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Treatment of galvanic effluent through electrocoagulation process: Cr, Cu, Mn, Ni removal and reuse of sludge generated as inorganic pigment.
Favero, Bruno Matheus; Favero, Ana Carolina; da Silva, Daniela Coelho; Hubner, Patricia; Souza, Fernanda Siqueira; Souza Hamm, Janice Botelho.
Afiliação
  • Favero BM; Master in Environmental Impact Assessment, La Salle University, Canoas, Brazil.
  • Favero AC; Master in Environmental Impact Assessment, La Salle University, Canoas, Brazil.
  • da Silva DC; Laboratory of Soil Analysis, Federal University of Rio Grande do Sul, Porto Alegre, Brazil.
  • Hubner P; Analytical Centre of Chemical Engineering Department, Federal University of Rio Grande do Sul, Porto Alegre, Brazil.
  • Souza FS; Master in Environmental Impact Assessment, La Salle University, Canoas, Brazil.
  • Souza Hamm JB; Master in Environmental Impact Assessment, La Salle University, Canoas, Brazil.
Environ Technol ; 43(20): 3107-3120, 2022 Aug.
Article em En | MEDLINE | ID: mdl-33858284
Galvanic effluents are composed of a wide range of heavy metals, requiring adequate treatment to remove these contaminants and to meet the limits established by environmental agencies. Considering this aspect, the present study had as main objectives: (i) to evaluate the efficiency of the electrocoagulation (EC) in the treatment of a galvanic effluent, with the purpose of removing total Cr, Cu, Mn, Ni and (ii) reuse the sludge generated for inorganic pigment production. EC tests were carried out through factorial design 23 with triplicate central point. pH (3, 7, 11), reaction time (15, 22.5 and 30 min) and current density (10, 17.5 and 25 mA/cm2) were the control variables. Under ideal experimental conditions (pH 7.00; t = 22.5 min and DC = 17.5 mA/cm2) were removed 96.94% of Mn, 97.63% of Cu and 99.99% of total Cr and Ni, allowing to meet the limits provided in CONAMA Resolution 430/2011. The production of inorganic pigments from a mixture of 10% sludge (generated in the ideal experimental condition) and Al2O3 and TiO2 proved to be technically viable. It was obtained 8.27 g of a brown inorganic pigment, composed mainly of Al1.82Cr0.18O3, Ca0.999(Ti0.805Fe0.201)O2.899 and Fe2.18O4Ti0.42. Therefore, the results obtained demonstrate that EC is an effective technique in galvanic effluents treatment. The sludge generated in this process showed to be appropriated to be reused in inorganic pigment production and could be considered as an alternative to reduce the environmental impact related to electroplating process.
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Texto completo: 1 Coleções: 01-internacional Base de dados: MEDLINE Assunto principal: Purificação da Água / Metais Pesados Idioma: En Revista: Environ Technol Assunto da revista: SAUDE AMBIENTAL / TOXICOLOGIA Ano de publicação: 2022 Tipo de documento: Article País de afiliação: Brasil País de publicação: Reino Unido
Texto completo
Adicionar na Minha BVS
Imprimir
XML
PubMed Links
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Texto completo: 1 Coleções: 01-internacional Base de dados: MEDLINE Assunto principal: Purificação da Água / Metais Pesados Idioma: En Revista: Environ Technol Assunto da revista: SAUDE AMBIENTAL / TOXICOLOGIA Ano de publicação: 2022 Tipo de documento: Article País de afiliação: Brasil País de publicação: Reino Unido