SABINE NEUSATZ GUILHEN

SABINE NEUSATZ GUILHEN

(Fonte: Lattes)

Resumo

Possui graduação em Química com atribuições Tecnológicas e Biotecnológicas pelo Instituto de Química da Universidade de São Paulo (2005), mestrado (2009) e doutorado (2018) em Tecnologia Nuclear (Materiais) pelo Instituto de Pesquisas Energéticas e Nucleares (IPEN), Universidade de São Paulo. Tem experiência em Química Analítica com ênfase em Análise de Traços, atuando principalmente no desenvolvimento de métodos analíticos empregando técnicas espectrofotométricas (AAS, ICP OES e ICP-MS) para caracterização de amostras ambientais, arqueológicas, biológicas, forenses e nucleares. Atualmente, ocupa o cargo de Tecnologista em "Caracterização Química" no Centro de Química e Meio Ambiente (CQMA) do IPEN (CNEN/SP), onde desempenha atividades de pesquisa e desenvolvimento tecnológico em atendimento às demandas institucionais ligadas ao Ciclo do Combustível Nuclear e aos Programas de Pesquisa de caráter multidisciplinar, em apoio a projetos de Inovação Tecnológica e ao Programa de Pós-Graduação do IPEN/USP. Além disso, atua na geração de produtos tecnológicos e no desenvolvimento de materiais adsorventes de baixo custo e alto valor agregado visando o aproveitamento de materiais e resíduos naturais e/ou renováveis no tratamento de efluentes e rejeitos. (Texto extraído do Currículo Lattes em 4 maio 2023)

