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Influence of Operating Parameters on the Fraction of Oil Oxidized During Electrocoagulation of Produced Water

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Abstract

Even though electrocoagulation (EC) is a waste treatment process which separates the pollutants from the bulk to a solid phase, it is often reported that a part of the waste is getting mineralized during EC. The present study aims at finding the best combination of operating parameters which can maximize the part of organic matter removed by an oxidative mechanism during the EC treatment of produced water. It is found that current density and salt concentration strongly influenced the fraction of chemical oxygen demand (COD) oxidized. At optimum operating conditions (current density, 0.75 A/dm2; time, 30 min; initial pH, 9; and salt concentration, 3 g/L), a maximum of about 77% COD was found oxidized from a stable oil-in-water emulsion of concentration 1280 mg/L. The corresponding total COD removal by EC was observed to be 82%. The proposed methodology is very much appropriate in terms of lower footprint for produced water treatment, especially in offshore basins, due to three reasons such as fast operation, lower sludge production, and the supporting electrolyte available in situ. Furthermore, based on the results obtained, a second-order regression model was proposed to predict the responses, viz. COD removal and fraction of COD oxidized. Analysis of variance (ANOVA) studies showed that the model is valid and equipped to predict the responses well, evident from the high R2 value of the model.

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Funding

This study was financially supported by the Centre for Engineering Research and Development (CERD), APJ Abdul Kalam Technological University Grant No. KTU/RESEARCH 3/1511/2015.

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  1. Government Engineering College Trichur, Thrissur, Kerala, India

    A. M. Manilal & P. A. Soloman

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  1. A. M. Manilal
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Manilal, A.M., Soloman, P.A. Influence of Operating Parameters on the Fraction of Oil Oxidized During Electrocoagulation of Produced Water. Water Conserv Sci Eng 5, 41–52 (2020). https://doi.org/10.1007/s41101-020-00083-9

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