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| Author(s): |
Edgar Silveira Campos
Total Authors: 1
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| Document type: | Doctoral Thesis |
| Press: | Campinas, SP. |
| Institution: | Universidade Estadual de Campinas (UNICAMP). Faculdade de Engenharia Química |
| Defense date: | 2010-05-31 |
| Examining board members: |
Elias Basile Tambourgi;
Ranulfo Monte Alegre;
Ana Paula Brescancini Rabelo;
Priscila Gava Mazzola;
Fabiana Maria Salvador Navarro
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| Advisor: | Ana Lucia Figueiredo Porto; Elias Basile Tambourgi |
| Abstract | |
Approximately, different 10,000 dyes and pigments are for industrial use, representing an annual consumption of around 7 x 105 worldwide, 26,500 only in Brazil. In overall, dyes are toxic and recalcitrant substances, which are resistant to biological degradation. At the Sao Paulo's metropolitan region, three out of four textile industrial effluents have a positive mutagenic response, which makes dye contamination not only an environmental problem, but also a public health one. This work aims the selection and evaluation of Pseudomonas for textile effluent decolourization. Four Pseudomonas species were tested, P. oleovorans, P. cepacia, P. putida e P. aeruginosa, against 14 industrial dyes, where P. oleovorans showed to be the most promising one, it was capable to metabolize 12 dyes tested. Afterwards, P. oleovorans dye decolourization was optimized through two consecutive experimental designs, in which was possible to reduce the decolourization in half. The best conditions to P. oleovorans were achieved in anoxic conditions (0 RPM); initial pH of 8.5; 32°C; usage of 25% of total reactor; culture initial size of 0.16 g l-1; and dye concentration of 50 mg l-1. After the optimization, dye decolourization was performed in Fed-Batch, which increased the degraded dye mass 10-fold. At last, P. oleovorans was immobilized in Poly Urethane Foam (PUF), and packed in an anoxic reactor to the decolourization of a synthetic effluent. P. oleovorans was capable of decolourize the dye containing synthetic effluent in an anoxic reactor packed with PUF in only 24 hours, which increased the productivity in over than 6-fold when compared with Fed-Batch decolourization (AU) | |