Degradação de atrazina, rifampicina e 17α-etinilestradiol em água residuária sintética por tratamento anaeróbio em reator tipo UASB combinado com processos avançados de oxidação

• Ano de defesa: 2020
• Autor(a) principal: Silva, Fernando Rodrigues da
• Tipo de documento: Dissertação
• Tipo de acesso: Acesso aberto
• Idioma: por
• Instituição de defesa: Universidade Tecnológica Federal do Paraná; Curitiba; Brasil; Programa de Pós-Graduação em Ciência e Tecnologia Ambiental; UTFPR
• Palavras-chave em Português: Águas residuais - Purificação - Oxidação; Toxicologia ambiental; Poluentes; Testes de toxicidade; Fotoquímica; Sewage - Purification - Oxidation; Environmental toxicology; Pollutants; Photochemistry; CNPQ::CIENCIAS EXATAS E DA TERRA::QUIMICA::QUIMICA ANALITICA::ANALISE DE TRACOS E QUIMICA AMBIENTAL; Ciências Ambientais
• Link de acesso: http://repositorio.utfpr.edu.br/jspui/handle/1/28958

This study aimed to investigate the degradation of Atrazine (ATZ), Rifampicin (RIF) and 17α- ethinylestradiol (EE2) in synthetic wastewater via Photolysis UVC and advanced oxidation processes (AOPs) UVC/H2O2, Fenton and photo-Fenton as isolated and, for the first time in the literature, as UASB type reactor post-treatment with ecotoxicological monitoring. A UASBtype reactor built in glass with 14L of useful volume was operated with an average organic loading rate of 2.09 kg COD m-3d-1 and average spiking of 390.8 µg L-1 of ATZ, 220.8 µg L-1 of RIF and 120.3 µg L-1 of EE2. Physicochemical parameters and micropollutants removal were analyzed to monitor biological reactor. The analytical method to determine these chemicals was developed using high-performance liquid chromatography (HPLC-DAD-FLD) combined with 1,000 times pre-concentration by solid phase extraction (SPE). Degradation tests by Photolysis UVC and AOPs were carried out in a conventional photochemical reactor (1,000 mL) in batches at 30, 60 and 90 min. The radiation source for Photolysis UVC and AOPs was performed through a high-pressure mercury-vapor lamp 125 W immersed into matrices. The UVC/H2O2 process was conducted with UVC radiation (quartz bulb) and H2O2 was reestablished in 100 mg L-1 at every 15 minutes. The radiation for photo-Fenton reactions was UVA-Vis (glass bulb). The Fenton and photo-Fenton degradations were carried out at pH 2.8, 5 mg L-1 of FeSO4•7H2O and 50 mg L-1 of H2O2. Acute toxicity was monitored by Daphnia magna and Lactuca sativa seeds. The analytical method to determine micropollutants showed adequate linearity (r² > 0.99) and SPE recovery levels were between 70 and 120%. Micropollutants limits of detection (HPLC-SPE) were 2.8 ng L-1 for ATZ, 3.4 ng L-1 for RIF and 3.1 ng L-1 for EE2. UASB-type reactor showed stability of anaerobic digestion with average removals of 90% for total COD and 80% soluble COD and, although it has not been designed to treat micropollutants, it removed 16.5% of ATZ, 45.9% of RIF and 15.7% of EE2. Isolated treatments by Photolysis UVC and UVC/H2O2 in 90 min as well as the biological effluent posttreatments via UVC/H2O2 and photo-Fenton at 30, 60 and 90 min demonstrated micropollutants global removals in higher levels than the HPLC-SPE limits of detection. Although the synthetic wastewater matrices before and after the biological treatment were different (carbonates, bicarbonates and organic matter), there was only significant difference (α = 0.05) in the micropollutants global removal via Fenton process (isolated and combined). The isolated treatments showed greater ammoniacal nitrogen removals. The greatest total phosphorus removal was observed in photo-Fenton post-treatment in 90 min and only this treatment did not present acute toxic effect for Daphnia magna and no significative ectotoxicological effect for Lactuca sativa seeds. In general, the most suitable treatments for polishing the type-UASB effluent were: UASB-foto-Fenton 90min > UASB-UVC/H2O2-60min > UASBUVC/H2O2-90min.