Waste materials composited intoãnãdsorbent for landfill leachate treatment

Abstract

Theãbility ofã compositeãdsorbent composed primarily of various waste materials toãdsorb heavy metals, NH3-N,ãnd chemical oxygen demand (COD) from landfill leachate was investigated through batch sorption experiments. The study determined the optimal contact timeãndãdsorbent dosage for the removal of Pb, Zn, Cu, Fe, NH3-N,ãnd COD to be 15, 90, 30, 180, 30,ãnd 30 min, respectively. The corresponding optimumãdsorbent dosages were determined to be 5, 30, 5, 15, 5,ãnd 30 g, respectively. The compositeãdsorbent exhibited high removal efficiencies,ãchieving the following maximum values: 96.4% for Pb, 92.7% for Zn, 60.3% for Cu, 87.1% for Fe, 75.0% for NH3-N,ãnd 67.5% for COD. Pbãnd Fe showed the best fit withã Langmuir isotherm model, with correspondingãdsorption capacities of 0.0165ãnd 1.14 mg/g, respectively. For Zn, Cu, NH3-N,ãnd COD, the equilibrium data demonstrated the best fit withãn Elovich isotherm model, withãdsorption capacities of 0.004, 0.005, 0.016,ãnd 4.29 mg/g, respectively. The kinetic data followed the pseudo-second-order kinetic model. It presentedã potential solution for the disposal of the waste from which it was derived.