Lee Jeong-Yub, Pearson Carrie R, Hozalski Raymond M, Arnold William A
Department of Civil Engineering, University of Minnesota, Minneapolis, MN 55455-0116, USA.
Water Res. 2008 Apr;42(8-9):2043-50. doi: 10.1016/j.watres.2007.12.012. Epub 2007 Dec 23.
Halogenated disinfection byproducts (DBPs) may undergo reduction reactions at the corroded pipe wall in drinking water distribution systems consisting of cast or ductile iron pipe. Iron pipe corrosion products were obtained from several locations within two drinking water distribution systems. Crystalline-phase composition of freeze-dried corrosion solids was analyzed using X-ray diffraction, and ferrous and ferric iron contents were determined via multiple extraction methods. Batch experiments demonstrated that trichloronitromethane (TCNM), a non-regulated DBP, is rapidly reduced in the presence of pipe corrosion solids and that dissolved oxygen (DO) slows the reaction. The water-soluble iron content of the pipe solids is the best predictor of TCNM reaction rate constant. These results indicate that highly reactive DBPs that are able to compete with oxygen and residual disinfectant for ferrous iron may be attenuated via abiotic reduction in drinking water distribution systems.
在由铸铁或球墨铸铁管组成的饮用水分配系统中，卤代消毒副产物（DBPs）可能会在腐蚀的管壁上发生还原反应。从两个饮用水分配系统的多个位置获取了铁管腐蚀产物。使用X射线衍射分析了冻干腐蚀固体的晶相组成，并通过多种萃取方法测定了亚铁和铁的含量。批次实验表明，一种不受监管的消毒副产物三氯硝基甲烷（TCNM）在存在管道腐蚀固体的情况下会迅速还原，并且溶解氧（DO）会减缓反应。管道固体中的水溶性铁含量是TCNM反应速率常数的最佳预测指标。这些结果表明，能够与氧气和残留消毒剂竞争亚铁的高反应性消毒副产物可能会在饮用水分配系统中通过非生物还原而衰减。
