| 英文摘要 |
The scope of this project includes: (1) Establishing and updating of the dioxin and heavy metals emission inventory.(2) Monitoring dioxin, heavy metals and PBDEs for the stationary emission and the ambient environment.(3) Counseling the emission sources which had faild to meet the standards.(4) Investigating the speciation changes of mercury in cement plants and emission reduction strategies.(5)Assist with dioxin and heavy metals control, reduction, pollution incident.
The total dioxin emission quantity in Taiwan is estimated to be 52.65 g I-TEQ/year. As for the heavy metal emissions in 2013, the total lead emission is 13.88 metric tons/year, cadmium emission is 0.84 metric tons/year, mercury emission is 1.87 metric tons/year, and arsenic emission is 3.69 metric tons/year.
Dioxin emission monitoring for secondary zinc processing, secondary lead processing and RDF manufacturing were completed. Heavy metal emission monitoring for secondary aluminum processing, secondary cooper processing and crematoriums were completed also.
This year the ambient dioxin monitoring is targeted on the general monitoring stations and monitoring stations around major sources. Unusual emissions near the ShuiMei monitoring station was discovered and was improved. Comparing to last year‘s data, monitoring results are lower this year.
The monitoring results of ambient heavy metal concentrations are compliable to the EU air quality standards. Higher concentration of chromium(VI) was discovered around the Suao factory of the Taiwan Cement Corporation, which might be originated from its raw material, magnesia-chrome refractory bricks or chromium steel balls.
Compiling the results of regular monitoring stations, the ambient concentration of mercury is between 1.38~4.25 ng/m3. Higher concentrations of gaseous and particulate mercury are higher around an electric-arc furnace in Neipu and the Taiwan Cement Corporation‘s factory in Suao.
5 investigations were conducted around factories that use Polybrominated diphenyl ethers (PBDEs). Higher PBDEs concentration was monitored downwind of these plants. However the results were deemed reasonable according to similar investigation conducted in Japan.
This year 8 counseling services were provided to factories that exceed dioxins the emission limits.
The fate and transport of mercury in cement kilns was studied. Other than the mercury in the raw material, most of the mercury comes from the exhaust of preheating machine.
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