给水管网硝化作用控制方法研究进展

介绍了氯胺消毒管网中的硝化作用及其控制方法,并对控制方法进行了总结和展望。在采用氯胺消毒的给水管网中,存在着硝化反应发生的可能性。硝化作用会造成出水亚硝酸盐含量升高、消毒剂含量降低、异养菌繁殖等危害。国内外对氯胺消毒管网中硝化作用控制方法的研究主要集中在改变出厂水水质条件-pH、提高消毒剂的浓度、优化氯胺投加方式、管道冲洗、硝化潜能曲线及投加亚氯酸根控制硝化作用。目前以上的控制方法对硝化作用起到了一定的抑制作用,但是存在控制效果不确定、不具有长期性或者增加生成消毒副产物的风险。因此,对硝化作用的控制方法有待深入研究。笔者提出了氯胺、二氧化氯联合消毒控制硝化作用的方法。

CONTROLLING METHOD FOR NITIFICATION IN CHLORAMINATED DRINKING WATER DISTRIBUTION SYSTEM

Nitrification in chloraminated drinking water distribution system and controlling methods were introduced.The potential of nitrification occurrence increased in chloraminated drinking water distribution system.Nitrification will result in the production of nitrite,the loss of disinfectant residual,propagation of heterotrophic bacteria in chloraminated drinking water distribution system.The controlling method on nitrification mainly increasing pH level,disinfectant residual,breakpoint chlorination,distribution system cleaning,nitrification potential curve and dosing chlorite.However,the effectiveness of these strategies for control of nitrification was found to be not a long-term strategy and maybe increased level of disinfectant by-product.It is necessary to do some further research on control nitrification in drinking water distribution system.