Combination of Photoelectrocatalysis and Ozonation as a Good Strategy for Organics Oxidation and Decreased Toxicity in Oil-Produced Water

Author(s)

de Brito, Juliana Ferreira ^[1] ; Bessegato, Guilherme Garcia ^[1] ; Fraga de Toledo e Souza, Pedro Rafael ^[1] ; Viana, Tais Suelen ^[2] ; de Oliveira, Danielle Palma ^[2] ; Martinez-Huitle, Carlos Alberto ^[3] ; Boldrin Zanoni, Maria Valnice ^[1]

Affiliation

^[1] Univ Estadual Paulista UNESP, Inst Quim, BR-14800060 Araraquara, SP - Brazil

^[2] Univ Sao Paulo, Escola Ciencias Farmaceut Ribeirao Preto, BR-14040903 Ribeirao Preto, SP - Brazil

^[3] Univ Fed Rio Grande Norte UFRN, Inst Quim, BR-59078970 Natal, RN - Brazil

• Document type: Journal article
• Source: Journal of the Electrochemical Society; v. 166, n. 5, p. H3231-H3238, FEB 12 2019.
• Web of Science Citations: 1

Abstract

The oil-produced water generated during drilling of oil wells and gas extraction has been a cause for great concern since it contains a complexmixture of different organic and inorganic compounds, large amount of CO2, grease, salts, minerals, oils, and many hazardous compounds. The present work investigates the efficiency of photocatalysis (PC), photoelectrocatalysis (PEC), ozonation (O-3), and photoelectrocatalysis coupled with ozonation (PEC+O-3) in the removal of organic and inorganic contaminants in the oil-produced water monitored by Gas Chromatography-Mass Spectrometry (GC-MS) and Ionic Chromatography (IC) techniques. Parameters such as toxicity, which was investigated using Zebrafish embryos, color, turbidity, pH, quantity of dissolved solids, conductivity, chemical oxygen demand (COD), and concentrations of organic and inorganic carbon were also investigated. The best results were obtained by coupling PEC and O-3 techniques, which presented superior reduction in color (98%), turbidity (100%), inorganic carbon (99%), COD (73%), and a decrease of 96% in the fluoride and 35% in the chloride detected previously in the real oil-produced water. Among the 12 organic compounds identified in the oil-produced water, the PEC+O-3 treatment reached complete oxidation in eight of them and a lower Zebrafish embryo mortality occurred with 12.5% of dilution after 2 h treatment. (C) The Author(s) 2019. Published by ECS. (AU)

• FAPESP's process: 14/03679-7 - Degradation of hair dyes and salon wastewater by photoelectrocatalysis with modified TiO2 nanotube electrodes and combination with ozonation
• Grantee: Guilherme Garcia Bessegato
• Support Opportunities: Scholarships in Brazil - Doctorate (Direct)
• FAPESP's process: 15/18109-4 - Contribution of Nanostructured Materials in Electroanalysis of pharmaceuticals and dyes, in the oxidation and reduction photoeletrocatalytic process of Inorganic and Organic Pollutants and Water Disinfection.
• Grantee: Maria Valnice Boldrin
• Support Opportunities: Regular Research Grants
• FAPESP's process: 14/50945-4 - INCT 2014: National Institute for Alternative Technologies of Detection, Toxicological Evaluation and Removal of Micropollutants and Radioactivies
• Grantee: Maria Valnice Boldrin
• Support Opportunities: Research Projects - Thematic Grants
• FAPESP's process: 13/25343-8 - Simultaneous Oxidation of Organic Compounds in Wastewater Petroleum and Reduction of Dissolved CO2 by Photoelectrocatalysis
• Grantee: Juliana Ferreira de Brito
• Support Opportunities: Scholarships in Brazil - Doctorate