对55个常规处理厂的原水和成品水样中的微生物群和总颗粒物浓度进行了比较。分析包括:微生物群的计数和鉴定；实验室离心后直接测量总颗粒的颗粒体积；颗粒总数；以及贾第虫和隐孢子虫的检测。根据原水和成品水中的微观颗粒分析，有机物减少的范围为-0.8至6.0 log。生物体计数、离心颗粒测量和颗粒计数产生的还原值之间存在显著相关性。 然而，无论进水浊度或出水中存在的絮状物如何，只有有机物还原值保持一致。由于浓度低且间歇性发生，贾第虫和隐孢子虫的计数不能准确反映处理厂的性能。包括42个参考文献、表格和图表。

The concentration of microbiota and total particulates in raw and finished water samples from 55 conventional treatment plants was compared. Analyses included: enumeration and identification of the microbiota; direct measurement of the pellet volume of total particulates after laboratory centrifugation; total particle counts; and, Giardia and Cryptosporidium detection. Organism reduction based on microscopic particulate analysis in the raw and finished waters ranged from -0.8 to 6.0 log. There was a significant correlation between reduction values generated by organism counts, centrifugate pellet measurements, and particle counts. However, only organism reduction values remained consistent regardless of influent turbidity or flocculent material present in the effluent. Because of low concentrations and intermittent occurrence, counts of Giardia and Cryptosporidium did not accurately reflect treatment plant performance. Includes 42 references, table, figures.