Aplicação de material zeolítico sintetizado de cinzas de carvão como adsorvente de poluentes em água

Fungaro, Denise Alves; Izidoro, Juliana de Carvalho; Bruno, Mariza

doi:10.1590/s0100-46702009000100007

Cited by 14 publications

(8 citation statements)

References 26 publications

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“…A isoterma da fibra de coco verde tratada com NaOH (Figura 9 D) é do tipo L-1, indicando que os sítios ativos de adsorção diminuem sua disponibilidade quando a concentração da solução aumenta [28]. Os modelos de isotermas de Langmuir e Freundlich são os mais frequentemente utilizados para descrever o equilíbrio de adsorção, técnica aplicada em tratamento de águas e efluentes [30]. A isoterma de Langmuir é muito utilizada em inúmeros processos de adsorção principalmente na adsorção de corantes sobre superfícies sólidas.…”

Section: Equilíbrio De Adsorçãounclassified

Avaliação de processo adsortivo utilizando mesocarpo de coco verde para remoção do corante azul de metileno

2018

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RESUMO Os resíduos agroindustriais são materiais alternativos e de baixo custo, uma vez que quantidades consideráveis destes são descartadas no ambiente, com potencial uso como materiais adsorventes na remoção de poluentes, por exemplo. Nesse sentido, este trabalho foi realizado com o objetivo de avaliar a utilização da fibra de coco verde, como adsorvente na remoção do corante azul de metileno em meio aquoso. O corante azul de metileno é muito utilizado pela indústria têxtil e encontra-se presente em seus efluentes podendo contaminar o ambiente. A fibra de coco verde foi tratada com HCl, NaOH e hexano. Os parâmetros avaliados foram pH, tempo de agitação, mecanismo cinético e equilíbrio de adsorção. Os dados cinéticos foram ajustados aos modelos de Pseudo primeira ordem, Pseudo segunda ordem, Difusão intrapartícula e Quimissorção, resultando como o mais adequado para o processo o modelo de Pseudo segunda ordem. As isotermas de adsorção foram delineadas aos modelos de Langmuir e Freundlich, sendo este último o que apresentou melhor ajuste para os dados experimentais obtidos. A capacidade máxima adsortiva foi verificada, sendo o tratamento com HCl (0,1 mol L-1) aquele que proporcionou aumento significativo na capacidade adsortiva máxima (166,7 mg g-1) da fibra de coco verde quando comparada a fibra de coco in natura e aos demais tratamentos. Os resultados mostraram que a fibra de coco verde, tratada com ácido clorídrico, pode ser utilizada como material adsorvente na remediação de poluentes orgânicos, como corantes catiônicos em efluentes líquidos.

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Section: Equilíbrio De Adsorçãounclassified

Avaliação de processo adsortivo utilizando mesocarpo de coco verde para remoção do corante azul de metileno

2018

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“…Feed coal and CCBs samples from Figueira ermal Power Plant (FTPP), located in southern Brazil, were chosen for this study because they are the combustion residues generated in Brazilian coal-fired power plants that present the major environmental problems related to their chemical composition according to previous studies [7,8]. Although the FTPP coal and some of its combustion products have been studied in some works [7][8][9][10][11][12][13][14][15][16][17], no a systematic characterization, has been done. e present work is to characterize, to evaluate and to correlate the physical and chemical characteristics of feed coal and combustion by-products from FTPP using several analytical techniques in order to compare these results with the samples from the same power plant a er its modernization as well as to propose environmental solutions to minimize the environmental impacts caused by the CCBs disposal.…”

Section: Introductionmentioning

confidence: 99%

Physical and Chemical Characteristics of Feed Coal and its by-products from a Brazilian Thermoelectric Power Plant

Izidoro

Miranda

Castanho

et al. 2019

J. Appl. Mat. Tech.

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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.

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“…Among the different forms of dumping, one of the most serious is industrial wastewater that contains a considerable amount and variety of chemicals that affect public health and the environment if released to untreated water bodies [2]. Effluents are formed by complex mixtures of chemical compounds.…”

Section: Introductionmentioning

confidence: 99%

PH Analysis of an Wastewater Treatment Plants (WWTP) in a Paper Recycling Industry

Soares¹,

Pinto²,

Alencar

et al. 2019

Int J Innov Educ Res

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The paper industry in its production process consumes a large amount of water, and the flow of effluent is very variable, being related to the manufacturing process used in production capacity. Effluents are formed by complex mixtures of chemical compounds. The wide composition variability among the effluents from the most diverse origins, added to the market entry of numerous chemical substances every year, which will become part of the effluents, makes the complete characterization of its composition very difficult. To characterize the effluent, some parameters are analyzed, which may be physical, chemical or bacteriological. The pH, which is directly related to the coagulation efficiency, as it influences the chemistry of the coagulants, their reactions in the aqueous environment, the predominant hydrolysed species and the variation in surface charge of colloids present in the effluent, where in the aqueous system it is typically measured by use of a pH meter. Therefore, the objective of this study was to perform an effluent treatment plant (ETE) analysis of a paper recycling industry, the inlet and outlet flow values of the WWTP, using the pH parameter, comparing the dry periods, flood and transition from August 2018 to July 2019. Initially, a survey of technical documents related to the effluent treatment process and the verification of the standard norms, in use in the Industry WWTP was carried out. The collections were performed bimonthly, observed at times that did not interfere in the results and identified according to CONAMA Resolution, nº 430/2011. The pH values obtained at the WWTP revealed an improvement in the quality of the effluent treated in accordance with current legislation. However, although the effluent was adequate for the release pattern, the high toxicity found in the inlet and outlet pH of the WWTP, evidences the need to define new treatment and / or control strategies to comply with the legislation regarding this parameter.

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Aplicação de material zeolítico sintetizado de cinzas de carvão como adsorvente de poluentes em água

Cited by 14 publications

References 26 publications

Avaliação de processo adsortivo utilizando mesocarpo de coco verde para remoção do corante azul de metileno

Avaliação de processo adsortivo utilizando mesocarpo de coco verde para remoção do corante azul de metileno

Physical and Chemical Characteristics of Feed Coal and its by-products from a Brazilian Thermoelectric Power Plant

PH Analysis of an Wastewater Treatment Plants (WWTP) in a Paper Recycling Industry

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