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The high technology electronic industries are the superior those in Republic of China. Under the support and the assistance of the R.O.C. government for a long time, they have grown up and become to the top industries over the world. Based on the theoretical rule considerations of the five countries and the practical testing results of 18 stacks, the air pollution problems of volatile organic compounds emitted by the eight factories of the three electronic industries are evaluated. They represent the semi-conductor, the optronics, and the printed circuit board industries. In this study, the computed results of the emission rates of the three electronic industries indicate that the one factory of the semi-conductor provides 10.71 ton-VOCs/year, 3 factories of the optronics contribute 890.18 ton-VOCs/year, and 4 factories of the printed circuit board emit 59.50 ton-VOCs/year. Thus, it can be found that the optronics industry contributes the largest VOCs emission rate among the three electronic industries. After January 1, 2003, the regulation of the emission rate of the optronics industry will become valid. In the mean time, the E factory of the optronics industry will be able to be expected to provide about the reduction rate of 758 ton-VOCs/year. Thus, it can also be anticipated furthermore that due to the regulation of the air pollution control for the optronics industry becomes valid since January 1, 2003, the air quality of the whole Taiwan area will also be improved significantly. The results evaluated respectively by the rules of the 5 countries can finally be compared among the 5 countries. The following conclusions can then be found : (1) Except R.O.C. and United States, the other 3 countries (Japan, Netherlands, and Mainland China) will not have had the special regulations of the pollution control of the VOCs emission rate of the semi-conductor industry. In these 3 countries, the regulations of the single emission standard for all industries are employed to monitor the process operation of their semi-conductor industry. (2) The reduction rate of the regulation of the semi-conductor industry is 90% for both the United States and R.O.C.. But, in R.O.C., the maximum VOCs emission rate of the regulation of the semi-conductor industry is 0.6 kg/hr which is about six times of 0.095 kg/hr of U.S. regulation. It means that the maximum VOCs emission rate of the R.O.C. regulation of the semi-conductor industry should be able to be corrected up if the best achieved control technology (BACT) may be imported and employed in R.O.C.. (3) In this study, both the reduction rate and the emission rate of the only one semi-conductor factory are up to the standard of all regulations of the 5 countries. But, for both the optronics and the printed circuit board industries satisfying our regulation of the emission standard of stationary pollution sources, the VOCs emission rates can almost not pass the examinations of the regulations of the other 4 countries. (4) For the three electronic industries in this study, there two unreasonable facts about the R.O.C. regulations must be presented in the following : (a) There have different trichloroethylene emission standards between the semi-conductor and the printed circuit board industries. (b) For the regulation of the R.O.C. semi-conductor industry, the effective measurement ratio for every season must be larger than 80%. It indicates that the other 20% invalid measurement ratio is accepted by the present regulation. (5) Based on the above results of (3) and (4), it means that the more rigorous regulations for both the optronics and the printed circuit board industries are respectively and urgently required to be constructed to improve the air quality of Taiwan.
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