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Inventory of Heavy Metal Emission from Stationary Source, the Evaluation of Control Technology and the Strategies of Management and Reduction of Heavy Metals.

Absrtact	In this project, we implemented the emission inventory of heavy metals (Pb, Cd, Hg and As) for the coal-fired power plants, cement kilns, sinter plants and electric arc furnace. Besides, arsenic emission inventory from the semiconductor plants was also done. We have finished the emission factors, emission inventories and risk assessment of heavy metal. We also evaluated the mercury distribution and collected the method for the reduction of heavy metal. Based on the sampling databases of the Taiwan EPA, we found the main heavy metal emission sources are cement kilns, municipal solid waste incinerator, electric arc furnace and coal-fired power plant. We also investigated and analyzed the distribution of mercury for a coal-fired power plant, cement kiln and electric arc furnace. We found that mercury mass balance was about 95.7 % and 97.2 percent of mercury was from the coals for coal-fired power plant. After all the coal was burned, 63.8 percent of the mercury was in the fly ash. For the electric arc furnace, mercury mass balance was about 164.5 % and the main mercury source was from the steel scraps (59.8%) and alloy materials (31.9%). 82.9 percent of the mercury was in the fly ash after melting. The mercury mass balance for the cement kiln was only 53.5%. 75.6 percent of the mercury was from the limestone. Most of the mercury will be in the cement product. The results of the risk assessment of heavy metals for the stationary pollution source indicated that carcinogenic risks and non-carcinogenic risks of the heavy metal were both lower than the standard of health risk 10-6 except the Hoping power plant (1.13×10-6) and Hoping cement kiln plant (1.75×10-6). It may be attributed the fact that the emission concentrations of arsenic were higher. Due to the sampling data was few; heavy metal sampling is necessary in the future. Besides, we have collected the strategies of management and control of heavy metals by other countries and finished the draft of the mercury emission limit for the coal-fired power plant and then gave Taiwan Environmental Protection Administration (EPA) the suggestion of the related policy.
Keyword	Coal-fired power plant,Cement kiln,Sinter plant,Electric arc furnace, Heavy metals,Mercury,Arsenic

Absrtact

In this project, we implemented the emission inventory of heavy metals (Pb, Cd, Hg and As) for the coal-fired power plants, cement kilns, sinter plants and electric arc furnace. Besides, arsenic emission inventory from the semiconductor plants was also done. We have finished the emission factors, emission inventories and risk assessment of heavy metal. We also evaluated the mercury distribution and collected the method for the reduction of heavy metal. Based on the sampling databases of the Taiwan EPA, we found the main heavy metal emission sources are cement kilns, municipal solid waste incinerator, electric arc furnace and coal-fired power plant. We also investigated and analyzed the distribution of mercury for a coal-fired power plant, cement kiln and electric arc furnace. We found that mercury mass balance was about 95.7 % and 97.2 percent of mercury was from the coals for coal-fired power plant. After all the coal was burned, 63.8 percent of the mercury was in the fly ash. For the electric arc furnace, mercury mass balance was about 164.5 % and the main mercury source was from the steel scraps (59.8%) and alloy materials (31.9%). 82.9 percent of the mercury was in the fly ash after melting. The mercury mass balance for the cement kiln was only 53.5%. 75.6 percent of the mercury was from the limestone. Most of the mercury will be in the cement product. The results of the risk assessment of heavy metals for the stationary pollution source indicated that carcinogenic risks and non-carcinogenic risks of the heavy metal were both lower than the standard of health risk 10-6 except the Hoping power plant (1.13×10-6) and Hoping cement kiln plant (1.75×10-6). It may be attributed the fact that the emission concentrations of arsenic were higher. Due to the sampling data was few; heavy metal sampling is necessary in the future. Besides, we have collected the strategies of management and control of heavy metals by other countries and finished the draft of the mercury emission limit for the coal-fired power plant and then gave Taiwan Environmental Protection Administration (EPA) the suggestion of the related policy.

Keyword

Coal-fired power plant,Cement kiln,Sinter plant,Electric arc furnace, Heavy metals,Mercury,Arsenic