近年来，人们对废水循环利用的兴趣不断增加，例如废过滤器反洗和其他处理厂废水。在干旱地区，废物流的回收通常被认为是良好的水管理和成本效益。对于位于水库或湖泊附近的设施，将反冲洗水和沉淀污泥返回原水源的做法可能会导致泥沙堆积，并因这些未经处理的废水流中的污染物而导致水源退化。因此，这些设施可以考虑回收，以保护它们的来源。由于对废物流中金属和其他污染物的关注程度越来越高，以及对污水处理厂的后续影响，目前要求或要求考虑其他处理方法的一些设施要考虑其他处理方法。 由于这些原因，废物流回收利用的趋势一直在增加。在所有情况下，都应进行研究，以确定如何在不中断处理过程或降低水质的情况下回收废物流。对污染物回收的日益关注，尤其是消毒副产品和囊肿，促进了对回收流使用和潜在废物流处理工艺的审查。由于人们对回收流及其对水质的潜在影响感兴趣，在北加利福尼亚州的三家传统水处理厂进行了几项研究，它们回收了不同类型的废物流。本文介绍了这些研究的初步结果。

Interest in the practice of recycling water such as spent filter backwash and other treatment plant waste streams has been increasing in recent years. In arid areas, the recycle of waste streams is often considered good water management as well as cost effective. For facilities located near reservoirs or lakes, the practice of returning backwash water and sedimentation sludge to the raw water source can result in silt buildup and source degradation due to contaminants in these untreated waste streams. Thus, these facilities may consider recycling in order to protect their source. Some facilities currently discharging waste streams to city sewers have been asked or required to consider other treatment methods due to increasing concerns about metals and other contaminants in the waste stream and their subsequent impact on wastewater treatment plant operations. For these reasons, the trend towards recycling waste streams has been increasing. In all cases, studies should be conducted to determine how to recycle waste streams without disrupting treatment processes or degrading water quality. Increased concern about contaminant recycle, especially with regards to disinfection byproducts and cysts, has promoted the review of recycle stream usage and potential waste stream treatment processes. Due to interest in recycle streams and their potential impact on water quality, several research studies were conducted at three conventional water treatment plants in Northern California which recycle different types of waste streams. This paper presents the preliminary findings of these studies.