The Study of Produced Water Treatment Using Integrated Electro Fenton – Granular Biological Method

Document Type : Research Paper


1 PhD. Student of Chemical Engineering, Dept. of Chemical Engineering, North Tehran Branch, Islamic Azad University, Tehran, Iran

2 Assist. Prof., Dept. of Chemical Engineering, North Tehran Branch, Islamic Azad University, Tehran, Iran


Produced water is the largest waste stream in the oil and gas industry. It is a mixture of inorganic and organic pollutants. The harmful effects of discharging untreated produced water on the environment and public health is a challenging concern. Nowadays, the integration of advanced oxidation process and biological treatment is of interest to the researchers. Investigating the relationship between AOP pretreated effluent and subsequent bioreactor performance can help to optimize these systems. In this research, biological treatment was first examined without pretreatment, and it was found that biological degradation alone is incapable of treating the sample, so the integrated method of electro fenton-biological treatment was studied. Electro fenton performed the pretreatment and bioreactor did the final treatment. Synthesized MCNT-Ce/WO3/GF cathode and the MWCNT/GO/Fe3O4 heterogeneous catalyst were used in the electro fenton process. BTEX removal test - as a produced water simulant - was done using aerobic granules bioreactor, electro fenton and their combination, respectively. After optimizing the pH and time variables, in order to study the interactive effects of temperature, catalyst load, applied current and electrodes distance, a Box-Behnken experimental design and response surface methodology were used to optimize the performance of proposed system. The experiment carried out in the calculated optimal conditions for the electro-fenton degradation process (temperature 30 °C, catalyst load 250 mg/L, current density 170 mA/m2 and electrode distance 1.5 cm). The BOD/COD ratio and COD removal was found to be 0.41 and 56.5%, respectively. In these conditions, effluent entered the granular bioreactor and the final COD removal of the sample was done up to 94%. Real produced water was fed into the electro-fenton reactor and its effluent was introduced to the aerobic granular bioreactor, results showed that integrated electro fenton-bioreactor removes organic pollutants up to 92.7± 0.2% and keeps the characteristics of the treated produced water within the environmental standard range.


