Abstract

• The aim of this research work is to reduce the concentration of Cd2+, Cr3+ and Pb2+ ions in three industrial wastewater samples from dry cell battery factory, nickel plating factory and leather factory in industrial zones I and II, Mandalay Region, Myanmar. The aquatic plant namely Hydrilla verticillata (L. F.) Royle (Mhaw Gyan) was used as dry biomass for the removal of heavy metal ions from three industrial wastewater samples within the optimum experimental conditions. The sorption parameters (optimum contact time and loading weight) were determined using Langmuir isotherm. According to the results, the experimental data for sorption of Cd2+ and Cr3+ ions were fitted to the Langmuir model except Pb2+. The optimum contact time and optimum loading weight were used for the removal of selected metal ions from three industrial wastewater samples. The result revealed that the removal order of metal ions from three industrial wastewater samples using dry biomass was found to be Cd2+ > Cr3+ > Pb2+ .