Dissolved air flotation (DAF) technology is one of the efficient techniques for purification of many types of wastewaters which contain pollutants less dense than water. Nowadays, due to high quality standards, wastewaters should be treated with high quality wastewater treatment techniques which meet the appropriate standards. DAF can remove suspended materials and oily particles contained in raw wastewaters. The study aims to review DAF system with its operation and limitations of the system. Additionally, the cost of system is discussed. Pretreatments of primary sedimentation and post treatments such as filtration, biological, and chemical treatments can enhance the removal of pollutants and efficiency of the system.
