The proposal concerning fly ash had been amended to now include FGD gypsum.

In general, removal efficiency of FGD installations for mercury ranges from 30 to 50%.

There are two major types of FGD systems: wet and dry.

The application of flue gas desulfurization (FGD) has a very important impact on removal of not only sulfur dioxide but also mercury.

Higher Hg emission control efficiencies, exceeding 95 %, can be obtained through a combination of FGD and ESP's with “add on” type of equipment including sorbent injection.

Major thermal non-ferrous metal smelters in developed countries employ ESPs and FGDs, working with efficiencies comparable with those for noted for energy production.

The greatest removal efficiencies with existing technology can be expected when a wet FGD system is installed downstream of a fabric filter (31).

In 2005, the following critical activities under the Sub-committee on Training and Capability-Building were conducted: 1) conduct of focus group discussions (FGDs), 2) development of the module for Gender Sensitivity Trainings (GST), and 3) conduct of GST.

The annualized investment and operational costs for installations that are used to remove mercury, including ESPs, FFs, FGD, and “add on” measures just for mercury removal are presented in Table 1.

The annualized investment and operational costs for installations that are used to remove mercury, including ESPs, FFs, FGD, and “add on” measures just for mercury removal are presented in Table 5.