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Physical and chemical characteristics of feed coal and its by-products from a Brazilian thermoelectric power plant
2019 - IZIDORO, JULIANA de C.; MIRANDA, CAIO; CASTANHO, DAVI; ROSSATI, CARLOS; CAMPELLO, FELIPE; GUILHEN, SABINE N.; FUNGARO, DENISE A.; WANG, SHAOBIN
In this study, feed coal (FC) from the Figueira Thermoelectric Power Plant (FTPP), located in the state of Paraná (PR), Brazil was characterized by X-ray fluorescence (XRF), X-ray diffractometry (XRD), infrared spectroscopy (FTIR), thermogravimetric analysis (TGA), scanning electron microscopy (SEM), particle size distribution analysis by laser diffraction, loss of ignition (LOI), total carbon content (TC), pH and conductivity. FC-derived by-products (CCBs) collected at the FTPP were: bottom ash (BA), fly ash from cyclone filter (CA) and fly ash from bag filter (FA). In addition to the techniques used for feed coal characterization, CCBs were also characterized by total surface area (by using BET method), external surface area (by using laser diffraction), cation exchange capacity (CEC), bulk density, besides leaching and solubilization tests. FC sample contains 72.2% of volatile material, of which 55.3% is total carbon content. LOI, FTIR, TGA and TC analyzes corroborated with these results. The main crystalline phases in the FC sample were found to be quartz, kaolinite and pyrite. The elements As, Cr, Ni and Pb were encountered in the FC sample, indicating that the use of FTPP feed coal should be monitored due to the toxic potential of these elements. The three coal ashes were classified as class F according to ASTM and presented similar chemical composition, with total content of the main oxides (SiO2, Al2O3 and Fe2O3) above 72%. Ashes enrichment factor analysis (EF) showed that As, Zn and Pb concentrate mainly in fly ash from bag filter (FA), whereas the elements K and Mg presented higher enrichment in the bottom ash (BA) . All ashes presented quartz, mullite and magnetite as crystalline phases, as well as the same functional groups, related to the presence of humidity, organic matter and Si and Al compounds. XRD, XRF, TGA, FTIR, LOI and TC techniques were correlated and confirmed the obtained results. Total and external surface area values of CCBs were related to the total carbon content (TC), as well as to the results of particle size distribution and the scanning electron micrographs of the samples. On the other hand the CEC of the ashes showed relation with the particle size distribution and with the external surface area. Leaching and solubilization tests of CCBs showed that FA sample was considered hazardous and classified as class I waste, while CA and BA samples were considered non-hazardous and non-inert wastes and classified as class II-A. FA sample from Figueira power plant must be discarded only after treatment or a stringent disposal criterion must be followed to avoid contamination on site. In this work, feed coal sample was also compared to the CCBs samples generated from it. The results showed the differences between fuel and products through the different characterization techniques. In addition to contributing to the understanding of the relationship between coal and its combustion products, this work can also help to reduce the environmental impacts caused by the CCBs disposal, as well as can also be used to compare the characteristics of CCBs from FTPP with the new wastes that will be generated by the same thermal power plant that will be soon modernized.
Chemical, mineralogical and environmental characterization of combustion byproducts generated from mineral coal used for electricity production
2017 - IZIDORO, JULIANA de C.; MIRANDA, CAIO da S.; GUILHEN, SABINE N.; FUNGARO, DENISE A.
The coal combustion by-products, bottom ash (BA), fly ash from cyclone filter (CA) and fly ash from bag filter (FA), generated in a Brazilian thermoelectric power plant, were characterized by Xray fluorescence, X-ray diffractometry and leaching and solubilization tests. The material retention systems used in the Brazilian power plant from where these by-produtcts were sampled are showed in Figure 1. The three types of coal ashes presented similar chemical composition, with a total content of main oxides (SiO2, Al2O3 and Fe2O3) above 72% and were classified as class F (according to ASTM). The analysis of ash enrichment factor showed that arsenic, zinc and lead concentrate mainly on FA, whereas the elements that presented the greatest enrichment in the bottom ash (BA) and therefore present low volatility are K and Mg. All ashes presented quartz, mullite and magnetite as crystalline phases. In the leaching and solubilization study, the FA sample was considered hazardous and classified according to Brazilian regulation as Class I solid waste, whereas CA and BA samples were considered non-hazardous and not inert solid wastes and classified as Class II-A. Therefore, FA sample from this Brazilian power plant must be discarded only after treatment or stringent disposal criteria must be followed to avoid contamination on site.
Treatment of coal ash landfill leachate using zeolitic materials from coal combustion by-products
2018 - IZIDORO, JULIANA de C.; MIRANDA, CAIO da S.; GUILHEN, SABINE N.; FUNGARO, DENISE A.; WANG, SHAOBIN
Three different zeolitic materials derived from coal combustion by-products (CCBs) were used to treat local coal ash landfill leachate at the same power plant. The zeolitic materials properties were characterized in terms of mineralogical composition (XRD), chemical composition (XRF), total carbon content, morphological analysis (SEM), specific surface area (BET method), cation exchange capacity (CEC), loss of ignition, pH, conductivity and bulk density. XRD indicated that sodalite zeolite was formed in all the samples after hydrothermal activation of CCBs. One zeolitic product from baghouse fly ash (ZFB) presented the lowest SiO2/Al2O3 ratio, highest CEC and specific surface area, thus having a high capacity in removal of heavy metal pollutants. The zeolitic products were efficient to reduce arsenic concentration to a value below the legislation. All zeolitic materials also showed a significant removal of Ni, Cd, Zn and Co except of Cr at a dose of 10 g L-1. Thus, this work provides a sustainable strategy to resolution of solid waste from power plants.
Avaliação da remoção de elementos metálicos tóxicos presentes no efluente do aterro de cinzas de carvão mineral usando zeólita sintética
2017 - MIRANDA, CAIO da S.; IZIDORO, JULIANA de C.; GUILHEN, SABINE N.; FUNGARO, DENISE A.
A produção de energia elétrica usando carvão mineral gera diferentes tipos de resíduos que precisam ser dispostos adequadamente para não causar impactos ambientais significativos. Diversas técnicas têm sido adotadas para que haja a redução da lixiviação dos elementos metálicos tóxicos presentes nas cinzas. O preparo do aterro de cinzas usando camadas de calcário e argila foi usado como alternativa por uma usina termelétrica a carvão localizada na região sul do Brasil. A utilização das cinzas leves para a síntese de materiais de valor agregado, por outro lado, também pode amenizar esse problema pelo fato de reduzir a quantidade de resíduo a ser disposto. O objetivo do presente trabalho foi avaliar a remoção de elementos tóxicos presentes no efluente de um aterro de cinzas usando zeólitas sintetizadas a partir dos próprios resíduos de combustão do carvão. Os ensaios foram realizados em batelada empregando-se 10 g de zeólita/L e 20 g de zeólita/L. A comparação entre as concentrações dos elementos do efluente antes e após o contato com a zeólita, bem como as análises de pH e condutividade foram realizadas. Os resultados indicaram que cromo e arsênio foram os principais elementos tóxicos presentes no efluente do aterro de cinzas que apresentavam concentração acima do permitido pela legislação ambiental. Após o tratamento com a zeólita, a concentração de arsênio no efluente reduziu de 1,09 mg/L para 0,275 mg/L na dose de 10 g/L e ficou abaixo do limite de detecção do equipamento (< 0,01) na dose de 20 g/L. Para o cromo, não houve alteração da concentração, enquanto uma elevação dos valores de pH e condutividade do efluente foi observada. O presente estudo sugere que a zeólita de cinzas leves de carvão podem ser usadas como forma de tratamento de efluentes contendo elevados níveis de arsênio.