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

1 Master of Chemical Engineering, Faculty of Chemistry and Petroleum, Tabriz University, Tabriz, Iran

2 Faculty of Chemical and Petroleum Engineering, University of Tabriz, Tabriz, Iran

Abstract

The aim of this research is to optimize the treatment of wastewater containing petroleum and oil by modified coke (Coke wastes of petrochemical industries that were modified) as a cost-effective adsorbent, a substitute to activated carbon to remove oil pollution. The surface adsorption method is uncomplicated 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, pollutant concentration and amount of adsorbent parameters 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 wastewater 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.

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Journal of Petroleum Research
Volume 35, 1404-1 - Serial Number 140
Special Issue on the Development of the Hydrogen TechnologyChain
May and June 2025

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