| 英文摘要 |
The atmospheric PM2.5 ingredient proportion demonstrated that the majority sampling sites were highest in sulfate, next nitrate, followed by ammonium, organic carbon and last heavy metals. On average, sulfate was 27.3%, nitrate 14.6%, ammonium 13.4%, organic carbon 11.2% and heavy metals 2.3%.
PM2.5 mass concentration in flue gas for stationary sources showed that the electric arc furnace total particle matters (FPM + CPM) are the highest, approximately 6.5 mg/Nm3; next the food industry fuel oil boiler 4.7 mg/Nm3; followed by steel industry sintering plant 2.8 mg/Nm3; the coal-fired plant 1.76 to 1.85 mg/Nm3; and the municipal solid waste incinerator 0.7 mg/Nm3 is the lowest.
The dissipation of the PM2.5 demonstrated that coal store yard power plant PM2.5/TSP ratio was 0.19, the cement industry was between 0.10 to 0.13, the steel industry was between 0.08 to 0.15, and street dust was between 0.06 to 0.13. Carbon fractions were the most in fingerprints of PM2.5 of flue gas for fuel coal boiler and coal store yard in power plant. In steel industry flue gas, heavy metals were the main fraction for stationary sources whereas carbon, sulfate and calcium compounds for dissipation.
As secondary pollutants of sulfate in PM2.5 was the main portion for Taichung, we would suggest, together with surrounding neighbor cities and counties to look into the mitigation strategies for the traffic emissions. Local primary pollutants PM2.5 contribution to the amount of traffic sources was less than 15.7%.
To mitigate the PM2.5 in the region, the heavy load diesel trucks were fitted with catalyst particulate filter and this has been studied. Under the present air pollution control measure, we would suggest that the primary PM2.5 decrement goal may be 1,636 metric ton/year and secondary PM2.5 1,660 metric ton/year in the year of 2016. Furthermore, primary PM2.5 decrement goal to aim for is 1,781 metric ton/year and secondary PM2.5, 1,931 metric ton/year in 2021.
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