when compared to surfactants, textile and pharmaceuticals considered in the present study. From the five surfactants alkylene oxide was relatively more toxic than the others to dafnids. The intention of the selected results, figures and discussion was to highlight so wide types and ways for water contamination as well as to demonstrate health and ecological risks related to effluent emissions by different productive sectors. When excessive amount of pollutants are introduced into the rivers they may reduce their biodegradation dynamics, reducing aquatic life diversity and relevant ecological services. Some important contributions to improve effluents control and treatment have also been discussed.
Avaliação da toxicidade do umectante não iônico e do corante reativo RED 239 submetidos à irradiação por feixe de elétrons
2018 - GARCIA, VANESSA S.G.; ROSA, JORGE M.; PEREIRA, MARIA da C.C.; BOIANI, NATHALIA F.; BORRELY, SUELI I.