Adsorption Properties of Microwave Modified Diatomite on Heavy Metals in Landfill Leachate

Adsorption properties of diatomite modified by microwave on lead, chromium and cadmium in landfill leachate under different conditions were studied with diatomite as adsorbent, and the best microwave modification conditions were determined in this study. Meanwhile, the adsorption and removal effects of diatomite on Pb, Cr and Cd in landfill leachate under different adsorption conditions were investigated and which including adsorbent dosage, adsorption time, temperature, pH and the ion strength. The results showed that the best adsorption removal efficient of heavy metal ion in landfill leachate can be obtained under the adsorption conditions of low ionic strength, alkaline leachate, with adsorption temperature of 25 °C, the adsorption time of 40 min, and the modified diatomite dosing quantity of 5∼10g/L.