Several factors must be considered in the design
of a perchlorate removal system and, as always,
the source water characteristics are the central
point for determining a solution. Conventional
Type 1 strong base anion exchangers have demonstrated
sufficient selectivity for perchlorate to make
a non-regenerable, or once-use process technically
viable for perchlorate removal. In order to improve
the economics of this approach, a nitrate selective
resin, such as Amberlite™ PWA5 was also investigated
and found to have a further increase in perchlorate
selectivity. This improved the perchlorate loading
capacity of the resin, especially when significant
amounts of sulfate were present in the water.
However perchlorate selectivity is still relatively
low versus nitrate, which may be problematic in
some cases.
A new anion exchange resin,
AMBERLITE™ PWA2, has recently been developed to
specifically meet the need for a resin with high
selectivity for perchlorate, even in the presence
of nitrate. This new resin provides the capability
to economically employ a simple non-regenerable
treatment approach, on a wide range of water compositions.
Amberlite™ PWA2 selectively removes
more perchlorate than any other commercially available
ion exchange resin product.
|
 |
