Influence of lead and copper on behavioural changes of compacted bentonite

抄録

In the garbage disposal site, a liner is installed to prevent contaminant migration and reducing the groundwater and surrounding environment getting polluted. Due to chemical stability, high swelling capacity, high specific surface area, low hydraulic conductivity, and high cation exchange capacity, bentonite clay is utilized as a liner material in the disposal site to stop the contamination of the surrounding environment. However, chemicals present inside the landfills may affect the liner properties. This investigation was carried out to determine the influence of heavy metal solution on the change in properties of compacted bentonite. In this study, the sorption and hydraulic conductivity of lead (Pb2+) and copper (Cu2+) were studied on the bentonite clay at an initial concentration of 100 and 1000 mg/L. Test parameter like pH, initial metal concentration, contact time, and agitation speed was examined. The results showed that the sorption capacity of the bentonite increased with a rise in the initial concentration of heavy metals. For an initial concentration of 1000 mg/L, the removal percentage for Pb2+ and Cu2+ was found to be 90.68 and 72.178, respectively. The outcome also reveals that the hydraulic conductivity value of the bentonite raised with the rise in Pb2+ and Cu2+ concentration.