Degradation of N-Nitrosodimethylamine by Mercury-Free Excimer UV Lamps

作者：Sakai Hiroshi^*; Kosaka Koji; Takizawa Satoshi

来源：Environmental Engineering Science, 2016, 33(5): 341-346.

DOI：10.1089/ees.2015.0328

• mercury
• Minamata disease
• natural organic matter
• nitrate
• nitrite

N-nitrosodimethylamine (NDMA) is a potent carcinogen, which is degraded by KrCl or xenon-fluorescent excimer lamps. Degradation rates using these lamps were found to be 10.8cm(2)/J using a KrCl lamp and 4.2cm(2)/J using a xenon-fluorescent excimer lamp. These values were significantly higher than the 2.3cm(2)/J found using mercury ultra violet (UV) lamps as previously reported by Sharpless and Linden (2003). The impact of the water matrix was investigated using natural organic matter (NOM) and nitrate as representative water contaminants. Degradation efficiency of both lamps was reduced by the presence of NOM or nitrate, with degree of reduction less for the xenon-fluorescent lamp, indicating that this lamp performs more stably in varying water matrices. Generation of nitrite by-products was also investigated. Nitrite generation was almost half under the xenon lamp compared to the excimer lamp at the same UV fluence. It was found that the xenon-fluorescent lamp was more suitable than the KrCl lamp for NDMA degradation in practical applications.

• 出版日期2016-5