二氧化氯消毒处理含溴离子水防止溴酸盐产生的研究

Zero Bromate Formation in Water Treatment Containing Bromide Ions with ClO_2 Disinfection

该文从消毒过程中涉及到的氧化还原反应的电极电势出发,借助元素电势图以及半反应的pH-电势图,发现当处理水pH为7时,二氧化氯还原为亚氯酸根的电极电势为0.95 V,低于溴离子被氧化成溴酸盐的电极电势(1.03 V),从而在理论上解释了用二氧化氯消毒处理饮用水时,即使在处理水中含有溴离子的情况下,也不会形成溴酸盐,该结论也得到了实验数据的支持。

Based on the electrochemical redox potential for the RO reactions in the processes of disinfection, with the help of element potential diagrams and the Pourbaix （pH/potential） diagram, it was found that the potential of chlorine dioxide（0.95 V）, reduced to chlorite, is lower than the potential （ 1.03 V） of bromonium ions oxidized to hromate, when the pH is 7. So, even if the drinking water which to be treated containing bromide, no bromate able to be produced using chlorine dioxide as disinfectant. The conclusion has also been proved by the experimental results.