| 英文摘要 |
The scope of this project includes: 1) Monitoring of stationary emissions and the ambient environment; 2) Establishing and updating of the emission inventory; 3) Planning and reviewing of dioxins and heavy metal emission reduction strategies.
1) Monitoring for the stationary emission and the ambient environment
This year the dioxin emission monitoring was done on small coal-fired boilers. The average dioxin concentration was 0.003 ng I-TEQ/Nm3, complying with the emission standard of 1.0 ng I-TEQ/Nm3.
Heavy metal and particulate matter emission monitoring were also completed on sintering plants. These results can be used as emission factors for estimating dioxin and heavy metals emission inventory.
This year the ambient dioxin monitoring was targeted on the general monitoring stations. The monitored concentrations of dioxin in March, May, August, and October, 2016, were 0.031 pg I-TEQ/m3 (0.027 pg WHO2005DF-TEQ/m3), 0.025 pg I-TEQ/m3 (0.022 pg WHO2005DF-TEQ/m3), 0.020 pg I-TEQ/m3 (0.017 pg WHO2005DF-TEQ/m3) and 0.047 pg I-TEQ/m3 (0.041 pg WHO2005DF- TEQ/m3), respectively. The monitored concentration of dioxin-like PCBs in March, May, August, and October, 2016, were 0.002 pg WHO2005-TEQ/m3, 0.003 pg WHO2005-TEQ/m3, 0.002 pg WHO2005- TEQ/m3, 0.003 pg WHO2005-TEQ/m3. Other than October, the monitoring results were lower than past few years
The monitoring of ambient heavy metal showed that the average concentrations of lead, cadmium, nickel and selenium are all under the ambient air quality standards published by EU.
This year the heavy metal concentration monitoring near Dacheng Township of Changhua County was also performed. The results were either very low or non-detected. The higher blood heavy metal in the residents may come from other sources such as food, water, or soil.
2) Establishing and updating of the emission inventory
The total dioxin emission quantity in Taiwan is estimated to be 53.863 g I-TEQ/year in 2015. Most of the emission came from the fugitive emissions such as burning of agricultural waste. Secondary sources include coal-fired power plants, boilers, sintering plants, electric-arc furnaces. As for the heavy metal emissions in 2015, the total lead emission is 32.4219 metric tons/year (±23.03%), cadmium emission is 0.9465 metric tons/year (±6.65%), mercury emission is 1.8788 metric tons/year (±5.15%), and arsenic emission is 4.3718 metric tons/year (±4.68%). The emissions of heavy metal from stationary sources are fairly constant over the years, therefore, this year the emissions of mobile sources were investigated. We’ve discovered that emissions of mobile sources are not to be ignored, especially for lead and arsenic. The emissions of heavy metal from burning of agricultural wastes also played a significant role in the air quality of the surrounding area.
3) Planning and reviewing of dioxins and heavy metal emission reduction strategies
To reduce the controversy regarding the correction of concentration to reference oxygen content, changes to the dioxin emission standards was proposed. Regulations for particulate emission from incinerators, heavy metal emissions, and local government stationary heavy metal emission inspection were also proposed.
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