The capture of heavy metals from incineration using a spray dryer integrated with a fabric filter using various additives

This study investigated the effects of feedstock additives [polyvinyl chlor ide (PVC) and NaCl] and spray dryer additives (SiO2, CaCl2, NaHCO3) on heav y metal and fly ash removal efficiencies, and on particle size distribution of heavy metals. A spray dryer with an integrated fabric filter was used a s an air pollution control device (APCD). Removal efficiencies for fly ash and heavy metals were greater than 95 and 90%, respectively. When additives of PVC or NaCl were used, the concentration of heavy metals distributed in fly ash apparently varied when the particle diameter was <1 <mu>m. Althoug h the effects of the additives SiO2, CaCl2, and NaHCO3 on the elemental siz e distribution of Cr were insignificant, these additives did slightly incre ase concentrations of Cd, Zn, and Pb partitioning in coarser particles (>1 mum).