The management of dioxins and heavy metals total emissions from stationary in a specified area.
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The scope of work for this project includes: 1) Establishing and updating of the emission inventory; 2) Monitoring for the stationary emission and the ambient environment; 3) Revision, integration, and impact assessment of dioxin and heavy metal emission regulations; 4)Investigating the speciation changes and emission reduction strategies of mercury from coal-fired boilers.
The total dioxin emission quantity in Taiwan is estimated to be 25.33~172.22 g I-TEQ/year in 2011 with an average of 55.74 g I-TEQ/year. As for the heavy metal emissions in 2011, the total lead emission is 10.366 metric tons/year, cadmium emission is 0.830 metric tons/year, mercury emission is 1.454 metric tons/year, and arsenic emission is 3.745 metric tons/year. The changes are small over the years.
Monitoring of dioxin emissions were done in non-steel refineries, crematoriums, coal-fired boilers, and electric arc furnace (EAF) fly ash treatment plants. All five of the monitoring completed was within the emission limit. However, the emissions detected from crematoriums had larger variability; a better control and management strategy is recommended. DL-PCBs accounted for 7%~11% of total dioxin. However, the WHO2005-TEF of dioxins and furans are lower than I-TEF. As for the heavy metal emissions, mercury emissions from cement rotary kiln tend to be higher due to processing of sludge from industrial wastes. Emissions of manganese and zinc from electroplating industry were high due to the raw material used. Chromium(VI) accounts for 8.6%~13.4% of total chromium emission from electroplating industry. Boilers using lump coals emit higher concentration of heavy metals. However, the number of such boilers is small, so is the total emission.
This year the ambient dioxin monitoring is targeted on the general monitoring stations and monitoring stations around major pollution sources. 4 more monitoring stations were added around major pollution sources comparing to last year’s project. The average ambient dioxin concentration monitored from general monitoring stations is the lowest in the past three years. Among all the newly added monitoring stations, highest concentration of dioxins was detected near the Shuimei Incinerator. However, it is still below the standards of Japanese ambient
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