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Recent research has suggested that certain nitrogenous (N)-disinfection byproducts (DBPs) (e.g., HANs) andcertain non-regulated carbonaceous (C)-DBPs (e.g., HAs) may be of higher health concern thanthe regulated C-DBPs (e.g., THMs, HAAs). The U.S. Environmental ProtectionAgency's (USEPA's) Integrated Risk Information System (IRIS) database indicates that for eightnitrosamines (including NDMA) drinking water concentrations in the low ng/L level areassociated with a 10-6 lifetime cancer risk. EfOM and AOM are sources of disinfection byproduct (DBP) precursors,especially for N-DBPs. Thus, a survey was conducted to look at N-DBP formation and that ofselected C-DBPs at 16 DWTPs, with a focus on wastewater and algal impacted drinking watersupplies.The authors conducted a full-scale survey of 16 U.S. drinking water treatment plants (DWTPs) in 2006 and/or 2007. Someof the sites were sampled during an algal bloom event. In terms of the effluent-impacted sites,they were sampled in the summer when river flow was low, as some streams can be moreeffluent-impacted at this time of year. In some watersheds, a DWTP that was not algal orwastewater impacted was sampled to provide a contrast. DWTPs were sampled that used a rangeof treatment processes (coagulation, lime softening, ultrafiltration, filtration with granularactivated carbon) and disinfectants (chlorine, chlorine dioxide, chloramines, ozone, ultraviolet). The paper provides analytical parameters. Includes 28 references, tables, figures.

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Edition: Vol. - No. Published: 11/01/2008 Number of Pages: 11File Size: 1 file , 790 KB