Optimization of Induced Gas Flotation Parameters for Removal efficiency of Near-Water-Density Oils Using Response Surface Methodology

Articles in Press

Document Type : Research Article

Authors

1 Chemical Engineering Department, Faculty of Engineering, University of Sistan and Baluchestan

2 University of Sistan and Baluchesatn Zahedan

3 Department of Chemical Engineering, Faculty of Engineering, University of Sistan and Baluchestan, P.O.Box 98164-161, Zahedan, Iran.

Abstract

Induced gas flotation (IGF) is an efficient physical method for separating dispersed oil from produced water. This study optimized IGF parameters for oils with near-water density (specific gravity ≈ 0.9) using Response Surface Methodology (RSM). Experiments evaluated flotation time, air-flow rate, salinity, oil concentration, and temperature. Oil-separation efficiency, defined as the percentage ratio of recovered oil mass to the initial oil mass, was measured in a 2 L glass column equipped with a silicone-membrane bubbler. The RSM model identified flotation time and salinity as dominant factors (p < 0.05). Optimum conditions (45 min, 0.5 L min⁻¹ air flow, 20 g L⁻¹ salinity, 1000 ppm oil, 20 °C) yielded about 70 % removal efficiency. Higher temperature reduced efficiency due to increased oil solubility. The results confirm IGF’s applicability for challenging near-density oil systems and provide an experimentally validated optimization framework.

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Journal of Particle Science and Technology

Articles in Press, Accepted Manuscript
Available Online from 28 October 2025

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History

  • Receive Date: 03 April 2025
  • Revise Date: 17 October 2025
  • Accept Date: 28 October 2025

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