1. Department of Sanitary and Environmental Engineering, Federal University of Santa Catarina – UFSC. Address: Depto Engenharia Sanitária e Ambiental, Campus Universitário, Trindade, Florianópolis, SC, CEP: 88049–970, Brazil. E-mail: phsezerino@hotmail.com; lsp@ens.ufsc.br
2. Department of Agronomical and Environmental Sciences, Federal University of Santa Maria – UFSM, Campus Frederico Westphalen. Address: Linha 7 de Setembro, BR 386, Km 40, Frederico Westphalen, RS, CEP: 98400–000, Brazil. E-mail: bentoalep@hotmail.com; samaradecezaro@hotmail.com
3. Department of Sanitary and Environmental Engineering, Federal University of Santa Maria – UFSM. Address: Roraima ave., 1000, Room 540, Bldg 10, Santa Maria, RS, CEP: 97105–180, Brazil. E-mail: elvis.carissimi@pq.cnpq.br