Effects of direct and alternating current on the treatment of oily water in an electroflocculation process

Brazilian Journal of Chemical Engineering

A. A. Cerqueira¹  P. S. A. Souza¹  M. R. C. Marques¹ 

[1],Universidade do Estado do Rio de Janeiro Instituto de Química Laboratório de Tecnologia AmbientalRio de Janeiro RJ ,Brasil

关键词: Electroflocculation;    Petroleum industry;    Produced water;    Alternating current;    Direct current;   

DOI  :  10.1590/0104-6632.20140313s00002363

来源: SciELO

【 摘 要 】

In the direct current mode (DC), widely used in electroflocculation (EC), the formation of an impermeable oxide layer on the cathode causes the declining of the efficiency of this process. This disadvantage has been reduced by adopting alternating current (AC). In this study, the effects of AC and DC on operational parameters such as the removal of oils and greases (O&G), color and turbidity from oil-in-water (O/W) emulsions of the petroleum industry using aluminum electrodes were investigated. Removal efficiencies of 95%, 97% and 99% of O&G, color and turbidity with energy consumption of 0.280 kWh/m³ and electrode consumption of 0.12 g and 0.18 g were achieved at a current density of 3 A, operation time of 3 minutes and initial pH of 9.0 using AC and DC, respectively. In continuous flow tests performed with the same experimental conditions, the electrode consumption at times up to 60 minutes were 1.6 g and 3.4 g using AC and DC, respectively.

【 授权许可】

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