Utilize este identificador para referenciar este registo: http://hdl.handle.net/10400.22/10232
Título: Impact of fluorides on the removal of heavy metals from an electroplating effluent using a flocculent brewer’s yeast strain of Saccharomyces cerevisiae
Autor: Machado, Manuela D.
Soares, Eduardo V.
Soares, Helena M.V.M.
Palavras-chave: Bioavailability
Chemical speciation
Heavy metals removal
Data: 2011
Editora: Taylor & Francis
Relatório da Série N.º: Chemical Speciation and Bioavailability;Vol. 23, Issue 4
Resumo: Besides several toxic heavy metals, electroplating effluents can have in solution different cations and anions, which may influence heavy metals removal by the biomass. Among them, fluorides are commonly used in the electroplating industries and thus can be found in the respective wastewaters. In the present work, the effect of the presence of fluorides in the efficiency of chromium(III), copper(II) and nickel(II) removal, from an effluent, by heat-inactivated cells of a brewing flocculent strain of Saccharomyces cerevisiae was evaluated. The presence of fluorides severely decreased (460%) the removal of chromium(III) by yeast biomass. This effect impaired the effective treatment of the effluent according to the US Environmental Protection Agency and the Portuguese law; conversely, a higher removal of copper(II) and nickel(II) was observed. This behaviour can be understood by metal speciation. In the presence of fluorides, chromium(III) was mainly complexed, becoming unavailable for yeast accumulation; this effect decreased the efficiency of chromium(III) removal. Thus, in the presence of fluorides, less chromium(III) is associated with biomass and consequently more yeast binding sites remain available for the uptake of other metals present in solution. This fact explains the increase of copper(II) and nickel(II) removal in the presence of fluorides.
URI: http://hdl.handle.net/10400.22/10232
DOI: 10.3184/095422911X13201614845796
Versão do Editor: http://www.tandfonline.com/doi/abs/10.3184/095422911X13201614845796
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