燃煤电厂是主要的人为汞排放源之一,占人为排放的三分之一[1,2]。汞在燃煤电厂以3种形态存在:零价汞(Hg0)、氧化态汞(Hg2+)和颗粒态汞(Hgp),零价汞不能溶于水,很难脱除;颗粒态汞一般经过静电除尘器(ESP)除去[3];Hg2+能溶于水,通过湿法脱硫装置(WetFGD)既能脱SO2又能脱除Hg2+。2005年3月,美国 Coal-fired power plants are one of the major anthropogenic mercury sources, accounting for one-third of anthropogenic emissions [1,2]. Mercury in coal-fired power plants exist in three forms: zero-valent mercury (Hg0), oxidized mercury (Hg2 +), and particulate mercury (Hgp). Zero-valent mercury is insoluble in water and is difficult to remove; particulate mercury generally passes Electrostatic precipitator (ESP) to remove [3]; Hg2 + can dissolve in water, through the wet FGD (WetFGD) both SO2 removal and Hg2 + removal. March 2005, United States