| Summary: | 碩士 === 東海大學 === 環境科學與工程學系 === 97 === The expansion of high-tech industry is the way to upgrade the product value in many developing countries. In Taiwan, there are several science-based industrial parks, which generate tremendous high value-added export products, meanwhile they also may emit toxic substances into both air and water bodies. Some heavy metals are commonly found in the ambient air near industrial parks like arsenic, cadmium and lead, etc. This study conductes a survey program since Dec. 2007 to Mar. 2009, at the Central Taiwan Science Park (CTSP) in Taiwan. The types of CTSP industry include flat glass, aerospace, precision machinery, optoelectronics, semiconductor and other strategic research and development laboratories. This project allocates the sampling sites which cover the upstream and downstream of the emission sources according to the wind directions. The atmospheric particulate is collected through a PM10 high volume air sampler with quartz filter under the initial air flow rate of 1,132 L min-1 for 24 hours. The digested filter samples were analyzed by either flame or graphite type furnace of atomic absorption spectrophotometer.
First, this study is aiming at the distribution of ambient particulates (PM2.5 and PM10) and heavy metal component from the science-based park. Then use Principal Component Analysis (PCA) to find out the possible source. The ISCST3 (Industrial Source Complex Short Term 3 Model ) and AERMOD (AMS/EPA REGULATORY MODEL) models were adapted to simulate the heavy metal dispersion phenomena. Besides, this study also use the risk characterization to evaluate the risk level to the human beings.
The observed particle concentration, compared with reference, which indicates the particle becomes more and more small. It will be harmful to human bodies while the heavy metal concentration, which tends to be less than previous years due to the heavy economic recession since 2008. The study adapts PCA to category the possible pollution sources and based upon either the north and south wind seasons. The pollution sources on upward mostly were crustal elements and industrial processes, while the pollution sources at downward are mostly found from high-tech industry, industrials and vehicular emission. The simulation by ISCST3 model is too conservative to estimate and it is over-predicted than the measured. On the other hand, the AERMOD model obtains more close data to the measurement concentrations due to its inside framework. The risk characterization finds the hazard index and carcinogenic ratio is still far below limitation.
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