Vitrification of Incineration Ashes and Wastewater Sludge

• Main Authors: Kun-yu Chang, 張坤裕
• Other Authors: Wen-Jhy Lee
• Format: Others
• Language: zh-TW
• Published: 2009
• Online Access: http://ndltd.ncl.edu.tw/handle/43916506080099596595

碩士 === 國立成功大學 === 環境工程學系碩博士班 === 97 === This study focus on the vitrification of waste incineration ashes and wastewater sludge in the operational conditions of plasma system, and aims to understand the fate of heavy metals in vitrification processes. Furthermore, different addition fraction of cullet in ashes and sludge is used to investigate the effect of vitrification treatment when adding various addition ratios. The results showed that the vitrification behaviors of plasma system is similar to that in-laboratory by using high temperature electrode furnance. The majority of elements were existed in slag of out-put materials such as Ag(67.9%)、As(83.3%)、Ca(77.4%)、Cr(63.6%)、Mg(50.8%)、Mn(78.0%)、Mo(80.5%) and Na(53.3%). However, both Cu (75.3%) and Ni (61.3%) were mainly in the ingot; Cd (97.0%), Hg(40.0%), K(92.9%) and Se(54.2%) were primarily in the particulate of stack gas and Pb(81.6%) were mostly associated with gas phase. This result shows the dominant factors for controlling the fate of metal elements are their specific weight and boiling point. Separation-efficiency tests showed that Co, Cr, Fe, and Ni are with the best separation rate when cullet addition fraction is 30% (T30); however, that of Cu is T70 and Mn is T60. This result shows that adding too much cullet forms stereo glassy-network, increasing viscosity of slag which obstructs setlling properties and decrease separation efficiency of metal elements in ingot. Vitrifaction of both incineration ashes and wastewater sludge can achieve the goals of waste volume reduction, stabilization and recycling.