**Emission Control Technology**

Thanh-Dong Pham, Byeong-Kyu Lee, Chi-Hyeon Lee and Minh-Viet Nguyen

Additional information is available at the end of the chapter

http://dx.doi.org/10.5772/59722

## **1. Introduction**

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220 Current Air Quality Issues

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The chapter presents various promising methods to control air pollution emissions. Although several previously published books have examined this field [1-6], most of them presented only the methods to control air pollutants generated from stationary sources. These days, however, mobile sources are also important sources contributing to air pollution. Among the six air criteria pollutants listed by the United States Environmental Protection Agency (EPA), including CO, particulate matter (PM), SO2, NO2, O3, and Pb, mobile sources can contribute to 81% of all CO emissions, 37% of PM, 4% of SO2, 45% of NO2, 47% of volatile organic compounds (VOCs are precursors of O3, their estimate is a surrogate of the O3 concentration), and 72% of Pb [6]. Therefore, promising methods to control the emission of air pollutants generated from mobile sources should be included in the chapter to provide the readers with innovative ideas about the emission control of air pollution. Because of the variety of mobile sources and their mobility from one location to another, the methods applied to control the emission of air pollutants generated from stationary sources may not be useful for controlling air pollutants generated from mobile sources. Therefore, in this chapter, upstream control strategies, which try to control air pollutants from upstream emission processes, will be presented as promising methods to control the emission of air pollutants generated from mobile sources. Policies and regulations applying to control air pollutants emitted from transportation activities, agricul‐ tural activities, and construction fields will be presented as the main strategies to air pollution from upstream processes.

On the other hand, the chapter also presents downstream technologies to control air pollutants emitted from stationary sources. Based on the characteristics of target pollutants, the down‐ stream control technologies will be classified into two categories: particulate matter and gaseous pollutant control technologies. The technologies of cyclone, wet scrubber, electrostatic

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precipitators, and fabric filter will be introduced in the chapter as methods to control partic‐ ulate matter pollutants. To control gaseous pollutants, the chapter will present methods such as adsorption, absorption, condensation, incineration, applications of biological system, and photocatalyst. Each technology will be presented in detail from definition to principle and applications. The advantages and disadvantages of each technology will be described and compared in the chapter.
