城市饮用水原水中亚硝酸盐的转化与控制  

Conversion and control of nitrite in raw water in urban waterworks

作　　者：黄廷林[1] 廖亮[1] 

机构地区：[1]西安建筑科技大学西部建筑科技国家重点实验室培育基地,陕西西安710055

出　　处：《供水技术》2009年第1期12-15,共4页Water Technology

基　　金：国家自然科学基金重点项目资助(50830303)

摘　　要：由于水源水水质的污染和氨氮含量的升高,水质净化或输水过程中亚硝酸盐浓度的升高已成为饮用水水质安全所关注的重要问题之一。针对某地下水源高氨氮浓度期间输水管道中存在的亚硝酸盐污染问题,研究了氯消毒工艺对亚硝酸盐转化的影响及其控制条件,对输水管道中的硝化反应过程进行了检验和分析,细菌鉴定结果表明,管道中亚硝化细菌的数量远高于硝化细菌,是造成管道中亚硝酸盐积累的主要原因;适宜的水温和pH值条件,以及较高的氨氮和较低的余氯浓度是促进水中亚硝化细菌生长与活性提高的主要因素;在水厂现行工艺条件下,提高预加氯量是解决亚硝酸盐问题的有效途径。实验条件下,加氯量为2～4mg/L时就可以有效控制亚硝酸盐的转化。The increasing of ammonia content and nitrite concentration in water purification or delivery process becomes a focus in drinking water safety as a result of source water pollution. The effects of chlorine disinfection on nitrite conversion and disinfection controlling conditions were studied by experiments to solve the problem of nitrite pollution in water distribution pipelines during the high ammonia period of certain underground water source. The nitration in pipelines were tested and analyzed at the same time. The results of bacteria identification showed that the amount of nitrite bacteria was much more than that of nitrate bacteria, causing the nitrite accumulation in pipelines. Proper water temperature, pH value, higher ammonia concentration and lower residual chlorine were the main factors of promoting nitrite bacteria growth and activity. Moreover, under current water treatment process increasing the dosage of preehlorination was an effective approach for nitrite pollution. And under experimental conditions, the nitrite transformation could be effectively controlled when the chlorine dosage was 2 -4 mg/L.

关 键 词：预加氯 亚硝酸盐 硝化作用 细菌鉴定 

分 类 号：TU991.2[建筑科学—市政工程]