1. Department of Sanitary and Environmental Engineering, Universidade Federal de Minas Gerais, Antônio Carlos Av. 6627, ZIP 31270-901, Belo Horizonte, Minas Gerais, Brazil
2. Department of Microbiology, Universidade Federal de Minas Gerais, Antônio Carlos Av. 6627, ZIP 31270-901, Belo Horizonte, Minas Gerais, Brazil
3. Departments of Environmental Science and Technology, Federal Center of Technological Education of Minas Gerais, Amazonas Av. 5253, ZIP 30421-169, Belo Horizonte, Minas Gerais, Brazil