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Health Effects of Fine Particles Emitted from Coal-Fired Power Plants

机译：燃煤电厂排放的细颗粒物对健康的影响

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Coal-fired power plants, through their emissions of considerable quantities of sulfur and nitrogen oxides gases, contribute to the large portion of secondary particles in the air. Fine particles are important from a health effects standpoint because of their potential toxicity and their capacity for penetration into all regions of the human respiratory system. Of primary importance for fine particles is a definite facility for entering the deep recesses of the lung where the probability of adverse effects is greater because of longer retention times. Some investigators have concluded that particulate emissions appear to play a larger role in health effects than do gaseous emissions. Some trace elements, most of which are in particulate form, are proven carcinogens based on experimental and epidemiological evidence. Also of importance is the concentration of the particle to which an individual is exposed. Unfortunately, these various relationships have not been quantified completely. Little data exist to determine the overall impact of TVA's coal-fired plants on the fine particle problem. Although TVA is either in compliance or in the process of complying with all applicable particulate, sulfur oxide, and nitrogen oxide regulations but because remaining amounts of sulfur and nitrogen oxide emissions are relatively large, the impact still could be judged to be significant. Fine particles and their precursor gases are not efficiently removed from stack gas effluents by conventional control systems. As a result of technology developments, high performance electrostatic precipitators and baghouses for controlling fine particles are being applied more effectively at large coal-burning installations. (ERA citation 07:044840)

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