Utilize este identificador para referenciar este registo: http://hdl.handle.net/10400.9/2520
Título: Biomass fly ashes as low-cost chemical agents for Pb removal from synthetic and industrial wastewaters
Autor: Barbosa, Rui
Lapa, N.
Lopes, M. Helena
Gunther, Annika
Dias, Diogo
Mendes, Benilde
Palavras-chave: Biomass
Fly ashes
Industrial wastewaters
Lead-acid batteries
Data: 2014
Editora: Elsevier
Citação: Barbosa, R.; Lapa, N.; Lopes, H.; Gunther, A.; Dias, D.; Mendes, B. Biomass fly ashes as low-cost chemical agents for Pb removal from synthetic and industrial wastewaters. In: Journal of Colloid and Interface Science, 2014, Vol. 424, p. 27-36
Resumo: The main aim of this work was to study the removal efficiency of Pb from synthetic and industrial wastewaters by using biomass fly ashes. The biomass fly ashes were produced in a biomass boiler of a pulp and paper industry. Three concentrations of Pb2+ were tested in the synthetic wastewater (1, 10 and 1000 mg Pb/L). Moreover, two different wastewaters were collected in an industrial wastewater treatment plant (IWWTP) of an industry of lead-acid batteries: (i) wastewater of the equalization tank, and (ii) IWWTP effluent. All the wastewaters were submitted to coagulation–flocculation tests with a wide range of biomass fly ashes dosage (expressed as Solid/Liquid – S/L – ratios). All supernatants were characterized for chemical and ecotoxicological parameters. The use of biomass fly ashes has reduced significantly the Pb concentration in the synthetic wastewater and in the wastewaters collected in the IWWTP. For example, the definitive coagulation–flocculation assays performed over the IWWTP effluent presented a very low concentration of Pb (0.35 mg/L) for the S/L ratio of 1.23 g/L. Globally, the ecotoxicological characterization of the supernatants resulting from the coagulation–flocculation assays of all wastewaters has indicated an overall reduction on the ecotoxicity of the crude wastewaters, due to the removal of Pb.
URI: http://hdl.handle.net/10400.9/2520
ISSN: 0021-9797
Versão do Editor: http://dx.doi.org/10.1016/j.jcis.2014.03.013
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