Permeable Adsorbing Barriers for groundwater remediation from hexavalent chrome pollution

摘要

Chrome ions removal from aqueous solutions by adsorption onto an activated carbon (Aquacarb 207EA™ by Sutcliffe Carbon) and a South African coal char is illustrated. Different chrome concentrations, pH and salinity levels are tested. Experimental data are interpreted by means of a Langmuir approach-based model. Results show that a Permeable Adsorbing Barrier (PAB) made of Aquacarb 207EA™ can protect a shallow aquifer from topsoil Cr~((Ⅵ)) leaching even during heavy rainfalls and that Cr~((Ⅵ)) is desorbed in dry periods, when clean water crosses the PAB, without any dangerous release in the aquifer.