Co-effects of sulfur dioxide load and oxidation air on mercury re-emission in forced-oxidation limestone flue gas desulfurization wet scrubber

► We investigated FGD Hg0 re-emission under full-scale operation conditions. ► Continuous Hg emission monitoring data and plant operation information were analyzed. ► Both oxidation air flow rate and sulfur load in FGD slurry showed significant effects. ► High Hg0 re-emission occurred when operating under unfavorable sulfur to air ratio. ► Adjusting oxidation air operation might be an economic approach in controlling Hg0 re-emission.