为了更好地控制消毒副产物（DBPs）的形成，美国 环境保护局最近颁布的消毒剂/DBP规则要求 美国地表水处理厂的进水和出水符合一定的水质标准 标准实施强化凝血。虽然这种治疗技术已经被证明 为了有效地减少天然有机物，从而减少DBPs，人们提出了一些问题 关于其对水处理其他方面的影响，如颗粒和 去除病原体。目前的研究是为了调查降低死亡率的影响 去除废水时的混凝pH值（强化混凝的一个组成部分） 隐孢子虫卵囊以及降低总有机碳（TOC）、浊度和 粒子计数。进行了一系列中试试验，其中 在不同的pH值下使用混凝剂（三氯化铁、明矾和聚合氯化铝） 用于处理河水的水平含有大量隐孢子虫卵囊。 结果 结果表明，在较低的pH水平下进行混凝，TOC的去除显著增强，并且 这三种凝固剂都能有效去除隐孢子虫卵囊 常规处理（平均去除率=4.3对数单位）。然而，浊度和颗粒物 计数似乎是去除卵囊的不可靠指标。最后是调查 表明降低凝固pH值不会干扰隐孢子虫的去除。 然而，关于在pH值为5时使用明矾的问题仍然存在。 包括22个参考文献、表格和图表。

In an effort to better control formation of disinfection byproducts (DBPs), the US Environmental Protection Agency's recently promulgated Disinfectants/DBP Rule requires that US surface water treatment plants whose influent and effluent waters meet certain criteria practice enhanced coagulation. Although this treatment technique has been shown to effectively reduce natural organic matter, and consequently DBPs, questions have been raised concerning its effect on other aspects of water treatment such as particle and pathogen removal. The current study was designed to investigate the influence of decreased coagulation pH levels (an integral component of enhanced coagulation) on removal of Cryptosporidium oocysts as well as on reduction of total organic carbon (TOC), turbidity, and particle counts. A series of pilot-plant trials was conducted in which commonly used coagulants (ferric chloride, alum, and polyaluminum chloride) were used at various pH levels to treat river water spiked with large numbers of Cryptosporidium oocysts. The results showed that TOC removal is significantly enhanced by coagulation at lower pH levels and that all three coagulants are effective in removing Cryptosporidium oocysts during conventional treatment (mean removal = 4.3 log units). However, turbidity and particle counts appear to be unreliable indicators of oocyst removal. Finally, the investigation suggested that lowering coagulation pH does not interfere with removal of Cryptosporidium. However, questions remain concerning the use of alum at pH 5. Includes 22 references, table, figures.