Formation, detection and removal of n-nitrosodimethylamine in drinking water treatment process

ENVR 277

An Li1, Zhonglin Chen1, Lei Yang1, Bingbing Xu1, and Shizhong Yin, ann_04@126.com2. (1) School of Municipal and Environmental Engineering, Harbin Institute of Technology, Harbin, 150090, China, (2) Northeast Electric Power Design Institute, Changchun 130000, China
n-Nitrosodimethylamine (NDMA) is known as a carcinogenic and mutagenic compound and, in recent years, it has been found to be a novel disinfection by-product of the chloramination process. The NDMA precursors are considered as dimethylamine (DMA) and tertiary amines with dimethylamine functional groups. There are two pathways to NDMA formation: nitrosation and UDMH oxidation. Formation of NDMA is affected by the presence of free chlorine and bromide and pH is also a sensitive fator. Now the detection and analytical methods of NDMA are usually spectrophotometry, thin-layer chromatography, GC, LC and GC/MS. To improve the detection precision, GC/MS/MS and GC/HRMS are applied in detecting the trace NDMA. The methods of NDMA removal are UV degradation, the Ambersorb572 (a kind of resin) and several types of zeolite(NaY, NaZSM-5, NaA) adsorption, ozone, UV/ozone and UV/hydrogen peroxide advanced oxidation technologies. Ozone also can oxidate NDMA percursors, so it can control the NDMA yield indirectly.
 

Advances in Drinking Water Disinfection and Disinfection Byproduct Management
6:00 PM-8:00 PM, Wednesday, April 9, 2008 Morial Convention Center -- Hall A, Poster

Division of Environmental Chemistry

The 235th ACS National Meeting, New Orleans, LA, April 6-10, 2008