本研究旨在确定和评估可行的处理方案，以便在将循环水流重新引入水处理厂渠首之前，从循环水流中去除病原体和其他污染物。研究工作集中在废过滤器反冲洗水（SFBW）上，因为它是水处理厂产生的侧流废物中体积最大的成分，也是迄今为止最常回收的侧流。该项目的最终目标是为公用事业公司和监管机构提供一个全面的指南，介绍有效、经济、实用的方法来处理回收的SFBW。实现这一目标的方法包括进行以下研究: 发生调查（原生动物和其他参数）；消毒研究；实验室清除研究；溶解气浮（DAF）中试试验；中试和全规模沉淀试验（包括中试规模的卵子培养）；以及使用合成纤维过滤器进行常规处理和过滤的中试规模比较。这些调查的结果用于确定与回收处理水平相关的成本。本文主要研究如下:实验室去除研究；DAF试验；以及中试和全尺寸沉降试验。包括6个参考文献、表格、图表。

This study was conducted to identify and evaluate viable treatment options forremoving pathogens and other contaminants from recycle streams beforereintroducing the streams to the headworks of a water treatment plant. Researchefforts were focused on spent filter backwash water (SFBW) since it comprises thelargest component by volume of the sidestream wastes generated at a watertreatment plant and is by far the most commonly recycled sidestream. The ultimateobjective of this project was to provide utilities and regulators with a thoroughguide on effective, affordable, and practical methods to treat recycled SFBW. Theapproach for achieving that objective involved conducting the following studies:occurrence survey (protozoans and other parameters); disinfection studies;laboratory removal studies; pilot-scale dissolved air flotation (DAF) trial;pilot- and full-scale sedimentation trials (including pilot-scale oocystspiking); and pilot-scale comparison of conventional treatment and filtrationusing a synthetic fiber filter. Results of these investigations were used todevelop costs relative to the level of recycle treatment. This paper addressesthe following studies: laboratory removal studies; pilot-scale DAF trial; andpilot- and full-scale sedimentation trials. Includes 6 references, tables, figures.