MadSci Network: Chemistry

Re: what resins can remove excess fluoride from the water ?

Date: Mon Oct 18 11:18:44 1999
Posted By: Mark Murphy, Staff, Environmental Science Division, Texas Institute for Applied Environmental Research
Area of science: Chemistry
ID: 940084659.Ch

A strong base anion exchange resin, or a mixed cation/anion resin should do 
the trick.  Fluoride is second to sulfate as the least selective anion 
removed by such resins, however.  I operated water treatment systems at a 
nuclear plant.  We took hard lake water and made ultra-pure, fluoride-free 
(<0.1Umho/cm)water from it by a series of pretreatment flocculants, sand 
and carbon filters, reverse osmosis, degassifiers, then through trains of 
demineralizers with cation, anion and mixed bed resins.  We used Dowex 
resin, which is a styrene gel bead type using a quaternary amine or 
sulfonic acid functional group.  The cation and anion resins were 
regenerated by sulfuric acid and sodium hydroxide, respectively.  Depending 
on the amount of water and the size of your operation, you might look to 
Dow Chemical or to a simple scientific supply catalog such as Fisher.
More on resins may be found at:

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