哥伦比亚特区水和下水道管理局（DCWASA）采购和 向超过120000户居民、企业和政府部门分配氯胺化水 建筑。硝化作用是氨转化为亚硝酸盐和硝酸盐的过程 用于氯胺化系统。本文描述了多种水资源之间的关系 WASA分配系统中的质量参数和亚硝酸盐形成。 2000年11月，消毒由游离氯改为氯胺。2003年， 由于水化学的变化，DCWASA的铅含量增加， 特别是水的氧化电位。2004年，正磷酸盐被添加到 用于腐蚀控制的处理厂。自2000年更换消毒剂以来 渡槽（DCWASA的批发商）将消毒从氯胺改为免费 氯，或“氯燃烧”，每年春天。担心对铅的影响 腐蚀、渡槽、DCWASA和其他采购公用设施同意不执行 2005年的一次氯气燃烧。 硝化作用是氯胺化系统的一个问题，如果没有氯气燃烧，它会 成为夏季几个月的主要问题。DCWASA分析了水质 用于确定硝化指标和制定操作控制水平的数据。 DCWASA还知道前几天发生硝化作用的一所学校 十一月DCWASA密切监视该场地，一旦硝化作用开始， 研究了冲洗的效果。本文描述了对数据进行的分析 确定硝化指标及其警告和行动水平。包括3个参考文献、图表。

The District of Columbia Water and Sewer Authority (DCWASA) purchases and distributes chloraminated water to over 120,000 residences, businesses, and governmental buildings. Nitrification, the conversion of ammonia to nitrite and nitrate, is a concern for chloraminated systems. This paper describes relationships between multiple water quality parameters and nitrite formation in the WASA distribution system. In November 2000, the disinfection changed from free chlorine to chloramines. In 2003, DCWASA experienced increased lead levels due to the change in water chemistry, particularly the oxidation potential of the water. In 2004, orthophosphate was added at the treatment plants for corrosion control. Since the disinfectant change in 2000, the Aqueduct (DCWASA's wholesaler) switched disinfection from chloramines to free chlorine, or "chlorine burn," in the spring each year. Concerned for the effects on lead corrosion, the Aqueduct, DCWASA, and other purchasing utilities agreed to not perform a chlorine burn in 2005. Nitrification is a concern for chloraminated systems and without a chlorine burn, it became a primary concern for the summer months. DCWASA analyzed water quality data to identify indicators for nitrification and develop operational control levels. DCWASA was also aware of a school where nitrification occurred the previous November. DCWASA closely monitored this site and once nitrification started, researched the effects of flushing. This paper describes the data analysis conducted to identify nitrification indicators and their warning and action levels. Includes 3 references, figures.