[Effect on iron release in drinking water distribution systems].
Batch-scale experiments were done to quantitatively study the effect of inorganic chemical parameters on iron release in drinking water distribution systems. The parameters include acid-base condition, oxidation-reduction condition, and neutral ion condition. It was found that the iron release rate decreased with pH, alkalinity, the concentration of dissolved oxygen increasing, and the iron release rate increased with the concentration of chloride increasing. The theoretical critical formula of iron release rate was elucidated. According to the formula, the necessary condition for controlling iron release is that pH is above 7.6, the concentration of alkalinity and dissolved oxygen is more than 150 mg/L and 2 mg/L, and the concentration of chloride is less than 150 mg/L of distributed water.
Niu
Zhang-bin
ZB
Department of Environment Science and Technology, Tsinghua University, Beijing 100084, China. nzb03@mails.tsinghua.edu.cn
Wang
Yang
Y
Zhang
Xiao-jian
XJ
Chen
Chao
C
Wang
Sheng-hui
SH
D002712:Chlorides / Q000032:analysis; D006863:Hydrogen-Ion Concentration; D007501:Iron / Q000032:analysis*; D010084:Oxidation-Reduction; D010100:Oxygen / Q000032:analysis; D014874:Water Pollutants, Chemical / Q000032:analysis*; D014881:Water Supply / Q000032:analysis*
D002712:Chlorides; D014874:Water Pollutants, Chemical; D007501:Iron; D010100:Oxygen