1. Professor, Dept. of Environmental Engineering, Federal Univ. of Triângulo Mineiro, Av. Dr. Randolfo Borges Júnior, 1250, Univerdecidade, 38064-200, Uberaba, MG, Brazil (corresponding author).
2. Professor, Dept. of Science and Environmental Engineering, Federal Univ. of Alfenas, Rodovia José Aurélio Vilela, 11999, 37715-400, Poços de Caldas, MG, Brazil.
3. Professor, Dept. of Environmental Engineering, Federal Univ. of Triângulo Mineiro, Av. Dr. Randolfo Borges Júnior, 1250, Univerdecidade, 38064-200, Uberaba, MG, Brazil.
4. Professor, School of Engineering of São Carlos, Univ. of São Paulo, Av. Trabalhador São Carlense, 400, Centro, 13566-590, São Carlos, SP, Brazil.