尽管溶解空气浮选（DAF）在欧洲已经使用了20多年，但在北美却是一项相对较新的技术。DAF不仅被认为是沉淀装置的替代品，而且被认为是改善过滤效果的澄清方法。DAF前的絮凝池通常设计为两个阶段，总停留时间为20-30分钟。本研究的主要目的是调查DAF前的絮凝步骤，包括检查混凝剂类型、絮凝时间、絮凝阶段、絮凝混合器和絮凝混合强度对浮选和过滤性能的影响。在所研究的所有预处理絮凝条件下，均观察到良好的溶解气浮和过滤性能。研究表明，DAF装置的絮凝时间可低至5分钟，并且DAF是一种强大的颗粒去除工艺- -i、 例如，它可以在各种条件下产生持续良好的水质。包括8个参考文献、表格、图表。

Although dissolved air flotation (DAF) has been used in Europe for over 20 years, it is a relatively new technology in North America. DAF is considered not only an alternative to sedimentation plants but also a clarification method to improve filtration. Flocculation tanks prior to DAF are typically designed with two stages and a total detention time of 20-30 min. The primary purpose of this research was to investigate the flocculation step prior to DAF, including examining the effects of coagulant type, flocculation time, flocculation stages, flocculation mixers, and flocculation mixing intensity on flotation and filtration performance. Good dissolved air flotation and filtration performance were observed for all pretreatment flocculation conditions studied. The research showed that DAF plants can be designed with flocculation times as low as 5 minutes and that DAF is a robust particle removal process--i.e., it can produce consistently good water quality for a variety of conditions. Includes 8 references, tables, figures.