给水管网中铁释放现象的影响因素研究

Effect on Iron Release in Drinking Water Distribution Systems

在实验室静态试验下,定量分析了给水管网中无机化学水质参数对铁释放现象的影响,包括酸碱条件、氧化还原条件和无机离子等不同类别的水质参数.研究发现,铁释放速率都随着pH值、碱度和氧化剂浓度的升高而降低,随着氯离子浓度的升高而升高.根据管网的一般条件,提出了控制铁释放现象的理论临界释放速率计算公式.根据理论临界铁释放速率,达到控制管网铁释放现象的必要条件时,管网水质条件满足的要求为pH大于7.6,碱度大于150 mg/L,溶解氧浓度大于2 mg/L,氯离子浓度小于150 mg/L.

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.