AWWA JAW31525 ✓ Most Recent

Bench-scale and pilot-plant studies were used to investigate the effects of flocculation time and floc size on the performance of dissolved air flotation and to determine air requirement for three different types of water supplies. The results show that long flocculation periods are not needed and suggest that floc particles of 10-30 um should be prepared for flotation. Two measures of the air supplied were examined: percentage recycle and the bubble volume concentration or the volume of air released per volume of water treated. Bubble volume concentrations of 4,600 ppm or 8 percent recycle were sufficient to effectively treat all the waters tested. Includes 24 references, tables, figures. See more