Abstract
Flue gas from coal-fired power stations is an important source of mercury pollution. A diffusion electrochemical reactor is proposed to remove elemental mercury (Hg0) from such gas. Experiments were carried out in a noncompartmentalized column reactor with a stainless-steel mesh cathode and foam titanium anode. When the simulated gas passes through the foam titanium, Hg0 is oxidized. In the electrochemical process, Hg0 first diffuses to the gas–liquid–solid three-phase interface, and the oxidized state (Hg2+) of Hg0 enters the liquid phase after loss of electrons in the anode (solid phase). Operation at voltage of 3 V could achieve removal efficiency of 90 %. The effects of voltage, temperature, flow rate, electrolyte concentration, pH, initial concentration, and other conditions were investigated. The results show that electrochemical oxidation technology is a promising method for Hg0 emission control in flue gas from coal-fired power stations.
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