Mercury (Hg) is one of the most important environmental
contaminants that has aroused a global concern due to its
toxicity, long range transport, persistence and bioaccumulation
in the environment. Coal combustion is believed to be
the main source of mercury emissions to the atmosphere, accounting
for 60%, or even more, of the total mercury emissions
(Pacyna et al., 2006). Streets et al. (2009) suggested
that the change of global anthropogenic Hg emissions may
range anywhere from −4% to +96% by 2050, depending on
future implementation of best available technology (BAT) in
coal-fired utilities and energy demand.