Iranian Research Organization for Science and Technology Advances in Environmental Technology 2476-6674 7 3 2021 08 01 Study of the performance of bench-scale electro-membranes bioreactor in leachate treatment 209 220 1120 10.22104/aet.2022.5266.1426 EN Mohammad Heidari Farsani Department of Environmental Engineering, Faculty of Natural Resources and Environment, Science and Research Branch, Islamic Azad University, Tehran, Iran Reza Jalilzadeh Yengejeh Department of Environmental Engineering, Ahvaz Branch, Islamic Azad University, Ahvaz, Iran 0000-0002-8360-5739 Alireza Hajiseyed Mirzahosseini Department of Environmental Engineering, Faculty of Natural Resources and Environment, Science and Research Branch, Islamic Azad University, Tehran, Iran Masoud Monavari Department of Environmental Engineering, Faculty of Natural Resources and Environment, Science and Research Branch, Islamic Azad University, Tehran, Iran Amir Hessam Hassani Department of Environmental Engineering, Faculty of Natural Resources and Environment, Science and Research Branch, Islamic Azad University, Tehran, Iran Nezamaddin Mengelizadeh Department of Environmental Health Engineering, Faculty of Health, Larestan University of Medical Sciences, Larestan, Iran Journal Article 2021 10 22 In the present study, the integration of the electrochemical process with a membrane bioreactor was used as a new technology for leachate treatment. In the electro-membrane bioreactor (EMBR), aluminum electrodes were used as anodes and cathodes. The EMBR was operated at a current density of 0.5 mA/cm² and a solids retention time of 90 days to remove common contaminants such as ammonia-nitrogen (NH₃-N), chemical oxygen demand (COD), phosphate (PO₄^3--P), and ultraviolet absorbance at 254 nm (UV₂₅₄). The maximum removal efficiencies of COD and NH₃-N were above 98%. The average removal efficiency of PO₄^3--P by the EMBR system was 93%, which was significant compared to previous studies. The removal rate of humic substances based on UV₂₅₄ was provided at approximately 96.95%. The trans-membrane pressure rate was acceptable for 80 days in the EMBR, which could be related to sludge size improvement and filtration resistance through the occurrence of electrocoagulation, electrophoresis, and electroosmosis mechanisms. The mean removal efficiencies in the EMBR were 90, 91.25, 96, and 87.5 % for chromium (Cr), cadmium (Cd), zinc (Zn), and iron (Fe), respectively. The slight change of mixed liquor-suspended solids (MLSS) in the leachate treatment reactor showed that the microorganisms in the new EMBR system had high adaptation. Based on the results, the EMBR is a promising technology to improve leachate treatment performance due to its excellent removal efficiency of common contaminants, metal removal, and reducing fouling. https://aet.irost.ir/article_1120_c6036a69be21cb660499b75718a3ef24.pdf