PHOTOCATALYTIC DEGRADATION OF SUGARCANE VINASSE: EVALUATION OF PARAMETERS THAT AFFECT TIO2/UV PHOTOACTIVITY

• Autor(a) principal: Souza, Renata Padilha de
• Data de Publicação: 2016
• Outros Autores: Lima, Ana Maria Ferrari, Pezoti, Osvaldo, Santana, Veronice Sluzarski, Gimenez, Marcelino Luiz, Fernandes-Machado, Nádia Regina C.
• Tipo de documento: Artigo
• Idioma: eng
• Título da fonte: Acta scientiarum. Technology (Online)
• Texto Completo: http://www.periodicos.uem.br/ojs/index.php/ActaSciTechnol/article/view/27440
• topic: vinasse; coagulation/flocculation; photocatalysis; toxicity.; Química Analítica Ambiental; vinasse; coagulation/flocculation; photocatalysis; toxicity

In this work, photocatalysis was employed in the treatment of vinasse using TiO2 and UV light. The parameters investigated were: TiO2 phases (anatase and rutile) and vinasse pre-treatments (coagulation/flocculation and dilution). The TiO2 catalysts employed were: Kronos without thermal treatment (100% anatase), calcined at 1000°C (33.5% anatase) and immobilized on glass slides (100% anatase); and P25 Degussa without thermal treatment (86.6% anatase). The results showed that natural coagulant removed about 50, 85 and 97% of COD, color and turbidity, respectively. However, pre-treatment followed by photocatalysis with TiO2 87% anatase removed 67% of COD within 48h of irradiation. Bioassays with Artemia salina confirmed the efficacy of the methodology. The treatments reduced the toxicity of vinasse by up to 10 times.