1. Ph.D. Student, Dept. of Hydraulics and Sanitation, School of Engineering of São Carlos, Univ. of São Paulo, Av. Trabalhador Sancarlense, 400, São Carlos 13566-590, São Paulo, Brazil.
2. Research Scientist, Microbial Resources Division, Research Center for Chemistry, Biology and Agriculture (CPQBA), Univ. of Campinas, CP 6171, Campinas 13081-970, São Paulo, Brazil.
3. Research Scientist, Dept. of Hydraulics and Sanitation, School of Engineering of São Carlos, Univ. of São Paulo, Av. Trabalhador Sancarlense, 400, São Carlos 13566-590, São Paulo, Brazil.
4. Professor, School of Technology, Univ. of Campinas, 1888 Paschoal Marmo St., Jd. Nova Itália, Limeira 13484-332, São Paulo, Brazil.
5. Professor, Dept. of Chemical Engineering, Federal Univ. of São Carlos, Rod. Washington Luiz, Km 235, SP 310, São Carlos 13565-905, São Paulo, Brazil.
6. Professor, Dept. of Hydraulics and Sanitation, School of Engineering of São Carlos, Univ. of São Paulo, Av. Trabalhador Sancarlense, 400, São Carlos 13566-590, São Paulo, Brazil (corresponding author).