Effect of pH and Initial pb(II) Concentration on The Lead Removal Efficiency from Industrial Wastewater Using Ca(OH)2

The effect of pH and initial concentration of lead ions on the removal of Pb(II) using Ca(OH)2 as precipitant agent were investigated. In order to analyze the precipitation process, seven initial Pb(II) concentration (100, 200, 300, 400, 500 and 600 mg/L) and five pH levels (3,5,7,9 and 11) were studied. The precipitation experiments were carried out using jar test equipment. This study was a batch method that involves the mixing of Ca(OH)2 with Pb(II) containing solutions to occur nucleation and solid growth and subsequent separation of solids (precipitates) from solution by filtration. The experiments were conducted for both actual and synthetic wastewater. The result showed that the removal efficiency was increased by increasing of pH and initial concentration of lead. The high pH levels showed better performance than the low levels in the removal of lead ions from both actual and synthetic wastewater. The highest removal efficiencies for actual and synthetic wastewater were 88% and 95% at pH 11, respectively. The result of this study showed that the Precipitation process using Ca(OH)2 is a suitable and efficient technique for the removal of lead ions from industrial wastewater in the pH range of 9-11.