[Efficiency of photodecomposition of trace NDMA in water by UV irradiation].
Efficiency of photodecomposition of trace NDMA by UV irradiation was investigated with analyzing the initial concentration of NDMA, solution pH, irradiation area, irradiation intensity and water quality effect on NDMA photolysis. NDMA could be effectively photodegraded by UV irradiation. The removal efficiency of NDMA was 97.5% after 5 min of UV irradiation. Effect of initial NDMA concentration on photodecomposition of NDMA was not remarkable. With pH value ascending, the removal rate of NDMA photodecomposition decreased. The yields of photoquantum were more under lower solution pH than that under higher pH. NDMA had fastest reaction rate at solution pH = 2.2. Removal efficiency of NDMA increased with the available irradiation area ascending. Increscent ultraviolet irradiation intensity was good for NDMA degradation. Water quality affected the removal of NDMA slightly. The removal efficiency of NDMA in tap water and Songhua River raw water were 96.7% and 94.8%, respectively.
Xu
Bing-Bing
BB
School of Municipal and Environmental Engineering, Harbin Institute of Technology, Harbin 150090, China. xbb_hit@126.com
Chen
Zhong-Lin
ZL
Qi
Fei
F
Ma
Jun
J
D004128:Dimethylnitrosamine / Q000737:chemistry*; D010777:Photochemistry; D010782:Photolysis / Q000528:radiation effects*; D014466:Ultraviolet Rays; D014874:Water Pollutants, Chemical / Q000737:chemistry*; D018508:Water Purification / Q000379:methods
D014874:Water Pollutants, Chemical; D004128:Dimethylnitrosamine