Thermal
decomposition study of sewage sludge and of organicwaste used in the sorption
of metals |
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Authors: | A J M Barros J C O Santos S Prasad V D Leite A G Souza L E B Soledade M S B Duarte V D dos Santos |
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Institution: | (1) Departamento de Química, Universidade Federal da Paraíba, Joăo Pessoa, Brazil, CEP:58059-900, PB;(2) Departamento de Química, Universidade Estadual da Paraíba, Campina Grande, Brazil, CEP: 58109-790, PB;(3) Departamento de Engenharia Química, Universidade Federal de Campina Grande, Campina Grande, Brazil, CEP: 58109-970, PB;(4) Escola Agrícola de Lagoa Seca , Universidade Estadual da Paraíba, Campina Grande, Brazil, CEP: 58109-790, PB |
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Abstract: | The conventional treatments
of effluents containing heavy metals produce significant quantities of byproducts
with recalcitrant characteristics, making necessary looking after alternative
techniques in order to avoid the production of new contaminated residues.
Sorption process of chromium and zinc in vertical columns loaded with sewage
sludge and organic solid waste has been studied in this work. The data from
the TG curves of the two sorbents presented significant differences when they
were submitted to the metal uptake, being noticed the displacement of the
thermal events towards lower temperatures for both types of sorbents studied.
As it was expected, for both sorbents, an increase in the mass of samples
has been observed at the completion of the thermal tests upon metal uptake.
Therefore, these facts demonstrate that during the biosorption process a physico-chemical
interaction took place between sorbents and metals, as it was evidenced by
the more than 100 K increase in the decomposition temperatures as well as
the variation of the ΔH values of the
samples. |
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Keywords: | biosorption DSC heavy metal organic solid waste sewage sludge TG |
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