Keywords: groundwater remediation, heavy metals, permeable reactive barriers, adsorption, soil contamination, hexavalent chrome pollution, shallow aquifers, aquifer protection, leaching, environmental technology
Permeable Adsorbing Barriers for groundwater remediation from hexavalent chrome pollution
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.