| Summary: | 碩士 === 國立臺灣大學 === 環境工程學研究所 === 98 === Arsenics compounds and arsine are used in Semiconductor and opto-electronics industries and are usually used in manufacturing processes. Then, the process vent stream of industries contains toxic arsine and other arsenic compounds. The ambient concentration of particulate arsenic was measured by this paper is named of “ Evaluation of arsenical emission from semiconductor and opto-electronics facilities in Hsinchu, Taiwan”. It dedicates that the ambient concentration of arsenic particulate in Science Based Industrial Park, Hsinchu, Taiwan was exceed the ambient air level goal (AALG) of arsenic compound performed by the US EPA. It will be hazardous to the residents. Moreover, there is still no available Laws and regulations for arsenic pollution in Taiwan.
Therefore, in this study will use CALPUFF air pollution model to simulate the arsenic pollutant emission trends and concentration performance in Science Based Industrial Park in Hsinchu and Hsinchu city.The simulation of Science Based Industrial Park will use slug plume model with simple and complex terrian effects. Hsinchu city is use puff model with simple and complex terrian effects to simulate.
The Simulated result of Science Based Industrial Park find that，the simulate concentration is more lower than real ambient concentration in Science Based Industrial Park, Hsinchu. It may probably because of insufficient emission rate data from the source information caused this phenomenon. Simulation results show that in Hsinchu City, the high concentration area is all nearby the stack of the Science Based Industrial Park in day time, but the high concentration area is will move to the southwest direction from Science Based Industrial Park after 6:00 pm. And the high concentration area is becoming bigger, the highest concentration position began to leave the Science Based Industrial Park area. Speculated that arsenic particle is not only accumulate in the park, and will also accumulate in other regions of Hsinchu. In the end, the study using the same emission of arsenic in the year 2002, the regional conditions affect the dispersion of pollutants, that in 2002 the average amount of arsenic in the concentration of 5.68E-06 (μgm-3), and the year of the Mid-Autumn , winter, spring, diffusion of pollutants are discharged from the chimneys to the southwest of the main sources, this range is more Hsinchu Xiangshan District, Junan Town, and Baoshan Township border. Pollutants have spread to the north of Hsinchu Xiangshan District, the situation but less and concentration compared with the southwest is lower.Because the wind will change, proliferation of the extent of change, to become spread from the source to the east and northeast side of the majority, this region and for the East District, Hsinchu City near the Eastern border Jhubei block, also slightly spread position is to the Hsinchu Science Park source Xiangshan District, north-west and the Eastern. In 2002 the average monthly value of the maximum concentration of location and the occurrence of both in the Hsinchu Science Park, near the highest concentration of winter, the average monthly value of the whole, than the fall and spring, high summer, spring and summer the monthly average maximum concentration value of season the lowest.
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