Removal of Oil (Petroleum Material) from the Waste Water of Recycling unit of Tabriz Refinery by Modified Coke Instead of Activated Carbon

Document Type : Research Paper

Authors

Faculty of Chemistry and Petroleum Engineering, Tabriz University, Tabriz, Iran

Abstract

Water pollution with petroleum compounds is one of the most important environmental problems and has adverse effects on the environment and human health; Therefore, it is necessary to treat wastewater containing petroleum substances with optimal and economic methods. The aim of the this research is to optimize the treatment of wastewater containing petroleum and oil by modified coke as a cost-effective adsorbent, an alternative to activated carbon to remove oil pollution. The surface adsorption method is easy to operate and economical if the adsorbent used is not expensive. In this research, after preparing modified coke by KOH method and performing identification tests such as FTIR, XRD, BET, SEM, parameters affecting absorption were optimized by Design Expert software. The effect of time parameters, pollutant concentration and amount of adsorbent was investigated. The optimal value of the parameters, the adsorbent dose equal to 1(g/L), during the time 1(h)  and the pollutant concentration equal to 57(ppm)  were obtained. The investigation of kinetic models and equilibrium isotherms showed that the absorption kinetics follows the quasi-quadratic model (R2 = 0.8257) and the adsorption isotherms follows the Freundlich model. The results show that using 1 gram/liter of this adsorbent can remove 85.30% of oil (petroleum substances) from refinery effluent within 2 hours. Also, the negativity of Gibbs free energy change and enthalpy changes indicate that the reaction is spontaneous and exothermic. Therefore, modified coke, as a low-cost and environmentally friendly adsorbent, can have a favorable ability to remove oil pollution from aqueous solution.

Keywords

Main Subjects

References

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Journal of Petroleum Research
Volume 35, 1404-2 - Serial Number 141
July and August 2025
Pages 71-85

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