There are many
ways to treat arsenic but most rely on converting all of the arsenic
to a valence of +5 (some will be +3) which is easier to remove.
The technologies for removal include adsorption on alumina, reverse
osmosis membrane separation, ion exchange, or lime softening.
Alumina may have a problem with progressive loss of capacity and
may be suitable for only a few cycles.
oxidize any trivalent arsenic with peroxide, permanganate, ultraviolet
light, or other oxidizer followed by precipitation, filtration,
etc. as above. UV light and titanium oxide have improved oxidization
efficiencies for other compounds but I haven't seen any data on
The following links
will take you to sites that review the basic treatment technologies.
Each source (your water) should be analyzed and specific treatments
tested before you invest in a system.
Literature on the Web
Click on the highlighted
web address to go to the web page listed. Hit back on your browser
(right click mouse) to get back here if you want more.