removal of flouride 1

[looksatstars]

We have a water well for drinking water that has a high flouride. Does anyone know of a reasonable, economical way of getting rid of the excess flouride. The water is pumped from the well directly to standpipes in a campground.

 

[bimr]

The answer depends on how much you have to spend, the flow rate, the fluoride concentration, and the water analysis. You have not provided any of this information.

The best technologies are reverse osmosis and distillation. These processes will remove 90%+ of the fluoride but will be expensive. If you do not want the expense of a distillation or a reverse osmosis system, you can try a filter with a cartridge containing activated alumina.

Activated alumina cartridges are relatively expensive and have a short like, but they do work.

 

[cub3bead]

Asahi also makes an ion exchange resin specific for fluoride. The semiconductor guys use it to remove fluoride from the chip rinse water after etching.

 

[shahyar]

I believe, the cheapest way is adding lime:
Ca2+ + F- --> CaF2(precipitates).

Hope this help

 

[shahyar]

Try this:

http://www.ruf.rice.edu/~dustin/SPWCCpaper3.pdf

 

[Muggle]

Looksatstars - can you provide an idea of the flow rate and/or daily demand? Elecrolytic oxidation will precipitate flouride out the water - regardless of level - systems can be designed for batch treatment or flow-through. The precipitate can be captured using periodic bag, cartridge, or DE filtration - too small for centrifuges - though Amiad's new 3-micron may work - or filtered on the way out under pressure. Figure 10kWh max for flows from 10-150gpm, depending on initial fluoride level.
Dave/Aquatic Technologies