对明尼苏达州圣保罗市的氯胺盐排水系统的生物稳定性和微生物质量进行了评估。全面监测的结果表明，系统中的水在生物学上是稳定的，尽管可同化有机碳（AOC）浓度适中，但系统中没有明显的微生物活性。该系统良好的生物稳定性和微生物质量可归因于多种因素，包括使用单氯胺作为终端消毒剂、系统中的高余氯以及一年中大部分时间的低水温。进行了批量试验，以检查消毒剂残留物对维持系统的生物稳定性和微生物质量的重要性。包括12个参考文献、图表。

The biostability and microbiological quality in the full-scale chloraminateddrinking water distribution system of the City of St. Paul, Minnesota, wereevaluated. Results from full-scale monitoring demonstrated that the water in thesystem was biologically stable and that there was no significant microbialactivity in the system despite a moderate assimilable organic carbon (AOC)concentration. The excellent biostability and microbiological quality of thesystem could be attributed to a combination of factors including the use ofmonochloramine as terminal disinfectant, high residual chlorine in the system,and low water temperature for much of the year. A batch experiment was conductedto examine the importance of a disinfectant residual to maintaining thebiostability and microbiological quality of the system. Includes 12 references, figures.