Formation of heavy metal species during PVC-containing simulated MSW incineration.
The effect of PVC-derived chlorine on heavy metal emissions in MSW incineration was investigated using a tubular furnace and simulated MSW spiked with PVCs and heavy metals (Cd, Cr, Cu, and Zn). The molar ratio of the chlorine content to that of the heavy metal (Cl/M ratio) was varied from 3-200 as one parameter. The results indicated that the major species found in the fly ash were chlorides of alkaline and alkali-earth metals, whereas those identified in the bottom ash were MgSiO3, SiO2 and some complex aluminates and silicates. The emission of heavy metals and/or their compounds, with extreme and medium volatility, tended to be enhanced within the lower Cl/M range, whereas those with a refractory volatility were likely to be affected within the higher Cl/M range. However, those with an extremely refractory volatility were less affected by an increase of the Cl/M ratio. The variation of speciation and partitioning in MSW combustion as affected by the Cl/M ratio are discussed.
Chiang
K Y
KY
Department of Environmental Engineering and Science, Feng-Chia University, Tai-Chung, Taiwan, ROC.
Wang
K S
KS
Tsai
C C
CC
Sun
C J
CJ
D004784:Environmental Monitoring; D017745:Incineration; D019216:Metals, Heavy / Q000032:analysis*; D011143:Polyvinyl Chloride / Q000737:chemistry*; D012037:Refuse Disposal; D014835:Volatilization
D019216:Metals, Heavy; D011143:Polyvinyl Chloride