摘要
以北方某城市区域管网为研究对象,考察了该区域管网管材分布情况及氯胺消毒水的水质变化特征.结果显示,该区域管网水质稳定,二次消毒剂氯胺衰减动力学符合氯胺自身降解的二级动力学过程,说明该区域干管输送过程对水质指标影响不大,红水现象主要来自于户线管网.通过旧管道输水模拟实验,对该市因变更水源导致红水现象的过程和机理进行了分析,结果表明,氯胺对铁管材的腐蚀性比氯更强,更能导致金属的溶出;原水中硫酸盐升高能加剧水质对管道的腐蚀性.XRD分析表明,发生过红水的管道α-FeOOH的含量较少,β,γ-FeOOH的含量大于α-FeOOH;而没有发生过红水的管道α-FeOOH含量明显大于β,γ-FeOOH,α-FeOOH可能是铁质管道内壁形成致密保护层从而保持水质稳定的主要成分.
This paper systematically studied the water quality changes of the regional distribution system influenced by pipe materials and chloramination disinfection in a northern city in China. The results showed that the water quality of the regional distribution system was stable, and the rate of chloramine decay followed the second order kinetics which was the same as the decay mode of chloramine itself in water. It indicated that the transmission process of regional distribution system had little influence on water quality. Through the old pipeline simulation experiments in laboratory, we analyzed the process and mechanism of red water phenomenon caused by the change of water source. The corrosivity of chloramine in iron pipe was stronger than chlorine, and chloramine increased the metal dissolution in raw water. The corrosivity of raw water would be enhanced when the concentration of sulfate was increased. Via XRD analysis, the pipeline in which red water phenomenon occurred in the pipeline where contained less α-FeOOH and moreβ,γ-FeOOH, while the opposite was true the red water phenomenon never occurred. It was supposed that α-FeOOH might be the main component of the dense protective layer formed on the inner wall of the iron pipe, which helped to maintain the stability of water quality.
作者
付军
周斌
滕曼
FU Jun ZHOU Bin TENG Man(Sino-Japan Friendship Centre for Environmental Protection, Beijing, 100029, China The Administrative Center for China＇s Agenda 21, Beijing, 100038, China China National Environmental Monitoring Center, Beijing, 100012, China)
出处
《环境化学》
CAS
CSCD
北大核心
2016年第12期2575-2581,共7页
Environmental Chemistry
基金
国家自然科学基金(51508582)资助~~
关键词
管网
红水
消毒
铁溶出
water distribution, red water, disinfection, iron release.
