Removal of Cd-Pb-Hg heavy metal ion from simulation MSW incineration flue gas by modified mineral adsorbents

During MSW incineration process, many hazardous materials such as Pb, Hg and Cd will be volatilized and exhausted into the air. In this study, natural mineral and molecular sieve impregnated with two kinds of metal oxide were prepared for Cd 0 , Pb 0 , and Hg 0 removal from municipal solid waste (MSW) incineration flue gas. Here bentonite, mordenite, 4A molecular sieve and 5Amolecular sieve were used as carriers impregnated with CuO and CeO2 nitrate(or hydrochloride) solution respectively. The adsorption capacity for Hg 0 , Pb 0 and Cd 0 were tested at different temperature in the continuous fixed bed equipment. Results show that natural sorbents have lower adsorption capacity. After being modified, the adsorption capacity was increased greatly, SEM, EDS and BET analysis explain the change of adsorption capacity and the characteristic of these adsorbents. The adsorbents impregnated with CeO2 show the best effect on improving the adsorption capacity of these natural mineral adsorbents. The removal percentage was in the order of Cd 0 >Pb 0 >Hg 0 .