Silver removal in radiographic wastewaters

Authors

  • Edmilson Cesar Bortoletto UEM Author
  • Luciana Igarashi-Mafra UEM Author
  • Amanda Cristina Alfredo Contrucci Sorbo UEM Author
  • Naiara Aguiar Galliani UEM Author
  • Maria Angélica Simões Dornellas de Barros UEM Author
  • Celia Regina Granhen Tavares Engenharia Quí­mica - UEM Author

DOI:

https://doi.org/10.4025/actascitechnol.v29i1.83

Keywords:

efluente, adsorção, precipitação, filmes radiográficos, prata

Abstract

Fixing bath solution as well as radiographic wastewaters contain silver in deleterious concentration to the aquatic ecosystems. Unfortunately such effluents do not receive adequate treatment in order to remove such ion. Therefore the present work aimed to investigate silver removal from fixing baths and radiographic wastewaters from the odontological clinic of the University Hospital of Maringá. Treatments here investigated included precipitation of silver from fixing bath and adsorption in zeolites and activated carbon. The highest silver removal for the first treatment (around 84%) was obtained with 0.17 mol L-1 of H2O2. Concerning the adsorption process, it was concluded that zeolites A, X and mordenite were inefficient to retain the silver complex. Nevertheless activated carbon from babassu coconut was able to remove up to 0.42 mg of silver g-1 of activated carbon.

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Author Biography

  • Celia Regina Granhen Tavares, Engenharia Quí­mica - UEM
    Possui graduação em Engenharia Quí­mica pela Universidade Federal do Pará (1978), mestrado em Engenharia Quí­mica pela Universidade de São Paulo (1982), doutorado em Engenharia Quí­mica pela Universidade Federal do Rio de Janeiro (1992) e pós-doutorado em Engenharia Ambiental pela Université Montpellier II (1997-1998). Atualmente é professora associado ní­vel c da Universidade Estadual de Maringá. Tem experiência nas áreas de Engenharia Quí­mica e Engenharia Sanitária e Ambiental, com ênfase em Técnicas Avançadas de Tratamento de Efluentes, Tratamento Biológico de Efluentes Lí­quidos, Gestão e Tratamento de Resí­duos Sólidos e Gererenciamento e Monitoramento de Recursos Hí­dricos, atuando principalmente nos seguintes temas: Leito Fluidizado, Biossorcao, Adsorção, Resí­duo Sólido, Foto-oxidação catalí­tica, Processo de Tratamento com Reagente Fenton e Processos com Membranas. Currí­culo Lattes

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Published

2007-12-18

Issue

Vol. 29 No. 1 (2007)

Section

Chemical Engineering

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I Declare that current article is original and has not been submitted for publication, in part or in whole, to any other national or international journal. 

The copyrights belong exclusively to the authors. Published content is licensed under Creative Commons Attribution 4.0 (CC BY 4.0) guidelines, which allows sharing (copy and distribution of the material in any medium or format) and adaptation (remix, transform, and build upon the material) for any purpose, even commercially, under the terms of attribution.

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How to Cite

Bortoletto, E. C., Igarashi-Mafra, L., Sorbo, A. C. A. C., Galliani, N. A., Barros, M. A. S. D. de, & Tavares, C. R. G. (2007). Silver removal in radiographic wastewaters. Acta Scientiarum. Technology, 29(1), 37-41. https://doi.org/10.4025/actascitechnol.v29i1.83

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