MercSelAs or MSA for Hg Re-emission? Oh yes. It does that, too.
When MSA is added to the WFGD recirculation tank, it provides not just selenium wastewater outfall reductions, but Hg re-emission elimination. Coupled-control, if you will, since customers who currently use additives for “Hg re-emission”, can discontinue its use.
There are numerous suppliers of chemical additives for the control of “Hg re-emission”. MSA can replace them all. And, since MSA is delivered as a solid, and is a chemical intermediary, the cost is quite favorable.
Why spend extra for a Hg re-emission additive that is a polysulfide, or an organic sulfide, when a simple sulfide works just as well? You need ~1 ppb in the flue gas exiting the WFGD, not 30 ng/L in the wastewater outfall. Why do you need a polysulfide for Hg re-emission? Why do you need an organic sulfide for Hg re-emission? Why not a simple sulfide, such as MSA?
Another benefit of using MercSelAs, MSA.