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The Oil Produced Water (OPW) is an effluent produced during the oil extraction process. Owing to its complex composition and toxicity it must be treated by wastewater treatment technologies. However, traditional facilities may be unable to remove all the anthropogenic or naturally occurring compounds. This can result in their discharge to surface water and ultimately affecting the sedimentary environment. The present work shows the application of two Advanced Oxidative Processes (AOPs), Photocatalysis and Photo-Fenton to treat two kinds of effluents: phenolic solution made in seawater, and a real sample of OPW from Rio Grande do Norte, Brazil. Two commercial catalysts were used: TiO 2 (for Heterogeneous-Photocatalysis process), and FeSO 4 .7H 2 O (for Photo-Fenton process). The catalysts were characterized by X-Ray Diffraction Analysis (XRD), and Diffusive Reflectance Spectroscopy (DRS). In the two AOPs the following parameters were evaluated: initial pH of effluent (acid, neutral and alkaline), presence of H 2 O 2 (0.3%v/v) and time under ultra-violet (UV) irradiation (254nm); aiming to find the suitable conditions for OPW treatment. The results showed an efficiency of 99% for phenol removal, despite the high content of salts present in seawater. In the treatment of the two effluents by the AOPs, the reaction reached chemical equilibrium in 1 h under UV irradiation (254 nm); the best pH to treat the effluents was pH 7, in the presence of H 2 O 2 (0.3%v/v) and by increasing temperature to 75°C (in the case of the real sample of OPW). The results of this work show that the two studied AOPs can be used in the oil industry, for OPW treatment and to treat effluents (with high salinity) contaminated with phenol, to remove organic compounds in order to reduce their toxicity, and consequently assist towards a better quality of the sedimentary environment. The best results were obtained by the Photo-Fenton process. TITULO: TRATAMENTO DE AGUA PRODUZIDA DE PETROLEO USANDO PROCESSOS OXIDATIVOS AVANCADOS: FOTOCATALISE HETEROGENEA E FOTO-FENTON RESUMO A Agua Produzida por Petroleo (OPW) e um efluente gerado durante o processo de extracao de oleo. Devido a sua composicao complexa e toxicidade, deve ser tratada por tecnologias de tratamento de aguas residuais. No entanto, as instalacoes tradicionais podem nao ser capazes de remover todos os compostos antropogenicos ou de ocorrencia natural, podendo resultar na descarga de efluentes contaminados por oleo em aguas da superficie e, em ultima analise, afetar o ambiente sedimentar. O presente trabalho mostra a aplicacao de dois Processos Oxidativos Avancados (AOPs), Fotocatalise-Heterogenea e Foto-Fenton para tratar dois tipos de efluentes: solucao fenolica em agua do mar e uma amostra real de OPW do Rio Grande do Norte, Brasil. Foram utilizados dois catalisadores comerciais: TiO 2 (para o processo Fotocatalise Heterogenea ) e FeSO 4 .7H 2 O (para o processo Foto-Fenton). Os catalisadores foram analisados por Difracao de Raios-X (XRD) e Espectroscopia de Reflexao Difusiva (DRS). Nos dois AOPs foram avaliados os seguintes parâmetros: pH inicial do efluente (acido, neutro e alcalino), presenca de H 2 O 2 (0,3% v/v) e tempo sob irradiacao ultravioleta (UV) (254nm); com o objetivo de encontrar as condicoes adequadas para o tratamento de OPW. Os resultados mostraram uma eficiencia maxima de 99% na remocao de fenol, apesar do alto teor de sais presentes na agua do mar. No tratamento dos dois efluentes pelos AOPs, a reacao atingiu o equilibrio quimico em 1 h sob irradiacao UV (254 nm); o melhor pH para tratar os efluentes foi pH 7, na presenca de H 2 O 2 (0,3% v/v) e aumentando a temperatura para 75 °C (no caso da amostra real de OPW). Os resultados deste trabalho mostram que as duas AOPs estudadas podem ser utilizadas na industria petrolifera, para tratamento de OPW e para tratar efluentes (com alta salinidade) contaminados com fenol, para remover compostos orgânicos a fim de reduzir a sua toxicidade e, consequentemente, manter a qualidade do ambiente sedimentar. Os melhores resultados foram obtidos pelo processo Foto-Fenton. PALAVRAS-CHAVE: Contaminantes. Tratamento. Agua Produzida de Petroleo . Agua marinha. Fotocatalise Heterogenea . Foto-Fenton. Processos Oxidativos Avancados (AOPs).

OIL PRODUCED WATER TREATMENT USING ADVANCED OXIDATIVE PROCESSES: HETEROGENEOUS-PHOTOCATALYSIS AND PHOTO-FENTON