Immobilization agents study of toxic elements in coal ash
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Environmental Impact IV
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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.
Como referenciar
IZIDORO, JULIANA; FUNGARO, DENISE; CAMPELLO, FELIPE; GUILHEN, SABINE. Immobilization agents study of toxic elements in coal ash. In: CASARES, J. (ed.); PASSERINI, G. (ed.); PERILLO, G. (ed.). Environmental Impact IV. Southampton, UK: WIT Press, 2018. v. 215p. 387-395. (WIT Transactions on Ecology and the Environment). DOI: 10.2495/EID180351. Disponível em: http://repositorio.ipen.br/handle/123456789/30084. Acesso em: 30 Dec 2025.
Esta referência é gerada automaticamente de acordo com as normas do estilo IPEN/SP (ABNT NBR 6023) e recomenda-se uma verificação final e ajustes caso necessário.