How can mercury and other heavy metals be removed from the flue gas?

Injecting activated carbon into the flue gas is an effective method for the removal of mercury and other heavy metals. The process utilizes the adsorptive properties of activated carbon, which has a very high surface area and porosity, allowing it to capture a wide range of contaminants, including heavy metals. When activated carbon is introduced into the flue gas stream, it binds with these pollutants, making it easier to separate them from the gas before it is released into the atmosphere.

This method is particularly advantageous because it can be used in various types of combustion systems and is effective at relatively low concentrations of heavy metals, ensuring a reduction in emissions and compliance with environmental regulations. Additionally, it can be implemented in combination with other technologies to enhance overall removal efficiency.

Although high-efficiency filters can remove particulate matter, they may not effectively capture the gaseous forms of mercury and heavy metals. Catalytic converters are primarily designed for limiting nitrogen oxides and can assist in reducing some forms of heavy metals, but they are not as efficient as activated carbon for mercury removal. Injecting water vapor, while it might help in cooling the flue gas or other processes, does not specifically target the removal of heavy metals.