Characterization of solids originating from the Fenton's process.
Fenton's process has proven to be a viable alternative for the oxidation of organic pollutants in mixed waste chemicals, with a high efficiency in the removal of heavy metals from the effluent as a side effect. However, a solid residue loaded with metals is obtained as a by-product. In this paper, the solids originating from the Fenton's oxidation of mixed waste chemicals from an academic laboratory were studied. The process was applied to different wastewater cases (two composite samples generated in different periods) in order to study the effect of their characteristics on the residues composition. Residues were evaluated and classified according to their leaching properties. In addition, a most comprehensive assessment of metal mobility in the residues was obtained by chemical speciation. The Fenton's residues were classified as hazardous according to Brazilian waste regulations. The application of the sequential dissolution procedure indicated that the metals in the Fenton's residues are mainly constituted of amorphous material (over 80%). Furthermore, the reactive fractions of the residues (exchangeable and amorphous iron oxide fractions) retain most of remaining metals. Therefore, the Fenton's residues present great potential for environmental contamination, and require an administration system and control of their final disposal.
Benatti
Cláudia Telles
CT
Departamento de Engenharia Química, Universidade Estadual de Maringá, Av. Colombo, 5790 Bloco D90, 87020-900 Maringá, PR, Brazil.
da Costa
Antônio Carlos Saraiva
AC
Tavares
Célia Regina Granhen
CR
D001938:Brazil; D004787:Environmental Pollution; D007220:Industrial Waste / Q000032:analysis*; D019216:Metals, Heavy / Q000032:analysis*; D009930:Organic Chemicals / Q000302:isolation & purification*; D014873:Water Pollutants / Q000302:isolation & purification; D018508:Water Purification / Q000379:methods
D007220:Industrial Waste; D019216:Metals, Heavy; D009930:Organic Chemicals; D014873:Water Pollutants