Xu Bing-Bing, Chen Zhong-Lin, Qi Fei, Ma Jun
School of Municipal and Environmental Engineering, Harbin Institute of Technology, Harbin 150090, China.
Huan Jing Ke Xue. 2008 Jul;29(7):1908-13.
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.
通过分析N-二甲基亚硝胺（NDMA）的初始浓度、溶液pH值、照射面积、照射强度和水质对NDMA光解的影响，研究了紫外线照射对痕量NDMA光分解的效率。NDMA可通过紫外线照射有效地光降解。紫外线照射5分钟后，NDMA的去除效率为97.5%。初始NDMA浓度对NDMA光分解的影响不显著。随着pH值的升高，NDMA光分解的去除率降低。较低溶液pH值下的光量子产率高于较高pH值下的光量子产率。NDMA在溶液pH = 2.2时反应速率最快。NDMA的去除效率随着有效照射面积的增加而提高。紫外线照射强度的增加有利于NDMA的降解。水质对NDMA的去除影响较小。自来水中NDMA的去除效率和松花江水原水中NDMA的去除效率分别为96.7%和94.8%。