Main Subjects

Akerdi, A. G., ES’Haghzade, Z., Bahrami, S. & Arami, M. 2017. Comparative study of GO and reduced GO coated graphite electrodes for decolorization of acidic and basic dyes from aqueous solutions through heterogeneous electro-fenton process. Journal of Environmental Chemical Engineering, 5, 2313-2324.
Ali, N. S. A., Muda, K., Amin, M. F. M., Najib, M. Z. M., Ezechi, E. H. & Darwish, M. S. 2021. Initialization, enhancement and mechanisms of aerobic granulation in wastewater treatment. Separation and Purification Technology, 260, 118220.
Arellano, M., Oturan, N., Pazos, M., Sanromán, M. Á. & Oturan, M. A. 2020. Coupling electro-fenton process to a biological treatment, a new methodology for the removal of ionic liquids? Separation and Purification Technology, 233, 115990.
Baird, R., Bridgewater, L. & Association, A. P. H. 2017. Standard Methods for the Examination of Water and Wastewater, Water Environment Federation Pub., New York, USA.
Derakhshan, M. & Fazeli, M. 2018. Improved biodegradability of hardly-decomposable wastewaters from petrochemical industry through photo-fenton method and determination of optimum operational conditions by response surface methodology. Journal of Biological Engineering, 12, 1-10. (In Persian)
Franca, R. D., Pinheiro, H. M., Van Loosdrecht, M. C. & Lourenço, N. D. 2018. Stability of aerobic granules during long-term bioreactor operation. Biotechnology Advances, 36, 228-246.
Freire, D. & Sant'anna, G. 1998. A proposed method modification for the determination of COD in saline waters. Environmental Technology, 19, 1243-1247.
Ganiyu, S. O., Zhou, M. & Martínez-Huitle, C. A. 2018. Heterogeneous electro-fenton and photoelectro-fenton processes: a critical review of fundamental principles and application for water/wastewater treatment. Applied Catalysis B: Environmental, 235, 103-129.
Gholizadeh, A. M., Zarei, M., Ebratkhahan, M., Hasanzadeh, A. & Vafaei, F. 2020. Removal of Phenazopyridine from wastewater by merging biological and electrochemical methods via Azolla filiculoides and electro-fenton process. Journal of Environmental Management, 254, 109802.
Gopinath, A., Pisharody, L., Popat, A. & Nidheesh, P. 2022. Supported catalysts for heterogeneous electro-fenton processes: recent trends and future directions. Current Opinion in Solid State and Materials Science, 26, 100981.
Görmez, F., Görmez, Ö., Gözmen, B. & Kalderis, D. 2019. Degradation of chloramphenicol and metronidazole by electro-fenton process using graphene oxide-Fe3O4 as heterogeneous catalyst. Journal of Environmental Chemical Engineering, 7, 102990.
Hassan, A. & Tzedakis, T. 2019. Enhancement of the electrochemical activity of a commercial graphite felt for vanadium redox flow battery (VRFB), by chemical treatment with acidic solution of K2Cr2O7. Journal of Energy Storage, 26, 100967.
Hedar, Y. 2018. Pollution impact and alternative treatment for produced water. E3S Web of Conferences, The 2nd International Conference on Energy, Environmental and Information System, 31, 03004.
Jiang, W., Lin, L., Xu, X., Wang, H. & Xu, P. 2022. Analysis of regulatory framework for produced water management and reuse in major oil-and gas-producing regions in the United States. Water, 14, 2162.
Kalantary, R. R., Farzadkia, M., Kermani, M. & Rahmatinia, M. 2018. Heterogeneous electro-fenton process by Nano-Fe3O4 for catalytic degradation of amoxicillin: process optimization using response surface methodology. Journal of Environmental Chemical Engineering, 6, 4644-4652.
Lai, W., Xie, G., Dai, R., Kuang, C., Xu, Y., Pan, Z., et al. 2020. Kinetics and mechanisms of oxytetracycline degradation in an electro-fenton system with a modified graphite felt cathode. Journal of Environmental Management, 257, 109968.
Li, J., Song, D., Du, K., Wang, Z. & Zhao, C. 2019. Performance of graphite felt as a cathode and anode in the electro-fenton process. RSC Advances, 9, 38345-38354.
Liu, Y., Li, K., Xu, W., Du, B., Wei, Q., Liu, B., et al. 2020. GO/Pedot: NaPSS modified cathode as heterogeneous electro-fenton pretreatment and subsequently aerobic granular sludge biological degradation for dye wastewater treatment. Science of The Total Environment, 700, 134536.
Long, B., Yang, C. Z., Pu, W. H., Yang, J. K., Liu, F. B., Zhang, L., et al. 2015. Tolerance to organic loading rate by aerobic granular sludge in a cyclic aerobic granular reactor. Bioresource Technology, 182, 314-322.
Monteil, H., Pechaud, Y., Oturan, N. & Oturan, M. A. 2019. A review on efficiency and cost effectiveness of electro-and bio-electro-fenton processes: application to the treatment of pharmaceutical pollutants in water. Chemical Engineering Journal, 376, 119577.
Nidheesh, P. V., Olvera-Vargas, H., Oturan, N. & Oturan, M. A. 2017. Heterogeneous electro-fenton process: principles and applications. Electro-Fenton Process, 85-110.
Oren, A. 2020. Ecology of Extremely Halophilic Microorganisms. In Vreeland, R. H. and Hochstein, L. I. ed. The Biology of Halophilic Bacteria. CRC Press. 25-53.
Paulchamy, B., Arthi, G. & Lignesh, B. 2015. A simple approach to stepwise synthesis of graphene oxide nanomaterial. Journal of Nanomed and Nanotechnol, 6(1), 1-4.
Paździor, K., Bilińska, L. & Ledakowicz, S. 2019. A review of the existing and emerging technologies in the combination of AOPs and biological processes in industrial textile wastewater treatment. Chemical Engineering Journal, 376, 120597.
Ramírez-Pereda, B., Álvarez-Gallegos, A., Rangel-Peraza, J. G. & Bustos-Terrones, Y. A. 2018. Kinetics of Acid Orange 7 oxidation by using carbon fiber and reticulated vitreous carbon in an electro-fenton process. Journal of Environmental Management, 213, 279-287.
Ren, W., Tang, D., Lu, X., Sun, J., Li, M., Qiu, S., et al. 2016. Novel multilayer ACF@ rGO@ OMC cathode composite with enhanced activity for electro-fenton degradation of phthalic acid esters. Industrial and Engineering Chemistry Research, 55, 11085-11096.
Shinde, P. A. & Jun, S. C. 2020. Review on recent progress in the development of tungsten oxide based electrodes for electrochemical energy storage. ChemSusChem, 13, 11-38.
Su, P., Zhou, M., Ren, G., Lu, X., Du, X. & Song, G. 2019. A carbon nanotube-confined iron modified cathode with prominent stability and activity for heterogeneous electro-fenton reactions. Journal of Materials Chemistry A, 7, 24408-24419.
Wang, W., Li, Y., Li, Y., Zhou, M. & Arotiba, O. A. 2020. Electro-fenton and photoelectro-fenton degradation of sulfamethazine using an active gas diffusion electrode without aeration. Chemosphere, 250, 126177.
Yang, W., Zhou, M., Oturan, N., Li, Y. & Oturan, M. A. 2019. Electrocatalytic destruction of pharmaceutical imatinib by electro-fenton process with graphene-based cathode. Electrochimica Acta, 305, 285-294.
Yu, F., Wang, Y. & Ma, H. 2019. Enhancing the yield of H2O2 from oxygen reduction reaction performance by hierarchically porous carbon modified active carbon fiber as an effective cathode used in electro-fenton. Journal of Electroanalytical Chemistry, 838, 57-65.
Yu, T. & Breslin, C. B. 2020. Graphene-modified composites and electrodes and their potential applications in the electro-fenton process. Materials, 13, 2254.