A coal-fired power plant is one of the largest anthropogenic mercury emission sources. While existing air pollution control devices can additionally control mercury with air pollutants, it is not easy to remove mercury to the desired level with high efficiency. Therefore, the adsorbent injection method for injecting an activated carbon to upstream of the particle control devices is widely used as an additional mercury control technique. Many studies have been carried out to investigate the factors affecting the mercury adsorption of activated carbon. Properties of activated carbon such as specific surface area and pore volume have been found to influence its mercury adsorption efficiency. Sulfur dioxide (SO2), nitrogen monoxide (NO), and hydrogen chloride (HCI) have an influence on the performance of activated carbon on mercury adsorption. A lab-scale fixed-bed system has been widely used for the mercury adsorption test of activated carbon. In this study, activated carbons were prepared with different specific surface area and pore volume. Various conditions were applied to fixed-bed tests to examine the performance of activated carbon on mercury adsorption. Mercury speciation were conducted, and the mercury oxidation and adsorption efficiencies of activated carbon were determined.
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