title: Efficiency and toxicity: comparison between the Fenton and electrochemical processes.
abstract: This study aimed to determine the best method to treat a textile effluent containing the dye basic blue 99 (BB). Treatments by the electrochemical and the Fenton processes were compared by means of a 2(3) experimental design, and the interaction of experimental conditions for BB oxidation were determined. The electrochemical treatment gave better results in the presence of NaCl as electrolyte and high current density (30 mA cm(-2)); the Fenton reaction provided better results at H2O2 and Fe(2+) concentrations of 10 mg L(-1) and 0.5 mmol L(-1), respectively. Electrochemical treatment was 23 times faster than the Fenton reaction because formation of chlorinated species during electrooxidation significantly contributed to dye oxidation. Although the electrochemical process was more efficient, the resulting treated effluent was more toxic to Lactuca sativa germination and growth, which indicated some biotoxicity. Results demonstrated that both processes efficiently remediated effluents containing the dye BB, but they need to be combined with other processes to ensure complete adequacy of the effluent for disposal.
authors.affiliation: Technology Center of Federal University of Alagoas, Av. Lourival Melo Mota, s/n, Campus A.C. Simões, Tabuleiro do Martins, Maceió-AL 57072-970, Brazil.
authors.forename: Marcela Gomes
authors.initials: MG
authors.lastname: Tavares
authors.affiliation: Technology Center of Federal University of Alagoas, Av. Lourival Melo Mota, s/n, Campus A.C. Simões, Tabuleiro do Martins, Maceió-AL 57072-970, Brazil.
authors.forename: Danilo Henrique da Silva
authors.initials: DH
authors.lastname: Santos
authors.affiliation: Chemistry and Biotechnology Institute of Federal University of Alagoas, Av. Lourival Melo Mota, s/n, Campus A.C. Simões, Tabuleiro do Martins, Maceió-AL 57072-970, Brazil E-mail: zanta@hotmail.com; clp@qui.ufal.br.
authors.forename: Sheyla Jaqueline Albuquerque
authors.initials: SJ
authors.lastname: Torres
authors.affiliation: Technology Center of Federal University of Alagoas, Av. Lourival Melo Mota, s/n, Campus A.C. Simões, Tabuleiro do Martins, Maceió-AL 57072-970, Brazil.
authors.forename: Wagner Roberto Oliveira
authors.initials: WR
authors.lastname: Pimentel
authors.affiliation: Chemistry and Biotechnology Institute of Federal University of Alagoas, Av. Lourival Melo Mota, s/n, Campus A.C. Simões, Tabuleiro do Martins, Maceió-AL 57072-970, Brazil E-mail: zanta@hotmail.com; clp@qui.ufal.br.
authors.forename: Josealdo
authors.initials: J
authors.lastname: Tonholo
authors.affiliation: Chemistry and Biotechnology Institute of Federal University of Alagoas, Av. Lourival Melo Mota, s/n, Campus A.C. Simões, Tabuleiro do Martins, Maceió-AL 57072-970, Brazil E-mail: zanta@hotmail.com; clp@qui.ufal.br.
authors.forename: Carmem Lucia de Paiva E Silva
authors.initials: CL
authors.lastname: Zanta
mesh_terms: D055664:Electrochemical Techniques / Q000379:methods*; D006861:Hydrogen Peroxide; D007220:Industrial Waste; D010084:Oxidation-Reduction; D013783:Textile Industry; D014865:Waste Disposal, Fluid / Q000379:methods*; D014874:Water Pollutants, Chemical / Q000737:chemistry*; D018508:Water Purification
chemical_list: D007220:Industrial Waste; D014874:Water Pollutants, Chemical; D006861:Hydrogen Peroxide