Ferric Chloride vs Ferric Sulfate Coagulants
Ferric Chloride vs Ferric Sulfate Coagulants
(OP)
What is the difference between ferric chloride and ferric sulfate with respect TOC removal, handling, sludge production, effective pH range,...? I have a client who is looking into switching coagulants from aluminum sulfate to either of the ferrics for increase TOC removal.
Any lessons learned from switching from alum to ferric?
Thank you for your help.
Any lessons learned from switching from alum to ferric?
Thank you for your help.





RE: Ferric Chloride vs Ferric Sulfate Coagulants
Both are available as a liquid in tote bins which I prefer from a handling stand point. Ferrifloc is dry ferric sulfate but I have had difficulty making it dissolve.
From a corrosion view ferric sulfate wins because it not as aggressive ferric chloride.
RE: Ferric Chloride vs Ferric Sulfate Coagulants
Consider using ferrous sulfate (aka copperas). It is very cheap, (probably) more soluble than ferric, and you can aerate to ferric. The ferrous may also catalyze oxidation reactions, as with Fenton's reagent, and the process may already include aeration steps for oxidizing organics.
RE: Ferric Chloride vs Ferric Sulfate Coagulants