Suppressing effect of CaCO_3 on the dioxins emission from poly(vinyl chloride) (PVC) incineration

摘要

The effect of CaCO_3 addition on the emission of dioxins from poly(vinyl chloride) (PVC) incineration was investigated. It was found that incorporation of CaCO_3 greatly reduced the generation of polychlorinated dibenzo-p-dioxins (PCDDs) and dibenzo-furans (PCDFs) in the exhaust gas. Although the amount of PCDDs and PCDFs trapped in the ash increased, the total amount (the sum in the gas and ash) decreased significantly after CaCO_3 addition. The possible mechanism for the suppressing effect of CaCO_3 additive is discussed. The PCDDs and PCDFs trapped in the ash would not become environmental issues because they are expected to be decomposed by the TiO_2 photocatalyst, which was simultaneously incorporated in the PVC with CaCO_3.