Remediation of Spent Caustic in the Wastewater of Oil Refinery by Photo-Fenton Process

Karimi, Safoora; Shokri, Aref; Aghel, Babak

doi:10.29252/ArchHygSci.9.3.179

Volume 9, Issue 3 (Summer 2020) Arch Hyg Sci 2020, 9(3): 179-188 | Back to browse issues page

‎ 10.29252/ArchHygSci.9.3.179

‎ 20.1001.1.22519203.2020.9.3.5.6

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Karimi S, Shokri A, Aghel B. Remediation of Spent Caustic in the Wastewater of Oil Refinery by Photo-Fenton Process. Arch Hyg Sci 2020; 9 (3) :179-188
URL: http://jhygiene.muq.ac.ir/article-1-452-en.html

Remediation of Spent Caustic in the Wastewater of Oil Refinery by Photo-Fenton Process

Safoora Karimi ^*

¹, Aref Shokri²

, Babak Aghel³

1- Department of Chemical Engineering, Jundi-Shapur University of Technology, Dezful, Iran.
2- Department of Chemistry, Payame Noor University, Tehran, Iran
3- Department of Chemical Engineering, Faculty of Energy, Kermanshah University of Technology, Kermanshah, Iran

Abstract: (3326 Views)

Background & Aims of the Study: Currently, the advanced oxidation processes have received increasing attention for the treatment of industrial wastewater. In the present study, the photo-Fenton process was used for the remediation of the spent caustic in the wastewater of Kermanshah Oil Refining Company in Iran. The effluent comprising spent caustic is toxic dark brawn with a high level of alkalinity.
Materials and Methods: Diluted wastewater covering the spent caustic from Kermanshah Oil refinery was used in this study in September 2018. In addition, the effects of operative factors, such as the initial concentrations of hydrogen peroxide (H₂O₂), ferrous ion, and initial chemical oxygen demand (COD), have been investigated. The response surface method and Box-Behnken design of experiments were employed to examine the effects of three independent variables on the response function to obtain the optimum conditions.
Results: Analysis of variance was performed to determine the significance of the effects of independent variables on the response function. Various amounts of variables were optimized for the removal of COD. At optimum conditions (i.e., an H₂O₂concentration of 600 mg/l, ferrous concentration of 145 mg/l, and initial COD of 300 mg/l), the removal efficiency for COD was 91.5% after 60 min of reaction.

Conclusion: According to the obtained results, the suggested quadratic model demonstrated good correctness. The statistical analysis showed that the model was satisfactory to predict the performance of the process. The wastewater containing spent caustic cannot proficiently be degraded by ultraviolet radiation and hydrogen peroxide (H₂O₂) oxidation separately; however, the photo-Fenton method is verified to be operative and can considerably degrade this pollutant. One of the main disadvantages of this process in the treatment of spent caustic is that the optimum pH is near 3, and a considerable amount of acid is needed to neutralize and acidify the alkalinity of spent caustic.

Keywords: Biological oxygen demand analysis, Box-behnken design, Photo-Fenton Process, Spent caustic, Wastewater

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Type of Study: Original Article | Subject: Environmental Health
Received: 2020/06/7 | Accepted: 2020/06/23 | Published: 2020/07/18

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