Larson指数、溶解氧和余氯浓度变化对管网铁释放的影响  

Influence of Larson index,dissolved oxygen and residual chlorine on ferric iron releasing in pipe network

作　　者：牛铁柱 徐强[1,2] 陈求稳[1,3] 顾军农 石宝友[1,2] 

机构地区：[1]中国科学院生态环境研究中心,北京100085 [2]中国科学院饮用水科学与技术重点实验室,北京100085 [3]南京水利科学研究院生态环境研究中心,南京210029 [4]北京市自来水集团,北京100031

出　　处：《给水排水》2015年第3期148-153,共6页Water & Wastewater Engineering

基　　金：国家自然科学基金项目(51309216);国家水体污染控制与治理科技重大专项(2012ZX07408-002)

摘　　要：不同水质水源的更换可能会引起饮用水中铁含量超标。通过静态试验,分析了Larson指数变化对无内衬灰口铸铁管铁释放的影响,同时探讨了铁释放速率随溶解氧和余氯衰减的变化规律。研究结果表明,Larson指数是影响无内衬灰口铸铁管铁释放速率的重要因素,铁释放速率与Larson指数呈显著正相关,与溶解氧和余氯呈负相关,且在24h停留时间内,溶解氧和余氯呈现简单一级衰减规律,衰减系数随着Larson指数的增大而增大。Switch of different water sources would often cause excessive iron release in drinking water. Experiments were carried out in laboratory to investigate the dependence of iron release in water distribution systems on the changes of Larson index for unlined cast iron pipe. And the decay of dissolved oxygen and chlorine residual were discussed too. The results showed that Larson ratio was an important factor influencing the iron release in unlined cast iron pipe. The iron release rate had a significant positive relationship with Larson index, and negative relationships with the concentrations of dissolved oxygen and chlorine residual were found. Meanwhile, the decay of dissolved oxygen and chlorine residual followed the first-order kinematic dynamics in a 24 h retention period, and the decay coefficients increased with Larson index.

关 键 词：给水管网 无内衬灰口铸铁管 铁释放 Larson指数 溶解氧 余氯 

分 类 号：TU991.33[建筑科学—市政工程]