Sequencing Batch Reactor (SBR) for the removal of Hg2+ and Cd2+ from synthetic petrochemical factory wastewater

► We assessed SBR performances to treat synthetic wastewater containing Hg2+ and Cd2+. ► SBR was able to remove 76-90% of Hg2+ and 96-98% of Cd2+. ► COD removal efficiency and MLVSS was affected by Hg2+ and Cd2+ concentrations. ► Removal was not only biological process but also by biosorption process of sludge.