硝化作用发生在南加州的两个有盖成品水库中，从游离氯消毒改为氯胺消毒。自养氨氧化细菌的增殖被怀疑是原因。硝化事件造成的不良水质影响包括总氯和总氨氮残留量迅速下降，亚硝酸盐和异养平板细菌水平升高。因此，水库停止使用，并对断点进行氯化处理。本文研究了在含有氯胺化水的水库中导致硝化作用发展的条件，以及可用于控制该过程的措施。 包括39个参考文献、表格和图表。

Nitrification occurred in two covered finished-water reservoirs in Southern California following a change from free chlorine to chloramine disinfection. The proliferation of autotrophic ammoniaoxidizing bacteria was suspected to be the cause. Adverse water quality effects caused by the nitrification episodes included a rapid decline in the total chlorine and total ammonia-nitrogen residuals and elevated levels of nitrite and heterotrophic plate count bacteria. As a result, the reservoirs were taken out of service and break-point chlorinated. This article examines the conditions leading to the development of nitrification in reservoirs containing chloraminated water, along with the measures that can be used to control the process. Includes 39 references, tables, figures.