Stabilization of residues obtained from the treatment of laboratory waste. Part 1--Treatment path of metals in a plasma melting system.
The objective of this study is to investigate the treatment path of metals during the plasma vitrification of fly ash, bottom ash, sludge, and activated carbon collected from a laboratory waste treatment plant. Sampling, digestion, and analysis procedures that followed the standard methods of the Taiwan Environmental Protection Administration were used to determine the composition of the input and output materials. The microstructure was qualitatively examined using a scanning electron microscope. The results show that the vitrification process successfully vitrified the toxic input materials into a stable, glassy, amorphous slag. During vitrification, metals with low boiling points (As, Cd, Hg, Pb, and Zn) were vaporized into the flue gas. Metals with high boiling points and high specific weights went into the ingot, and the residual metals remained in the molten materials as the slag. The distribution of metals shows their behavior during vitrification and can provide a reference for vitrifying hazardous materials.
Kuo
Yi-Ming
YM
Department of Safety, Health, and Environmental Engineering, Chung Hwa University of Medical Technology, Tainan, Taiwan, Republic of China. yiming@mail.hwai.edu.tw
Chang
Juu-En
JE
Chang
Kun-Yu
KY
Chao
Chih-C
CC
Tuan
Yeu-Juin
YJ
Chang-Chien
Guo-Ping
GP
D017745:Incineration; D019995:Laboratory Chemicals / Q000032:analysis* / Q000633:toxicity; D008670:Metals / Q000032:analysis*; D014866:Waste Products / Q000032:analysis*
D019995:Laboratory Chemicals; D008670:Metals; D014866:Waste Products