This powerpoint presentation presents the fate of chlorinated disinfection byproducts (DBPs) indoors based on a
robust database. Data for DBP fate was generated through three-year field and experimental studies conducted on
drinking water originating from various distribution systems in the Quebec City region of Canada. The data comprises
field studies conducted under "real conditions" in various residences to evaluate DBP fate following heating, boiling, point-of-use
(POU) filtering and refrigeration, as well as the effect of daytime and night-time stagnation of water in cold water pipes
and hot water tanks. Experimental studies conducted in controlled conditions focused on water filtered by POU
devices and stagnation in copper and plastic plumbing. Both field and experimental studies were repeated to obtain
monthly patterns of DBP fate indoors. Results demonstrated that all types of manipulation of water have effects on
chlorinated DBPs: boiling and refrigerating have a considerable impact on trihalomethanes (THMs), but not on haloacetic acids (HAAs); POU filtering
affects both THMs and HAAs significantly, but the effects change according to the "age" of the filter; THM levels
increase much more than HAAs when cold water stagnates for various hours in the plumbing; stagnation in plastic pipes
has less impact on chlorinated DBPs than stagnation in copper pipes; copper release during stagnation of cold water is
high and can be associated with DBP fate; and, transit in the hot water tank has a huge impact on both THM and HAA
levels, much more so than the impact of long stagnation of cold water in the plumbing. The presentation also discusses
the variability of DBP fate according to the type of "reference water" (municipal distribution system), specific THM and
HAAs species (brominated and non-brominated) and seasonal conditions (i.e. the initial temperature and water quality of
"reference water"). The implications concerning public health protection and exposure assessment in epidemiological
studies are also discussed, and specific recommendations are presented for handling tap water indoors to reduce
DBP exposure in tap water. Includes figures.
| Edition : | Vol. - No. |
| File Size : | 1
file
, 1.6 MB |
| Note : | This product is unavailable in Ukraine, Russia, Belarus |
| Number of Pages : | 34 |
| Published : | 11/01/2009 |
