FELIPE ARRELARO CAMPELLO

FELIPE ARRELARO CAMPELLO

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Column leaching test for the evaluation of immobilization of toxic elements in modified coal fly ash
2019 - IZIDORO, JULIANA; FUNGARO, DENISE; CAMPELLO, FELIPE; GUILHEN, SABINE
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.
Immobilization agents study of toxic elements in coal ash
2018 - IZIDORO, JULIANA; FUNGARO, DENISE; CAMPELLO, FELIPE; GUILHEN, SABINE
Metal leaching from coal fly ashes into the environment is of a much concern. A series of batch tests were performed to investigate the potential leaching of metals from fly ash modified with organosilane (OS) and quaternary ammonium surfactant (SF). The fly ash was collected at the Figueira Thermal Power Plant, located in the city of Figueira, State of Paraná. Firstly, the influence of ash mass/water volume ratio on the concentration of the elements in the leachates from untreated fly ash was evaluated. Subsequently, the capacities of immobilization of toxic elements by the different immobilizing agents were determined by measuring the pH and conductivity of the leachates from the treated fly ash. A significant reduction in the concentration of the elements was observed for all the leachate samples obtained from the ashes treated with OS. The concentrations were reduced by 89%, 77%, 42% and 11% for Cr, Mo, As and Se, respectively. When SF was used for the ash treatment, the concentration reduction in the leachates was found to be above 60% for all elements. These results show that both the OS and SF can be used as immobilizing agents for the retention of toxic elements presented in coal ashes.
Immobilization study of toxic elements present in coal ash through the treatment with immobilizing agents
2017 - CAMPELLO, F.A.; IZIDORO, J.C.; GHILHEN, S.N.; FUNGARO, D.A.
The capacyity to immobilize toxic elements present in coal ashes using organosilane (OS) and surfactant (SF) as immobilizing agents was determined by batch experiments. The coal ashes used in the study was collected at the Figueira Thermal Power Plant, located in the city of Figueira, State of Paraná. Firstly, the influence of ash mass/water volume ratio on the concentration of the elements in the leachates was evaluated. Subsequently, the capacities of immobilization of toxic elements using the different immobilizing agentes, pH and conductivity of the leachates were determined. A significant reduction in the concentration of the elements was observed for all leachate samples obtained from the ashes treated with OS. Concentration reductions using OS were 89%, 77%, 42% and 11% for Cr, Mo, As and Se, respectively. When SF was used to the ashes treatment, the concentration reduction in the leachates was above 60% for all elements. These results show that both the organosilane and the surfactant can be used as immobilizing agents for the retention of toxic elements present in coal ashes.
Estudo da imobilização de elementos tóxicos presentes nas cinzas de carvão por meio do tratamento com agentes imobilizadores
2017 - CAMPELLO, F.A.; IZIDORO, J.C.; GHILHEN, S.N.; FUNGARO, D.A.
A capacidade de imobilização de elementos tóxicos presentes nas cinzas de carvão usando orgânosilano (OS) e surfactante (SF) como agentes imobilizadores foi determinada por experimentos em batelada. As cinzas de carvão utilizadas no estudo foram coletadas na Usina Termelétrica de Figueira, localizada na cidade de Figueira, Estado do Paraná. Primeiramente, a influência da relação massa de cinzas/volume de água na concentração dos elementos nos lixiviados foi avaliada. Posteriormente, as capacidades de imobilização de elementos tóxicos usando os diferentes agentes imobilizadores, o pH e a condutividade dos lixiviados foram determinados. Observou-se uma significativa redução da concentração dos elementos para todas as amostras de lixiviados das cinzas tratadas com OS. As reduções de concentração usando OS foram de 89%, 77%, 42% e 11% para Cr, Mo, As e Se, respectivamente. No ensaio das cinzas tratadas com SF, a redução de concentração nos lixiviados estava acima de 60% para todos os elementos. Esses resultados mostram que tanto o orgânosilano, como o surfactante podem ser usados como agentes imobilizadores para retenção de elementos tóxicos presentes nas cinzas de carvão.