Electrochemical treatment of fresh, brine and saline produced water generated by petrochemical industry using Ti/IrO2–Ta2O5 and BDD in flow reactor

CATEGORY: PRODUCED WATER
Chemical Engineering Journal, Volume 233, November 2013, Pages 47–55
Electrochemical treatment of fresh, brine and saline produced water generated by petrochemical industry using Ti/IrO2–Ta2O5 and BDD in flow reactor
André Jailson Cabral da Silva (a), Elisama Vieira dos Santos (b), Crislânia Carla de Oliveira Morais (a), Carlos Alberto Martínez-Huitle (b), Suely Souza Leal Castro (a)
a Faculty of Natural and Exact Sciences, University of State of Rio Grande do Norte, CP 70, 59620-625 Mossoró, RN, Brazil
b Institute of Chemistry, Federal University of Rio Grande do Norte, Campus Universitário s/n, CEP 59078-970 Natal, RN, Brazil
Abstract
Describes results of a study which compares the anodic oxidation of three classes of produced water (PW) (fresh, brine and saline) generated by the petrochemical industry using Ti/IrO2–Ta2O5 and BDD electrodes in a flow reactor. During electrochemical treatment, various operating parameters were investigated, such as temperature, pH, conductivity, current density, total organic carbon (TOC), chemical oxygen demand (COD) as well as energy consumption and cost.
When both electrodes materials are compared under the same operating conditions, higher TOC and COD removal efficiencies were achieved for BDD anode. However, the energy consumption and cost were higher when compared with the values estimated for Ti/IrO2–Ta2O5. Different Cl– concentrations in the effluents promoted the electrogeneration of strong oxidant species, such as chlorine and hypochlorite, increasing the efficiency of treatment.
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