In conventional treatment plants, chlorine dioxide (active ingredient in AM) used for oxidation is fed either in the
raw water, in the sedimentation basins, or following sedimentation. To limit the oxidant
demand, and therefore chlorine dioxide dose and the formation of chlorite, it is common
to add chlorine dioxide following sedimentation. Concerns about possible taste and odor
complaints have limited the use of chlorine dioxide to provide a disinfectant residual in
the distribution system. Consequently, public water suppliers that are considering the
use of chlorine dioxide for oxidation and primary disinfectant applications may want to
consider chloramines for secondary disinfection.