A Shock to the System A new, stricter arsenic rule is starting
to affect small and large water supplies On Jan. 23, 2006, the
arsenic rule was implemented with a new limit of 10 parts per
billion (ppb) (the old standard was 50 ppb). The new rule has a
broad reach; it affects large and small drinking water treatment
systems, including non-community water supplies. While a number
of different arsenic removal methods are available, facilities
must consider evaluation criteria, such as installed and
operating costs, operation complexity, waste volume and type,
and interaction with competing contaminants. To date, single-use
adsorption media and iron co-precipitation are two of the most
common removal processes installed. Single-use adsorption media
and co-precipitation are cost-effective and easy-to-operate
arsenic removal methods. Moreover, the two treatment methods can
benefit both small and large systems. Single-use Adsorption
Media Removal Single-use adsorption media was developed partly
to address lower Euro