Figure 7-15
Indexing grid sludge scraper.
Figure 7-16
ACTIFLO ballasted sedimentation process for water treatment. (Courtesy of Kruger Inc.)
second stage. These flocculate with the preformed turbidity floc. After flocculation, the ballasted floc is settled in a high-rate settler, and the sludge is pumped to a hydro cyclone where the microsand is recovered for reuse.