氮化合物在饮用水管网中的分布变化规律研究

Research on Nitrogen Compounds Distribution and Variation in Drinking Water Distribution Networks

为了研究饮用水管网中氮化合物的分布变化规律,及其对细菌指标的影响,对我国北方某市配水管网中细菌总数、氨氮(NH4+-N)、硝酸盐氮(NO3--N)、亚硝酸盐氮(NO2--N)、自由余氯、浊度、总有机碳等水质指标进行了监测。结果表明:该管网微生物学水质较差。从管网入口到管网末梢,水中氨氮、亚硝酸盐氮浓度沿管网逐渐降低;氨氮与硝酸盐氮呈一定的负相关关系;氨氮与亚硝酸盐氮的变化趋势一致。应严格控制出厂水中氨氮的含量,降低饮用水中亚硝酸盐氮的含量,同时也在一定程度上降低管网中微生物的繁殖水平,进而对保障管网饮用水生物稳定性及管网饮用水的微生物学水质安全起到一定作用。

In order to study nitrogen compounds distribution and variation in drinking water distribution networks, detections were made on the parameters such as heterotrophic plate counts, NH4^＋-N, NO3^--N, NO2^--N, free chlorine, turbidity, total organic carbon （TOC）in a northern city distribution network of China. Results showed that the biological water quality of this area was poor. The concentration of NH4^＋-N and NO2^--N decreased with the extension of distribution networks. NH4^＋-N had negative correlation with NO3^--N. The concentration of NH4^＋-N should be controlled strictly, and it decreased the concentration of NO2^--N. At the same time it reduced bacterial growth in distribution networks, and maintained biological stabilization and security of drinking water biological water quality.