摘要
由于具有强腐蚀性,海水淡化水在既有市政管网输配过程中往往会产生严重的"红水"现象,主要是由于管网中铁的释放.为了研究控制既有管网中铁释放的有效措施,对管龄为30～40 a的钢管和灰口铸铁管内壁的腐蚀瘤进行分析,主要组成物质为Fe3O4和FeOOH;选择腐蚀较严重的钢管进行静态浸泡试验,重点分析了自来水和淡化水的掺混比、pH值、碱度、氯离子和硫酸根离子对铁释放的影响,并以铁浓度为控制量,初步给出了海水淡化水在既有管网中安全输配所需满足的水质条件:自来水和淡化水的掺混比≥2∶1,pH值在7.6以上,碱度>200 mg.L-1.
Desalted water,with strong corrosion characteristics,would possibly lead to serious ＂red water＂ when transmitted and distributed in existing municipal water distribution network.The main reason for red water phenomenon is iron release in water pipes.In order to study the methods of controlling iron release in existing drinking water distribution pipe,tubercle analysis of steel pipe and cast iron pipe,which have served the distribution system for 30-40 years,was carried out,the main construction materials were Fe3O4 and FeOOH;and immersion experiments were carried in more corrosive pipes.Through changing mixing volume of tap water and desalted water,pH,alkalinity,chloride and sulfate,the influence of different water quality indexes on iron release were mainly analyzed.Meanwhile,based on controlling iron content,water quality conditions were established to meet with the safety distribution of desalted water： volume ratio of potable water and desalted water should be higher than or equal to 2,pH was higher than 7.6,alkalinity was higher than 200 mg·L-1.
出处
《环境科学》
EI
CAS
CSCD
北大核心
2012年第4期1216-1220,共5页
Environmental Science
基金
国家水体污染控制与治理科技重大专项(2009ZX07317-005)
关键词
海水淡化水
安全输配
铁释放
水质指标
钢管
浸泡试验
desalted water
safety transmitting
iron release
water quality indexes
steel pipe
immersion experiment
