Investigation of heavy metals concentration in landfill Leachate and reduction by different coagulants

The produced Leachate in waste disposal places is considered as one of the highly contaminated resources from physical, chemical, and biological point of view. The COD of Leachate is very high and contains a high amount of heavy metals like iron, cadmium, lead, nickel, and zinc. Therefore, the incurred harm by these metals to the soil and water resources makes the importance of reducing their levels in Leachate clear. In this research, the efficiency of heavy metals elimination using coagulants was tested. Sampling the Leachate, the concentration of heavy metals like cadmium, lead, zinc, and nickel as well as the COD of Leachate was measured. Then using Jar test, the optimal concentration of coagulants was determined.