一个由新的球墨铸铁和铅管组成的管道回路系统运行了13个月至12个月 研究缓蚀剂对铅释放和细菌再生的影响。四管 使用缓蚀剂（正磷酸盐、聚磷酸盐、， 正磷酸盐/聚磷酸盐混合物，以及SnCl₂），其中一个用作未经处理的对照。烟斗 回路系统接收来自全规模石灰软化厂的处理过的地表水，并进行了测试 监测总铅、溶解铅、异养平板计数（HPC）和大肠菌群 浓度。各处理回路中的总铅浓度显著降低 （95%置信水平）高于未经治疗的对照组，以及正磷酸盐（1 mg/L为P） 在所有受试抑制剂中，铅浓度始终最低。然而 没有一种缓蚀剂能够始终将总铅浓度保持在以下 新铅中8小时停滞时间样品的15 mg/L最大污染物水平 用于本研究的管道。此外，所有含有磷酸盐的化学物质都会导致HPC 在温暖的夏季，浓度超过未经处理的控制回路中的浓度， 引起人们对再生和大肠菌群检测增加的可能性的担忧。相反地 在同一时期，SnCl₂回路中的HPC水平显著低于对照组。 微生物学结果表明，供水设施在添加 缓蚀剂，因此减少腐蚀不会以牺牲其他水质为代价 指标。包括12个参考文献、表格和图表。

A pipe loop system comprised of new ductile iron and lead pipes was operated for 13 months to investigate the effects of corrosion inhibitors on lead release and bacterial regrowth. Four pipe loops were treated with a corrosion inhibitor (orthophosphate, polyphosphate, orthophosphate/polyphosphate blend, and SnCl₂) and one served as an untreated control. The pipe loop system received treated surface water from a full-scale lime softening plant and was monitored for total lead, dissolved lead, heterotrophic plate count (HPC), and coliform concentrations. Total lead concentrations in each of the treated loops were significantly lower (95% confidence level) than in the untreated control, and orthophosphate (1 mg/L as P) consistently yielded the lowest lead concentrations of all of the inhibitors tested. Nevertheless, none of the corrosion inhibitors was able to consistently maintain total lead concentrations below the 15 mg/L maximum contaminant level for the 8-hour stagnation time sample in the new lead pipes used for this study. In addition, all of the phosphate-containing chemicals caused HPC concentrations to exceed those in the untreated control loop during the warm summer months, raising concerns about regrowth and the potential for increased coliform detections. Conversely, HPC levels in the SnCl₂ loop were significantly lower than in the control during the same period. The microbiological results suggest that water utilities need to exercise caution when adding corrosion inhibitors, so that reduced corrosion is not achieved at the expense of other water quality indicators. Includes 12 references, tables, figures.