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《Environmental Science & Technology》 2017-S2
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N-Nitrosodimethylamine Byproducts Formation During Ozonation

LIAO Xiaobin;ZOU Rusen;YUAN Baoling;Institute of Municipal and Environmental Engineering, College of Civil Engineering,Huaqiao University;  
N-Nitrosodimethylamine(NDMA) is a new disinfection byproduct that has been found in chlorinated/chloraminated drinking waters, it attracts widespread concern due to the carcinogenic characteristic of NDMA. However, the formation of NDMA has also been found in the ozonation process, which might bring a challenge to the application of ozone and pose a great threat to the subsequent disinfection process. This paper summarized the occurrence, precursors, influencing factors as well as formation mechanisms of NDMA formation during ozonation. The formation of NDMA during ozonation at home and abroad was reviewed at first. Then the specific structures of precursors that react with ozone and generate NDMA easily were introduced. Factors(ozone dosages, p H and bromide ion) that affected NDMA formation in ozonation process were summa-rized and three NDMA formation mechanisms during ozonation, including: catalytic nitrosation of formaldehyde, N_2O_4 nitrification, indirect oxidation via unsym-dimethylhydrazine(UDMH) pathway, were discussed with emphasis. Finally, future re-search directions for NDMA formation during ozonation were prospected.
【Fund】: 国家自然基金青年项目(51508209);; 中国博士后基金特别资助(2016T90595);中国博士后基金面上项目(一等)(2015M580561);; 福建省自然科学基金(2015J05102)
【CateGory Index】: TU991.2
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