AWWA ACE71095

This powerpoint presentation begins by providing a brief overview of NDMA and other nitrosamines. A current study is presented by covering the following topics: EPSRC-funded, Sept 2007-Sept 2009 (extended to Feb 2010); six water treatment works, five United Kingdom water companies;lowland, upland, groundwater sources;chloraminated and chlorinated systems, amine-based coagulants;source waters with elevated N content and/or organic content;raw, filtered, disinfected, distributed water samples;seasonal sampling (four intervals in 2008, one in 2009);NDMA, NMEA, NDEA, NDPA, NDBA, NPYR, NPIP, NMOR;method - SPE + GC/MS; source water quality characterization; and, QA/QC comparison analysis by another university lab and by acertified commercial lab in the United Kingdom. Study summary and ongoing work indicates that:NDMA and other nitrosamines not detected in the vast majority of samples;first round of sampling (February 2008) exhibited higher nitrosaminelevels than in subsequent rounds - cause uncertain, not seen again inFebruary 2009 round; NDBA consistently above the MDL in one of the distribution systems; no consistent relationship between nitrosamine levels and contact time in the distribution network; no observed link between nitrosamine levels and source water characteristics or particular treatment processes;nitrosamine formation studies to be completed in the lab later this year -formation by various combinations of disinfectants (NH₄Cl, HOCl, UV, O₃)under different water quality conditions. Includes tables, figures.

Product Details

Edition:

Vol. - No.

Published:

11/01/2009

Number of Pages:

28

File Size:

1 file , 2 MB