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.
出处
《给水排水》
CSCD
北大核心
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)
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
Water distribution network
Unlined cast iron pipe
Iron release
Larson index
Dissolved oxygen
Chlorine residual
