Efeitos da fotólise e fotocatálise sobre a dinâmica de fármacos presentes em esgoto sanitário tratado biologicamente

• Ano de defesa: 2014
• Autor(a) principal: Bruna Coelho Lopes
• Tipo de documento: Dissertação
• Tipo de acesso: Acesso aberto
• Idioma: por
• Instituição de defesa: Universidade Federal de Minas Gerais; UFMG
• Palavras-chave em Português: Saneamento Meio ambiente e recursos hídricos; Saneamento
• Link de acesso: http://hdl.handle.net/1843/BUOS-9UNQM7

This study aimed to analyze the effects of photolysis (UVC) and heterogeneous photocatalysis (UVC-TiO2) on the dynamics of pharmaceuticals compounds, present in wastewater, in order to complement the biological treatment in a system consisting of UASB reactor and biological trickling filter. A photoreactor of emerged lamps was divided in two and one half received aluminum bars (U shape) with immobilized TiO2. In order to evaluate the effect of the incidence of ultraviolet radiation on the behavior of pharmaceutical compounds present in the treated sewage were used different hydraulic retention times (5, 10, 20, 40, 80 and 160 minutes). The samples were subjected to solid phase extraction (SPE) and analyzed on highperformance liquid chromatography (HPLC) Shimadzu linked to a mass spectrometer that combines QIT (ion trap) and TOF (time-of-flight) technologies. The pharmaceutical compound with the highest frequency of detection in treated wastewater was atenolol (93,7%), used in long-term for a number of cardiovascular diseases, followed by the antibiotics clindamycin (75%), sulfamethoxazole (56,2%) and trimethoprim (50%) which are drugs for short-term use. Despite the consumption of each drug profile change throughout the year, this does not directly influence the output concentrations of treatment UASB / FBP. Among the doses of radiation applied, the values between 57 and 63 mW.s.cm-² showed a superior behavior of photodegradation than photodissociation of pharmaceutical compounds present in domestic wastewater. The behavior of pharmaceuticals forward photolysis and photocatalysis were similar in either production or removal of compounds. In treated wastewater, the immobilization of titanium dioxide in a support of aluminum bars was not effective to increase the removal of pharmaceuticals exposed to a submerged UV photoreactor lamps, except for trimethoprim. Finally, attention should be paid to the composition of intermediate products in wastewater because they can promote a decline in the quality of the effluent due to the release of the biologically active form of the pharmaceutical after the exposure to radiation.