Silver removal in radiographic wastewaters

Authors

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

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

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

Issue

Vol. 29 No. 1 (2007)

Section

Chemical Engineering

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