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Ted Mooney, P.E. RET
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for Metal Finishing 1989-2025
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ferric chloride use in waste treatment
Q. I began to use ferric chloride ⇦ this on eBay or Amazon [affil links] in my waste water treatment process where I treat for zinc, nickel, copper, chrome, and cyanide. The ferric chloride ⇦ this on eBay or Amazon [affil links] is used as settling agent. I been told that the ferric chloride ⇦ this on eBay or Amazon [affil links] will interfere when testing for cyanide levels in the final discharge stream. Could this be true?
Karl Weyermann- Winston-Salem, North Carolina
December 15, 2011
It's really more of a coagulant. Whether it's the best thing to use depends on your waste. I always had better luck with ferrous sulfate
⇦ this on
eBay or
Amazon [affil links] .
FeCl3 addition will have no effect on the cyanide analysis, if it is being done properly.
Dave Wichern
Consultant - The Bronx, New York
December 16, 2011
Ferric should work but I prefer ferrous sulfate ⇦ this on eBay or Amazon [affil links] and it has been used for years for cyanide destruction, but as mentioned earlier it depends on your water. I know that iron can give false chrome readings in some testing but I have never heard of this with cyanide. If this is a stream that has elevated chrome I would not rule it out.
Brian Wodetzki- Valparaiso, Indiana, USA
December 24, 2011
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