The concentration distribution of heavy metals under different incineration operation conditions

The current work was performed to relate the waste composition and operating temperature to the metal partition in the sand bed, the fly ash and in the gas phase by conditioning an indicating experiment (1) the organic chloride (PVC) additive, (2) inorganic chloride (NaCl) additive and (3) NaNO3 and PVC additives, under various operating temperatures. Furthermore, the fly ash was analyzed by X-ray diffraction (XRD) to identify the metallic compound for understating the mechanism of metal partition. The findings indicated that when the feedstock contains organic chloride (PVC), the metallic chlorides of lead and cadmium were the major compounds under XRD analysis results. The metallic chlorides decrease the absorption efficiency of heavy metals in the sand bed and increase that in the fly ash. When the feedstock contains the other materials, metallic oxides were the major compounds of the three metals. In addition, the affinity of sodium for chlorine is higher than the three heavy metals.