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Remoção da prata em efluentes radiográficos

2007; Editora da Universidade Estadual de Maringá (Eduem); Volume: 29; Issue: 1 Linguagem: Inglês

10.4025/actascitechnol.v29i1.83

1807-8664

Célia Regina Granhen Tavares, Edmilson César Bortoletto, Luciana Igarashi‐Mafra, Amanda Cristina Alfredo Contrucci Sorbo, Naiara Aguiar Galliani, Maria Angélica Simões Dornellas de Barros,

Healthcare and Environmental Waste Management

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.