Iranian Research Organization for Science and Technology Advances in Environmental Technology 2476-6674 7 3 2021 08 01 Treatment of wastewater by a combined technique of adsorption, electrocoagulation followed by membrane separation 171 183 1099 10.22104/aet.2021.5133.1394 EN Yousef Dehghani Department of Chemical Engineering, Faculty of Engineering, Islamic Azad University, Marvdasht Branch, Marvdasht, Iran Bizhan Honarvar Department of Chemical Engineering, Faculty of Engineering, Islamic Azad University, Marvdasht Branch, Marvdasht, Iran Amin Azhdarpour Department of Chemical Engineering, Faculty of Engineering, Islamic Azad University, Marvdasht Branch, Marvdasht, Iran Moein Nabipour Department of Chemical Engineering, Faculty of Engineering, Islamic Azad University, Marvdasht Branch, Marvdasht, Iran Journal Article 2021 08 15 In this study, a combined lab-scale purification system was set up to treat wastewater from the National Iranian Oil Company. The combined system was composed of three main sections: pre-filtration using activated carbon filter (ACF), electrocoagulation (EC) system, and a filtration section (MF followed by RO). The performance of the treatment system was evaluated by measuring heavy metals, BOD, COD, TDS, TSS, and O&G. The results showed that pre-filtration using ACF could lead to the removal of the BOD, COD, TDS, TSS, and O&G by 24.6%, 21.12%, 31.07%, 36.9% and 8.49%, respectively; the heavy metals were removed significantly. In the EC section, heavy metals were rejected by more than 98% using both the Al and Fe electrode, except for the Cr ions that were mostly removed with Fe electrodes. The removal of BOD, COD, TDS, TSS, and O&G using the Al and Fe electrode was 95.6%, 96%, 91%, 76.6%, and 98.6% and 93.2%, 92.1%, 76%, 83% and 99%, respectively. EC followed by MF/RO filtration led to a remarkable purification performance, and the rejection rate of all pollutants was obtained over 99% after this section. The experimental results indicated that the optimum time for ACF and EC processes were 20 and 50 minutes. https://aet.irost.ir/article_1099_a0160709701140704575d499c997b6ca.pdf