作者描述了一个可以 用于解释估算所需成本时的误差 氯胺浓度乘以失活时间（C？T） 含臭氧的隐孢子虫卵囊 饮用水中的氯胺。安全系数 文章中描述的可用于判断 所需的C？T考虑到特定的已知 不确定性。事实上，很多人的需求并不完全相同 当安全等级为C时，应考虑哪些因素？T是 计算因为批次可变性是在 当前长期2强化地表水处理 根据规定，供水公司可能会使用类似的方法 一种顺序失活方法的因素 考虑了很多变化。这项研究表明 臭氧和氯胺的顺序应用是一个很好的选择 有希望替代臭氧或臭氧的单一应用 氯胺控制饮用水中微小隐球菌卵囊 水自来水公司可以计算出所需的C？T 用于二次消毒剂，以达到规定的消毒效果 微小假丝酵母菌卵囊失活水平。包括10个参考文献、表格和图表。

The author describes a statistical model that can be used to account for the error in estimating the required chloramine concentration times time (C?T) to inactivate Cryptosporidium oocysts with ozone followed by chloramine in drinking water. The safety factor described in the article can be used to determine whether the required C?T takes account of specific known uncertainties. The fact that lots are not all identical needs to be accounted for when the safety level of C?T is calculated. Because lot variability is accounted for in the current Long Term 2 Enhanced Surface Water Treatment Rule, water utilities may want to use a similar factor for a sequential inactivation approach that also takes lot variability into account. This study shows that a sequential application of ozone and chloramine is a promising alternative to a single application of ozone or chloramine to control C. parvum oocysts in drinking water. Water utilities can calculate the required C?T for the secondary disinfectant in order to achieve a specified inactivation level of C. parvum oocysts. Includes 10 references, tables, figures.