Removal of Lead from Groundwater Using Activated Carbon Derived from Water Melon Shield
Abstract
This study investigates the possibility of using the activated carbon derived from agricultural solid wastes including (watermelon shield) in the permeable reactive barrier (PRB) technologyfor the removal of Lead from a contaminated aquifer of shallow. The tests of the batch, the influence of several operating parameters such as time of contact a dsorbate with adsorbent (0-120 min), initial pH of the solution (3-8), sorbent dose (0.25-3 g/100 ml), lead ions concentration of initial (50-250 mg/l), and speed of agitation (0-250 rpm) were investigated. The values is the best of these parameters that will achieve removal of the maximum efficiency of Pb+2 (=94%) were120 min, 6, 3 g/100 ml, 50 mg./l and 250 rpm. respectively.
The model of Langmuir was chosen to describe the solute sorption on the solid phase of PRB. Consequently, the isotherm parameters (a and b) are equal to(4.950) mg/g and (0.087)l/mg respectively . Multiphasic 3.5a of COMSOL based on method of finite element was used for formulation the lead ions transport in two-dimension model of physical under condition of equilibrium.
These results certified that the functionality of barrier will decrease with time because the decreasing of retardation factor. Finally, agreement of a reasonable between predicted and results of experimental of the total distribution of Pb+2 ions of concentration across the bed of soil in the presence of activated barrier of carbon was recognized with mean error (ME) ?10%.
Keywords:removal,lead, groundwater, barrier,agricultural solid wastes.
