Redox 5545 was injected into a forced oxidation wet FGD scrubber for a period of 30 days at 10 gallons per hour to evaluate the effect of stack mercury control and dissolved metals removal. The results showed:
The oxidation-reduction potential (ORP) is highly related to Hg re-emission in wet flue gas desulfurization (WFGD) systems in coal-fired power plants. An ORP in excess of +250 has shown to induce mercury re-emission. Redox’s products have been used in forced oxidation wet FGD units to control ORP resulting in lowering stack mercury (Hg) emissions.
An example of this would be a 1,300 MW station, burning bituminous coal, with a forced oxidation FGD unit that was experiencing mercury re-emission with an ORP of +650. The station injected 1 tote (300 gallons) of Redox 5545 into the absorber sump and within 15 minutes the ORP lowered to +200 with stack mercury lowering from 1.7 to 0.50 lbs./TBtu.
In the above referenced 30 day dissolved metals trial, the bromide concentrations were reduced by over 50% with a consistent injection of Redox 5545.