Research has also been conducted on
evaluating activated carbon for removal of
chlorite and chlorate. Another objective
of Sources, Occurrence, and Control of
Chlorine Dioxide By-Product Residuals
in Drinking Water was to evaluate PAC as
a potential chlorite control technique. This
study found that chlorite can be controlled
by PAC, but the required dosages may be
higher than is practical if PAC is used only
for that purpose. This study also found that
chlorite can be removed by GAC, but that
breakthrough may occur early.
In the last four decades and since the
discovery of THMs, much knowledge has
been gained on most aspects of the science
of regulated DBPs. Based on this knowledge,
drinking water utilities now have the ability
to provide their customers with water that
meets existing regulations.
However, more work needs to be done.
As water demand increases because of
population growth, water purveyors are
resorting to alternative source waters such
as recycled water or sea water that exhibit
different water matrix characteristics and
requires different operating conditions. For
example, higher levels of bromide and iodide
and low TOC in seawater may favor the
formation of brominated DBPs and possibly
iodinated DBPs. Recent reports have linked
a shift in speciation and concentration
of certain regulated DBPs (THMs and
HAAs) to climate change and its effects on
drinking water sources (i.e., increased algal
growth). The objective of a recently awarded
project #4302, “Climate Change Impacts
on Lake Erie Disinfection Byproduct
Formation,” is to gain a better understanding
of the relationships between Lake Erie algal
population, DOM, and DBP formation. This
work will document how water quality
changes potentially linked to climate change
can impact treated drinking water quality and
help better prepare water agencies to adapt to
climate change so that they may continue to
provide high quality water.
McGuire, M.J. and R.G. Meadow. (1988).
“AWWARF Trihalomethane Survey.” JAWWA.
80 ( 1). Pp 61-68.